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VROMANT, N., L. T. DUONG, and F. OLLEVIER. "Effect of fish on the yield and yield components of rice in integrated concurrent rice–fish systems." Journal of Agricultural Science 138, no. 1 (2002): 63–71. http://dx.doi.org/10.1017/s0021859601001642.
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Many authors report on the effect of rice–fish culture on rice yields. Some reports show increased rice yields, others show no effect or even decreased yields. To verify the impact of rice–fish culture, data gathered over eight experiments (1995–1999) at the Co Do experimental rice–fish station, Vietnam, were analysed through multiple regressions with rice yield and different yield components as the dependent variables. We used eight independent variables: season, water depth, rice variety, rice seeding rate, and the effective stocking density (ESD) of silver barb, Nile tilapia, common carp and snakeskin gourami. Season had the biggest impact on nearly all dependent variables. Rice yields in the wet season were on average 2·42 t/ha lower as compared to the dry season. Higher water levels decreased the number of panicles/m2 and the rice yield. The rice seeding rate affected the yield component variables, but had no impact on the rice yield. Silver barb feeding decreased the number of panicles/m2 but this was compensated by an increased number of grains/panicle. Snakeskin gourami had a positive effect on panicles/m2 and, together with common carp, on sink capacity, probably through improved nutrient cycling in presence of fish and improved nutrient uptake by the rice plant. Snakeskin gourami had a negative effect on the ripening ability, whereas Nile tilapia had a positive effect. Fish did not have any impact on the rice yield. Increased water level and reduced rice arable area, the main two requirements for rice–fish culture, result in lower rice yields from rice–fish systems as compared to monoculture systems.
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Loftus, D. H., C. H. Olver, E. H. Brown, P. J. Colby, W. L. Hartman, and D. H. Schupp. "Partitioning Potential Fish Yields from the Great Lakes." Canadian Journal of Fisheries and Aquatic Sciences 44, S2 (1987): s417—s424. http://dx.doi.org/10.1139/f87-343.
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We proposed and implemented procedures for partitioning future fish yields from the Great Lakes into taxonomic components. These projections are intended as guidelines for Great Lakes resource managers and scientists. Attainment of projected yields depends on restoration of stable fish communities containing some large piscivores that will use prey efficiently, continuation of control of the sea lamprey (Petromyzon marinus), and restoration of high-quality fish habitat. Because Great Lakes fish communities were harmonic before their collapse, we used their historic yield properties as part of the basis for projecting potential yields of rehabilitated communities. This use is qualified, however, because of possible inaccuracies in the wholly commercial yield data, the presence now of greatly expanded sport fisheries that affect yield composition and magnitude, and some possibly irreversible changes since the 1950s in the various fish communities themselves. We predict that total yields from Lakes Superior, Huron, and Ontario will be increased through rehabilitation, while those from Lakes Michigan and Erie will decline. Salmonines and coregonines will dominate future yields from the upper lakes. The Lake Erie fishery will continue to yield mostly rainbow smelt (Osmerus mordax), but the relative importance of percids, especially of walleye (Stizostedion vitreum vitreum), will increase. In Lake Ontario, yields of salmonines will be increased. Managers will have to apply the most rigorous management strictures to major predator species.
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Heino, Mikko. "Management of evolving fish stocks." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 8 (1998): 1971–82. http://dx.doi.org/10.1139/f98-089.
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Mortality caused by harvesting can select for life history changes in the harvested stock. Should this possibility be taken into account in the management of renewable resources? I compare the performance of different harvest strategies when evolutionary change is accounted for with the help of an age-structured population dynamics model. Assuming that age of first reproduction is the only evolving trait, harvesting of only mature individuals selects for delayed maturation and results in increased sustainable yields. Unselective harvesting of both mature and immature fish selects for earlier maturation which causes the sustainable yield to decrease. Constant stock size and constant harvest rate strategies perform equally well in terms of maximum sustainable yield, both before and after evolutionary change. The maximum sustainable yield for fixed-quota strategies is lower. All those strategies have similar evolutionary consequences given a similar average harvest rate. Coevolutionary dynamics between fish stock and the stock manager indicate that the evolutionary benefits of selective harvesting are attainable without incurring yield losses in the near future.
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Lamtane, H.A., Y.D. Mgaya, and R.G. Bailey. "Effects of water quality, flooding episode and management variables on the fish yield from self-stocked ponds in lower Rufiji floodplain, Tanzania." Greener Journal of Agricultural Sciences 3, no. 5 (2013): 320–31. https://doi.org/10.15580/GJAS.2013.5.022613494.
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A study was conducted to determine fish yields from flood depended ponds in Rufiji floodplain, Tanzania. Eight ponds were constructed during dry season in two sites besides two floodplain lakes, Ruwe and Uba. These ponds were self-stocked with different fish species from the lakes. More than eight species were trapped and<em>Oreochromis urolepis, Labeo congoro and Clarias</em> species were considered as good candidates for aquaculture. Other small fish species were harvested immediately after flood recession and the three key species were cultured for the maximum of seven months. However, other species in small quantities were remained in the ponds for the whole period of experiment. Water quality parameters were monitored throughout the study period. The relationships between water quality variables and flooding events were determined using canonical correspondence analysis (CCA). Other parameters included in the relationships were fish density, manure and number of species trapped and cultured. Dissolved oxygen and pH decreased with time in both sites. Fish yields were influenced by some water quality, flooding episode and other management variables. Chlorophyll-<em>a</em> was the only environmental variable that showed a significant correlation with fish yield (P< 0.01). Fish density and number of species trapped showed a significant effect on the fish yield (P<0.05). Re-connectivity between ponds and lakes was strongly positively correlated with yield. It can be concluded that some water quality variables, flooding and management parameters were responsible for the observed yield.
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Leach, J. H., L. M. Dickie, B. J. Shuter, U. Borgmann, J. Hyman, and W. Lysack. "A Review of Methods for Prediction of Potential Fish Production with Application to the Great Lakes and Lake Winnipeg." Canadian Journal of Fisheries and Aquatic Sciences 44, S2 (1987): s471—s485. http://dx.doi.org/10.1139/f87-348.
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Methods for estimating fish production in aquatic ecosystems range from simple empirically derived estimators, such as morphoedaphic indices, to complex ecosystem simulation models. As first-order estimators, the former are attractive to managers because they are simple and relatively inexpensive to apply and interpret. Application of the latter group has been limited because many of the data inputs are difficult and expensive to obtain. Between these extremes are several models, such as the biomass–size spectrum model, that provide useful information for moderate expenditures of time and effort. Existing and new methods are reviewed in the light of production theory and several are applied to Great Lakes and Lake Winnipeg data. Eight empirical models derived from limnological variables were selected from the literature and used to estimate potential fish yield for the Great Lakes and Lake Winnipeg. The models predicted a fairly narrow range of potential yields, but when compared with historic yields, none was consistent for all lakes. The best overall empirically derived estimator of potential yield in the Great Lakes was the morphoedaphic index. Potential fish production estimated from invertebrate production with Borgmann's biomass – size spectrum model was considerably greater than historic yields or the yield estimates from the empirical models. In a third approach, we calculated life history parameters for "small" and "large" fish in the Great Lakes and combined these with Borgmann's production model, empirical information on population production/biomass ratios from the literature, and classical population dynamics theory to estimate potential production and optimum sustained yield for each group. Historic sustained yield, as a percentage of optimum sustained yield, varied from a low of 6 for "small" Lake Ontario fish to 100 for "large" Lake Erie fish.
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Syandri, Hafrijal, Azrita Azrita, Eni Sumiarsih, and Elfiondri undefined. "Nutrient loading and farm characteristics of giant gourami fish aquaculture systems in Lake Maninjau, Indonesia: basic knowledge of production performance." F1000Research 10 (May 12, 2021): 378. http://dx.doi.org/10.12688/f1000research.52613.1.
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Background Aquaculture systems for giant gourami, Osphronemus goramy Lacepède (1801), have significantly improved fish production yields and food security in Indonesia. However, these systems also cause serious problems in terms of eutrophication in waterbodies. This study analysed the nutrient loading and farm characteristics of giant gourami in floating cages in Lake Maninjau. Method A total of 20 floating cages were used to record these nutrients in feed supply, female and male juvenile fish, dead fish and harvested fish to estimate nutrient loading. Data on the harvested fish, production cycle, stock number and cage capacity were used to estimate the stocking density, feeding rate, feed efficiency, and net fish yield, and the relationship between feed supply and nutrient loading and farm characteristics was analysed by least squares regression methods. Results A total of 20 floating cages released nutrients into waterbodies at an average rate of 236.27±60.44 kg/cycle for C, 84.52±20.86 kg/cycle for N and 8.70±3.63 kg/cycle for P. On average, fish production for each floating cage (±SD) was 1226±282 kg wet weight/cycle, and the net fish yield was 12.63±2.82 kg/m3/cycle. Survival rates ranged from 86.33 to 95.27%/cycle. The production cycles varied from 160 to 175 days with feed conversion ratios between 1.60 and 1.75, feed conversion efficiencies were between 0.58 and 0.63. The production parameters that had strong relationships with the net fish yield were feed supply (r2=0.960), stocking rates (r2=0.924) and feeding rates (r2=0.961). In contrast, the length of the production cycle was not strongly related to the net fish yield (r2=0.187). Conclusion Nutrient loading from the supplied feed was greater than that from the harvested fish, juvenile fish and dead fish. Increasing the net fish yield in floating cages was better predicted by the stocking densities and feeding levels than by the other factors.
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Syandri, Hafrijal, Azrita Azrita, Eni Sumiarsih, and Elfiondri undefined. "Nutrient loading and farm characteristics of giant gourami fish aquaculture systems in Lake Maninjau, Indonesia: basic knowledge of production performance." F1000Research 10 (September 22, 2021): 378. http://dx.doi.org/10.12688/f1000research.52613.2.
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Background Aquaculture systems for giant gourami, Osphronemus goramy Lacepède (1801), have significantly improved fish production yields and food security in Indonesia. However, these systems also cause serious problems in terms of eutrophication in waterbodies. This study analysed the nutrient loading and farm characteristics of giant gourami in floating cages in Lake Maninjau. Method A total of 20 floating cages were used to record these nutrients in feed supply, female and male juvenile fish, dead fish and harvested fish to estimate nutrient loading. Data on the harvested fish, production cycle, stock number and cage capacity were used to estimate the stocking density, feeding rate, feed efficiency, and net fish yield, and the relationship between feed supply and nutrient loading and farm characteristics was analysed by least squares regression methods. Results A total of 20 floating cages released nutrients into waterbodies at an average rate of 236.27±60.44 kg/cycle for C, 84.52±20.86 kg/cycle for N and 8.70±3.63 kg/cycle for P. On average, fish production for each floating cage (±SD) was 1226±282 kg wet weight/cycle, and the net fish yield was 12.63±2.82 kg/m3/cycle. Survival rates ranged from 86.33 to 95.27%/cycle. The production cycles varied from 160 to 175 days with feed conversion ratios between 1.60 and 1.75, feed conversion efficiencies were between 0.58 and 0.63. The production parameters that had strong relationships with the net fish yield were feed supply (r2=0.960), stocking rates (r2=0.924) and feeding rates (r2=0.961). In contrast, the length of the production cycle was not strongly related to the net fish yield (r2=0.187). Conclusion Nutrient loading from the supplied feed was greater than that from the harvested fish, juvenile fish and dead fish. Increasing the net fish yield in floating cages was better predicted by the stocking densities and feeding levels than by the other factors.
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Mchunu, Ntobeko, G. Lagerwall, and A. Senzanje. "Aquaponics production simulations using the decision-making tool." African Journal of Food, Agriculture, Nutrition and Development 22, no. 106 (2022): 19040–61. http://dx.doi.org/10.18697/ajfand.106.19860.
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Aquaponics have related food and nutrition security benefit that are important for this country (South Africa). The aim of this study was to apply aquaponics decision-making tool to provide potential aquaponics production data and information for South Africa. This study was designed as 2×3×3 factorial study giving 18 interactions. Because aquaponics are the production of fish and crops concurrently, yield production had two levels- fish and crop, fish stocking density had three levels- low, optimum and higher and aquaponics scale of production had 3 levels- hobby, subsistence and commercial scale. The summary of data of aquaponics variables from the literature was used as optimum level, lower and higher levels were based on experimental design. Yield production (kg) of both fish and plants increased significantly (p<0.05) as fish stocking density was increased. In hobby scale, plants yield was higher than fish yield in all levels of fish stocking density, the plant-fish yield (kg) was 40-33, 80-67 and 150-133, respectively. In subsistence scale, fish-plant yield (kg) was 240-200, 300-267 and 400-333, respectively. In commercial scale, fish-plant yield (kg) was 600-533, 1 100-1 000, 1 500-1 333, respectively. Daily fish feed increased significantly with increase in fish stocking density across all scale of aquaponics production (hobby<subsistence<commercial). In hobby scale, at low fish stocking, 0.65kg feed produced 1 kg fish, at optimum, 0.65kg feed produced 1 kg fish and at higher fish stocking, 0.37kg feed produced 1 kg fish. In subsistence scale at low fish stocking density, 0.38kg feed produced 1 kg fish, at optimum level, 0.63kg feed produced 1 kg fish and at higher level, 0.65kg feed produced 1 kg fish. In commercial scale, in low fish stocking, 0.64kg feed produced 1 kg fish, at optimum, 0.63kg feed produced 1 kg fish and at higher fish stocking, 0.64kg feed produced 1 kg fish. Plant culture have more yield output than fish culture in all aquaponics scale of production. Hobby scale produced the lowest yield than subsistence than commercial scale of production. Hobby scale practise could not produce sufficient yield to support human subsistence. Fish feed closely mirrored yield production. Lower fish stocking density maybe adopted in subsistence scale. Higher fish stocking density maybe adopted in commercial scale. Fish feed could become an economic sustainability constraint in aquaponics production, particularly in a developing country like South Africa. Water availability and quality effects on yield was not determine especially in African context. Key words: Fish stocking density, Yield production, Fish feed, Planting area
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Adepoju, Samuel Adebowale, Ibrahim Adewale Gbadegesin, Oluwaloni Peter Oluwanisola, and Adama Bola Saadu. "Effects of Fish Pond Sediment on Yield and Productivity of Two Varieties of Amaranths (Amaranthus spp.)." Journal of Agriculture, Aquaculture, and Animal Science 2, no. 1 (2025): 1–6. https://doi.org/10.69739/jaaas.v2i1.189.
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The rising costs of inorganic fertilizers have rendered them inaccessible to many farmers, resulting in reduced crop yields. An affordable alternative for enhancing soil fertility is the use of organic materials such as fish pond sediments. These sediments are nutrient-rich and have the potential to enhance soil quality, promote crop growth, and increase yields. This study examined the effect of fish pond sediments on the yield and productivity of two amaranth varieties. The research was conducted at the University of Ilorin Teaching and Research Farm. A 2x6 factorial experiment was employed using a Randomized Complete Block Design. The experiment included six sediment application rates: a control (no sediments) and sediment rates of 5, 10, 15, 20, and 25 Mg/ha, applied to two amaranth varieties (green leaf with Accession IDs NHAM 0116-1-2 and NHAM 0112-1-4). Yield and productivity parameters were assessed after 10 weeks. The findings revealed that fish pond sediment application significantly enhanced the yield of both amaranth varieties. The highest yield (51.36 Mg/ha), Chlorophyll A (1.64 mg/dm2), chlorophyll B (1.76 mg/dm2), and crude fibre content (12.18%) were recorded at the sediment application rate of 25 Mg/ha. The results demonstrate that fish pond sediments are a viable nutrient source for improving soil fertility and boosting the growth and yield of amaranths.
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TSURUTA, TETSUYA. "Effect of fish in rice-fish cultureon the rice yield." NIPPON SUISAN GAKKAISHI 78, no. 4 (2012): 654. http://dx.doi.org/10.2331/suisan.78.654.
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Downing, John A., Céline Plante, and Sophie Lalonde. "Fish Production Correlated with Primary Productivity, not the Morphoedaphic Index." Canadian Journal of Fisheries and Aquatic Sciences 47, no. 10 (1990): 1929–36. http://dx.doi.org/10.1139/f90-217.
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Estimates of the biological production of entire lake fish communities were collected from the published literature on lakes covering a wide range of geographic areas and trophic status. Correlation analysis shows that fish production is uncorrected with the morphoedaphic index (p > 0.05) but closely correlated with annual phytoplankton production (r2 = 0.79), mean total phosphorus concentration (r2 = 0.67), and annual average fish standing stock (r2 = 0.67). Empirically derived regression equations are presented and compared with previous models based on catch and yield data. Analysis of these equations suggests that conversion of phytoplankton into fish production is 100 times more efficient in oligotrophic lakes than hyper-eutrophic ones, but that a much lower fraction of fish production can be channeled to sustainable yield in oligotrophic lakes. Sustained yields were frequently as little as 10% of the annual community fish production.
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Ranta, Esa, and Kai Lindström. "Prediction of lake-specific fish yield." Fisheries Research 8, no. 2 (1989): 113–28. http://dx.doi.org/10.1016/0165-7836(89)90026-x.
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Brabec, Tomáš, Lucie Straková, Radovan Kopp, et al. "The influence intenzity of eutrophication on fishpond yield." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, no. 6 (2011): 53–62. http://dx.doi.org/10.11118/actaun201159060053.
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Fish ponds have been always built for purpose of fish farming and some additional functions. We evaluated fish farming operation (in years 1990–2007) on the Sykovec and Medlov pond in altitude 700 meters above sea level and Jaroslavický dolní pond in altitude 200 m. The samples for hydrochemical and hydrobiological analyses were taken regularly at monthly intervals in 2008. We chose some parameters as a total nitrogen (NT), total phosphor (PT), chlorophyll-a and chemical oxygen demand (COD) and structure of phytoplankton which has an impact on fish production. We compared our result with former research work from 1996–1997. Higher levels of monitored parameters have got a negative effect on spectrum of fish kind in managed fishponds.
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Tsuruta, Tetsuya, Motoyoshi Yamaguchi, Shin-ichiro Abe, and Kei’ichiro Iguchi. "Effect of fish in rice-fish culture on the rice yield." Fisheries Science 77, no. 1 (2010): 95–106. http://dx.doi.org/10.1007/s12562-010-0299-2.
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Li, Meijuan, Xiangyu Hu, Rui Hu, et al. "Evaluating Rice Varieties for Suitability in a Rice–Fish Co-Culture System Based on Lodging Resistance and Grain Yield." Agronomy 13, no. 9 (2023): 2392. http://dx.doi.org/10.3390/agronomy13092392.
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Rice–fish co-cultures have been practiced for over 2000 years, and they have tremendous potential in terms of increasing food security and economic benefits. However, little research has been conducted into achieving stable yields and high lodging resistance with regard to rice while simultaneously promoting the harmonious and healthy growth of fish in rice–fish co-culture paddy fields. We conducted a field study aimed at selecting suitable rice varieties for rice–fish co-culture systems (encompassing both ratoon and main crop). This selection process was grounded in an evaluation of lodging resistance and grain yield among 33 rice varieties used throughout the studied region. The results revealed a range of lodging indices of the main crop for the second internode, spanning from 62.43 to 138.75, and the annual grain yield (main crop and ratoon crop) ranged from 7.17 to 13.10 t ha−1 within rice–fish co-culture systems. We found that the use of rice–fish co-culture farming could improve the milling quality, nutrient quality, and appearance quality of rice, though the improvement gained through co-culturing varied across rice varieties. Moreover, the lodging index of the three basal internodes of rice plants was significantly and positively correlated with the plant height and the culm fresh weight, but it was negatively correlated with the bending strength of the rice basal internodes. Additionally, the 33 tested rice varieties were clustered in accordance with their lodging resistance (i.e., high resistance with lodging indices 62.43–75.42; medium resistance with lodging indices 80.57–104.62; and low resistance with lodging indices 113.02–138.75) according to the hierarchical cluster analysis. The 33 rice varieties were also clustered in accordance with the annual (main crop and ratoon crop) grain yield (i.e., high yield with 11.17–13.10 t ha−1; medium yield with 10.15–10.83 t ha−1; and low yield with 7.16–9.88 t ha−1). In all, 11 rice varieties were identified by a comprehensive evaluation as suitable varieties for grain production in the rice–fish co-culture system. These varieties displayed favorable traits, including a high annual rice yield, strong lodging resistance, and good grain quality. This is the first study to systematically evaluate rice varieties based on grain yield, lodging resistance, and grain quality in rice–fish co-culture systems.
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Mertz, G., and R. A. Myers. "A simplified formulation for fish production." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 2 (1998): 478–84. http://dx.doi.org/10.1139/f97-216.
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A new formulation for fish production is presented, one that clearly embodies the balance between aggregate somatic growth and losses due to natural and fishing mortality. The method permits simplified calculation of production over biomass and yield over production ratios; estimates of the latter can be used to investigate the reliability of yield as a proxy for production. Simple applications of the formulation indicate taxonomic variation in the yield to production ratio. Specifically, production is well approximated by yield for many piscivorous species, but yield seriously underestimates production for prey species.
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Triharyuni, Setiya, Aisyah Aisyah, Chairulwan Umar, and Husnah Husnah. "POTENTIALS YIELD AND FISHERIES OF MALAHAYU RESERVOIR, BREBES." Indonesian Fisheries Research Journal 25, no. 1 (2019): 11. http://dx.doi.org/10.15578/ifrj.25.1.2019.11-17.
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Fishing activity in Malahayu Reservoir has been done since long time. Unlimited fishing may impact to the decresing of fish resources of those waters. This study presents an assessment of fishing practices in Malahayu reservoir between 2008-2016 periods. Data of potential fish production and catch per unit effort were estimated by using different estimate models, catch per unit effort was analyzed annually, while potential fish production was analyzed by using five models namely model by Henderson & Welcome (1974), Teows & Griffith (1979), Marshal (1984), Moreau & De Silva (1991) and Crul (1992). The results show that changes of fish composition has accured, which was originally dominated by native fish while for now it is dominated by 72,05% of tilapia (Oreochromis niloticus) as an introduced fish. Furthermore, the average catch per unit effort (CPUE) in Malahayu reservoir is about 11,82 kg / fisherman, while the average potential production is about 198,55 kg / year. CPUE value and potential production indicate that exploitation rate in Malahayu Reservoir are in fully-exploited or perhaps over-exploited condition. Related to those conditions, not to increase the number of efforts (fishermen) as a management option towards sustainable fisheries.
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Suleiman, Nazeef, Idris Ado Yola, and Ibrahim Muhammad Ahmed. "Relative Yield Indices of Challawa Gorge Dam, Kano State, Nigeria." Greener Journal of Biological Sciences 7, no. 6 (2017): 60–62. https://doi.org/10.15580/GJBS.2017.6.111817167.
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Reservoir morpho-metrics and ionic input of Challawa dam, Kano State (Nigeria) were applied to estimate the potential fish yield using morpho-edaphic index (MEI). Physico-chemical parameters of the reservoir were sampled monthly from three stations (Feginma, Sakarma, and Turawa) for the period of six months (March to August, 2017) using standard methods. Potential fish yield estimates of the three sites were determined using the values of the Physico-chemical characteristics of the reservoir with the relationship Y=23.281 MEI <sup>0.447</sup>, where Y is the potential fish yield in Kg/ha, MEI is Morphoedaphic index (given in µS/cm) which was obtained by dividing mean conductivity of the reservoir by mean depth. The potential fish yield estimates of the three sites are 88.05, 98.56 and 111.12 Kg/ha. The relative yield index (RYI) which is the ratio of estimated yield with angler harvest, was determined using the relationship RYI= Y<sub>obs</sub>/Y<sub>est</sub> ×0.75, where Y<sub>est</sub> is estimated potential yield in kg/ha and Y<sub>obs</sub> is anglers harvest in Kg. The anglers were 53.3, 65.7 and 57.05 Kg respectfully, which implied that the relative yield indices were 44.5%, 49.9% and 38.5%. The results of this study showed that, the reservoir’s exploitation level was moderate (RYI≤1). Good ionic content, good dissolved oxygen levels, good pH, low-levels of pollution, accounted for the high estimates of the fish yield. Therefore effective management system, implementation of good fishing regulations and practices should be implemented.
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van Denderen, P. Daniel, Tobias van Kooten, and Adriaan D. Rijnsdorp. "When does fishing lead to more fish? Community consequences of bottom trawl fisheries in demersal food webs." Proceedings of the Royal Society B: Biological Sciences 280, no. 1769 (2013): 20131883. http://dx.doi.org/10.1098/rspb.2013.1883.
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Bottom trawls are a globally used fishing gear that physically disturb the seabed and kill non-target organisms, including those that are food for the targeted fish species. There are indications that ensuing changes to the benthic invertebrate community may increase the availability of food and promote growth and even fisheries yield of target fish species. If and how this occurs is the subject of ongoing debate, with evidence both in favour and against. We model the effects of trawling on a simple ecosystem of benthivorous fish and two food populations (benthos), susceptible and resistant to trawling. We show that the ecosystem response to trawling depends on whether the abundance of benthos is top-down or bottom-up controlled. Fishing may result in higher fish abundance, higher (maximum sustainable) yield and increased persistence of fish when the benthos which is the best-quality fish food is also more resistant to trawling. These positive effects occur in bottom-up controlled systems and systems with limited impact of fish feeding on benthos, resembling bottom-up control. Fishing leads to lower yields and fish persistence in all configurations where susceptible benthos are more profitable prey. Our results highlight the importance of mechanistic ecosystem knowledge as a requirement for successful management.
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Elvina, Wica, and Risnita Tri Utami. "Kajian Potensi Pemanfaatan Limbah Sisik Ikan Dari Usaha Ikan Tangkap Laut (Studi Kasus Pasar Kota Bengkulu)." MANFISH JOURNAL 2, no. 3 (2022): 151–58. http://dx.doi.org/10.31573/manfish.v2i3.468.
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The potential utilization of fish by-products from fishery processing businesses in the form of fish scales can still be utilized for various synthetic products. Fish scales contain 29.8 – 40.9% protein; fat content 0.1-1%, mineral content 30.0-36.8%, collagen 37.5%, with the content of these protein compounds, fish scales can produce active compounds such as chitosan, collagen and gelatin. Bengkulu City is an area that has a major contribution to the province Bengkulu, with a total production of 46,145 tons of marine catch per year (KKP, 2020). This research aims to determine the potential of fish scales produced from fish processing activities in Bengkulu City based on the yield of fish scales per total weight of fish. Snapper, grouper and pomfret are the three types of marine capture fisheries could produce the highest production volume in Bengkulu City. Based on the research conducted, it was found that the yield of snapper scales resulted in the highest yield of fish scales, was 5.2% per total weight, with the results of the yield, it was known that fish scales could be utilized and potentially reprocessed into new products. The results of interviews with fish processing entrepreneurs in one of the largest markets in Bengkulu City (Panorama Market), it is known that every day the fishery product processing can produce 20-50 kg of snapper, so if this related to the yield of fish scales with the amount of fish production, it is known that Snapper scales have high potential to be used to provide additional income for fisheries entrepreneurs. The fish scale waste obtained can be reprocessed into useful products such as gelatin, chitosan, and collagen. Gelatin is used as a food additive, chitosan is used as a natural preservative, and collagen is used as an additive in food or pharmaceutical products.
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Pattipeilohy, Fredy, and Angcivioletta Moniharapon. "UTILIZING OF DARK MEAT TUNA FISH (Thunnus sp. ) AND TRASH FISH SURIMI IN THE PROCESSING OF FISH BURGER." KnE Life Sciences 2, no. 1 (2015): 53. http://dx.doi.org/10.18502/kls.v1i0.86.
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Trash fish as by-catch includes a wide variety of species caught in shrimp fishing and usually is under utilizied while produced in a great number. Weakness of trash fish are small in measure with bone system, big husk and scale which resulting amount of yield flesh to be utilized relative small. So that, in processing a product require addition of order fish flesh. The objectives of this research were to study the amount of yield of minced fish that can utilizied for fish burger, quality and calory value of the product, and the level of panelists acceptance. Fish burger made from trash fish, used 2 (two) species as gulamah / Silver Pennah Croaker (Argyrosomus amoyensis), senangin / Fourfinger Threadfin (Elentheroma tetradactylum), and dark meat of Tuna (Thunnus sp). Minced fish of these two species was mixed with tuna flesh by ratio 1:1 (gulamah tuna) (A1), 1:2 (senangin tuna) (A2), 1:3 (gulamah tuna) (A3), 1:4 (senangin tuna) (A4), trash minced fish (gulamah senangin) (A5) and dark meat tuna minced fish (A6) as control. Research design applied was Complete Randomized Design with 4 replications. The result showed that amount of yield of minced fish are 47.8 % gulamah), 33.9 % (senangin) and 4.4 % (dark meat of tuna). The quality of fish burger products water content 46.00-53.93 %, protein content 12.78- 20.84%, fat content 12.83-19.52%, ash content 2.32-3.33%, and carbohydrate content 11.61- 17.36% (by-difference). Calory value 253.8-286.9 kcal. Sensory/orgaoleptic test value of this product is 7,04. – 7,93 (aspire). Treatment of minced of gulamah mixed with tuna 1:3 (A3), the fish burger with the best quality as it was by indicated by the water content 50.22%, protein content 20.84% and fat content 12.83%. Keywords : Dark meat tuna, trash fish, minced fish, amount of yield, fish burger
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Mafimisebi, T. E. "Yield performance of commercialized upland fish farms in Ondo state of Nigeria." Nigerian Journal of Animal Production 30, no. 2 (2021): 217–28. http://dx.doi.org/10.51791/njap.v30i2.1489.
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The study examined the socio-demographic characteristics of fish farmers, evaluated the profitability of upland fish farms in the study area and determined the key variables to which profitability is responsive. Empirical results showed the majority of the fish farms came into business less than ten years ago while 62.0% of the managers of the fish farm had formal education. The total farm size of the twenty-two fish farms surveyed was 229,112m2 and the average size of a fish pond unit was 1.863m2. Table fish production was preponderant over fingerlings production. About 70.0% of the fish farms practised monoculture, 23.33%used polycultural method and 6.67% employed both. The major fish species commonly cultivated were Tilapia, Alextes, Heterotis and Catfish. The fixed cost per hectare of fish farm for the period studied was ₦517,591.48 while variable cost stood a 2,053906.68. The most important components of fixed costs were labor (41.02%), bore-hole and water pumps (22.10%.) and land and pond construction (14.5%). For variable cost the most expensive items were fish feeds (51.44%). fish seeds (17.30%) and transportation and fuel (13.16%). The average profit per hectare of fish farm was ₦960,037.57 per year. Various profitability ratios revealed that investment in uppland fish farms is a worthwhile business but investor's need to do something about the fluctuating trends of some of the indices since the desirable trend is either a consistent increase or decrease. A sensitivity analysis carried out showed that profitability is more responsive to the unit price of fish compared with cost of inputs. The NPV, B/C and IRR were ₦1,571,710.15, 1.53 and 52.4% respectively. The three indicators attest to the fact that fish culture is very profitable in the study area. It is recommended that the various governments make access to Iand and investible funds at affordable rates a priority in the study area. There is also the need for the establishment of a modern hatchery which will supply fingerlings to fish farmers at subsidized rates.
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Lyach, Roman. "Fisheries Management of the European Catfish Silurus glanis Is Strongly Correlated to the Management of Non-Native Fish Species (Common Carp Cyprinus carpio, Rainbow Trout Oncorhynchus mykiss, and Grass Carp Ctenopharyngodon idella)." Sustainability 14, no. 10 (2022): 6001. http://dx.doi.org/10.3390/su14106001.
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Intensive multi-species fish stocking management is a popular yield enhancement tool that supposedly leads to elevated yields in recreational angling. This study aimed to analyze the relationships between fisheries management of an apex predator and its putative prey. The GAM (generalized additive model) was used to analyze the relationships between the yields and the stocking intensities of European catfish and non-native fish species. The fish yields and stocking intensities were obtained from mandatory angling logbooks collected from 38,000 individual recreational anglers by the Czech Fishing Union on 176 fishing sites during the years 2005–2017 in central Bohemia and Prague (the Czech Republic). Our results show that the stocking intensities of the targeted species positively correlated to their yields. However, intensive catfish stocking negatively correlated to the yields of the non-native fishes. Other factors that were strongly correlated to the yields include the angling effort, size of a fishery, and yield of catfish. In conclusion, a significant relationship is found between the fisheries management of a predator and its putative prey. The results suggest that catfish should not be intensively stocked in the same rivers as non-native fishes.
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Dali, M., N. C. Soleiman, and A. Saad Saad. "The effect of irrigation with fish pond waste water on the quality and yield of tomato under green houses." Iraqi Journal of Aquaculture 8, no. 1 (2022): 39–52. http://dx.doi.org/10.58629/ijaq.v8i1.228.
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This study was carried out during the seasons of 2008_2009 to study effect of irrigation with fish culture effluent on quality and Lycopersicum esculentum (under green house) yield of tomato. The experiment consisted of four treatments: Irrigation with freshwater. (control), irrigation with fish culture effluent, irrigation alternately with fish culture effluent twice and freshwater once, irrigation alternately with fish culture effluent once and freshwater once. The experiment was done according to the completely randomized block design with four replicates. Soil and water samples were collected and analyzed. Results of the study showed: The irrigation in waste water fish ponds adds positive effect on quality and yield of Tomato under green house. This effect of water was on the irrigation with fishculture effluent increase the yield 17.82 Kg/m2 firstly followed by the treatment of irrigation alternately with fish culture effluent twice and freshwater once by yielding 15.47 Kg/m2. After that it was on irrigation alternately with fish culture effluent once and freshwater once by yielding 12.42 Kg/m2 comparing with-irrigation of freshwater. Which give lower yield 8.88 Kg/m2.
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Huli, La Ode, Sugeng Heri Suseno, and Joko Santoso. "Fish oil quality of by-product (fish skin) from swangi fish." Jurnal Pengolahan Hasil Perikanan Indonesia 17, no. 3 (2015): 232. http://dx.doi.org/10.17844/jphpi.v17i3.8912.
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The skin of swangi fish is a potential fish skin to be produced for fish oil. The objectives of this research were aimed to determine the yield and the best quality of fish oil and also to compare fatty acid profile of the fish according to different extraction methods. Fish oil extractions were used by wet rendering method with extraction temperatures of 60, 70, 80, 90, 100°C for 20, 30, and 40 minutes. Fish oil quality was determined by the chemical oil characteristics i.e. PV, FFA, AV, anisidin, and TOTOX. Fatty acid profile was analyzed using gas chromatography (Shimadzu). The results of the study showed that the highest fish oil yield in each treatment was obtained extraction temperature of 60°C for 30 minutes with percentage of 0.33, (70°C for 30 minutes) 0.46, (80°C for 30 minutes) 1.23, (90°C for 20 minutes) 1.14 and (100°C for 20 minutes) 0.84. These values were lower compare to Bligh &amp; Dyer and Soxhlet methods. Then, the best fish oil quality was resulted on temperature extraction of 60°C for 30 minutes with PV, FFA, anisidin, AV, and TOTOX were 9.17 meq/kg, 6.92%, 13,77 mg KOH/g, 0.86 meq/kg and 19.19 meq/kg, respectively. FUFA fatty acid compositions of swangi skin fish oil especially EPA and DHA in wet rendering method were gained 0.73% and 2.53%, respectively. These results were lower than Bligh &amp; Dyer method which was consisted of 3.66% (EPA), and 13.29% (DHA) and also Soxhlet extraction method with value of EPA was 2.78% and DHA was 9.62%.<br />Keywords: EPA, extraction temperature, DHA, fish oil quality, fish skin
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Songquan, ZHU, LIU Zhengwen, and GU Xiaohong. "Changes of the fish fauna and fish yield analysis in Lake Taihu." Journal of Lake Sciences 19, no. 6 (2007): 664–69. http://dx.doi.org/10.18307/2007.0607.
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Palada, M. C., W. Cole, S. M. A. Crossman, J. E. Rakocy, and J. A. Kowalski. "535 PB 017 POTENTIAL OF FISH CULTURE WASTE WATER AS AN IRRIGATION AND NUTRIENT SOURCE FOR BELL PEPPERS IN THE VIRGIN ISLANDS." HortScience 29, no. 5 (1994): 508b—508. http://dx.doi.org/10.21273/hortsci.29.5.508b.
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Using fish culture waste water may benefit vegetable production by reducing the need for high quality irrigation water. Fish waste water also contains nutrients, reducing the need for chemical fertilizers. A study was conducted to integrate fish (tilapia) culture with field production of bell pepper (Capsicum annuum L.). Waste water from low and high fish stocking densities and variable water exchange rates were applied to bell peppers 2 to 3 times weekly. These treatments were compared with fish sludge. cow manure and commercial N fertilizer. Fish waste water and sludge were applied by hand in the first year. A modified irrigation system was used in the second year. All other treatments were drip irrigated. In 1992 marketable yield was highest (9.0 t/ha) in plots with N fertilizer (drip fertigation) followed by plots applied with sludge (5.0 c/ha). Lowest yield (2.0 t/ha) was obtained from plots applied with fish waste water. In 1993 plots applied with fish waste water had a slightly higher yield (7.0 t/ha) than N-fertigated plots. Marketable yield was highest (10.4 t/ha) in plots treated with sludge.
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Datta, S. N., N. K. Tripathy, S. Rajamani, and K. S. Rao. "Yield of Rice-Fish Cultivation At Cuttack, India." International Rice Research Newsletter 11, no. 6 (1986): 37. https://doi.org/10.5281/zenodo.7122159.
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This article 'Yield of Rice-Fish Cultivation At Cuttack, India' appeared in the International Rice Research Newsletter series, created by the International Rice Research Institute (IRRI). The primary objective of this publication was to expedite communication among scientists concerned with the development of improved technology for rice and for rice based cropping systems. This publication will report what scientists are doing to increase the production of rice in as much as this crop feeds the most densely populated and land scarce nations in the world.
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Tosin, Okomoda Victor, Solomon Shola Gabriel, Songbe S. Wukatda, Ikape Simon I, Ikhwanuddin Mhd, and Abol-Munafi Ambok Bolong. "Fillet Yield and Length-Weight Relationship of Five Fish Species From Lower River Benue, Makurdi, Nigeria." Tropical Life Sciences Research 32, no. 1 (2021): 161–72. http://dx.doi.org/10.21315/tlsr2021.32.1.10.
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The body characteristics and yield indices of Clarias gariepinus, Bagrus bajad, Synodontis nigrita, Labeo senegalensis and Mormyrus rume from lower Benue River in Nigeria were determined in this study using 60 samples each for the fish species. Length, weight and fillet correlations were also determined during the study. Results obtained showed that M. rume, L. senegalensis and C. gariepinus had the highest percentage of edible parts (≥ 55%) compared to the other species (≤ 39%). Concerning correlations of the fillet with the morphological variables, results obtained suggest that fillet yield is independent of fish size (except for C. gariepinus which was positively correlated). Also, only samples of L. senegalensis showed isometric growth pattern; the other fish species had either positive (C. gariepinus and B. bajad) or negative (S. nigrita and M. rume) allometric growth. While the difference in fillet yield and body characteristics was attributed to the structural anatomy and other biological dynamics of the fishes, this study could not establish a connection between fillet yield and the length-weight relationship. It was concluded that M. rume, L. senegalensis and C. gariepinus would be better export products because of their higher fillet yields.
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Indra, A. N., N. N. Dewi, G. Mahasri, B. S. Rahardja, and O. Z. Arifin. "The Effect Of Stocking Densities On Growth And Survival Rate Of Thai Mahseer (Tor Tambroides) During Nursery Stage." IOP Conference Series: Earth and Environmental Science 1392, no. 1 (2024): 012009. http://dx.doi.org/10.1088/1755-1315/1392/1/012009.
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Abstract Tor Fish are freshwater fisheries resources that have the potential to be found in Indonesia. Tor fish has been in high demand among entrepreneurs and the broader public. Tor tambroides (Sapan fish or Thai mahseer fish seed fish), Tor douronensis (Semah or Garing fish), Tor soro (Soro, Lempon, or Dewa fish), and Tor tambra are the four kinds of Tor fish native to Indonesia. Tor fish is a native indigenous freshwater fish from Indonesia that is on the verge of extinction. The Tor tambroides fish population in nature has declined and is on the verge of extinction as a result of widespread poaching for eating and trade as an ornamental fish. Thai mahseer fish seed fish cultivation activities include hatchery, nursery and enlargement. To protect populations of Thai mahseer fish seed fish from scarcity, Thai mahseer fish seed fish cultivation needs to do to prevent the scarcity of Thai mahseer fish seed fish in their natural habitat and Thai mahseer fish seed fish have high potential as freshwater fish in the aquaculture sector. This research aims to determine the impact of various stocking densities on growth and survival rates for Thai mahseer fish seeds, as well as the optimal density to support growth and survival rates. The study used a Random Design Complete (RDC) with four treatments and five replications. Feeding was provided ad libitum in the morning and evening. Given differences in the stocking density of Thai mahseer fish seeds, the results revealed a significant impact on all treatments. Treatment 1 had the greatest daily growth rate with a stocking density of 2 seeds/L and a yield of 0.015±0.003; specific growth rate. The highest absolute weight growth obtained was in Treatment 1 with a yield of 1.01gr; the highest absolute length growth obtained was in Treatment 1 with a yield of 2.9cm; and the highest survival rate for Thai mahseer fish seeds was obtained in Treatment 1 with a yield of 80%.
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Zhang, Guiyou, Yan Lu, Zijun Fang, Hong Yang, and Zhong Wei. "Analysis of the Ecological Carrying Capacity of Fish Resources in Shengjin Lake, Anhui Province, China." International Journal of Environmental Research and Public Health 19, no. 13 (2022): 8177. http://dx.doi.org/10.3390/ijerph19138177.
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The carrying capacity of fish is related to the sustainability of fisheries’ activities in water bodies. The fish carrying capacity of a water body is the maximum fish yield that can be carried by the natural bait organisms in the water body under the ideal natural conditions without feeding and fertilization. The evaluation of fish productivity is an important basis for rational stocking, rational fishing, and the scientific utilization of natural bait resources in a water area. This paper adopts the background data of the Shengjin Lake fishery ecosystem and uses the bait-based estimation method. The results show that (1) the annual yield of silver carp fed on phytoplankton is 1.5 million kg; (2) the annual yield of bighead carp fed on zooplankton is 1.295 million kg; (3) the annual yield of benthos is 310,000 kg; (4) the annual yield of organic detritus is 280,000 kg; and (5) as the coverage of water grass in Shengjin Lake is less than 10%, it should be protected and restored rather than used by fish. In general, the annual maximum carrying capacity of fish in Shengjin Lake is 3.385 million kg, except for water and grass.
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Forbes, L. Scott, and Randall M. Peterman. "Simple Size-Structured Models of Recruitment and Harvest in Pacific Salmon (Oncorhynchus spp.)." Canadian Journal of Fisheries and Aquatic Sciences 51, no. 3 (1994): 603–16. http://dx.doi.org/10.1139/f94-062.
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Growing evidence suggests that in Pacific salmon (Oncorhynchus spp.), components of reproductive success besides fecundity are size dependent. However, managers setting escapement goals usually estimate reproductive potential of a stock in terms of total number of spawners, number of female spawners, or potential egg deposition given a mean size of spawners. Interannual variation in size composition of spawners may thus result in errors in assessing reproductive potential. Here, we develop models of recruitment and harvest and determine optimal size-selective harvesting strategies. These optimal strategies range from the current large-fish harvests (larger-than-average fish are caught, leaving smaller fish to spawn) to small-fish harvests, where the reverse is true. If the body mass (M) of individual spawners increases more rapidly than reproductive success (RS) with respect to increasing length of adult females (e.g., if number of eggs alone best measures RS), then sustainable biomass yield is maximized by the current large-fish harvest. However, if RS/M increases with increasing length of females (e.g., if total biomass of eggs best measures RS), then small-fish harvest maximizes sustainable yield. Evidence suggests that some salmon populations show this latter pattern; thus, large-fish harvests may generate suboptimal yields.
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Hightower, Joseph E., and Gary D. Grossman. "Comparison of Constant Effort Harvest Policies for Fish Stocks with Variable Recruitment." Canadian Journal of Fisheries and Aquatic Sciences 42, no. 5 (1985): 982–88. http://dx.doi.org/10.1139/f85-123.
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Environmental variability may have a substantial influence on marine fish stocks, primarily by affecting survival to the time of recruitment. Simulation studies at low, intermediate, and high levels of variability in recruitment were used to compare alternative constant effort policies for anchovy (Engraulis capensis), Atlantic menhaden (Brevoortia tyrannus), and Pacific ocean perch (Sebastes alutus) fisheries. These policies were either to maintain effort at the level producing maximum sustainable yield (fMSY), or to permit levels of effort 25–100% greater than fMSY. An increase in effort of 25% above fMSY typically did not reduce annual yield significantly; however, a significant reduction in yield was apparent in all cases when effort increased by 75–100%. When recruitment is highly variable, comparable yields may be obtained at several levels of fishing effort. In such cases, environmental variability provides the fishery manager with considerable flexibility to enhance social or economic benefits without decreasing yields significantly.
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Schroeder, Gerald L., and Steven Serfling. "High-yield aquaculture using low-cost feed and waste recycling methods." American Journal of Alternative Agriculture 4, no. 2 (1989): 71–74. http://dx.doi.org/10.1017/s0889189300002769.
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AbstractConventional, low-yield aquaculture methods use earthen, standing water fish ponds that typically are stocked with 0.5 to 2 fish/m2and produce 3 to 10 tons of fish/ha/year using refined feeds. At higher fish stocking densities and fish yield, production of metabolites and residues exceeds such a pond's natural recycling capability, so that a higher rate of flushing is required. This wastes water and valuable nutrients and creates a potentially polluting effluent In an alternative system, by increasing the rate at which the metabolites and feed wastes are microbially processed within the culture system, production rates exceeding 500 tons of tilapia fish/ha/year have been attained with less than 0.5 percent water change daily. In preliminary experiments in this closed bioconversion system, we have replaced all formulated feeds with agricultural residues and fertilizers, which are converted into protein by intense microbial processing. The rate of fish growth indicated that much or possibly all the feed requirements of tilapia grown in this type of closed, densely stocked system can be satisfied by intense cultivation of heterotrophic microbes.
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I, Gede Sujana Eka Putra, and Luh Putu Labasariyani Ni. "Dashboard Model Design for Tuna Fish Processing (PT. XYZ)." Global Journal of Engineering and Technology Advances 14, no. 1 (2023): 039–49. https://doi.org/10.5281/zenodo.7683495.
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The dashboard systems provide visualization model help the management to make decision which shows the data summary in each processing stage and comparison of total result of main product and side product in specific periods of time at fish processors. This research proposes dashboard model to designed in fish processors which huge of complex processing data available and have difficulties to analyze and require some times to process data analytical to display the production result in each processing stage. We design analytical dashboard to show the quantity fish processed and seafood product summary analysis in each processing stage i.e. total weight of receiving, cutting, retouching, packing and shipment. The dashboard system helps the management to make quick decision based on analytical information related to how many fish processed, product result per each processing stage, and also help to compare yield in cutting and retouching process based on type of raw materials (dirty loin and clean loin). This dashboard also displayed details total production and total side product (by-product) i.e. black meat, belly, red meat, and residue. The scope of this research is to display summary analytical data from the periods September until November of 2022. Based on the calculation, the yield of cutting process during the period September to November was 63.7%, while the yield for retouching process was 57.65%. In this research it explained that by-product percentage for dirty loin cutting shows a higher percentage compared to clean loin because the dirty loin has more parts to remove.
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Marpaung, A. E., B. Karo, S. Barus, R. C. Hutabarat, and R. Tarigan. "Increasing the quantity and quality of potatoes by utilizing seed size and fish organic fertilizer." E3S Web of Conferences 373 (2023): 03001. http://dx.doi.org/10.1051/e3sconf/202337303001.
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Potato plants are one of the vegetables that are in great demand by consumers so they have high economic value and needs. The fulfillment of high needs must be accompanied by increased productivity. Increased potato production can be done, among others, by the use of seeds and proper fertilization. This study aims to determine the use of seed size and addition of fish organic fertilizer with inorganic fertilizer efficiency in increasing potato growth and yield. The study is carried out from June until September 2019 in research and assessment installation of agricultural technology, Dolat Rayat District, Karo Regency. The research placed altitude is ± 1,340 m above sea level, and the soil type is Andisol. The research design is a factorial randomized block and consists of three replications. The first-factor treatment is seed size (big >20 g, medium 5-20 g, small <5 g). The second factor is a fish organic fertilizer with efficiency inorganic fertilizer (100% inorganic fertilizer, 50% fish organic fertilizer + 75% inorganic fertilizer, 100% fish organic fertilizer + 50% inorganic fertilizer, and 150% fish organic fertilizer + 25% inorganic fertilizer). The result showed that big and medium seed sizes were able to increase potato growth and yield. Big and medium seed sizes were able to increase plant height by 11.06% and 9.63%, 5,73%, and 4,64% canopy width, 7.30%, and 11.10% leaf area index, and 12.62% and 25.06% yields from small seed size. Adding fish fertilizer with inorganic fertilizer efficiency resulted in growth and yield which is no different from the application of 100% inorganic fertilizer.
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Farhan Yasin Hamed, Farhan Yasin Hamed, Lydia Mikhailovna Vasilyeva, Natalia Viktorovna Sudakova, Ali Attala Muheisin, and Adelia Zakirovna Anokhina. "Results of experimental work on the application of the aquacrop rotation practice in fish ponds in Iraq." Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries), no. 6 (June 1, 2021): 56–67. http://dx.doi.org/10.33920/sel-09-2106-05.
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The use of the crop rotation method in fish farming makes it possible to increase fish productivity and crop yields in ponds. In the countries of the Middle East, in recent years, the Aqua Crop rotation practice has been developing, in particular, the consistent cultivation of fish and rice in fish ponds, which allows eliminating the contradictions between these crops and increasing production efficiency. In Iraq, an experiment was carried out on the variable cultivation of rice and carp in fish ponds for four years, with the aim of introducing this practice into the country’s agriculture. Four ponds, each with an area of 7.5 hectares, were involved. The research was carried out in two variants: in experiment No.1 rice was grown in the first year, fish in the second, then rice again and in the fourth year — fish, in the second experiment, on the contrary, at the beginning of the fish, then rice, etc. The fish-breeding season lasted 9 months (March to November). Fish-breeding indicators were studied in detail: survival rate, feed costs, fish productivity, the results of rice cultivation were judged by yield. In addition, indicators of economic efficiency were determined according to a simplified scheme. The results indicate that, in general, fish-breeding indicators turned out to be higher when growing fish in ponds after rice, so fish productivity increased by almost 30% with an average value of 3.9 t/ha, feed costs decreased, while rice yield increased by 15–16% and averaged 3.6 t/ha. The best fish-breeding indicators were obtained in the second experiment after rice was grown in the ponds for two years. Economic calculations confirmed the advantages of using the aquacrop rotation practice, so in the second experiment the cost of marketable fish decreased by 10%, and the profitability increased by almost 30%.
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Anwar, Chairil. "Pengaruh Jenis Ikan dan Metode Pemasakan terhadap Mutu Abon Ikan." Jurnal FishtecH 7, no. 2 (2018): 138–47. http://dx.doi.org/10.36706/fishtech.v7i2.5679.
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Fish is one source of animal protein that is widely consumed by society, is easy to get, and the price is cheap. But fish quickly experience the process of decay. Therefore, fish preservation should be known to all levels of society. One of the products of fish processing through the process of preservation is abon. Abon fish is a type of preserved food made from fish that are seasoned, processed by boiling, frying and pressing or separating oil. The resulting product has a soft shape, good taste, distinctive smell, and has a long-lasting power. This study aims to examine the effect of fish species and the method of cooking fish meat is the steaming and boiling treatment of the quality of fish produced abon. The results showed that fish species had a significant effect (P ? 0,01) on protein content, moisture content, fat content, ash content and color organoleptic value, and not significant (P> 0,05) to yield, the organoleptic value of texture, aroma, and flavor. The method of cooking fish meat was very significant (P ? 0,01) to protein content, fat content and not significant (P> 0,05) to yield, water content, ash content, the organoleptic value of texture, aroma, color, and flavor. The interaction between fish species and cooking method of fish meat had no significant effect (P> 0,05) on all parameters except on yield of abon fish produced.
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Wangboje, O. M. "Fish stock assessment and potential yield of a reservoir in Benin City, Nigeria." Dutse Journal of Pure and Applied Sciences 7, no. 4a (2022): 55–64. http://dx.doi.org/10.4314/dujopas.v7i4a.6.
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Fish stock assessments of aquatic ecosystems are relevant against the backdrop of over exploitation, fish species extinction and the inadequate management of aquatic resources especially in developing countries such as Nigeria. The study specifically examined the fish stock assessment and the potential fish yield of the Ikpoba reservoir in Benin City, Nigeria. A total of 903 fishes were captured from the reservoir with individual abundance ranging from 18 (1.99 %) for Epiplatys sexfasciatus to 286 (31.67 %) for Synodontis clarias. A total of 15 fish species belonging to 8 families were identified while the dominant fish species were S. clarias, Hemichromis fasciatus and Marcusenius psittacus. A total of 11 fish species were identified as rare in this study. The Ekiuwa station of the reservoir was the richest species-wise (d= 6.45) while the Midpoint station had the greatest general diversity of fish species (H= 1.42). There was a more even spread and distribution of fish species at the Midpoint station (E= 1.00) while the commonest fish species were most frequent at the Okhoro station (C= 1.62). In this study, the Condition Factor ranged from 1.00 for M. psittacus to 5.78 for Gnathonemus abadii. The potential fish yield index of the reservoir was low due to a low nutrient content and ranged from 17.7 in the dry months to 23.13 in the wet months. It was advocated that the Ikpoba reservoir must be continuously monitored in order to ensure that fish species composition and diversity do not reach critical limits.
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Jacobsen, Nis S., Henrik Gislason, and Ken H. Andersen. "The consequences of balanced harvesting of fish communities." Proceedings of the Royal Society B: Biological Sciences 281, no. 1775 (2014): 20132701. http://dx.doi.org/10.1098/rspb.2013.2701.
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Balanced harvesting, where species or individuals are exploited in accordance with their productivity, has been proposed as a way to minimize the effects of fishing on marine fish communities and ecosystems. This calls for a thorough examination of the consequences balanced harvesting has on fish community structure and yield. We use a size- and trait-based model that resolves individual interactions through competition and predation to compare balanced harvesting with traditional selective harvesting, which protects juvenile fish from fishing. Four different exploitation patterns, generated by combining selective or unselective harvesting with balanced or unbalanced fishing, are compared. We find that unselective balanced fishing, where individuals are exploited in proportion to their productivity, produces a slightly larger total maximum sustainable yield than the other exploitation patterns and, for a given yield, the least change in the relative biomass composition of the fish community. Because fishing reduces competition, predation and cannibalism within the community, the total maximum sustainable yield is achieved at high exploitation rates. The yield from unselective balanced fishing is dominated by small individuals, whereas selective fishing produces a much higher proportion of large individuals in the yield. Although unselective balanced fishing is predicted to produce the highest total maximum sustainable yield and the lowest impact on trophic structure, it is effectively a fishery predominantly targeting small forage fish.
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Xu, F. X., and Z. B. Tan. "Fish Output Effects on Rice Yield in a Rice-Fish Farming System in Luzhou Region, China." International Rice Research Newsletter 17, no. 6 (1992): 33. https://doi.org/10.5281/zenodo.7219090.
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This article 'Fish Output Effects on Rice Yield in a Rice-Fish Farming System in Luzhou Region, China' appeared in the International Rice Research Newsletter series, created by the International Rice Research Institute (IRRI). The primary objective of this publication was to expedite communication among scientists concerned with the development of improved technology for rice and for rice based cropping systems. This publication will report what scientists are doing to increase the production of rice in as much as this crop feeds the most densely populated and land scarce nations in the world.
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Kelkar, Nachiket, Rohan Arthur, Subhasis Dey, and Jagdish Krishnaswamy. "Flood-Pulse Variability and Climate Change Effects Increase Uncertainty in Fish Yields: Revisiting Narratives of Declining Fish Catches in India’s Ganga River." Hydrology 9, no. 4 (2022): 53. http://dx.doi.org/10.3390/hydrology9040053.
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River-floodplains support a significant number of small-scale capture fisheries despite having undergone degradation due to human modification of river flows by dams, pollution, and climate change. River fish production is underpinned by the annual flood-pulse and associated environmental changes that act as cues for spawning and dispersal for most species. However, studies on fish stock declines have focused more on overfishing than on hydroclimatic variability. Therefore, understanding how changes in flood-pulse variability influence fishing effort and yields is critical to inform adaptive fisheries’ management. We investigated hydroclimatic factors driving flood-pulse variability and fish catch–effort dynamics in India’s Ganga River over two decades (2000–2020). We compiled fishers’ narratives of changing fish catches through semi-structured interviews to compare them with our observed trends. Flood amplitude showed increasing variability, longer duration, and earlier rise timings, linked to La Niña and El Niño phases. Catches per unit effort were correlated with total yield and effort but did not decline as fishers thought, despite overall declines in yield over time. Hydroclimatic variability was a more significant driver of changing yields than local fishing pressure. Rising uncertainty in fisheries’ production, in response to increasing flood-pulse variability and altered flows in the Gangetic Plains, may be affecting fishing behaviour and underlying resource conflicts.
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Cao Quoc, Nam, Nico Vromant, Duong Le Thanh, and Frans Ollevier. "Factors affecting fish yield and profit in fish pen culture in flooded ricefields." Aquaculture International 20, no. 5 (2012): 827–45. http://dx.doi.org/10.1007/s10499-012-9505-9.
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Palada, M. C., W. M. Cole, S. M. A. Crossman, J. E. Rakocy, and J. A. Kowalski. "Fish Culture Water and Sludge Applied Via Drip Irrigation Improves Yield of Pak Choi (Brassica rapa L. Chinensis)." HortScience 30, no. 4 (1995): 885A—885. http://dx.doi.org/10.21273/hortsci.30.4.885a.
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Using fish culture water and sludge may benefit vegetable production by reducing the need for high-quality irrigation water in areas where water is a limiting resource for agriculture. Fish water and sludge contains nutrients, thereby reducing the need for chemical fertilizers. A study was conducted to integrate fish (tilapia) culture with field production of Pak choi (Brassica rapa L. Chinensis). Water from tilapia culture tanks from which solids were removed (SR) and from tanks with no solid removal (NR) were applied to pak choi 2 to 3 times weekly through a drip system. These treatments were compared with sludge (FS) removed from culture tanks using three methods of irrigation. Conventional methods of fertigation (F) and band fertilizer (B) application were included as control treatments. The trial was conducted for 2 seasons. In the first season, pak choi applied with (FS) produced total yields ranging from 21 to 26 t·ha–l. Pak choi applied with fish water from tanks with (SR) and (NR) produced yields of 19 and 20 t·ha–l, respectively. Pak choi grown with (F) and (B) applications yielded 21 and 20 t·ha–l, respectively. There were no significant yield differences between the (FS) treated and (F) plots. Yield from (FS) treatment was significantly higher than all other treatments except (F). Similar results were obtained during the second season, but total yields from various treatments were 50% higher than the first season. Fish culture water and sludge are therefore good alternative sources of irrigation and fertilizer for pak choi.
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Simões, Welson L., Jony E. Yuri, Miguel J. M. Guimarães, José E. dos Santos, and Emanoel F. J. Araújo. "Beet cultivation with saline effluent from fish farming." Revista Brasileira de Engenharia Agrícola e Ambiental 20, no. 1 (2016): 62–66. http://dx.doi.org/10.1590/1807-1929/agriambi.v20n1p62-66.
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ABSTRACT This study aimed to evaluate the distribution of salts along the soil profile, the biometric parameters and the yield of beet cultivars under different leaching fractions using saline effluent from fish farming, under the conditions of the Sub-middle São Francisco Valley. An experiment was conducted at the Caatinga Experimental Field of the Embrapa Semi-Arid, in 2013. The treatments were arranged in split plots composed of four leaching fractions (0, 5, 10 and 15%) in the plots, with saline effluent from fish farming, and three table beet cultivars in the subplots: Scarlet Super, Early Wonder 200 and Fortuna. The analysed parameters were: salt distribution along the soil profile, number of leaves, length and width of leaves and petioles, total and commercial yields. The application of leaching fractions of 10 and 15% promoted better salt distribution along the soil profile. The beet cultivar Fortuna showed the highest commercial yield for a lower leaching fraction.
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Junianto, Ditidewa Aristia Rakan, Ajid Zaenal, et al. "Characteristics (Yield, Moisture Content, Water Absorption, Ph, and Organoleptic) of Catfishflour (Pangasius hypophthalmus)." Asian Journal of Fisheries and Aquatic Research 23, no. 1 (2023): 24–30. http://dx.doi.org/10.9734/ajfar/2023/v23i1593.
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Fish meal is a dry solid product, produced by removing most of the liquid and some or all of the fat contained in the body of the fish. This research aims to analyze the characteristics of catfish flour that is given preliminary treatment, namely steamed and boiled and control (without heating) before the drying process. This research is divided into 2 stages, namely phase I research on making fish meal from Patin Fish (Pangasius hypopthalmus) with 3 treatments, namely control, boiling, and steaming and phase II research, namely the test characteristics on catfish meal such as yield tests, organoleptic tests, absorption, water content, and pH.Based on the results of research on the characteristics of catfish flour obtained from the first treatment, control on fish meat before drying is as follows: flour yield 21.7 ± 0.54%; moisture content 5.9 %; absorbency 1.28 %; pH 5.93; and very pungent aromatic organoleptic character, coarse powder and brownish color. Thecharacteristics of catfish flour obtained from the second treatment, namely boiling on fish meat before drying, are as follows: flour yield 12.33%; moisture content 1.8%;absorbency 1.6%; pH5.8; and fish-scented organoleptic character in general, semi-fine, yellowish in color. Thecharacteristic of catfish flour obtained from the third treatment, namely steaming on fish meat before drying, is as follows: flour yield 13.37%; moisture content 2.2%; absorbency 1.8%; pH 5.5; and organoleptic character of non-pungent aroma, fine powder, and yellowish-whitecolor.
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Edward, J. B. "Evaluation of the Fisheries Potentials ofEgbe Reservoir, Ekiti State, Nigeria." Greener Journal of Biological Sciences 3, no. 7 (2013): 260–67. https://doi.org/10.15580/gjbs.2013.7.122912346.
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The fish composition and abundance of Egbe Reservoir, Egbe Ekiti, Ekiti State were investigated from September 2005 to December 2006. Fish samples were collected from fishermen using funnel traps, gill nets and cast nets, 75mm mesh size. Five families of fish: Cichlidae, Clariidae, Channidae, Hepsetidae, and Mormyridae consisting of eight species were encountered. Cichlidae dominated the fish population (52.1%) and Oreochromis niloticus was the most abundant species. Estimated annual potential fish yield was 413.9 kg/ha/annum while post-calculated fish yield was 126.6kg/ha with 4.8% of the fishery resources exploited. The few species of fish and their abundance encountered in the reservoir indicated that the reservoir is under- exploited and it can support increased fish production if adequately stocked and properly managed to enhance sustainable use of its aquatic resources.
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Lewis, C. A., D. H. Schupp, W. W. Taylor, J. J. Collins, and R. W. Hatch. "Predicting Great Lakes Fish Yields: Tools and Constraints." Canadian Journal of Fisheries and Aquatic Sciences 44, S2 (1987): s411—s416. http://dx.doi.org/10.1139/f87-342.
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Prediction of yield is a critical component of fisheries management. The development of sound yield prediction methodology and the application of the results of yield prediction are central to the evolution of strategies to achieve stated goals for Great Lakes fisheries and to the measurement of progress toward those goals. Despite general availability of species yield models, yield prediction for many Great Lakes fisheries has been poor due to the instability of the fish communities and the inadequacy of available data. A host of biological, institutional, and societal factors constrain both the development of sound predictions and their application to management. Improved predictive capability requires increased stability of Great Lakes fisheries through rehabilitation of well-integrated communities, improvement of data collection, data standardization and information-sharing mechanisms, and further development of the methodology for yield prediction. Most important is the creation of a better-informed public that will in turn establish the political will to do what is required.
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Ljubojević, Dragana, Miroslav Ćirković, Nikolina Novakov, Jelena Babić, Jelena Lujić, and Todor Marković. "Factors affecting the yield of carp fish species." Tehnologija mesa 53, no. 1 (2012): 14–19. http://dx.doi.org/10.5937/tehmesa1201014l.
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Nzioka, R. M. "Fish yield of Kilifi coral reef in Kenya." Hydrobiologia 208, no. 1-2 (1990): 81–84. http://dx.doi.org/10.1007/bf00008446.
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