Journal articles: 'Hatchery management'

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Hartati, Hartati, Jayadi Jayadi, and Andi Tamsil. "EVALUASI PENERAPAN MANAJEMEN CARA PEMBENIHAN IKAN YANG BAIK (CPIB) PADA UNIT PEMBENIHAN UDANG DINAS KELAUTAN DAN PERIKANAN PROVINSI SULAWESI SELATAN DI BOJO KABUPATEN BARRU." JOURNAL OF INDONESIAN TROPICAL FISHERIES (JOINT-FISH) : Jurnal Akuakultur, Teknologi Dan Manajemen Perikanan Tangkap, Ilmu Kelautan 2, no. 2 (December 29, 2019): 206–15. http://dx.doi.org/10.33096/joint-fish.v2i2.54.

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Evaluation of the implementation of good management of fish hatchery (CPIB) at the shrimp hatchery unit of the Departmen of marine and fishery in south Sulawesi province in Bojo, Barru regensy. This research was conducted in February 2019 until April 2019 at the shrimp hatchery until of the Departmen of Marine and Fisheries in south Sulawesi in Bojo, Barru regency. The hatchery unit is a barometer of other shrimp hatcheries in Barru regency in particular and those in South Sulawesi province in general. Based on the results of research using the analysis method (t test) and linear regression shows that the implementation of good management of fish hatchery (CPIB) has an excellent effect on shrimp seed production and internal management factors that affect almost 70% of successful seed production are water quality management, master management, feed management, larvae management and personnel management and the remaining around 30% of production is influenced by external factors such as environment and others. To increase the production of shrimp seed in hatchery units, is it necessary to seek for adjustments and performance enhancements and still be giuded by the method of good hatchery (CPIB) in implementing the 5 production management steps as internal factors greatly determine the success level of seed production both in quantity and quality. Keyword : Shrimp hatchery, regulation, implementation, managemen CPIB

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Stefansson, Sigurd O. "Fish Hatchery Management, Second Edition." Fish and Fisheries 4, no. 4 (December 2003): 372–73. http://dx.doi.org/10.1046/j.1467-2979.2003.0139b.x.

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Phelps, Ronald P. "Recent advances in fish hatchery management." Revista Brasileira de Zootecnia 39, suppl spe (July 2010): 95–101. http://dx.doi.org/10.1590/s1516-35982010001300011.

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The advancement of aquaculture has often been bottlenecked because of the lack of seed, but once that bottleneck was overcome there was rapid growth. Recent examples of advances in hatchery technology leading to increased production are sea bream and Pangasius. Three areas contributing to the advancement of hatchery management are: brood stock management, induced spawning and larval feeding. Formulated diets have been developed for marine brood fish that are equal or better than the traditional raw fish diets. The importance of lipids and their composition in brood fish diets, particularly n-3 HUFAs has received much attention. The lipid composition of the brood diet is reflected in egg composition and egg quality. Protein quantity and quality in brood diets also impacts reproductive success and egg quality. The use of Gonadotropin-releasing hormone agonists (GnRHa) given as an injection or a slow release implant for induced spawning is becoming more widely used. The addition of dopamine antagonists with GnRHa may not be necessary to successfully induce spawn some species of fish. The use of GnRHa can advance the maturation of oocytes allowing such fish to be successfully induced spawned. Significant advances have been made in the development of formulated microdiets for larval fish. Such microdiets have been used successfully with young larvae reducing the need for live foods such as artemia. The quality of both live foods and formulated diets has been enriched with the use of fatty acids. Not only the quantity of n-3 HUFAs added to a diet impacts larval growth and survival but the ratios of specific n-3 HUFAs has an impact. Enrichment of live foods with amino acids can also improve larval fish growth and survival.

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Lazarov, Iliqn, Georgi Zhelev, Mihni Lytzkanov, Koycho Koev, and Vladimir Petrov. "Dynamics of microbial contamination in a poultry hatchery." Archives of Veterinary Medicine 11, no. 1 (September 16, 2018): 37–44. http://dx.doi.org/10.46784/e-avm.v11i1.15.

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The hatcheries may become contaminated with pathogenic bacteria which could spread in the hatchery through the air. That is why the implementation of an effective cleaning and disinfection program and the maintenance of good hygiene are extremely important for the normal course of production and for reducing the spread of infectious agents. In this study, data on the degree and dynamics of bacterial contamination in a poultry hatchery are presented. In the incubation sector, bacterial contamination on the surfaces was found to be low-level ranging from 0.25 to 4.43x101 CFU/ cm2 but in the air it was strongly influenced by the hatching. In the hatchery sector, bacterial contamination on the surface and in the air was high, with the highest values found on the egg shells (1.77x106 CFU/cm2), on the floor (3.2x104 CFU/cm2) and in the air (1.77x105 CFU/cm3) of hatcher cabinets during hatching. The results obtained show that the most important source of microbial contamination in the hatchery is the hatchery sector, especially during hatching, when highly contaminated materials as fluff, shells and dried secretions are released. In case of poor organization of working process, the bacteria could spread by air and contaminate the other sectors of the hatchery. The study confirms the importance of a different approach in the development of preventive measures, depending on the degree of risk in different zones in the hatchery, which is the basis for the effective management practice aimed at decreasing microbiological hazards in hatcheries.

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MORI, KOH-ICHIRO, and KEIICHI MUSHIAKE. "Control of hatchery diseases by broodstock management." NIPPON SUISAN GAKKAISHI 72, no. 2 (2006): 246–49. http://dx.doi.org/10.2331/suisan.72.246.

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Kasai, Hisae, and Jun Nagata. "Hygiene Practices for Aquaculture and Hatchery Management." Fish Pathology 55, no. 4 (January 15, 2021): 111–16. http://dx.doi.org/10.3147/jsfp.55.111.

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Rahman, Md Habibur, Md Anisur Rahman, Md Mer Mosharraf Hossain, Syeda Maksuda Yeasmin, and Abdulla Al Asif. "Effect of feeding management of broodstock on breeding performance of bata (Labeo bata)." Asian Journal of Medical and Biological Research 1, no. 3 (February 23, 2016): 553–68. http://dx.doi.org/10.3329/ajmbr.v1i3.26479.

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Labeo bata is one of the important minor carps in Bangladesh with great demand as good table fish. The study was conducted to observe the breeding performance at different management practices in Mafatema, Rupali, Modhumoti and Anan fish hatchery and disinfection treatments of water, eggs and fry in Jessore, Bangladesh during 10 March 2014 to 15 May 2015. An improvement in broodstock nutrition and feeding has been shown to greatly improve seed production. Protein and lipid percentage of broodstock diet have been identified as major dietary factors. Protein level was 24.77%, 23.47%, 18.08%, 17.78% and lipid level was 11.07%, 9.50%, 7.74%, 8.14% in Mafatema, Rupali, Modhumoti and Anan fish hatchery respectively. Three concentrations of four chemical-formalin (10, 20, 30 mg/L), malachite green (1, 3, 5 mg/L), NaCl (1, 2, 3 g/L) and methylene blue ( 1, 3, 5 mg/L) treatment regimes and a control were compared for efficacy in treating L. bata eggs to prevent fungus and bacterial infection and improve hatch and survival rate of fry. Highest correlation value between absolute fecundity and body weight (r=.938, p<.05) and total length (r=.891, p<.05) and gonadosomatic index (26.2%) were found in Mafatema fish hatchery among four experimental hatcheries at 24.77% protein and 11.07% lipid level. Better fertilization rate (84.2±5.17%) and hatching rate (82.0±4.30%) were found in Mafatema and Rupali fish hatchery respectively that has significant difference (P<0.05) from that of Modhumoti and Anan fish hatchery at higher protein and lipid level. Lowest deformity rate (6.05+2.65) was observed in Mafatema fish hatchery that was significantly different (P<0.05) from that of Modhumoti fish hatchery. In case of disinfection treatment, methylene blue at 1mg/L bath treatment daily for 4 days showed significantly higher hatching rate (92.33±3.51%) and survival rate (94.33±4.73%).Asian J. Med. Biol. Res. December 2015, 1(3): 553-568

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Anderson, Richard. "New Approaches for Management of Fertilized Hatchery Ponds." Journal of Applied Aquaculture 2, no. 3-4 (January 18, 1994): 1–8. http://dx.doi.org/10.1300/j028v02n03_01.

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Hayes, Michael C., Reginald R. Reisenbichler, Stephen P. Rubin, Deanne C. Drake, Karl D. Stenberg, and Sewall F. Young. "Effectiveness of an integrated hatchery program: can genetic-based performance differences between hatchery and wild Chinook salmon be avoided?" Canadian Journal of Fisheries and Aquatic Sciences 70, no. 2 (February 2013): 147–58. http://dx.doi.org/10.1139/cjfas-2012-0138.

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Performance of wild (W) and hatchery (H) spring Chinook salmon (Oncorhynchus tshawytscha) was evaluated for a sixth generation hatchery program. Management techniques to minimize genetic divergence from the wild stock included regular use of wild broodstock and volitional releases of juveniles. Performance of HH, WW, and HW (hatchery female spawned with wild male) crosses was compared in hatchery and stream environments. The WW juveniles emigrated from the hatchery at two to three times the rate of HH fish in the fall (HW intermediate) and 35% more HH than WW adults returned (27% more HW than WW adults). Performance in the stream did not differ statistically between HH and WW fish, but outmigrants (38% WW, 30% HW, and 32% HH fish) during the first 39 days of the 16-month sampling period composed 74% of total outmigrants. Differences among hatchery-reared crosses were partially due to additive genetic effects, were consistent with domestication (increased fitness for the hatchery population in the hatchery program), and suggested that selection against fall emigration from the hatchery was a possible mechanism of domestication.

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Digun-Aweto, Oghenetejiri, and Ademuyiwa Hafiz Oladele. "Awareness of Improved Hatchery Management Practices among Fish Farmers in Lagos State." Agricultura Tropica et Subtropica 50, no. 1 (March 1, 2017): 19–25. http://dx.doi.org/10.1515/ats-2017-0003.

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Abstract During the last decade, hatchery infrastructure and table fish production systems have been exclusively targeted towards catfish production in Nigeria. These efforts have not translated to sufficient domestic fish production. The shortfall in demand for fish fry and fingerlings by growing population of fish farms in Lagos State confirms the fish seed production deficiency. This study investigated the level of awareness of improved hatchery management practices among fish farmers in Lagos State. Using simple random sampling method, 150 fish farmers from 12 local government areas of Lagos State were selected and interviewed using a structured questionnaire. The majority of the respondents were male (68 %) and married (76.6 %), with dominant age range of 41–50 years (55.3 %) and a farming experience of 5–10 years (68 %). Personal saving (46.7 %) and cooperative societies (31.3 %) were the respondents’ main sources of fund and fortnight visits by extension agent was of commonest frequency (86 %). Extension agents and research institutes ranked first and second, respectively, among the sources of information, and accounted for the main sources of information to the farmers. The farmers either strongly agreed or agreed on almost all the hatchery management practices, while they expressed their need for advisory and input support services from government and non-governmental organizations. The significant relationship which exists between age and marital status, and farmers’ awareness shows that greater communication of improved hatchery management practices will lead to adoption, thereby increasing the output of the farmers. Improved hatchery output will lead to greater availability of fish seeds for table size production as well as greater income to the fish farmers. In addition to more intensive extension efforts, other channels of information notably mass media should be revitalized in delivering improved management practices to the fish farmers.

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Fisch, Kathleen M., Christine C. Kozfkay, Jamie A. Ivy, Oliver A. Ryder, and Robin S. Waples. "Fish Hatchery Genetic Management Techniques: Integrating Theory with Implementation." North American Journal of Aquaculture 77, no. 3 (June 19, 2015): 343–57. http://dx.doi.org/10.1080/15222055.2014.999846.

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Sobota, Aldona, Piotr Zarzycki, Anna Wirkijowska, Zbigniew Rzedzicki, and Agnieszka Pawlas. "Application of extrusion-cooking technology in hatchery waste management." Open Life Sciences 15, no. 1 (August 13, 2020): 572–79. http://dx.doi.org/10.1515/biol-2020-0065.

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AbstractThe purpose of the present study was to examine the extrusion-cooking process of cereal blends with addition of hatchery waste (HW). The effect of HW addition on the physical properties and chemical composition of the extrudates was examined. The share of the HW in blends with corn meal was variable in the range of 5–30%. The study was conducted using a counter-rotating twin-screw extruder (L:D ratio 12:1, screw speed 75 rpm, die diameters 3 mm × 6 mm, profile of barrel temperature 120/140/180/180/130°C, and material moisture 28%). Increase in the content of the HW from 5 to 30% reduced the expansion ratio, pellet durability index, water absorption index, and water solubility index of the extrudates. The microstructure of the extrudates with HW addition is non-homogeneous; the areas with densely packed and adherent granules, interwoven with fibrous structures, can be observed. Increase in the share of HW leads to a lowering of the levels of crude fiber and total dietary fiber in the extrudates. Moreover, a significant increase in the content of protein, crude fat, and mineral elements such as calcium, sodium, magnesium, and iron was observed.

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Beacham, Terry D., Kim Jonsen, Brenda McIntosh, Ben J. G. Sutherland, David Willis, Cheryl Lynch, and Colin Wallace. "Large-scale parentage-based tagging and genetic stock identification applied in assessing mixed-stock fisheries and hatchery brood stocks for coho salmon in British Columbia, Canada." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 9 (September 2020): 1505–17. http://dx.doi.org/10.1139/cjfas-2020-0035.

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Direct DNA sequencing is powering a revolution in the application of genetics to resource management, with parentage-based tagging (PBT) increasingly applied to salmon fisheries and hatchery brood stock management and assessment. Genetic stock identification (GSI) and PBT were applied to assessment of 2018 coho salmon (Oncorhynchus kisutch) ocean fisheries and hatchery brood stocks in British Columbia (BC), Canada, with 6391 individuals successfully genotyped in fishery samples and 7805 individuals genotyped in 40 hatchery brood stocks. Population-specific contributions to mixed-stock fisheries and exploitation rates were estimated with coded-wire tags (CWTs) and GSI–PBT technologies for six populations. PBT assignments, verified by CWTs, were 100% accurate for 308 individuals with respect to population of origin and age. There was generally reasonably close agreement of estimated population-specific exploitation rates between CWT and genetic methods. We conclude that a genetic approach can improve upon the results available from the current CWT program for assessment and management of coho salmon fisheries and hatchery brood stocks in BC and provide information critical to aid in implementation of Canada’s Policy for Conservation of Wild Pacific Salmon.

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Le Luyer, Jérémy, Martin Laporte, Terry D. Beacham, Karia H. Kaukinen, Ruth E. Withler, Jong S. Leong, Eric B. Rondeau, Ben F. Koop, and Louis Bernatchez. "Parallel epigenetic modifications induced by hatchery rearing in a Pacific salmon." Proceedings of the National Academy of Sciences 114, no. 49 (November 21, 2017): 12964–69. http://dx.doi.org/10.1073/pnas.1711229114.

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Wild stocks of Pacific salmonids have experienced sharp declines in abundance over the past century. Consequently, billions of fish are released each year for enhancing abundance and sustaining fisheries. However, the beneficial role of this widely used management practice is highly debated since fitness decrease of hatchery-origin fish in the wild has been documented. Artificial selection in hatcheries has often been invoked as the most likely explanation for reduced fitness, and most studies to date have focused on finding signatures of hatchery-induced selection at the DNA level. We tested an alternative hypothesis, that captive rearing induces epigenetic reprogramming, by comparing genome-wide patterns of methylation and variation at the DNA level in hatchery-reared coho salmon (Oncorhynchus kisutch) with those of their wild counterparts in two geographically distant rivers. We found a highly significant proportion of epigenetic variation explained by the rearing environment that was as high as the one explained by the river of origin. The differentially methylated regions show enrichment for biological functions that may affect the capacity of hatchery-born smolts to migrate successfully in the ocean. Shared epigenetic variation between hatchery-reared salmon provides evidence for parallel epigenetic modifications induced by hatchery rearing in the absence of genetic differentiation between hatchery and natural-origin fish for each river. This study highlights epigenetic modifications induced by captive rearing as a potential explanatory mechanism for reduced fitness in hatchery-reared salmon.

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Goodman, Daniel. "Selection equilibrium for hatchery and wild spawning fitness in integrated breeding programs." Canadian Journal of Fisheries and Aquatic Sciences 62, no. 2 (February 1, 2005): 374–89. http://dx.doi.org/10.1139/f04-187.

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Some salmon hatchery programs intentionally integrate the wild and hatchery population by taking naturally spawned fish as some fraction of the broodstock and allowing hatchery progeny to constitute some fraction of the adults spawning in the wild. This circumvents some ecological concerns about the effects of hatchery fish on the "wild" population while still reaping some of the benefits of increased potential for harvest, but it increases some genetic concerns. Here, we model phenotypic evolution in the integrated population to investigate the effects on natural spawning fitness at the joint selection and demographic equilibrium. We find a potential, but not a certainty, depending on quantitative aspects of the management interacting with biological characteristics of the stock, for substantial erosion of natural spawning fitness, compared with the original wild population, including the possibility of runaway selection driving natural spawning fitness effectively to zero. The vulnerability to such evolutionary deterioration increases with the magnitude of the contribution of hatchery breeding to the total production and increases with harvest. The response of the selection equilibrium to increasing contribution of hatchery progeny to the broodstock can exhibit a catastrophic discontinuity.

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Morita, Kentaro, Toshihiko Saito, Yasuyuki Miyakoshi, Masa-aki Fukuwaka, Toru Nagasawa, and Masahide Kaeriyama. "A review of Pacific salmon hatchery programmes on Hokkaido Island, Japan." ICES Journal of Marine Science 63, no. 7 (January 1, 2006): 1353–63. http://dx.doi.org/10.1016/j.icesjms.2006.03.024.

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Abstract Hatchery programmes involving the mass release of cultured fish have been implemented worldwide to supplement wild populations and to increase harvests. Hokkaido Island is one of the most active regions for Pacific salmon hatchery programmes, with ca. 1.2 billion (109) juveniles released annually along a coastline of ca. 3000 km. During the last quarter of the 20th century, coastal catches of chum and pink salmon increased dramatically, whereas those of masu salmon did not. In addition to the development of hatchery technologies, several possible hypotheses may explain these catch trends, including climate change, closing of high-seas fisheries, rehabilitation of water quality, habitat loss caused by damming and channelling, and increased pressure from recreational fisheries. Even when these other factors have been accounted for, it is difficult to evaluate whether all hatchery programmes have actually increased net populations. To use these programmes more effectively, it is necessary to evaluate both their river- and species-specific benefits and compare hatchery programmes with other management tools, such as fishery controls and habitat rehabilitation. Future hatchery programmes should incorporate active, adaptive learning approaches to minimize the risks associated with artificial propagation and to promote sustainable salmon stocks.

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Calcagnotto, Daniela, and Silvio de Almeida Toledo-Filho. "Loss of genetic variability at the transferrin locus in five hatchery stocks of tambaqui (Colossoma macropomum)." Genetics and Molecular Biology 23, no. 1 (March 2000): 127–30. http://dx.doi.org/10.1590/s1415-47572000000100023.

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Knowledge and conservation of the genetic variability in stocks maintained as live gene banks have become a high priority task for Brazilian fish culture. The aim of the present survey was to assess the transferrin allelic diversity of five hatchery stocks of tambaqui (Colossoma macropomum). The tambaqui stock from Pentecoste, the oldest maintained in Brazilian hatchery stations, retained three of the six alleles detected in wild populations of tambaqui from the Amazon River. Other hatchery stocks, directly or indirectly derived from the Pentecoste stock, did not show transferrin allelic variability. Insufficient number of founders and genetic drift due to sampling errors seem to be the main causes leading to loss of genetic diversity in tambaqui hatchery stocks. Appropriate management strategies are required in order to improve the genetic potential of tambaqui stocks in Brazil.

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Pollock, Amanda M. M., Maryam Kamran, Andrew H. Dittman, Marc A. Johnson, and David L. G. Noakes. "Within-river straying: sex and size influence recovery location of hatchery Chinook salmon (Oncorhynchus tshawytscha)." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 2 (February 2020): 226–35. http://dx.doi.org/10.1139/cjfas-2018-0384.

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Salmon straying is often defined as the failure of adults to return to their natal river system. However, straying within a river basin can be problematic if hatchery salmon do not return to their hatchery of origin and subsequently spawn in the wild with natural-origin salmon. We examined within-river straying patterns from 34 years of coded-wire tag data, representing 29 941 hatchery fall Chinook salmon (Oncorhynchus tshawytscha) in the Elk River, Oregon, USA. Using classification tree analysis, we found that females and larger salmon were more likely to be recovered on the spawning grounds than males and smaller fish. Females larger than 980 mm had a 51.6% likelihood of recovery on the spawning grounds rather than at the Elk River Hatchery. Our findings raise questions about the behavior of straying adults and implications for management of these stocks, with a focus on methods to reduce within-river straying. We recommend further studies to determine whether carcass recoveries are fully representative of hatchery salmon that stray within the Elk River basin.

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Tri Cahyono, Riyadi, Any Suryantini, and Jangkung Handoyo Mulyo. "BUSINESS FEASIBILITY AND STRATEGY OF BUSINESS DEVELOPMENT OF CATFISH HATCHERY IN MINAPOLITAN AREA OF MAGELANG DISTRICT." Jurnal Teknosains 8, no. 2 (January 31, 2019): 122. http://dx.doi.org/10.22146/teknosains.38737.

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This study aims to (1) identify the feasibility of catfish hatchery business and (2) to know the alternative and strategic priorities that can be applied in the development of catfish hatchery business in the Minapolitan Area of Magelang District. Research location in sub-District of Muntilan, Mungkid, and Sawangan, was chosen by purposive sampling. Respondents were chosen by snowball 42 as samples from farmers and stakeholders related to catfish hatchery business. Data analysis used on the business feasibility is BEP and R/C ratio criteria. The analysis of business development strategy uses SWOT analysis. The business feasibility analysis tool used is cost analysis, revenue, and nett revenue. Feasibility analysis result obtained BEP revenue of Rp53.587.484,00, BEP production of 255.087,71 unit fish, BEP price of Rp 56.00 per unit fish, and R/C ratio of 1,67. The development of strategy of catfish hatchery business are (1) maintaining good relationship with stakeholders and maximizing natural resources management for business development due to low interest of community on catfish hatchery business, and (2) utilizing expert resources (practitioners and academics) in the field of hatchery by government assistance to improve the quality of seed products and for expanding market size to meet the increased demand.

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Ferguson, Moira M., Peter E. Ihssen, and Julian D. Hynes. "Are Cultured Stocks of Brown Trout (Salmo trutta) and Rainbow Trout (Oncorhynchus mykiss) Genetically Similar to Their Source Populations?" Canadian Journal of Fisheries and Aquatic Sciences 48, S1 (December 19, 1991): 118–23. http://dx.doi.org/10.1139/f91-310.

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The Ontario Ministry of Natural Resources (OMNR) implemented a controlled breeding program in the early 1980's with the objective of culturing fish that are genetically representative of the source populations. We describe the OMNR brookstock management plan for brown trout (Salmo trutta) and rainbow trout (Oncorhynchus mykiss) and test its effectiveness by comparing the allozyme variation of the source fish collected from the Ganaraska River, Ontario to several descendant hatchery lines. Ancestral and descendant rainbow trout do not show significantly different allele frequencies. However, significant differences were detected in brown trout. The absence of several rare alleles in hatchery fish can be explained by sampling error rather than inappropriate propagation methods. Hatchery stocks of either species do not show reduced enzyme heterozygosity compared to wild fish suggesting that the OMNR hatchery system has been successful in retaining allelic variation during broodstock founding and propagation.

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Oosterhout, Gretchen R., Charles W. Huntington, Thomas E. Nickelson, and Peter W. Lawson. "Potential benefits of a conservation hatchery program for supplementing Oregon coast coho salmon (Oncorhynchus kisutch) populations: a stochastic model investigation." Canadian Journal of Fisheries and Aquatic Sciences 62, no. 8 (August 1, 2005): 1920–35. http://dx.doi.org/10.1139/f05-080.

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This study developed a stochastic life cycle model to simulate idealized supplementation strategies to investigate the following question: under what circumstances could hatchery fish stocking contribute to the recovery of Oregon coast coho salmon (Oncorhynchus kisutch)? Simulations were used to find a solution space, defined by the attributes of wild and hatchery-bred salmon, their offspring, and their environments, where hatchery fish could supplement natural production without further depressing it until natural or human factors restricting production were relieved. These simulations suggest that short-duration, tightly controlled, low-intensity conservation hatchery programs designed to minimize genetic and ecological risks may yield minor short-term increases in adult coho salmon abundance while posing significant ecological and genetic risks. No solution space was found that indicated clear long-term benefits from such a supplementation program. Of all the management actions modeled, habitat restoration offered by far the largest and only permanent gains in coho salmon abundance while posing no genetic or ecological risk to the fish. The modeled benefits of habitat restoration were significant regardless of assumptions made about the fitness of hatchery fish and their offspring.

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Abdul Manan, Prayogo, Boedi Setya Rahardja,. "Eksplorasi Bakteri Indigen Pada Pembenihan Ikan Lele Dumbo (Clarias sp.) Sistem Resirkulasi Tertutup [Exploration Of Indigen Bacteria From Catfish (Clarias sp.) Breeding On Closed Resirculation System ]." Jurnal Ilmiah Perikanan dan Kelautan 4, no. 2 (January 23, 2019): 193. http://dx.doi.org/10.20473/jipk.v4i2.11571.

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Abstract The efforts of the catfish hatchery fish are generally confined to the central areas of hatchery that has abundant water resources. Solving the problem of limited water, appears a catfish hatchery system with a closed recirculation system. In such systems the process of biological filtration is the most important thing. It shows the handling of organic materials by utilizing the degrading bacteria is the key to successful management of the system. Thus necessary to be studied the role of bacteria degrading organic matter indigen (local bacteria) in the closed hatchery recirculation system of catfish. This study aimed to obtain bacterial strains degrading bacteria indigen as organic materials are very useful in improving water quality in the closed hatchery recirculation system of catfish and knowing the methods to the use of bacteria indigen as degrading organic matter. The method used in this study was designed based on the stages of research carried out in accordance with the objectives to be achieved. The results of the isolation and identification to the species level showed Pseudomonas stutzeri and Pseudomonas pseudomallei obtain the greatest value for hydrolysis index representing each trait protease, lipase and amylase. Bioremediation effectiveness test in vitro showed effective results in the treatment using consortia of bacteria inoculant. Consortia of bacteria inoculant effective in improving the growth rate and survival rate (SR) in the closed hatchery recirculation system of catfish.

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Slaney, P. A., L. Berg, and A. F. Tautz. "Returns of Hatchery Steelhead Relative to Site of Release below an Upper-River Hatchery." North American Journal of Fisheries Management 13, no. 3 (August 1993): 558–66. http://dx.doi.org/10.1577/1548-8675(1993)013<0558:rohsrt>2.3.co;2.

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Islam, Md Samadul, Abdulla Al Asif, Baadruzzoha Sarker, Abdus Satter, Meraz Ahmed, Mizanur Rahman, Md Abu Zafar, and SM Rahmatullah. "Fry production and its marketing system of North-West fisheries extension project at Parbatipur, Dinajpur, Bangladesh." Asian Journal of Medical and Biological Research 3, no. 3 (November 28, 2017): 368–78. http://dx.doi.org/10.3329/ajmbr.v3i3.34527.

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In order to understand the present status of hatcheries, questionnaire interview and participatory rural appraisal tools were used in North-west Fisheries Extension Project (NFEP), Parbatipur during the period from July to December 2015. There are two hatcheries in NFEP, Parbatipur- a carp hatchery and a prawn hatchery. The production of spawn was around 611 kg in the year 2015. According to the target hatchery manager collected brood fish from rivers and other sources which he maintained in their brood stock ponds with proper management. The hatchery manager maintained proper age and weight of broods for spawning and followed the guideline of hatchery operation so that the quality of spawn and fry were good. It was found that the hatcheries produced fish seed of a variety of species such as Indian major carps, carpio, sarpunti, silver carp, grass carp, magur, shing as well as freshwater prawn. The hatchery production activities took place starting from February and continued up to September. The quantity of fish seed produce varied from 25 to 75 kg per hatching cycle depending on size and facilities of hatcheries. The price of fry in NFEP was being fixed by the hatchery manager. However, the price variation was seen due to seasonal variation, species and demand. The average price of fish seed was highest in monsoon and lowest in winter. A number of middlemen were involved in the fry marketing channel of NFEP at Parbatipur. They were responsible for increasing the price of fry at each stage of marketing channel.Asian J. Med. Biol. Res. September 2017, 3(3): 368-378

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Waples, Robin S. "Genetic interactions Between Hatchery and Wild Salmonids: Lessons from the Pacific Northwest." Canadian Journal of Fisheries and Aquatic Sciences 48, S1 (December 19, 1991): 124–33. http://dx.doi.org/10.1139/f91-311.

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The potential for genetic interactions between hatchery and wild populations of salmonids in northwestern North America has increased considerably in recent decades. Efforts to mitigate severe losses to many wild stocks caused by overfishing, destruction of habitat, and blockage of migratory routes have focussed on boosting artificial production in public hatcheries. Opportunities for genetic interactions between hatchery and wild fish will increase if efforts to supplement wild production with hatchery-reared fish continue. Concerns center on three issues: (1) direct genetic effects (caused by hybridization and introgression); (2) indirect genetic effects (principally due to altered selection regimes or reductions in population size caused by competition, predation, disease, or other factors); and (3) genetic changes to hatchery stocks (through selection, drift, or stock transfers), which magnify the consequences of hybridization with wild fish. Strategies for minimizing these genetic risks and monitoring the consequences of various management options are discussed, and some important areas for future research are identified.

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Walters, Carl J., Jeremy S. Collie, and Timothy Webb. "Experimental Designs for Estimating Transient Responses to Management Disturbances." Canadian Journal of Fisheries and Aquatic Sciences 45, no. 3 (March 1, 1988): 530–38. http://dx.doi.org/10.1139/f88-062.

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Simple experimental designs invoking treated and control areas, with all treatments initiated at the same time, should not be used to assess transient responses to management actions or environmental disturbances. Such designs will not properly control for "time–treatment" interactions, involving differential responses of treated areas to nonrandom trends in the experimental environment. For example, survival trends for hatchery salmon stocks cannot be simply compared with survival trends in wild stocks, since the hatchery stocks may be more susceptible to changes in environmental factors such as ocean temperature. To control for such time–treatment interactions, it is suggested to use a "staircase" experimental design in which treatment is initiated at different times on the treated areas. Computation of the average transient and interaction response parameters for such designs, while correcting for temporal trends and inherent differences among areas, can be done using general linear models. The optimum design configuration (number of treated versus control areas, number of pretreatment control times, etc.) involves spreading the treatment starts widely over time and using relatively few control areas.

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Geiger, James G., and Nick C. Parker. "Survey of Striped Bass Hatchery Management in the Southeastern United States." Progressive Fish-Culturist 47, no. 1 (January 1985): 1–13. http://dx.doi.org/10.1577/1548-8640(1985)47<1:sosbhm>2.0.co;2.

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Schulstad, Geir. "Design of a computerized decision support system for hatchery production management." Aquacultural Engineering 16, no. 1-2 (March 1997): 7–25. http://dx.doi.org/10.1016/s0144-8609(96)01016-3.

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van de Merwe, J. P., K. Ibrahim, and J. M. Whittier. "Post-emergence handling of green turtle hatchlings: improving hatchery management worldwide." Animal Conservation 16, no. 3 (December 13, 2012): 316–23. http://dx.doi.org/10.1111/j.1469-1795.2012.00603.x.

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Sullivan, Joseph R. "Book review: Gary Wedemeyer (ed.), Fish Hatchery Management, Second Edition. 2001." Reviews in Fish Biology and Fisheries 14, no. 2 (June 2004): 297–300. http://dx.doi.org/10.1007/s11160-004-6925-2.

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Evenson, M. D., and R. D. Ewing. "Migration Characteristics and Hatchery Returns of Winter Steelhead Volitionally Released from Cole Rivers Hatchery, Oregon." North American Journal of Fisheries Management 12, no. 4 (November 1992): 736–43. http://dx.doi.org/10.1577/1548-8675(1992)012<0736:mcahro>2.3.co;2.

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Williamson, Kevin S., Andrew R. Murdoch, Todd N. Pearsons, Eric J. Ward, and Michael J. Ford. "Factors influencing the relative fitness of hatchery and wild spring Chinook salmon (Oncorhynchus tshawytscha) in the Wenatchee River, Washington, USA." Canadian Journal of Fisheries and Aquatic Sciences 67, no. 11 (November 2010): 1840–51. http://dx.doi.org/10.1139/f10-099.

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Understanding the relative fitness of naturally spawning hatchery fish compared with wild fish has become an important issue in the management and conservation of salmonids. We used a DNA-based parentage analysis to measure the relative reproductive success of hatchery- and natural-origin spring Chinook salmon ( Oncorhynchus tshawytscha ) in the natural environment. Size and age had a large influence on male fitness, with larger and older males producing more offspring than smaller or younger individuals. Size had a significant effect on female fitness, but the effect was smaller than on male fitness. For both sexes, run time had a smaller but still significant effect on fitness, with earlier returning fish favored. Spawning location within the river had a significant effect on fitness for both sexes. Hatchery-origin fish produced about half the juvenile progeny per parent when spawning naturally than did natural-origin fish. Hatchery fish tended to be younger and return to lower areas of the watershed than wild fish, which explained some of their lower fitness.

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Alioravainen, Nico, Pekka Hyvärinen, and Anssi Vainikka. "Behavioural effects in juvenile brown trout in response to parental angling selection." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 2 (February 2020): 365–74. http://dx.doi.org/10.1139/cjfas-2018-0424.

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Fishing that selectively captures and removes fish based on their behavioural decisions is predicted to induce evolution towards timid fish stocks. Thus, offspring behaviour should associate with parental vulnerability to angling. We examined phenotypic behavioural variation in juvenile brown trout (Salmo trutta) whose parents, representing a hatchery and a wild stock, were experimentally grouped based on their relative vulnerability to angling. The F1 offspring from highly vulnerable (HV) and low vulnerable (LV) parents were reared in common garden conditions together with a crossbred wild × hatchery reference group and tested for boldness during their first summer. Wild LV juveniles were the shyest of all fish, but not distinctly shyer than wild HV juveniles. Contradictorily, hatchery LV juveniles expressed bolder behaviour than hatchery HV juveniles. We show that angling selection may have transgenerational behavioural effects independently of size variation, but changes in behaviour can manifest differently in fish from different backgrounds. Our results partly support the earlier findings of increased angling-induced timidity in wild populations and thus call for management focus on behavioural effects of fishing.

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Sekino, Masashi, Kenji Saitoh, Tetsuo Yamada, Atsushi Kumagai, Motoyuki Hara, and Yoh Yamashita. "Microsatellite-based pedigree tracing in a Japanese flounder Paralichthys olivaceus hatchery strain: implications for hatchery management related to stock enhancement program." Aquaculture 221, no. 1-4 (May 2003): 255–63. http://dx.doi.org/10.1016/s0044-8486(02)00667-1.

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Aji, Ludi Parwadani. "A REVIEW OF PEARL OYSTER (Pinctada maxima) CULTUREIN GENERAL." Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology 6, no. 2 (February 22, 2012): 85–91. http://dx.doi.org/10.14710/ijfst.6.2.85-91.

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ABSTRACT Pearl oyster culture is unique because the product is gem not flesh and one of the species that produce pearl is Pinctada maxima (Silver or Gold lip pearl oyster). Stock for pearl oyster production can be collected from the wild or hatchery. However, hatchery production is a better solution to supply P.maxima for pearl production rather than just depend on wild stocks. Spat from the wild or hatchery will be grown-out for pearl production by longline or raft culture system method in ocean. Raft culture provide a work platform to repair, clean and store culture tools, while, longline culture has better design to deal with wave or wind exposure. There are identified different culture systems according different species (for example between P.maxima and P.fucata) and locations. Several constraints on P. maxima culture also identify such as biofouling organisms, predations and diseases that can reduce productivity and pearl quality. For example, mass mortalities of P.maxima occurred in Western Australia due to viral infection and it disrupted the pearl oyster industry. Therefore, several strategies are needed to mitigate those problems to achieve maximal productivity by using good management culture practice. Key word: pearl oyster, P. maxima, management, culture

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Arnason, A. N., and D. H. Scuse. "Design and Implementation of a Computerized Decision Support System for Hatchery Management." IFAC Proceedings Volumes 20, no. 7 (August 1987): 231–41. http://dx.doi.org/10.1016/s1474-6670(17)59185-5.

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Hemal, Shahrear, Md Shahab Uddin, Md Saif Uddin, Bhaskar Chandra Majumdar, Md Golam Rasul, and Md Tariqul Alam. "Present status and problems of fish seed marketing in Sylhet district, Bangladesh." Research in Agriculture Livestock and Fisheries 4, no. 1 (April 30, 2017): 45–54. http://dx.doi.org/10.3329/ralf.v4i1.32405.

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Correction: On 3rd May 2017, the PDF was replaced with a correction on page 51. In the figure at the top of page 51, Channel 6 was added.This study was conducted to explore the present status and problems of fish seed marketing system in Sylhet district, Bangladesh. Data were collected through questionnaire interview from the selected areas during April to September 2016. Brood fishes were collected from wild sources as well as hatchery produced brood fishes also used for seed production. Good length, weight and age of brood fishes were selected for spawning and induced breeding. In nursery, hatchlings were reared for 30-40 days and 37.7% nursery owner practiced single cycle production/year where the average stocking density of seed was found 24.65±3.94 g/decimal (mean±SD). Six different fish seed marketing channels were identified where hatchery owners, nursery owners, forias (retailer) and fish farmers were main stakeholders. The highest (6520 Tk/day) and lowest (355 Tk/day) average income were found in hatchery owner and fish farmer, respectively. Oxygenated bag, big aluminum bowl/container and plastic barrels with continuously agitate the water were used for seed transportation. Maximum 17.67% seed mortality was noticed in hatchery owner and minimum 5.67% in fish farmers. Late breeding season, lack of capital, lack of technical knowledge on hatchery operation and management, poor transport facilities, high transportation cost, high labor cost, lack of training and high price of spawn are identified as some major problems.Res. Agric., Livest. Fish.4(1): 45-54, April 2017

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Lorenzen, Kai. "Population dynamics and potential of fisheries stock enhancement: practical theory for assessment and policy analysis." Philosophical Transactions of the Royal Society B: Biological Sciences 360, no. 1453 (January 28, 2005): 171–89. http://dx.doi.org/10.1098/rstb.2004.1570.

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The population dynamics of fisheries stock enhancement, and its potential for generating benefits over and above those obtainable from optimal exploitation of wild stocks alone are poorly understood and highly controversial. I review pertinent knowledge of fish population biology, and extend the dynamic pool theory of fishing to stock enhancement by unpacking recruitment, incorporating regulation in the recruited stock, and accounting for biological differences between wild and hatchery fish. I then analyse the dynamics of stock enhancement and its potential role in fisheries management, using the candidate stock of North Sea sole as an example and considering economic as well as biological criteria. Enhancement through release of recruits or advanced juveniles is predicted to increase total yield and stock abundance, but reduce abundance of the naturally recruited stock component through compensatory responses or overfishing. Economic feasibility of enhancement is subject to strong constraints, including trade–offs between the costs of fishing and hatchery releases. Costs of hatchery fish strongly influence optimal policy, which may range from no enhancement at high cost to high levels of stocking and fishing effort at low cost. Release of genetically maladapted fish reduces the effectiveness of enhancement, and is most detrimental overall if fitness of hatchery fish is only moderately compromised. As a temporary measure for the rebuilding of depleted stocks, enhancement cannot substitute for effort limitation, and is advantageous as an auxiliary measure only if the population has been reduced to a very low proportion of its unexploited biomass. Quantitative analysis of population dynamics is central to the responsible use of stock enhancement in fisheries management, and the necessary tools are available.

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Baracho, Marta dos S., Irenilza de A. Nääs, Diego P. Neves, Juliano de A. Cassiano, Fabiana G. Lima, Daniella J. de Moura, and Rodrigo G. Garcia. "Estimating the most important criteria for hatching eggs as function of broiler breeders age." Engenharia Agrícola 33, no. 3 (June 2013): 445–52. http://dx.doi.org/10.1590/s0100-69162013000300002.

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This research aimed to compare two female broiler breeder ages during the incubation period regarding management using the Analytic Hierarchy Process method (AHP). This method is characterized by the possibility of analyzing a multicriteria problem and assists a decision making. This study was carried out on a commercial hatchery located in São Paulo, Brazil. Two ages of broiler breeder (42 and 56 weeks) were compared relative to production rate. Production index data were the same in both ages and were submitted to multicriteria decision analysis using the AHP method. The results indicate that broiler breeders of 42 weeks presented better performance than those of 56 week-old. The setter phase (incubation) is more critical than the hatcher. The AHP method was efficient for this analysis and can serve as a methodological basis for future studies to improve the hatchability of broilers eggs.

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van de Merwe, Jason, Kamarruddin Ibrahim, and Joan Whittier. "Effects of hatchery shading and nest depth on the development and quality of Chelonia mydas hatchlings: implications for hatchery management in Peninsular, Malaysia." Australian Journal of Zoology 53, no. 3 (2005): 205. http://dx.doi.org/10.1071/zo03052.

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One of the decisions made by hatchery managers around the world is what degree of shading and nest depth are required to maximise the production of high-quality hatchlings at optimal sex ratios. The primary objectives of this study were to determine the effects of (1) hatchery shading and nest depth on nest temperatures and emergence lag, and (2) nest temperatures and nest depth on hatchling sex ratio and quality. In 2001, 26 Chelonia mydas clutches from Ma’Daerah beach, Terengganu, Malaysia, were relocated alternatively at depths of 50 cm and 75 cm into a 70%-shaded and a 100%-shaded hatchery. Data loggers were placed into the centre of each relocated clutch to record the temperature every hour over the course of incubation. When the hatchlings emerged, a sample of the clutch was run, measured and weighed and a separate sample was examined histologically for sex characteristics. Nest temperatures ranged between 28°C and 30°C and generally showed increases over the second half of incubation due to metabolic heating of the clutch. There was no significant correlation found between nest temperature and any of the hatchling parameters measured. Hatchlings from 75-cm-deep nests had a longer emergence lag (46.4 (±10.2) h) than hatchlings from 50-cm-deep nests. Hatch and emergence success were similar to those of natural populations and hatchling sex ratios were male dominant, with an average of 72% males. There was a poor correlation between mean middle-third incubation temperatures and sex ratio. Hatchlings from 75-cm-deep nests had similar running speeds but lower condition index than their conspecifics from 50-cm-deep nests.

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Pitman, Veronica M., and Steve Gutreuter. "Initial Poststocking Survival of Hatchery-Reared Fishes." North American Journal of Fisheries Management 13, no. 1 (February 1993): 151–59. http://dx.doi.org/10.1577/1548-8675(1993)013<0151:ipsohr>2.3.co;2.

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Hsu, Te-Hua, Chang-Wen Huang, Hung-Tai Lee, Yi-Hsuan Kuo, Kwang-Ming Liu, Cheng-Hui Lin, and Hong-Yi Gong. "Population Genetic Analysis for Stock Enhancement of Silver Sea Bream (Rhabdosargus sarba) in Taiwan." Fishes 5, no. 2 (June 16, 2020): 19. http://dx.doi.org/10.3390/fishes5020019.

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Stock enhancement is a method for replenishing depleted wild finfish populations by supplementing them with hatchery-raised fish. In Taiwan, silver sea bream (Rhabdosargus sarba) is a predominant commercial species involved in stock enhancement projects. Although management agencies conduct stock enhancement projects, there are a lot of private releases without records. Stock enhancement is performed by the private aquaculture sector without accurate genetic records, potentially leading to unintended consequences for wild populations. We analyzed the genetics of 459 wild and 701 hatchery-reared specimens from nine batches produced by various hatcheries. Wild and hatchery-reared samples could be considered two separate clades by using a set of stable and informative microsatellite markers including type I (from gene introns and 3′UTR) and type II markers (randomly picked up from genome). Type I microsatellite markers could more sensitively reflect the loss of genetic diversity more than type II markers in the domestication process. All specimens were considered native by using mtDNA COI and microsatellites. The genetic composition of the wild population is relatively simple, and the estimated low contribution rate of the hatchery stock (1.3–10.9%; 6–50/459) indicated a weak but significant genetic effect of stock enhancement. Therefore, establishing standards for the stock enhancement of silver sea bream for more effective supplementation of wild populations is imperative.

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Evans, Heather K., Kara B. Carlson, Russ Wisser, Morgan E. Raley, Katy M. Potoka, and Kevin J. Dockendorf. "Genetics and Hatchery Management: A Parentage-based Tagging Approach to Blueback Herring Conservation." Journal of Fish and Wildlife Management 9, no. 1 (October 10, 2017): 4–13. http://dx.doi.org/10.3996/022017-jfwm-011.

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Abstract Blueback Herring Alosa aestivalis populations throughout the East Coast have declined precipitously since the late 1980s and were listed as a Species of Concern in 2006 by the National Oceanic and Atmospheric Administration. Natural resource agencies are attempting to restore this species to viable and sustainable levels with fry stockings cultured in hatcheries. To evaluate the long-term contribution of stockings to populations, agencies need an accurate method to track these stocking efforts. Genetic parentage-based tagging is recognized as a feasible means of assessing hatchery contribution of stocked fish to rivers of interest. However, Blueback Herring lack a reliable set of genetic markers to conduct parentage-based tagging. To this end, we analyzed previously described microsatellites as well as new microsatellite markers identified through NextGeneration sequencing to create a suite of 14 Blueback Herring markers useful for parentage-based tagging. The markers were successful in parentage analysis for Blueback Herring collected from the Chowan River, North Carolina. An additional challenge in the management of Blueback Herring is the ability to phenotypically distinguish Blueback Herring from the closely related Alewife Alosa pseudoharengus. Furthermore, recent studies provide evidence that these two species, collectively referred to as river herring, may be hybridizing with one another in some systems. Microsatellite marker AsaC334 can be utilized to discriminate between the two species, as well as to identify their F1 hybrids, thereby providing another genetic tool for hatchery management.

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Sohn, Saebom, Kathryn Markey Lundgren, Karin Tammi, Murni Karim, Roxanna Smolowitz, David R. Nelson, David C. Rowley, and Marta Gómez-Chiarri. "Probiotic Strains for Disease Management in Hatchery Larviculture of the Eastern OysterCrassostrea virginica." Journal of Shellfish Research 35, no. 2 (August 2016): 307–17. http://dx.doi.org/10.2983/035.035.0205.

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Belmudes, Dalton, Fernanda S. David, Fernando H. Gonçalves, and Wagner C. Valenti. "Sustainability Analysis of the Production of Early Stages of the Atlantic Forest Lambari (Deuterodon iguape) in a Public Hatchery at a Rainforest Conservation Area." Sustainability 13, no. 11 (May 25, 2021): 5934. http://dx.doi.org/10.3390/su13115934.

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Protected areas have been used worldwide to conserve natural resources. Nevertheless, economic activities to provide income for communities living within and surrounded by conservation areas remain an issue. This study aimed to assess the sustainability of a Deuterodon iguape hatchery, situated within an Atlantic Rainforest Park, to leverage grow-out farming of this small native fish, affording income and food security for local families. We have used a set of indicators of economic, social, and environmental sustainability. The initial investment is about US$ 40,000, which should see a return in ~2 years. The internal rate of return is close to 50%, including the externality costs, which is attractive for both public and private investors. The hatchery generated few direct jobs, but the workforce can be recruited from the community, and the hatchery can enable the establishment of several small grow-out farms, leveraging the development of indirect jobs and self-employment. The system had a low environmental impact, showing a minor release of pollutants, a low risk for biodiversity, and absorption of 18 g of CO2 equivalent per thousand post-larvae produced, contributing to the struggle against climate change. Therefore, the D. iguape hatchery demonstrates the potential of combining biodiversity conservation and income generation, meeting the Sustainable Development Goals of Agenda 2030.

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Powell, Madison S., Ronald W. Hardy, Alison M. Hutson, Louie A. Toya, and Douglas Tave. "Comparison of Body Composition and Fatty Acid Profiles between Wild and Cultured Rio Grande Silvery Minnows." Journal of Fish and Wildlife Management 8, no. 2 (August 1, 2017): 487–96. http://dx.doi.org/10.3996/072016-jfwm-055.

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Abstract Federally endangered Rio Grande Silvery Minnows (RGSM; Hybognathus amarus) were raised in one of three culture regimes: intensively, with only a hatchery diet; semi-intensively with access to natural food and hatchery diet supplementation; and with only natural food available at the Los Lunas Silvery Minnow Refugium (Los Lunas, New Mexico), a naturalized conservation refugium designed to mimic the natural environment of the RGSM in the Rio Grande. The project compared each culture regime and assessed differences and similarities in lipid and fatty acid content between feeding an artificial diet and consumption of natural food items in this species. After 117 d, whole-body lipid levels and fatty acid profiles were measured in each group and compared with values for wild RGSM. Fish fed the hatchery diet exclusively or as supplementary feed had significantly higher percent lipid (15.5% ± 0.5% and 10.6% ± 0.1%, respectively) than fish raised without access to the diet. Both groups had significantly higher percent lipid than fish raised in the refugium or wild fish (8.3% ± 0.1% and 7.8% ± 0.2%, respectively). Condition factor differed among groups and was highest in fish fed the hatchery diet (1.00) followed by fish supplemented with the hatchery diet (0.93), refugium fish (0.91), and wild fish (0.90). In this respect, refugium fish appeared more similar to wild fish than fish fed the hatchery diet or offered the diet as a supplement. Comparison of fatty acid profiles among groups showed marked differences among wild fish, refugium fish, and those fed the hatchery diet, either exclusively or as supplementary feed. Total omega-3 fatty acids, expressed as percentage of total fatty acids, were highest in wild fish but similar among other groups. Total omega-6 fatty acids showed an opposite trend, with five to nine times higher percentages of linoleic acid observed among fish from the three culture regimes compared with wild fish. Significant differences in lipid content and fatty acid composition between wild RGSM and cultured silvery minnows reflected their respective diets and culture regimes. Given similarities in fat content and condition factor with wild RGSM, we conclude that fish in the refugium do not require supplemental feeding with an artificial diet for this type of naturalized conservation management. Results from this study show that RGSM readily forage on natural food items present and also artificial feed when available, indicating dietary plasticity, which is advantageous for fish culture and future recovery.

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PERSOONS, D., F. HAESEBROUCK, A. SMET, L. HERMAN, M. HEYNDRICKX, A. MARTEL, B. CATRY, A. C. BERGE, P. BUTAYE, and J. DEWULF. "Risk factors for ceftiofur resistance inEscherichia colifrom Belgian broilers." Epidemiology and Infection 139, no. 5 (June 29, 2010): 765–71. http://dx.doi.org/10.1017/s0950268810001524.

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SUMMARYA cross-sectional study on 32 different Belgian broiler farms was performed in 2007 and 2008 to identify risk factors for ceftiofur resistance inEscherichia coli. On each farm, oneE. colicolony was isolated from 30 random birds. Following susceptibility testing of 14 antimicrobials, an on-farm questionnaire was used to obtain information on risk factors. Using a multilevel logistic regression model two factors were identified at the animal level: resistance to amoxicillin and to trimethoprim–sulfonamide. On the farm level, besides antimicrobial use, seven management factors were found to be associated with the occurrence of ceftiofur resistance inE. colifrom broilers: poor hygienic condition of the medicinal treatment reservoir, no acidification of drinking water, more than three feed changes during the production cycle, hatchery of origin, breed, litter material used, and treatment with amoxicillin. This study confirms that not only on-farm antimicrobial therapy, but also management- and hatchery-related factors influence the occurrence of antimicrobial resistance.

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Glatz, P. C., and Z. H. Miao. "Husbandry of ratites and potential welfare issues: a review." Australian Journal of Experimental Agriculture 48, no. 10 (2008): 1257. http://dx.doi.org/10.1071/ea08136.

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Since the mid-1980s, there has been worldwide farming of ratites, particularly with ostriches, emus and rheas for feathers, meat, skin and oil. Most of these ratites are produced commercially outside their native habitat. This has raised concerns about welfare, particularly whether birds are provided the five freedoms: food and water; shelter; health care; alleviation of pain and suffering; and the freedom of movement. This paper reviews the factors that influence bird welfare before hatch with breeder, egg and hatchery management and after hatch with brooding and rearing systems, stocking density, handling, transport, disease and slaughter. Assessment of bird welfare in each of the production sectors in the industry is based on how well the five freedoms are being met. The review identifies egg handling practices and hatchery hygiene that can have a major impact on the subsequent health of hatched chicks. In addition, feeding of appropriate diets, reducing stocking density and improving housing can improve bird health and freedom of movement. When the husbandry practice of toe trimming is not practiced according to the best practice method, chronic pain may result and impair walking ability of birds. Stress and injuries to birds can be reduced when birds are handled correctly on farm and in the lairage and are transported using appropriate vehicles. Farmers, transporters and abattoir staff can have a major impact on maintaining bird welfare if best practice farming systems and husbandry practices are implemented.

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Nascimento‐Schulze, Jennifer C., Tim P. Bean, Ross D. Houston, Eduarda M. Santos, Matthew B. Sanders, Ceri Lewis, and Robert P. Ellis. "Optimizing hatchery practices for genetic improvement of marine bivalves." Reviews in Aquaculture 13, no. 4 (May 7, 2021): 2289–304. http://dx.doi.org/10.1111/raq.12568.

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Samad, Md Abdus, Md Ridoanul Ahmed, Ripon Kumar Adhikary, Shuvagato Mondal, and Sayed Mohammad Farah. "Status of biosecurity and prevalent parasitic diseases in finfish hatcheries of Jessore, Bangladesh." Journal of Fisheries 2, no. 1 (April 30, 2014): 80. http://dx.doi.org/10.17017/jfish.v2i1.2014.21.

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The present study was conducted to know the status of biosecurity and prevalent parasitic diseases in finfish hatcheries of Jessore district. The peak season of seed production was found April to May. Management of biosecurity has been practiced to prevent disease outbreaks and exert quite satisfactory. It was observed; hatchery owners cleaned their hatchery units regularly and maintained hygiene (76.66%), water quality (56.66%), disinfected equipments (76.00%), stocked disease free broods (76.00%) and quarantine (56.66%). Prevalence of diseases were- lernaeasis (34.10%), argulosis (23.86%), leeches (11.36%), dactylogyrosis (7.95%), gyrodactylosis (10.23%) and others (12.50%) in brood fish and fry. In broods, average prevalence was 16.67% with 9.25% mortality. Besides average prevalence was 10-15% with 10% mortality in fry. The epizootiological pattern showed the highest frequency of parasitic diseases during winter because of loss of appetites. The study demonstrated that sumithion was used by (93.32%), magic (46.33%), depterax (56.67%), lime with KMnO4 (80.00%), lime with salt (66.67%) and lime- salt- KMnO4 (50.00%) by hatchery owners respectively for treatments. Lack of assistance, proper knowledge and suitable therapeutics with its proper use were the major problems in the hatcheries.

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Journal articles on the topic 'Hatchery management'

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