Journal articles: 'Fish and Aquacultural Science'

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Bhattarai, Kiran K., Chongrak Polprasert, and Bindu N. Lohani. "Models for Aquacultural Treatment of Septage." Water Science and Technology 18, no. 7-8 (July 1, 1986): 103–12. http://dx.doi.org/10.2166/wst.1986.0280.

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The research programme on aquacultural treatment of nightsoil has been conducted at the Asian Institute of Technology (AIT) for about 10 years. This paper emphasizes only the research scheme in which nightsoil is fed directly into single-stage, non-flow-through ponds for the production of algae and fish Tilapia (Qreochromisniloticus). The culture of herbivorous fish such as Tilapia in the same pond to graze on the algae is practical, in order to produce the fish protein biomass which is easily harvestable for animal (or human) food. Dynamic and empirical models describing the performance of nightsoil-fed fish ponds were developed to simulate the temporal changes of various physico-chemical and biological parameters including dissolved oxygen, carbon dioxide, bacteria, algae, and fish growth. These models were based on the basic mechanisms and phenomena occurring in the ponds, and the simulated results calculated from the Continuous System Modelling Programme (CSMP) computer package available at the AIT Regional Computer Center.

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Klíma, Ondřej, Radovan Kopp, Lenka Hadašová, and Jan Mareš. "Fin condition of fish kept in aquacultural systems." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 61, no. 6 (2013): 1907–16. http://dx.doi.org/10.11118/actaun201361061907.

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Fish fins seem to be a suitable indicator of welfare state. In natural conditions there is no worsenig of fin condition. Damaged fins occur in aquacultural systems only. They are characterized by shortening size, frayed rays, disturbing of fin tissue, lesions and necrosis creation. Possible causes are aggressive behaviour of fish, inapropriately chosen size of stocking density, feeding management, diet composition, rearing system, water quality, thoughtless manipulation with fish and bacterial infections. Mostly, dorsal and pectoral fins are damaged in salmonids (not in percids). For evaluation there are all fins except adipose fin used. Lenght of fins is measured and the visual aspect is assessed. Mostly used method is “Relative fin length”. Adjustment of rearing conditions, feeding ratio increasing, propriate diet composition (amino acids and minerals), rearing fish in duoculture, preventive baths in chloramine–T, prefering of ground canals and fishponds can conduce to improving of fin condition. Bad fish condition worsens swimming and it can rule the saleability of fish. Aquacultural systems do not allow natural fish farming. That is why it is necessary to assess welfare of kept fish. The fin appearance informs about condition of rearing environment.

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Smith, Daniel Wilkins. "Biological Control of Excessive Phytoplankton Growth and the Enhancement of Aquacultural Production." Canadian Journal of Fisheries and Aquatic Sciences 42, no. 12 (December 1, 1985): 1940–45. http://dx.doi.org/10.1139/f85-240.

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A method is proposed to control phytoplankton biomass in aquacultural ponds, using both zooplankton and filter-feeding silver carp (Hypophthalmichthys molitrix). The technique maintains co-existence of zooplankton and filter-feeding fish by excluding the fish from part of the water column. Zooplankton, which feed on smaller algal species, and silver carp, which feed on large algae and zooplankton, together can consume all sizes of phytoplankton, thus controlling algal biomass. This technique was tested in 1000-L tanks, some containing channel catfish (Ictalurus punctatus) alone, some both catfish and silver carp, and others catfish and silver carp with a zooplankton refuge. The refuge permitted coexistence of high densities of large zooplankters with the filter-feeding fish. This combination of filter-feeders reduced algal biomass by as much as 99%, increased phytoplankton diversity, and showed a trend toward improved silver carp growth compared with treatments without a refuge. The proposed technique could be applied to both intensive and extensive aquacultural systems.

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Schmidt, Anja S., Morten S. Bruun, Inger Dalsgaard, Karl Pedersen, and Jens L. Larsen. "Occurrence of Antimicrobial Resistance in Fish-Pathogenic and Environmental Bacteria Associated with Four Danish Rainbow Trout Farms." Applied and Environmental Microbiology 66, no. 11 (November 1, 2000): 4908–15. http://dx.doi.org/10.1128/aem.66.11.4908-4915.2000.

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ABSTRACT Surveillance of bacterial susceptibility to five antimicrobial agents was performed during a 1-year period in and around four freshwater fish farms situated along a stream in western Denmark. Besides assessing the levels of antibiotic resistance among the culturable fraction of microorganisms in fish, water, and sediment samples, two major fish pathogens (88Flavobacterium psychrophilum isolates and 134Yersinia ruckeri isolates) and 313 motileAeromonas isolates, representing a group of ubiquitous aquatic bacteria, were isolated from the same samples. MICs were obtained applying a standardized agar dilution method. A markedly decreased susceptibility of F. psychrophilum isolates to most antimicrobial agents presently available for use in Danish aquaculture was detected, while the collected Y. ruckeriisolates remained largely sensitive to all therapeutic substances. Comparing the inlet and outlet samples, the increase of the antibiotic-resistant proportions observed among the culturable microflora was more pronounced and statistically significant among the motile aeromonads. High levels of individual and multiple antimicrobial resistances were demonstrated within the collected flavobacteria and aeromonads, thus indicating a substantial impact of fish farming on several groups of bacteria associated with aquacultural environments.

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Shereif, M. M., M. El-S. Easa, M. I. El-Samra, and K. H. Mancy. "A demonstration of wastewater treatment for reuse applications in fish production and irrigation in Suez, Egypt." Water Science and Technology 32, no. 11 (December 1, 1995): 137–44. http://dx.doi.org/10.2166/wst.1995.0422.

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About 400 m3/d of raw sewage from the City of Suez were diverted and treated by two parallel pond systems. The first treatment system was conventional Waste Stabilization Ponds which included anaerobic, facultative, and maturation compartments for a total residence time of 21 days. The second system included a series of four plankton ponds with a total residence time in the order of 26 days. The effluent from these inexpensive, but yet effective treatment technologies, was found to conform to the World Health Organization (WHO) standards for unrestricted agricultural and aquacultural applications. The treated waste effluent was successfully used to grow two types of local fish, i.e.Oreochromis niloticus and Mugil sehli. Fish production, without supplemental feeding or pond aeration, reached 5-7 metric tons/hectare/year. Furthermore, the fish were found to be free from human parasites and safe for human consumption. The nutrient rich effluent from the fish pond was further used to grow trees and cultivate certain types of crops, i.e. barley, maize, beets and ornamental plants. This study clearly demonstrates the effectiveness and benefits of waste stabilization ponds systems for low cost treatment of domestic waste and the combined reuse in aquaculture and agriculture applications. In addition, the unique treatment/reuse facilities constructed at Suez will continue to function as an experimental station and serve scientists and engineers to study and to plan applications in Egypt and the region.

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Slavík, O., and P. Horký. "Wild and farmed burbot Lota lota: differences in energy consumption and behavior during the spawning season." Aquaculture Environment Interactions 13 (March 11, 2021): 51–63. http://dx.doi.org/10.3354/aei00389.

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Farmed fish released in a native environment can display different spawning behaviour compared to their wild conspecifics. In our study, farmed and wild burbot, a species recently introduced for aquacultural production, were equipped with electromyogram (EMG) radio tags. EMG biotelemetry allows a description of the spatial distribution of fish together with simultaneous measurements of individual energy consumption. Farmed burbot were released into the wild to simulate stocking or hatchery escape and were observed over a nocturnal phase during November to January. The observational period was assumed to cover the whole spawning season, including an expected peak of spawning activity determined according to egg production by naturally spawning burbot in an experimental seminatural river channel. We detected increased energy consumption and lower movement activity at the time of expected peak spawning for wild burbot only. Across the whole spawning season, farmed females showed lower movement activity and energy consumption than wild females, whereas the opposite results were found for farmed males. Farmed and wild fish kept larger distances between each other than the individuals within a group (farmed and wild) across the whole spawning season. The closest positions occurred between males and females in the wild group, while for farmed fish, the closest position was found within the same sex. Sexually conditioned energy consumption and spatial distribution differed between wild and farmed fish.

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Clonts, Howard A., Curtis M. Jolly, and Syed Abdulkadir L. Alsagoff. "An Ecological Foodniche Concept as a Proxy for Fish-Pond Stocking Rates in Integrated Aquacultural Farming for Malaysia." Journal of the World Aquaculture Society 20, no. 4 (December 1989): 268–76. http://dx.doi.org/10.1111/j.1749-7345.1989.tb01014.x.

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Fattal, B., A. M. Eisawy, A. Dotan, H. I. Shuval, and K. H. Mancy. "Impact of Water Quality on Fish Production Based on Egyptian and Israeli Practices." Water Science and Technology 21, no. 3 (March 1, 1989): 27–33. http://dx.doi.org/10.2166/wst.1989.0074.

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This study deals with an Israel-Egypt-USA collaborative project on the health risks and technological options for fish grown in polluted waters. The fish were grown in aquaculture either with wastewater–enrichment or without. The study included one effluent polishing pond, two fish ponds and two water reservoirs. The fish stock in the ponds and reservoirs consisted mainly of tilapia (usually hybrids of Sarotherodonniloticus × S. aureus). The results of Israeli and Egyptian studies indicated that, on the average, the yields for wastewater aquaculture were higher than the yields without wastewater. However the Egyptian study showed that in areas with inadequate dilution of wastewater by freshwater near to a sewage outfall, there were negative effects on fish production. Microbiological assays (E.coli and Aeromonas) of water and fish tissues, indicate that the Aeromonas counts were high in the water as well as in the fish tissue. The bacterial count was higher in the digestive tract than in the water in which the fish were grown. In most cases only Aeromonas was detected in muscles. There was no difference between wastewater-enriched and nonwastewater aquacultures for both E.coli and Aeromonas concentrations in fish tissues.

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Howe, Jeffry C. "Fish nutrition in aquaculture." Fisheries Research 26, no. 3-4 (May 1996): 387–90. http://dx.doi.org/10.1016/s0165-7836(96)90006-5.

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10

Lyndon, A. R. "Fish nutrition in aquaculture." Aquaculture 134, no. 3-4 (July 1995): 374–75. http://dx.doi.org/10.1016/0044-8486(95)90085-3.

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Stamm, John M. "In Vitro Resistance by Fish Pathogens to Aquacultural Antibacterials, Including the Quinolones Difloxacin (A-56619) and Sarafloxacin (A-56620)." Journal of Aquatic Animal Health 1, no. 2 (June 1989): 135–41. http://dx.doi.org/10.1577/1548-8667(1989)001<0135:ivrbfp>2.3.co;2.

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12

Jassim, Abdul Amer R. "Field study of fish farming status in Basrah Governorate Aquaculture Dept., Marine Science Centre, Basrah University, IRAQ." IRAQI JOURNAL OF AQUACULTURE 10, no. 1 (2013): 63–74. http://dx.doi.org/10.21276/ijaq.2013.10.1.5.

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13

Watson, Lynn, Ross Potter, Cory Murphy, and Ryan Gibbs. "The Development and Single-Laboratory Validation of a Method for the Determination of Steroid Residues in Fish and Fish Products." Journal of AOAC INTERNATIONAL 98, no. 3 (May 1, 2015): 580–87. http://dx.doi.org/10.5740/jaoacint.14-281.

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Abstract Due to potential use in aquacultured fish products, the Canadian Food Inspection Agency has identified residue testing for steroids as a priority. These compounds are used in aquaculture primarily to direct sexual differentiation with both androgens and estrogens applied depending on the desired outcome. Published research is lacking with respect to steroid residue testing in fish; however, recent studies in other matrixes provided transferable cleanup techniques. A simple, rapid, and sensitive method was developed and validated for use in monitoring aquacultured fish products for the presence of methyltestosterone, nandrolone, epi-nandrolone, boldenone, and epi-boldenone residues. The developed method consists of solvent extraction followed by cleanup using hexane and dual cartridge SPE with analysis by ultra-HPLC-MS/MS. The method is capable of detecting and confirming steroid residue levels ranging from 0.05 to 25 ng/g in salmon and tilapia, depending on the analyte. Recoveries ranged from 88 to 130% for the analytes. Instrument repeatability was less than 13% for all compounds, while intermediate precision ranged from 5 to 25% RSD. HorRat values were within acceptable ranges.

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TEY, YAO HSIEN, KOA-JEN JONG, SHIN-YUAN FEN, and HIN-CHUNG WONG. "Occurrence of Vibrio parahaemolyticus, Vibrio cholerae, and Vibrio vulnificus in the Aquacultural Environments of Taiwan." Journal of Food Protection 78, no. 5 (May 1, 2015): 969–76. http://dx.doi.org/10.4315/0362-028x.jfp-14-405.

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The occurrence of Vibrio parahaemolyticus, Vibrio vulnificus, and Vibrio cholerae in a total of 72 samples from six aquaculture ponds for groupers, milk fish, and tilapia in southern Taiwan was examined by the membrane filtration and colony hybridization method. The halophilic V. parahaemolyticus was only recovered in seawater ponds, with a high isolation frequency of 86.1% and a mean density of 2.6 log CFU/g. V. cholerae was found in both the seawater and freshwater ponds but preferentially in freshwater ponds, with a frequency of 72.2% and a mean density of 1.65 log CFU/g. V. vulnificus was identified mainly in seawater ponds, with an isolation frequency of 27.8%. The density of V. parahaemolyticus in seawater ponds was positively related to water temperature (Pearson correlation coefficient, r = 0.555) and negatively related to salinity (r = −0.333). The density of V. cholerae in all six ponds was positively related to water temperature (r = 0.342) and negatively related to salinity (r = −0.432). Two putatively pathogenic tdh+ V. parahaemolyticus isolates (1.4% of the samples) and no ctx+ V. cholerae isolates were identified. The experimental results may facilitate assessments of the risk posed by these pathogenic Vibrio species in Taiwan, where aquaculture provides a large part of the seafood supply.

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Weeks, Priscilla. "Fish and people: Aquaculture and the social sciences." Society & Natural Resources 5, no. 4 (October 1992): 345–57. http://dx.doi.org/10.1080/08941929209380798.

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Powell, M. S. "Fish Genetics and Aquaculture Biotechnology." Aquaculture Research 37, no. 6 (April 2006): 652–53. http://dx.doi.org/10.1111/j.1365-2109.2006.01464.x.

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Kirk, R. "Fish aquaculture. Technology and experiments." Aquaculture 61, no. 1 (March 1987): 79–80. http://dx.doi.org/10.1016/0044-8486(87)90342-5.

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Zhang, Yuanyuan, Ze Fan, Di Wu, Jinnan Li, Qiyou Xu, Hongbai Liu, and Liansheng Wang. "Dietary magnesium requirement on dietary minerals and physiological function of juvenile hybrid sturgeon (Acipenser schrenckii♀ × Acipenser baerii♂)." Aquaculture International 29, no. 4 (May 13, 2021): 1697–709. http://dx.doi.org/10.1007/s10499-021-00712-7.

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AbstractSturgeons are an economically important freshwater aquacultural fish in China and elsewhere. Research was conducted to study the magnesium requirement of juvenile hybrid sturgeon (Acipenser schrenckii♀ × Acipenser baerii♂) based on mineral composition, proximate chemical analysis, antioxidant enzyme levels, and growth metrics. Different levels of magnesium supplements (43.2, 157.3, 326.5, 549.6, 743.9, 938.4, and 1118.2 mg kg−1) were fed to juvenile sturgeon for 8 weeks. Five hundred twenty-five juvenile hybrid sturgeons (an average initial body weight of 7.65 g) were randomly divided into 7 groups with 3 replicates each (25 fish per replicate, tanks of 100×50×50 cm, dissolved oxygen ≥ 5.0 mg L−1, 12 light:12 dark) and fed 4 times per day with the experimental diets containing 40.78% crude protein and 10.03% crude fat. The body tissues and blood of fish were then sampled and analyzed. Growth performance was not significantly different between treatments (P>0.05). The optimal dietary magnesium requirement for hybrid sturgeon was estimated to be 355.16, 573.6, or 584.6 mg kg−1 dietary magnesium based on whole-body Mg retention, the whole-body or vertebrae magnesium content versus dietary magnesium levels. The whole-body calcium to phosphorus ratio of the 43.2 and 326.5 mg kg−1 groups was significantly higher than that of the 938.4 mg kg−1 group (P< 0.05). A dietary magnesium concentration of 350–700 mg kg−1 improved the antioxidant capacity by decreasing the serum malondialdehyde and enhancing serum superoxide dismutase, glutathione peroxidase, and catalase activities.

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Reinders, Machiel J., Marija Banovi´, Lluis Guerrero, and Athanasios Krystallis. "Consumer perceptions of farmed fish." British Food Journal 118, no. 10 (October 3, 2016): 2581–97. http://dx.doi.org/10.1108/bfj-03-2016-0097.

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Purpose The purpose of this paper is to investigate possible cross-cultural consumer segments in the EU aquaculture market and provide direction and focus for marketing strategies for farmed fish products. Design/methodology/approach Selected psychographic constructs (i.e. category involvement, domain-specific innovativeness, subjective knowledge, suspicion of novelties and optimistic bias) are tested as segmentation basis with the objective of defining a number of cross-border consumer segments with distinctive and clear-cut profiles in terms of consumer perceptions towards farmed fish. Findings Based on the consumer psychographic profiles, three distinct segments are found: involved traditional, involved innovators and ambiguous indifferent, of which the first two constitute especially interesting targets for market positioning strategies for aquaculture products. Practical implications The results of the segmentation analysis opens new horizons in terms of positioning and differentiation of fish products from the aquaculture industry according to the most important potential market segments. Originality/value The current research brings insights into different pan-European consumer segments and their characteristics that allow for a corresponding differentiation strategy within the aquaculture industry. The fact that the segments tend to be uniform across all countries suggests a relatively homogeneous or converging European fish-related culture.

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Longwell, A. Crosby. "Toward cloning aquacultured fish." Reviews in Fisheries Science 5, no. 4 (January 1997): 341–65. http://dx.doi.org/10.1080/10641269709388605.

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Hindar, Kjetil, Nils Ryman, and Fred Utter. "Genetic Effects of Cultured Fish on Natural Fish Populations." Canadian Journal of Fisheries and Aquatic Sciences 48, no. 5 (May 1, 1991): 945–57. http://dx.doi.org/10.1139/f91-111.

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This paper addresses the genetic consequences of aquaculture on natural fish populations. The study is motivated by rapidly increasing numbers of intentionally and accidentally released fish and is based on empirical observations reported in the literature. A wide variety of outcomes, ranging from no detectable effect to complete introgression or displacement, has been observed following releases of cultured fish into natural settings. Where genetic effects on performance traits have been documented, they always appear to be negative in comparison with the unaffected native populations. These findings are consistent with theoretical considerations of the implications of elevated levels of gene flow between cultured and locally adapted natural populations; they raise concerns over the genetic future of many natural populations in the light of increasing numbers of released fish. Strategies for the genetic protection of native populations from the effects of aquaculture are outlined including more secure containment, the use of sterilized fish, and modifying the points of rearing and release. We recommend strong restrictions on gene flow from cultured to wild populations and effective monitoring of such gene flow.

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Harikrishnan, Ramasamy, Chellam Balasundaram, and Moon-Soo Heo. "Fish health aspects in grouper aquaculture." Aquaculture 320, no. 1-2 (October 2011): 1–21. http://dx.doi.org/10.1016/j.aquaculture.2011.07.022.

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Banovic, Marija, Machiel J. Reinders, Anna Claret, Luis Guerrero, and Athanasios Krystallis. "“One Fish, Two Fish, Red Fish, Blue Fish”: How ethical beliefs influence consumer perceptions of “blue” aquaculture products?" Food Quality and Preference 77 (October 2019): 147–58. http://dx.doi.org/10.1016/j.foodqual.2019.05.013.

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Gillanders, Bronwyn M., and Tanya C. Joyce. "Distinguishing aquaculture and wild yellowtail kingfish via natural elemental signatures in otoliths." Marine and Freshwater Research 56, no. 5 (2005): 693. http://dx.doi.org/10.1071/mf04133.

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Naturally occurring elemental signatures (or composition) of otoliths may enable aquaculture and wild-caught yellowtail kingfish (Seriola lalandi) to be distinguished from one another, so that in the event of aquaculture escapes, escaped fish could be identified. Yellowtail kingfish were obtained from aquaculture ventures in three regions of Spencer Gulf and from nine areas external to aquaculture throughout the inner and outer Spencer Gulf, South Australia. Elemental signatures (Mg, Mn, Sr, Ba) of otoliths were analysed via LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry). A highly significant difference was detected between elemental signatures of the aquaculture and wild-caught fish, but this difference was largely attributable to wild fish from Port Augusta being different from the other groupings. For individual elements, it was difficult to detect differences between aquaculture and wild-caught fish, as there was considerable variation between locations within each group. When comparisons between aquaculture and wild fish were made of the inner and outer Spencer Gulf, aquaculture fish could be distinguished from wild fish and classified correctly with a high degree of accuracy (82–100%); the same level of accuracy was not achieved with wild fish. Comparison of elemental transects showed considerable variability between locations, with no features distinguishing aquaculture or wild-caught fish. It would be beneficial to combine naturally occurring signatures with other identification approaches (e.g. artificial elemental signatures) to accurately distinguish aquaculture from wild-caught fish. The impacts of escaped fish could then be determined.

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Da Le, Nhu, Thi Thu Ha Hoang, Vu Phong Phung, Thi Lien Nguyen, Thi Thuy Duong, Le Minh Dinh, Thi Mai Huong Pham, et al. "Trace Metal Element Analysis in Some Seafood in the Coastal Zone of the Red River (Ba Lat Estuary, Vietnam) by Green Sample Preparation and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)." Journal of Analytical Methods in Chemistry 2021 (March 4, 2021): 1–14. http://dx.doi.org/10.1155/2021/6649362.

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Fisheries and aquaculture production in the coastal zone of Vietnam contribute significantly to the national economy. However, seafood quality and safety, especially in terms of metal contents, are of increasing concern, for both domestic and international markets. This paper presents the results of an investigation in some trace metal elements (iron (Fe), zinc (Zn), manganese (Mn), copper (Cu), arsenic (As), cadmium (Cd), and mercury (Hg)) concentrations in some fishes, crustaceans, and molluscs in the coastal zone of the Red River (in the Ba Lat estuary in Thai Binh and Nam Dinh provinces) during four sampling campaigns in 2020. All samples were treated by a green sample preparation using microwave digestion and then analyzed by inductively coupled plasma-mass spectrometry (ICP-MS). The results showed that the trace metal element concentrations in fish, crustacean, and mollusc samples decreased in the following order: Fe > Zn > Mn > Cu > As > Cd ∼ Hg. In more details, the ranges of trace metal elements in seafood samples were 13.13–202.73; 7.63–82.71; 0.48–22.73; 0.72–15.58; 0.18–5.12; 0.001–1.114; and 0.001–0.923 mg·kg−1 for Fe, Zn, Mn, Cu, As, Cd, and Hg, respectively. The research results contribute to the dataset of the seafood (both fishery and aquacultural seafood) quality in the Red River coastal zone. Although the mean values of different trace metal elements observed in this study were lower than the allowed values of Vietnam’s or European’s threshold for food safety, some high concentrations were detected. The survey results suggest the need to expand the monitoring scope (frequency of monitoring, number of samples, and observed variables) for obtaining a fully comprehensive assessment of seafood quality in this region. Our results also indicate that it is necessary to manage water quality in coastal areas, especially where aquaculture activities are carried out.

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Wood, Chris M., and Junho Eom. "The internal CO 2 threat to fish: high P CO 2 in the digestive tract." Proceedings of the Royal Society B: Biological Sciences 286, no. 1907 (July 17, 2019): 20190832. http://dx.doi.org/10.1098/rspb.2019.0832.

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Our goal was to use novel fibreoptic sensors to make the first direct P CO 2 measurements in the digestive tracts of live freshwater fish (anaesthetized, artificially ventilated, 12°C). P CO 2 levels in gastrointestinal fluids were substantially higher than in blood, and were elevated after feeding. In the carnivorous, gastric rainbow trout, the mean P CO 2 in various parts of the tract increased from 7–13 torr (1 torr = 0.1333 kPa) during fasting to 20–41 torr after feeding, relative to arterial levels of 3.5–4 torr. In the agastric, omnivorous goldfish, the mean gut levels varied from 10–13 torr in fasted animals to 14–18 torr in fed animals, relative to arterial levels of 5–7 torr. These elevated P CO 2 values were associated with surprisingly high HC O 3 − concentrations (greater than 40 mmol l −1 ) in the intestinal chyme. Incubations of food pellets with acid or water revealed endogenous P CO 2 generation sufficient to explain gastric P CO 2 in fed trout and anterior intestine P CO 2 in fed goldfish. The impacts of possible equilibration with venous blood draining the tract are assessed. We conclude that fish are already coping with P CO 2 levels in the internal gastrointestinal environment many-fold greater than those of current concern in the external environment for climate change and aquacultural scenarios.

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Kapuscinski, Anne R. "Integration of transgenic fish into aquaculture." Food Reviews International 6, no. 3 (January 1990): 373–88. http://dx.doi.org/10.1080/87559129009540878.

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MAEDA, TOSHIMICHI. "4. Handling and processing of aquacultured fish." NIPPON SUISAN GAKKAISHI 79, no. 2 (2013): 236. http://dx.doi.org/10.2331/suisan.79.236.

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Fernandez-Jover, Damian, Pablo Sanchez-Jerez, Just Tomás Bayle-Sempere, Carlos Valle, and Tim Dempster. "Seasonal patterns and diets of wild fish assemblages associated with Mediterranean coastal fish farms." ICES Journal of Marine Science 65, no. 7 (June 5, 2008): 1153–60. http://dx.doi.org/10.1093/icesjms/fsn091.

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Abstract Fernandez-Jover, D., Sanchez-Jerez, P., Bayle-Sempere, J. T., Valle, C., and Dempster, T. 2008. Seasonal patterns and diets of wild fish assemblages associated with Mediterranean coastal fish farms. – ICES Journal of Marine Science, 65: 1153–1160. Fish are attracted to floating structures, including coastal cage fish farms, sometimes in dense aggregations. To understand better the influence of aquaculture on wild fish stocks, we carried out seasonal visual censuses around three southwestern Mediterranean farms over 2 years to assess the temporal patterns of the aggregated fish assemblage. In addition, we analysed the diet of the five most abundant species. Aggregations around all farms were large throughout the year, although species composition and abundance differed among farms and seasons. Fish farms are attractive habitats for certain species of wild fish in specific seasons. Adult fish of reproductive size dominated the assemblages, and stomach content analysis revealed that 66–89% of fish of the five most abundant taxa had consumed food pellets lost from the cages. We estimated that wild fish consume up to 10% of the pellets used at farms, indicating that food is a key attractant. Regional monitoring of farm-associated wild fish assemblages could aid management of the interaction of aquaculture and wild fish resources, because changes in feeding behaviour may have consequences for fish populations and local fisheries.

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Moreira, Márcio, Denise Schrama, Ana Paula Farinha, Marco Cerqueira, Cláudia Raposo de Magalhães, Raquel Carrilho, and Pedro Rodrigues. "Fish Pathology Research and Diagnosis in Aquaculture of Farmed Fish; a Proteomics Perspective." Animals 11, no. 1 (January 8, 2021): 125. http://dx.doi.org/10.3390/ani11010125.

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One of the main constraints in aquaculture production is farmed fish vulnerability to diseases due to husbandry practices or external factors like pollution, climate changes, or even the alterations in the dynamic of product transactions in this industry. It is though important to better understand and characterize the intervenients in the process of a disease outbreak as these lead to huge economical losses in aquaculture industries. High-throughput technologies like proteomics can be an important characterization tool especially in pathogen identification and the virulence mechanisms related to host-pathogen interactions on disease research and diagnostics that will help to control, prevent, and treat diseases in farmed fish. Proteomics important role is also maximized by its holistic approach to understanding pathogenesis processes and fish responses to external factors like stress or temperature making it one of the most promising tools for fish pathology research.

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Baras, Etienne, and Jean-Paul Lagard�re. "Fish telemetry in aquaculture: review and perspectives." Aquaculture International 3, no. 2 (June 1995): 77–102. http://dx.doi.org/10.1007/bf00117876.

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Turnipseed, Sherri B., Jack J. Lohne, and Joe O. Boison. "Review: Application of High Resolution Mass Spectrometry to Monitor Veterinary Drug Residues in Aquacultured Products." Journal of AOAC INTERNATIONAL 98, no. 3 (May 1, 2015): 550–58. http://dx.doi.org/10.5740/jaoacint.14-265.

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Abstract High resolution MS (HRMS) instruments provide accurate mass measurements. With HRMS, virtually an unlimited number of compounds can be analyzed simultaneously because full-scan data are collected, rather than preselected ion transitions corresponding to specific compounds. This enables the development of methods that can monitor for a wide scope of residues and contaminants in aquacultured fish and shellfish including antibiotics, metabolites, and emerging contaminants. Applications of HRMS to the analysis of veterinary drug residues in aquacultured products are summarized in this review including methods for screening, quantifying, and identifying drug residues in these matrixes. The use of targeted, semi-targeted, and nontargeted analysis of HRMS data and the implications to the global aquaculture industry are also reviewed.

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Muething, KA, F. Tomas, G. Waldbusser, and BR Dumbauld. "On the edge: assessing fish habitat use across the boundary between Pacific oyster aquaculture and eelgrass in Willapa Bay, Washington, USA." Aquaculture Environment Interactions 12 (December 3, 2020): 541–57. http://dx.doi.org/10.3354/aei00381.

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Estuaries are subject to diverse anthropogenic stressors, such as shellfish aquaculture, which involve extensive use of estuarine tidelands. Pacific oyster Crassostrea gigas aquaculture is a century-old practice in US West Coast estuaries that contributes significantly to the regional culture and economy. Native eelgrass Zostera marina also commonly occurs in intertidal areas where oyster aquaculture is practiced. Eelgrass is federally protected in the USA as ‘essential fish habitat’, restricting aquaculture activities within or near eelgrass. To contribute scientific information useful for management decisions, we sought to compare fish habitat use of oyster aquaculture and eelgrass, as well as the edges between these 2 habitats, in Willapa Bay, Washington, USA. Furthermore, given a recent shift towards off-bottom culture methods, in part to protect seagrasses, long-line and on-bottom oyster aquaculture habitats were compared. A combination of direct (underwater video, minnow traps) and indirect (predation tethering units, eelgrass surveys) methods were employed to characterize differences in fish habitat use. Eelgrass density declined within both aquaculture habitats but less so within long-line aquaculture. Most fish species in our study used long-line oyster aquaculture and eelgrass habitats similarly with minimal edge effects, and on-bottom aquaculture was used less than either of the other 2 habitat types. These results are consistent with previously observed positive relationships between fish abundance and vertical habitat structure, but also reveal species-specific behavior; larger mesopredators like Pacific staghorn sculpins were sighted more often in aquaculture than in interior eelgrass habitats.

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Winfield, Ian J. "CLEANER FISH BIOLOGY AND AQUACULTURE APPLICATIONS." Journal of Fish Biology 93, no. 5 (November 2018): 1027. http://dx.doi.org/10.1111/jfb.13830.

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SABRY, MAHA, KHALED ABD EL-MOEIN, EMAN HAMZA, and FATMA ABDEL KADER. "Occurrence of Clostridium perfringens Types A, E, and C in Fresh Fish and Its Public Health Significance." Journal of Food Protection 79, no. 6 (June 1, 2016): 994–1000. http://dx.doi.org/10.4315/0362-028x.jfp-15-569.

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ABSTRACT Fish remains among the most traded of food commodities, and Egypt is one of the emerging countries being recognized as an important world fish exporter. Clostridium perfringens is an important foodborne pathogen to consider in fish trade, as it has been implicated as the causative organism of two fish outbreaks. The aim of the present study was to investigate the occurrence and toxin diversity of C. perfringens associated with fresh and canned fish and to examine the public health significance of C. perfringens infection in fish. Isolation and identification of C. perfringens showed a significantly higher prevalence of the bacterium in fresh fish collected from aquaculture (54.5%) and from markets (71%) as well as in humans in contact with fish (63%) compared with water used for keeping fresh fish (27.3%) and water used in canned fish (17.8%). The isolation level was significantly higher in samples from the external surface of fresh fish (31.8% in aquaculture, 45.6% in markets) than from the intestinal contents of the same fish (9.1% in aquaculture, 6.7% in markets). Thus, markets represent a risk factor for contamination of the external surface of fish from the surrounding environment. Genotyping of the C. perfringens–positive isolates by using multiplex PCR revealed that type A enterotoxin-negative (CPE−) is the predominant strain among fish (fresh and canned), humans, and water in contact with fresh fish. Interestingly, C. perfringens types A enterotoxin-positive (CPE+) and C were found only in fresh fish, and these two strains have great health importance in humans. Strikingly, C. perfringens type E strain was detected for the first time in fish, humans, and water in contact with fresh fish. Our results demonstrate for the first time that fish act as a reservoir for C. perfringens, particularly for types A CPE+, C, and E. The external surface of fish represents a vehicle for contamination of fish from the surrounding environment as well as a source of infection of humans, thereby representing a public health hazard.

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Silva, Fabricio Nilo Lima da, Raoani Cruz Mendonça, Manoel Luciano Aviz de Quadros, Luã Caldas de Oliveira, Osnan Lennon Lameira Silva, Antônia Rafaela Gonçalves Macedo, Lenilton Alex de Araujo Oliveira, Fernanda Praia Costa, Antony Correa Paes, and Aracy Sá Pereira. "Good management practices course and social technologies for aquaculture farmers in Marajó, Pará, Brazil." Revista Ibero-Americana de Ciências Ambientais 11, no. 4 (April 27, 2020): 49–58. http://dx.doi.org/10.6008/cbpc2179-6858.2020.004.0004.

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The objective of this study was capacitate aquaculture farmers and develop social technologies for the culture of tambaqui (Colossoma macropomum) in the archipelago of Marajó (Pará - Brazil). The study was carried out in the municipality of Curralinho by the Federal Institute of Education, Science and Technology of Pará (IFPA) Campus Breves, in March 2020. Two structured questionnaires were applied to 13 course participants who participated in the training. The first was before the course, about fish farming and the adoption of Good Management Practices (BPM) adopted by aquaculture farmers in the Marajó region. The second, composed of closed questions to evaluate the training course, whose themes were: 1) water quality, 2) indicated species, 3) fish transport management, 4) fish quarantine and stock, 5) fish biometrics, 6) liming and fertilizing ponds, 7) management of fish nutrition and health, and 8) fish harvesting and slaughter, were approached in the course. At the end of the lectures / training, a workshop for the production of social technologies was conducted, among students, teachers and aquaculture farmers. Previous knowledge about fish farming and the adoption of BPM were essential for the effectuation of the course. Issues about water quality, biometrics and fish nutrition and health were the ones that called the most attention from aquaculture farmers. Secchi's disk, ichthyometer, hand net and net-tank were the social technologies built. Post-course evaluation was essential to understand the impact of the socialization of knowledge provided to the community. In conclusion, the project reinforced teaching, research and extension actions, involving the community in favor of strengthening aquaculture in the Marajó island, Pará, Brazil.

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Kok, Björn, Wesley Malcorps, Michael F. Tlusty, Mahmoud M. Eltholth, Neil A. Auchterlonie, David C. Little, Robert Harmsen, Richard W. Newton, and Simon J. Davies. "Fish as feed: Using economic allocation to quantify the Fish In : Fish Out ratio of major fed aquaculture species." Aquaculture 528 (November 2020): 735474. http://dx.doi.org/10.1016/j.aquaculture.2020.735474.

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Chandararathna, Uthpala, Martin Hugo Iversen, Kjetil Korsnes, Mette Sørensen, and Ioannis N. Vatsos. "Animal Welfare Issues in Capture-Based Aquaculture." Animals 11, no. 4 (March 30, 2021): 956. http://dx.doi.org/10.3390/ani11040956.

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Capture-based aquaculture (CBA) represents a type of intensive aquaculture production system for some economically valuable fish species, such as bluefin tuna (Thunnus thynnus), eel (Anguilla spp.) and Atlantic cod (Gadus morhua). In CBA, fish are captured from the wild in certain periods of the year, and following a recovery phase, they are kept in rearing facilities for a period of time, until they reach the market size. In this case, the fish are wild and have not gone through domestication like other fish species that are reproduced and farmed under the established farming systems. Therefore, these fish are not genetically adapted to live under the intensive farming conditions, and thus their welfare may be compromised in different manners compared to their domesticated counterparts. This review presents an overview of the current situation of CBA, while focusing on the assessment of fish welfare in CBA. The most commonly used fish welfare indicators will be discussed in relation to the different stages of CBA.

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Castell, John. "Farming the waters: Bringing aquatic plant and animal species to agriculture." Canadian Journal of Animal Science 80, no. 2 (June 1, 2000): 235–43. http://dx.doi.org/10.4141/a99-102.

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Aquaculture has a long history, with carp culture in Asia starting before 2000 BC and oyster culture in the Roman Empire before the time of Julius Caesar. However, it is clearly the past 40 yr that have seen the most dramatic expansion of aquaculture. The world's population now exceeds 6 billion people and is still growing at an alarming rate. The world's wild fish harvest has clearly peaked at or above the maximum sustainable yield of about 90 million t. Many fish stocks are suffering from over-fishing and there is little hope of any increase in the capture fisheries production. Though modern agricultural practices have been very efficient at increasing the per acre yields, the world is experiencing an alarmingly steady decrease in the amount of agricultural land devoted to food production. In the past 20–30 yr production of fish, molluscs, crustaceans and aquatic plants (aquaculture) has become an increasingly important means of producing food, and in some countries aquaculture production accounts for more than half of the total fishery harvest and is even as high as 90% in a few countries. I have reviewed the historical growth of aquaculture, compared the product value in various countries and reviewed aquaculture practices for a number of plant, molluscan, crustacean and fish species around the world. These culture technologies were compared and contrasted with agricultural practices. Finally, some predictions for the future of aquaculture development in Canada and the world have been made. Key words: Canadian aquaculture, history, salmon, fish farming, production statistics, fish culture technology

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Rumbos, Christos I., Eleni Mente, Ioannis T. Karapanagiotidis, Georgios Vlontzos, and Christos G. Athanassiou. "Insect-Based Feed Ingredients for Aquaculture: A Case Study for Their Acceptance in Greece." Insects 12, no. 7 (June 28, 2021): 586. http://dx.doi.org/10.3390/insects12070586.

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Although the inclusion of insects in fish diets is officially allowed in the EU since 2017, insect-based aquafeeds have not been widely adopted by the European aquaculture sector. In order to investigate the perceptions related with adoption trends, it is critical to explore the beliefs of people associated with the aquaculture sector on the use of insects in farmed fish diets. A survey was conducted among 228 participants of an aquaculture conference to explore their perceptions on the inclusion of insect meal in fish diets. Additionally, we investigated the attitudes of nine companies operating in the aquaculture and aquafeed sector in Greece that attended the conference towards this direction. The findings of the conference survey provide evidence that there is a wide-range awareness and acceptance regarding the use of insect-based feeds in farmed fish diets among the respondents. This is mainly driven by the expectations for the decline in fishing pressure on wild fish stocks, the reduction of the ecological footprint and the enhancement of the sustainability of the aquaculture sector. The results of the stakeholder survey show that six out of the nine companies that participated in the survey are favorably disposed towards the use of insect-based feeds. Specifically, four of them stated that they would produce or use aquafeeds based on insects. However, the results highlight the need for further research on the implementation of the wider adoption of insect-based feeds in aquaculture. The present study provides some first insights into the use of insect-based aquafeeds in Greece, for which there are no data available.

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Ruzauskas, Modestas, Julija Armalytė, Eglė Lastauskienė, Rita Šiugždinienė, Irena Klimienė, Raimundas Mockeliūnas, and Elena Bartkienė. "Microbial and Antimicrobial Resistance Profiles of Microbiota in Common Carps (Cyprinus carpio) from Aquacultured and Wild Fish Populations." Animals 11, no. 4 (March 25, 2021): 929. http://dx.doi.org/10.3390/ani11040929.

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In this study we analyzed differences in microbial composition and antimicrobial resistance profiles in common carp living in two different environments: fish ponds, where carp have been kept under the same growing conditions over the last 50 years, and from the wild. The results demonstrated that wild fish carry a great variety of bacterial species (448 species with a prevalence of at least 0.01% from the total number of reads). Aquacultured individuals harbored 2.56 times fewer species in their gut. Significant microbial differences were observed in all taxonomic ranks, including bacterial classes and phyla. Besides bacterial variety, it was determined that aquacultured fish harbored more bacteria that are considered pathogens or opportunistic pathogens, such as Moraxellaceae, Flavobacteriaceae, and Staphylococcaceae. The frequency of antimicrobial resistance in bacterial indicators was more common in aquacultured fish than in wild fish, therefore fish farming may be a potential source of environmental contamination with antimicrobial resistant bacteria.

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DANG, SON THI THANH, and ANDERS DALSGAARD. "Escherichia coli Contamination of Fish Raised in Integrated Pig-Fish Aquaculture Systems in Vietnam." Journal of Food Protection 75, no. 7 (July 1, 2012): 1317–19. http://dx.doi.org/10.4315/0362-028x.jfp-11-501.

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Integrated livestock-fish aquaculture utilizes animal excreta and urine as pond fertilizers to enhance growth of plankton and other microorganisms eaten by the fish. In Vietnam, pigs are commonly integrated with fish and horticulture in household-based VAC systems (vuon = garden; ao = pond; chuong = pigsty), but the level of fecal contamination in the fish produced is unknown. This study was carried out to assess the level Escherichia coli contamination of fish meat and gut contents of grass carp (Ctenopharyngodon idellus), silver carp (Hypophthalmichthys molitrix), and rohu (Labeo rohita) cultured in randomly selected five VAC ponds (with pig manure) and five non-VAC ponds (without pig manure) at sites in periurban Hanoi, Vietnam. Fish muscle tissue samples contained E. coli at <10 or 320 or 820 CFU/g, regardless of the culture system from which they originated. In contrast, the intestinal contents of fish raised in manure-fed ponds contained E. coli at 4.75, 5.25, and 5.07 log CFU/g for silver carp, grass carp, and rohu, respectively, about 100 times higher than the contamination of fish from the control ponds. The results indicate that muscle tissue of fish raised in VAC systems has a low level of fecal contamination despite high levels of E. coli in their gut. Thus, a critical point to control food safety of such fish is the prevention of fecal cross-contamination during degutting and cleaning of the fish at markets and in the home.

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Boison, Joe O., and Sherri B. Turnipseed. "A Review of Aquaculture Practices and Their Impacts on Chemical Food Safety from a Regulatory Perspective." Journal of AOAC INTERNATIONAL 98, no. 3 (May 1, 2015): 541–49. http://dx.doi.org/10.5740/jaoacint.15-033.

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Abstract Aquaculture is currently one of the most rapidly growing food production industries in the world. The increasing global importance for this industry stems primarily from the fact that it is reducing the gap between the supply and demand for fish products. Commercial aquaculture contributes significantly to the economies of many countries since high-value fish species are a major source of foreign exchange. This review looks at the aquaculture industry, the issues raised by the production of fish through aquaculture for food security, the sustainability of the practice to agriculture, what the future holds for the industry in the next 10-20 years, and why there is a need to have available analytical procedures to regulate the safe use of chemicals and veterinary drugs in aquaculture.

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Olaoye, Olalekan Jacob, Godfrey Nnamdi Onyenoro Ezeri, Yemi Akegbejo-Samsons, Joseph Mubo Awotunde, and Wahab Gbenga Ojebiyi. "Dynamics of the adoption of improved aquaculture technologies among fish farmers in Lagos State, Nigeria." Croatian Journal of Fisheries 74, no. 2 (June 1, 2016): 56–70. http://dx.doi.org/10.1515/cjf-2016-0012.

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AbstractThe study assessed the adoption of improved aquaculture technologies among fish farmers in Lagos State, Nigeria. A total of 90 fish farmers were sampled through the multistage sampling technique. A validated and pretested interview schedule was used to obtain primary information from the fish farmers. Obtained data were analyzed using descriptive and inferential statistics. Results obtained revealed that more than half and about one-third of the fish farmers sourced credit facilities from cooperative societies and Esusu, respectively, while almost all sold their fishes as smoked fish. Higher proportions of the fish farmers were aware, tried and adopted most of the improved aquaculture technologies with some of the fish farmers also discontinuing most of the previously adopted technologies. The findings of the study also reported that the fish farmers had positive attitude towards the adoption of improved aquaculture technologies. Results of regression analysis revealed that secondary occupation of the fish farmers (β=−0.324, p<0.01), annual income level (β=−0.471, p<0.05), cost of pond construction (β=0.477, p<0.05) and total profit realized (β=−0.466, p<0.05) were significant predictors of the adoption of improved technologies by the fish farmers with an R2 implying that 46.0% of the variability in the fish farmers’ adoption of improved aquaculture technologies is explained by the socio-economic and production characteristics of the fish farmers. The study concluded that the adoption of improved aquaculture technologies is dynamic and highly influenced by the socio-economic characteristics of the fish farmers which also change with time. It is therefore recommended that technologies that received low level of adoption or which discontinued after earlier adoption should be worked on so that the adoption of those technologies would translate to increased income level of fish farmers, reduced cost of pond construction and increased profit of the fish farmers.

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Weir, Laura K., and James WA Grant. "Effects of aquaculture on wild fish populations: a synthesis of data." Environmental Reviews 13, no. 4 (December 1, 2005): 145–68. http://dx.doi.org/10.1139/a05-012.

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The potential adverse environmental effects of aquaculture have been the subject of considerable attention in both the media and the scientific literature. We undertook a synthesis of the published scientific literature, primarily concerning Atlantic salmon (Salmo salar), to assess the current data available regarding these potential effects. No data are available to test for the direct effects of aquaculture organisms on the demographics of wild fish populations. However, seven studies show that escaped salmon in the wild have lower fitness, as measured by survival and reproductive success, than native salmon. Thirteen other studies, encompassing 91 different traits, provide strong evidence of phenotypic differences between farmed and wild salmon, presumably because of artificial selection in the aquaculture environment. An additional 10 studies have documented significant genetic differences between farmed salmon and the wild fish with which they will interact, or potentially interact. Given the paucity of data regarding actual population consequences of escaped farmed fish on wild populations, and the documented differences between the two types of fish, it seems prudent to treat farmed fish as exotic species with potentially negative consequences for wild populations, particularly when the latter are of conservation concern.Key words: aquaculture, Atlantic salmon, artificial selection, fitness, introgression.

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Kirkpatrick, Jamie B., Lorne K. Kriwoken, and Jennifer Styger. "The reverse precautionary principle: science, the environment and the salmon aquaculture industry in Macquarie Harbour, Tasmania, Australia." Pacific Conservation Biology 25, no. 1 (2019): 26. http://dx.doi.org/10.1071/pc17014.

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Science is frequently used by opposing sides in environment–development debates. Scientific input from an environmental perspective can be inhibited if those in favour of development control research funding. We test whether such a situation can result in outcomes desired by neither of the protagonists, and seek to identify how negative outcomes can be avoided, using the example of fish farming in Macquarie Harbour, Tasmania. A marked decline in dissolved oxygen (DO) at 19–21m depth in Macquarie Harbour, Tasmania, occurred between 2009 and 2011. DO continues to be low. DO change was associated with changes in the benthic biota, with effects extending from fish farms into the Tasmanian Wilderness World Heritage Area and threatening a Tasmanian endemic fish. The reverse precautionary response of industry and government was to undertake further research because the causes of the changes were not fully understood. We present simple graphs and analyses that suggest that the only substantial predictor of benthic DO reduction is fish production from marine farms, with variability in discharge, catchment rainfall, wind speed, sea surface temperatures and sea level pressure having no effect. Adaptive management of fish farming in Macquarie Harbour seems to require an estuary-wide approach rather than the current attention to the effects of single pens. The broader implications of the case study are that the science related to the environmental impacts of an industry needs to be undertaken by scientists in secure positions funded independently of industry and government.

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ellis, jim, nick dulvy, carl o'brien, david sims, and emily southall. "foreword shark, skate and ray research at the mba and cefas." Journal of the Marine Biological Association of the United Kingdom 85, no. 5 (October 2005): 1021–23. http://dx.doi.org/10.1017/s0025315405012087.

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for many decades, scientists at the marine biological association (mba) in plymouth and the centre for environment, fisheries and aquaculture science (cefas), formerly the directorate of fisheries research, at lowestoft have undertaken considerable research into the ecology and life histories of elasmobranch fish around the british isles.

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Hindar, Kjetil, Nils Ryman, and Fred Utter. "Genetic effects of aquaculture on natural fish populations." Aquaculture 98, no. 1-3 (October 1991): 259–61. http://dx.doi.org/10.1016/0044-8486(91)90389-o.

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Polymeros, Konstantinos, Eleni Kaimakoudi, Maria Schinaraki, and Christos Batzios. "Analysing consumers’ perceived differences in wild and farmed fish." British Food Journal 117, no. 3 (March 2, 2015): 1007–16. http://dx.doi.org/10.1108/bfj-12-2013-0362.

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Purpose – The purpose of this paper is to investigate consumers’ attitudes and behaviours towards wild and farmed fish, in order to identify possible distinct consumer groups, and to examine potential linkages between characteristics of the consumers’ demographic and socio-economic status and marketing aspects in wild and farmed fish. Design/methodology/approach – Using data from an in-person field survey, a TwoStep cluster analysis was employed in order to detect perceived differences among consumers with different profiles. Findings – The analysis identified two distinct consumer groups differentiated primarily by income: the low-potential aquaculture consumers and the high-potential aquaculture consumers, representing 67 and 33 per cent of the total sample, respectively. The study provides evidence that there is a lesser preference towards farmed fish. Therefore, more efficient marketing strategies are probably needed in order to promote awareness in aquaculture consumption, and potentially contribute in guiltlessness of the whole sector. Originality/value – There is a lack of detailed empirical research regarding consumer perceptions and particularly potential differentiation for wild and farmed fish. This paper advocates the use of consumer profiles as a basis for the development of consumer-focused strategies in order to improve consumer performance in the sector.

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Meinertz, Jeffery R., Guy R. Stehly, and William H. Gingerich. "Liquid Chromatographic Determination of Oxytetracycline in Edible Fish Fillets from Six Species of Fish." Journal of AOAC INTERNATIONAL 81, no. 4 (July 1, 1998): 702–8. http://dx.doi.org/10.1093/jaoac/81.4.702.

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Abstract The approved use of oxytetracycline (OTC) in U.S. aquaculture is limited to specific diseases in salmonids and channel catfish. OTC may also be effective in controlling diseases in other fish species important to public aquaculture, but before approved use of OTC can be augmented, an analytical method for determining OTC in fillet tissue from multiple species of fish will be required to support residue depletion studies. The objective of this study was to develop and validate a liquid chromatographic (LC) method that is accurate, precise, and sensitive for OTC in edible fillets from multiple species of fish. Homogenized fillet tissues from walleye, Atlantic salmon, striped bass, white sturgeon, rainbow trout, and channel catfish were fortified with OTC at nominal concentrations of 10, 20, 100,1000, and 5000 ng/g. In tissues fortified with OTC at 100,1000, and 5000 ng/g, mean recoveries ranged from 83 to 90%, and relative standard deviations (RSDs) ranged from 0.9 to 5.8%. In all other tissues, mean recoveries ranged from 59 to 98%, and RSDs ranged from 3.3 to 20%. Method quantitation limits ranged from 6 to 22 ng/g for the 6 species. The LC parameters produced easily in teg ratable OTC peaks without coelution of endogenous compounds. The method is accurate, precise, and sensitive for OTC in fillet tissue from 6 species of fish from 5 phylogenetically diverse groups.

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Journal articles on the topic 'Fish and Aquacultural Science'

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