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Journal articles on the topic 'Hatchery-reared fish'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Swain, D. P., B. E. Riddell, and C. B. Murray. "Morphological Differences between Hatchery and Wild Populations of Coho Salmon (Oncorhynchus kisutch): Environmental versus Genetic Origin." Canadian Journal of Fisheries and Aquatic Sciences 48, no. 9 (1991): 1783–91. http://dx.doi.org/10.1139/f91-210.

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Previous studies have demonstrated morphological differences between hatchery-reared coho salmon (Oncorhynchus kisutch) of hatchery origin and wild-reared coho of wild origin. We tested for a genetic component to this divergence by comparing coho from hatchery and wild populations both reared in the same hatchery environment and for an environmental component by comparing hatchery- and wild-reared coho both of wild origin. As in the previous studies, wild-reared fish from wild populations had greater head dimensions, larger median fins, and deeper bodies than did hatchery-reared fish from hatc

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Chen, Huijuan, Dengqiang Wang, Xinbin Duan, Shaoping Liu, Daqing Chen, and Yun Li. "Hatchery-reared enhancement program for silver carp (Hypophthalmichthys molitrix) in the middle Yangtze River: monitoring the effectiveness based on parentage analysis." PeerJ 7 (May 6, 2019): e6836. http://dx.doi.org/10.7717/peerj.6836.

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Introduction A hatchery-reared silver carp (Hypophthalmichthys molitrix) program has been intensively carried out since 2010 to enhance the rapidly declining fisheries production in the middle Yangtze River. However, only a little information regarding the effectiveness of the enhancement program has been reported. In this context, this study investigates on an enhancement program through monitoring the efficacy based on parentage analysis. Methods A total of 1,529 hatchery-reared fish and 869 larvae were sampled from the middle Yangtze River in 2016 and 2017 and were genotyped by thirteen mic

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3

Binder, Thomas R., Stephen C. Riley, Christopher M. Holbrook, et al. "Spawning site fidelity of wild and hatchery lake trout (Salvelinus namaycush) in northern Lake Huron." Canadian Journal of Fisheries and Aquatic Sciences 73, no. 1 (2016): 18–34. http://dx.doi.org/10.1139/cjfas-2015-0175.

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Fidelity to high-quality spawning sites helps ensure that adults repeatedly spawn at sites that maximize reproductive success. Fidelity is also an important behavioural characteristic to consider when hatchery-reared individuals are stocked for species restoration, because artificial rearing environments may interfere with cues that guide appropriate spawning site selection. Acoustic telemetry was used in conjunction with Cormack–Jolly–Seber capture–recapture models to compare degree of spawning site fidelity of wild and hatchery-reared lake trout (Salvelinus namaycush) in northern Lake Huron.

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Brockmark, Sofia, and Jörgen I. Johnsson. "Reduced hatchery rearing density increases social dominance, postrelease growth, and survival in brown trout (Salmo trutta)." Canadian Journal of Fisheries and Aquatic Sciences 67, no. 2 (2010): 288–95. http://dx.doi.org/10.1139/f09-185.

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Hatchery fish reared for conservation or supplementation often have difficulties adapting to natural conditions, resulting in poor performance in the wild. In a standard hatchery, fish are confined at high densities, which creates a social environment different from that experienced after release. Here we investigated how rearing density influences social dominance, postrelease growth, and survival in brown trout ( Salmo trutta ). Fish were reared at three density treatments: conventional hatchery density, half of conventional hatchery density, and natural density. Four months after hatching,

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Regish, Amy M., William R. Ardren, Nicholas R. Staats, et al. "Surface water with more natural temperatures promotes physiological and endocrine changes in landlocked Atlantic salmon smolts." Canadian Journal of Fisheries and Aquatic Sciences 78, no. 6 (2021): 775–86. http://dx.doi.org/10.1139/cjfas-2020-0295.

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Hatchery salmonid smolts are often reared using groundwater with elevated temperatures to maximize growth. Previous work has shown that rearing hatchery smolts in surface water with a more natural thermal regime resulted in increased return rates of adult landlocked Atlantic salmon (Salmo salar). We evaluated whether landlocked Atlantic salmon reared in surface water with a natural temperature regime have altered physiological smolt characteristics compared with fish reared in groundwater with elevated winter temperatures. Hatchery fish were sampled three consecutive years from January to May.

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Qi, Yulu, Chenhui Liu, Guozi Yuan, et al. "Disparities in Body Color Adaptability and Ambient Light Color Preference between Wild and Hatchery-Reared Marbled Rockfish (Sebastiscus marmoratus)." Animals 14, no. 11 (2024): 1701. http://dx.doi.org/10.3390/ani14111701.

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Hatchery rearing significantly influences the phenotypic development of fish, with potential adverse effects for the post-release performance of hatchery-reared individuals in natural environments, especially when targeted for stock enhancement. To assess the suitability of releasing hatchery-reared fish, a comprehensive understanding of the phenotypic effects of captive rearing, through comparisons with their wild conspecifics, is essential. In this study, we investigated the divergence in body coloration between wild and hatchery-reared marbled rockfish Sebastiscus marmoratus. We examined th

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Legault, Michel, and Louis-Marie Lalancette. "Temps d'ajustement de la flottabilité des saumons atlantiques (Salmo salar) d'élevage et flottabilité comparée de saumons atlantiques d'élevage et sauvages." Canadian Journal of Fisheries and Aquatic Sciences 42, no. 3 (1985): 619–23. http://dx.doi.org/10.1139/f85-081.

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We determined the time of adjustment of buoyancy of juvenile hatchery-reared Atlantic salmon (Salmo salar) and investigated whether if their higher position off the substratum, compared with wild fish, might better result from a higher buoyancy. In flowing water, hatchery-reared Atlantic salmon adjust their buoyancy within 24 h. No difference in buoyancy exists between juvenile hatchery-reared and wild Atlantic salmon in still water. However, juvenile hatchery-reared Atlantic salmon are more buoyant in flowing water than wild Atlantic salmon. Even after 3 mo in a stream, the buoyancy of juveni

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8

McDonald, D. G., C. L. Milligan, W. J. McFarlane, et al. "Condition and performance of juvenile Atlantic salmon (Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish." Canadian Journal of Fisheries and Aquatic Sciences 55, no. 5 (1998): 1208–19. http://dx.doi.org/10.1139/f98-003.

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This study examined the effects of various modifications of rearing practices on hatchery-reared Atlantic salmon (Salmo salar) fingerlings and compared condition and performance of hatchery fingerlings (age 0+) and yearlings (age 1+) with those of wild-reared Atlantic salmon. Reduced fish density (and increased ration) in rearing tanks promoted increased growth and condition factor and significant changes in muscle composition, including increased muscle lipid content and glycolytic enzyme activity, specfically phosphofructokinase and lactate dehydrogenase. However, these changes had no effect

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9

Salonius, Kira, and George K. Iwama. "Effects of Early Rearing Environment on Stress Response, Immune Function, and Disease Resistance in Juvenile Coho (Oncorhynchus kisutch) and Chinook Salmon (O.tshawytscha)." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 4 (1993): 759–66. http://dx.doi.org/10.1139/f93-087.

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Coho (Oncorhynchus kisutch) and chinook salmon (0. tshawytscha) from aquaculture and wild environments were subjected to handling (30–60 s of netting and aerial emersion) and disease challenges. Plasma cortisol concentrations ([cortisol]pl) in both coho and chinook salmon from wild environments were significantly elevated 4 h after handling. Colonized coho salmon (hatchery-reared fish, transported into a natural water body as fry) responded in a similar fashion to wild fish, while those reared entirely in the hatchery showed no significant rise in [cortisol]pl. The responses to handling stress

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10

Belk, Mark C., Lisa J. Benson, Josh Rasmussen, and Steven L. Peck. "Hatchery-induced morphological variation in an endangered fish: a challenge for hatchery-based recovery efforts." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 3 (2008): 401–8. http://dx.doi.org/10.1139/f07-176.

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Recovery plans for many endangered fishes include production of large numbers of individuals in hatcheries to augment wild populations. However, effects of hatchery culture on phenotypic development are poorly documented for most species. June sucker (Chasmistes liorus) is an endangered lake sucker endemic to Utah Lake (Utah, USA), and recovery plans include raising thousands of juveniles to stock in the lake. To determine effects of hatchery culture on morphology of young June sucker, we raised individuals from four different families in both lake and hatchery environments and compared shape

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Shrimpton, J. Mark, Nicholas J. Bernier, George K. Iwama, and David J. Randall. "Differences in Measurements of Smolt Development Between Wild and Hatchery-Reared Juvenile Coho Salmon (Oncorhynchus kisutch) Before and After Saltwater Exposure." Canadian Journal of Fisheries and Aquatic Sciences 51, no. 10 (1994): 2170–78. http://dx.doi.org/10.1139/f94-218.

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We compared the saltwater tolerance of coho salmon (Oncorhynchus kisutch) juveniles that were reared in different environments. The groups examined consisted of fish reared exclusively in the hatchery, a hatchery group transplanted into the upper watershed of the river (colonized), and wild fish from natural spawning broodstock in the river. Although hatchery fish were much larger than their wild or colonized counterparts, they consistently showed a reduced saltwater tolerance as assessed by a much greater perturbation in plasma sodium concentration following transfer to salt water. Within eac

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Hatanpää, Aurora, Hannu Huuskonen, Jukka Kekäläinen, et al. "Early winter foraging success, swimming performance, and morphology of juvenile landlocked Atlantic salmon reared under semi-wild and hatchery conditions." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 4 (2020): 770–78. http://dx.doi.org/10.1139/cjfas-2019-0079.

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Several Finnish populations of salmonids have been maintained exclusively by stocking hatchery-reared fish for several generations, and it is crucial to know whether domestication has affected fitness-related traits and to assess how the developmental environment influences fish phenotypes. Here, we focused on Lake Saimaa landlocked salmon (Salmo salar m. sebago) and studied the role of the early rearing environment in trait formation by comparing juveniles (fingerlings) from three backgrounds: (i) semi-wild (stocked as alevins), (ii) standard hatchery, and (iii) enriched hatchery conditions W

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Zhang, Z., R. J. Beamish, and B. E. Riddell. "Differences in otolith microstructure between hatchery-reared and wild Chinook salmon (Oncorhynchus tshawytscha)." Canadian Journal of Fisheries and Aquatic Sciences 52, no. 2 (1995): 344–52. http://dx.doi.org/10.1139/f95-035.

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Otolith microstructure exhibited some characteristic differences between hatchery-reared and wild chinook salmon (Oncorhynchus tshawytscha) from the Cowichan River. Daily growth increments that formed in the otoliths of the hatchery-reared chinook salmon after exogenous feeding were more regular in width and contrast than those in the otoliths of wild chinook salmon. In addition, otoliths from hatchery-reared individuals frequently produced a check when the fish were released from the hatchery. Eighty-nine percent of a sample of 67 chinook smolts that had been coded-wire tagged in hatcheries a

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Melnychuk, Michael C., Josh Korman, Stephen Hausch, David W. Welch, Don J. F. McCubbing, and Carl J. Walters. "Marine survival difference between wild and hatchery-reared steelhead trout determined during early downstream migration." Canadian Journal of Fisheries and Aquatic Sciences 71, no. 6 (2014): 831–46. http://dx.doi.org/10.1139/cjfas-2013-0165.

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We observed large survival differences between wild and hatchery-reared steelhead trout (Oncorhynchus mykiss) during the juvenile downstream migration immediately after release, which persisted through adult life. Following a railway spill of sodium hydroxide into the Cheakamus River, British Columbia, a short-term conservation hatchery rearing program was implemented for steelhead. We used acoustic telemetry and mark–recapture models to estimate survival of wild and (or) hatchery-reared steelhead during 4 years of the smolt migration, with both groups released in 2008. After adjusting for est

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15

Brauner, C. J., G. K. Iwama, and D. J. Randall. "The Effect of Short-duration Seawater Exposure on the Swimming Performance of Wild and Hatchery-reared Juvenile Coho Salmon (Oncorhynchus kisutch) during Smoltification." Canadian Journal of Fisheries and Aquatic Sciences 51, no. 10 (1994): 2188–94. http://dx.doi.org/10.1139/f94-220.

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The critical swimming velocity (Ucrit) and haematology of wild and hatchery-reared coho salmon (Oncorhynchus kisutch) juveniles were examined in either fresh water or seawater following a 24-h seawater challenge, at the time of smoltification. In fresh water, wild smolts swam faster than hatchery-reared fish but this could largely be accounted for by scaling for body size. Transfer to seawater significantly elevated resting plasma [Na+] and reduced subsequent Ucrit in hatchery fish (by 12%) relative to that determined in fresh water but had no significant effect on resting plasma [Na+] and Ucr

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16

Le Luyer, Jérémy, Martin Laporte, Terry D. Beacham, et al. "Parallel epigenetic modifications induced by hatchery rearing in a Pacific salmon." Proceedings of the National Academy of Sciences 114, no. 49 (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

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Hyvärinen, Pekka, and Petra Rodewald. "Enriched rearing improves survival of hatchery-reared Atlantic salmon smolts during migration in the River Tornionjoki." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 9 (2013): 1386–95. http://dx.doi.org/10.1139/cjfas-2013-0147.

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Low survival of stocked fish has been associated with fitness declines of the captive reared fishes because of genetic domestication and unnatural rearing environments. The effects of broodstock origin (wild or captive) or rearing method (standard or enriched) on survival and migration of hatchery-reared Atlantic salmon smolts (Salmo salar) were investigated in the Tornionjoki River using radiotelemetry. Smolts that were reared with enriched methods had a twofold increase in survival (∼38%) compared with smolts that had been reared in a standard hatchery environment (∼19%). Nature-caught smolt

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Larsen, Martin H., Jörgen I. Johnsson, Joacim Näslund, Søren T. Thomassen, and Kim Aarestrup. "Reduced rearing density increases postrelease migration success of Atlantic salmon (Salmo salar) smolts." Canadian Journal of Fisheries and Aquatic Sciences 73, no. 5 (2016): 804–10. http://dx.doi.org/10.1139/cjfas-2014-0563.

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The overall aim of this study was to investigate the effect of rearing density on the postrelease survival of Atlantic salmon (Salmo salar) smolts during seaward migration. Fish were either reared at conventional hatchery density or at one-third of conventional density. Three hundred 1-year-old smolts from each density treatment were individually tagged with passive integrated transponder tags and released 3.2 km upstream of a stationary antenna array in a natural stream. There were no significant differences in length, body mass, or condition between fish from the two density treatments durin

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Taylor, Matthew D., HKA Premachandra, David A. Hurwood, et al. "Genetic evaluation of the unknown contribution of stocked fish in angler catches: a case study using mulloway Argyrosomus japonicus." Bulletin of Marine Science 97, no. 4 (2021): 599–614. http://dx.doi.org/10.5343/bms.2020.0050.

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Stock enhancement involves the augmentation of wild populations with hatchery-reared recruits. Stock enhancement generally also includes a postrelease monitoring program which tracks stocked individuals within the fishery, and this relies on having a means to identify the likely origin of recaptured fish (e. g., physical, otolith, or genetic tags). This study reports the application of sibship analysis to retrospectively infer the origin of mulloway (Argyrosomus japonicus) within stocked estuaries when other means of identification were not available. Eight cohorts of mulloway were stocked int

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Putman, Nathan F., Amanda M. Meinke, and David L. G. Noakes. "Rearing in a distorted magnetic field disrupts the ‘map sense’ of juvenile steelhead trout." Biology Letters 10, no. 6 (2014): 20140169. http://dx.doi.org/10.1098/rsbl.2014.0169.

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We used simulated magnetic displacements to test orientation preferences of juvenile steelhead trout ( Oncorhynchus mykiss ) exposed to magnetic fields existing at the northernmost and southernmost boundaries of their oceanic range. Fish reared in natural magnetic conditions distinguished between these two fields by orienting in opposite directions, with headings that would lead fish towards marine foraging grounds. However, fish reared in a spatially distorted magnetic field failed to distinguish between the experimental fields and were randomly oriented. The non-uniform field in which fish w

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Freire, Rafael, Mathea Michie, Leia Rogers, and Shokoofeh Shamsi. "Age-Related Changes in Survival Behaviour in Parasite-Free Hatchery-Reared Rainbow Trout (Oncorhynchus mykiss)." Animals 14, no. 9 (2024): 1315. http://dx.doi.org/10.3390/ani14091315.

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Millions of hatchery-reared Rainbow trout are currently released in Australian waters to support recreational fisheries objectives, yet many of these fish die soon after release. In addition, little is known whether these fish harbour parasites that can potentially threaten freshwater ecosystems and human health. Here, we tested the behaviour of hatchery-reared trout using six tank-based tests at six different ages to evaluate their chances of survival and then dissected fish to investigate parasite prevalence. At 7 weeks of age fish readily emerged from a hide and showed the greatest number o

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Rodriguez Barreto, Deiene, Carlos Garcia de Leaniz, Eric Verspoor, Halina Sobolewska, Mark Coulson, and Sofia Consuegra. "DNA Methylation Changes in the Sperm of Captive-Reared Fish: A Route to Epigenetic Introgression in Wild Populations." Molecular Biology and Evolution 36, no. 10 (2019): 2205–11. http://dx.doi.org/10.1093/molbev/msz135.

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Abstract Interbreeding between hatchery-reared and wild fish, through deliberate stocking or escapes from fish farms, can result in rapid phenotypic and gene expression changes in hybrids, but the underlying mechanisms are unknown. We assessed if one generation of captive breeding was sufficient to generate inter- and/or transgenerational epigenetic modifications in Atlantic salmon. We found that the sperm of wild and captive-reared males differed in methylated regions consistent with early epigenetic signatures of domestication. Some of the epigenetic marks that differed between hatchery and

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Warren-Myers, Fletcher, Tim Dempster, Per Gunnar Fjelldal, Tom Hansen, and Stephen E. Swearer. "Immersion during egg swelling results in rapid uptake of stable isotope markers in salmonid otoliths." Canadian Journal of Fisheries and Aquatic Sciences 72, no. 5 (2015): 722–27. http://dx.doi.org/10.1139/cjfas-2014-0390.

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Determining the value of restocking wild fisheries with hatchery-reared fish requires the ability to identify and quantify the survival of hatchery fish after release. However, to obtain accurate estimates of survival rates, multiple fish identification techniques are often used, making the monitoring of restocking inefficient and costly. Here we test a new immersion marking method to determine its efficiency and cost effectiveness for marking millions of hatchery-reared Atlantic salmon (Salmo salar). Salmon eggs were marked during the egg swelling stage by immersing eggs in a solution contain

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Kirchoff, Nicole S., Trevan Cornwell, Staci Stein, Shaun Clements, and Thomas J. Sharpton. "Gut Microbial Composition of Pacific Salmonids Differs across Oregon River Basins and Hatchery Ancestry." Microorganisms 10, no. 5 (2022): 933. http://dx.doi.org/10.3390/microorganisms10050933.

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The gut microbiome may represent a relatively untapped resource in the effort to manage and conserve threatened or endangered fish populations, including wild and hatchery-reared Pacific salmonids. To clarify this potential, we defined how steelhead trout gut microbiome composition varies across watersheds and as a function of ancestry. First, we measured this variation across watersheds using wild steelhead trout sampled from nine locations spanning three river basins. While gut microbial composition differs across basins, there exist bacterial clades that are ubiquitous across all population

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Kalyakina, M. E., and E. Y. Litanyuk. "Scientific support of Pacific salmon otolith marking at hatcheries of Magadan Region in 2021–2022 fish breeding cycle." Researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean, no. 68 (October 24, 2023): 63–69. http://dx.doi.org/10.15853/2072-8212.2023.68.63-69.

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The paper presents data on monitoring the conditions and quality of otolith marking of incubationlarval material, and releases of Pacific salmon, reared at three fish hatcheries of the Magadan Region for the purpose of artificial reproduction. An effective assessment of marking chum, pink and coho salmon of the 2021 generation and the further possibility to identify adult hatchery-reared individuals during anadromous migration into the hatchery-home lakes or rivers.

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Barnett-Johnson, Rachel, Churchill B. Grimes, Chantell F. Royer, and Christopher J. Donohoe. "Identifying the contribution of wild and hatchery Chinook salmon (Oncorhynchus tshawytscha) to the ocean fishery using otolith microstructure as natural tags." Canadian Journal of Fisheries and Aquatic Sciences 64, no. 12 (2007): 1683–92. http://dx.doi.org/10.1139/f07-129.

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Quantifying the contribution of wild (naturally spawned) and hatchery Chinook salmon (Oncorhynchus tshawytscha) to the mixed-stock ocean fishery is critical to understanding their relative importance to the persistence of salmon stocks. The inability to distinguish hatchery and wild salmon has inhibited the detection of declines or recoveries for many wild populations. By using Chinook salmon of known hatchery and wild origin, we established a baseline for separating these two sources using otolith microstructure. Otoliths of wild salmon contained a distinct exogenous feeding check likely refl

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Madison, Barry N., John W. Heath, Daniel D. Heath, and Nicholas J. Bernier. "Effects of early rearing environment and breeding strategy on social interactions and the hormonal response to stressors in juvenile Chinook salmon." Canadian Journal of Fisheries and Aquatic Sciences 72, no. 5 (2015): 673–83. http://dx.doi.org/10.1139/cjfas-2014-0409.

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To determine whether early rearing environment and parental breeding strategy affect the social behaviour and the endocrine response to stressors in juvenile Chinook salmon (Oncorhynchus tshawytscha), offspring (1–2 g) from traditional hatchery breeding or parental mate choice breeding were reared in a hatchery setting or in seminatural channels. Once ∼30 g, 9-month-old hatchery and mate choice fish from both rearing environments were exposed to one of four treatments: (i) sampled, (ii) air-exposed (AE) for 60 s and sampled 1 h later, (iii) sampled after 5 days of continuous dyadic social inte

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Näslund, Joacim, Malin Rosengren, Diego Del Villar, et al. "Hatchery tank enrichment affects cortisol levels and shelter-seeking in Atlantic salmon (Salmo salar)." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 4 (2013): 585–90. http://dx.doi.org/10.1139/cjfas-2012-0302.

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Stocking programs using hatchery-reared salmon are often implemented for augmenting natural populations. However, survival of these fish is often low compared with wild conspecifics, possibly because of genetic, physiological, and behavioural deficiencies. Here, we compared presmolt Atlantic salmon (Salmo salar) from three different environmental treatments (barren environment, plastic tube enrichment, and plastic shredding enrichment) with regard to plasma cortisol levels, shelter-seeking behaviour, and fin deterioration. Basal plasma cortisol levels were higher in barren-reared fish, indicat

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Evans, David O., and Campbell C. Willox. "Loss of Exploited, Indigenous Populations of Lake Trout, Salvelinus namaycush, by Stocking of Non-Native Stocks." Canadian Journal of Fisheries and Aquatic Sciences 48, S1 (1991): 134–47. http://dx.doi.org/10.1139/f91-312.

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A deterministic, age-structured population model was developed to explore the combined effects of exploitation and stocking of hatchery-reared lake trout on native lake trout populations. Stocking of non-native lake trout at moderate to high exploitation rates caused loss of the recipient population, even when the stocked fish did not reproduce or interbreed with the native fish. If hatchery fish reproduce, their progeny mask the loss of the wild stock. At exploitation and stocking rates typical of lake trout populations in Ontario, the wild stock was replaced by the hatchery stock in a few ge

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Näslund, Joacim, Kim Aarestrup, Søren T. Thomassen, and Jörgen I. Johnsson. "Early enrichment effects on brain development in hatchery-reared Atlantic salmon (Salmo salar): no evidence for a critical period." Canadian Journal of Fisheries and Aquatic Sciences 69, no. 9 (2012): 1481–90. http://dx.doi.org/10.1139/f2012-074.

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In hatcheries, fish are normally reared in barren environments, which have been reported to affect their phenotypic development compared with wild conspecifics. In this study, Atlantic salmon ( Salmo salar ) alevins were reared in conventional barren hatchery trays or in either of two types of structurally enriched trays. We show that increased structural complexity during early rearing increased brain size in all investigated brain substructures. However, these effects disappeared over time after transfer to barren tanks for external feeding. Parallel to the hatchery study, a group of salmon

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Weber, Edward D., and Kurt D. Fausch. "Interactions between hatchery and wild salmonids in streams: differences in biology and evidence for competition." Canadian Journal of Fisheries and Aquatic Sciences 60, no. 8 (2003): 1018–36. http://dx.doi.org/10.1139/f03-087.

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Competition between hatchery-reared and wild salmonids in streams has frequently been described as an important negative ecological interaction, but differences in behavior, physiology, and morphology that potentially affect competitive ability have been studied more than direct tests of competition. We review the differences reported, designs appropriate for testing different hypotheses about competition, and tests of competition reported in the literature. Many studies have provided circumstantial evidence for competition, but the effects of competition were confounded with other variables.

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Jackson, Christopher D., and Grant E. Brown. "Differences in antipredator behaviour between wild and hatchery-reared juvenile Atlantic salmon (Salmo salar) under seminatural conditions." Canadian Journal of Fisheries and Aquatic Sciences 68, no. 12 (2011): 2157–66. http://dx.doi.org/10.1139/f2011-129.

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Captive rearing may elicit experiential or genetically based changes to salmonid antipredator behaviour, which may reduce survival of hatchery-reared fishes when they are released into the wild. Nevertheless, few studies have compared the behaviour between local wild-caught and local hatchery-reared fish (two generations or less), and none have done so under natural conditions. We conducted a seminatural field study comparing the antipredator behaviour of wild-caught, F1 (offspring of wild-caught adults) with that of F2 (second generation) hatchery-reared young-of-the-year Atlantic salmon ( Sa

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Chilcote, M. W., K. W. Goodson, and M. R. Falcy. "Reduced recruitment performance in natural populations of anadromous salmonids associated with hatchery-reared fish." Canadian Journal of Fisheries and Aquatic Sciences 68, no. 3 (2011): 511–22. http://dx.doi.org/10.1139/f10-168.

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We found a negative relationship between the reproductive performance in natural, anadromous populations of steelhead trout ( Oncorhynchus mykiss ), coho salmon ( O. kisutch ), and Chinook salmon ( O. tshawytscha ), and the proportion of hatchery fish in the spawning population. We used intrinsic productivity as estimated from fitting a variety of recruitment models to abundance data for each population as our indicator of reproductive performance. The magnitude of this negative relationship is such that we predict the recruitment performance for a population composed entirely of hatchery fish

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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 (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

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Parkyn, Daryl C., Debra J. Murie, and Edward T. Sherwood. "Salinity Preference in Hatchery-Reared Juvenile Red Drum." Scientific World JOURNAL 2 (2002): 1334–39. http://dx.doi.org/10.1100/tsw.2002.347.

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Juvenile red drum (Sciaenops ocellatus), reared in either 15- or 30-ppt salinity seawater, were tested to determine whether they develop preference for the salinity of the water in which they were cultured. In a two-choice test, large- and small-sized juvenile red drum chose the raceway that matched the seawater in which they were cultured over the other salinity. Additional large and small fish reared in either 15- or 30-ppt salinity water were also tested following a 4-h acclimation period that simulated the duration of transport time from the hatchery to a release site. These fish also show

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Tsuboi, Jun-ichi, Kohichi Kaji, Shinya Baba, and Robert Arlinghaus. "Trade-offs in the adaptation towards hatchery and natural conditions drive survival, migration, and angling vulnerability in a territorial fish in the wild." Canadian Journal of Fisheries and Aquatic Sciences 76, no. 10 (2019): 1757–67. http://dx.doi.org/10.1139/cjfas-2018-0256.

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Hatchery fish that support capture fisheries need to thrive in both hatchery and natural environments. We conducted joint experiments in both environments with individuals stemming from multiple generations held in captivity to test the performance of hatchery-reared ayu (Plecoglossus altivelis). Ayu is an annual, herbivorous, territorial, and amphidromous riverine fish native to Japan of high importance to recreational fisheries. Hatchery fish of the first hatchery generation exhibited poor growth and highest malformation rates relative to the second and following hatchery generations. The fi

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Munro, Andrew R., Bronwyn M. Gillanders, Travis S. Elsdon, David A. Crook, and Andrew C. Sanger. "Enriched stable isotope marking of juvenile golden perch (Macquaria ambigua) otoliths." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 2 (2008): 276–85. http://dx.doi.org/10.1139/f08-010.

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Stocking of native fish is a standard practice to aid in the recovery and enhancement of depleted populations. However, evaluating the effectiveness of these stocking programs has been hindered because of difficulty in distinguishing hatchery from wild fish, especially for species that are stocked as small, fragile fingerlings. Stable isotopes offer the potential to chemically mark fish with multiple marks that are distinct from each other and from natural signatures. Golden perch (Macquaria ambigua) fingerlings were reared in water enriched in 137Ba and combinations of 137Ba and 86Sr for vari

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Tverin, Malin, Janne Granroth, Alexander Abrahamsson, et al. "Adipose tissue fatty acids suggest spatial and temporal dietary differences in great cormorants of the Baltic Sea area." Journal of the Marine Biological Association of the United Kingdom 101, no. 1 (2021): 199–213. http://dx.doi.org/10.1017/s0025315420001320.

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AbstractIncreased numbers of great cormorants (Phalacrocorax carbo) in the Baltic Sea may have local impacts on fisheries and salmonid hatcheries. We studied spatial and temporal variability in cormorant diet, and potential consumption of hatchery salmonids, by analysing knee subcutaneous adipose tissue fatty acids (FA) of specimens (N = 77) collected along Swedish and Finnish coasts in different seasons during 2013–2017. The FA profiles of the subspecies sinensis and carbo were similar, with large individual variation. The proportion of C18 polyunsaturated FAs (PUFAs) was the largest in the n

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Härkönen, Laura, Pekka Hyvärinen, Juuso Paappanen, and Anssi Vainikka. "Explorative behavior increases vulnerability to angling in hatchery-reared brown trout (Salmo trutta)." Canadian Journal of Fisheries and Aquatic Sciences 71, no. 12 (2014): 1900–1909. http://dx.doi.org/10.1139/cjfas-2014-0221.

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Animals, including fish, display individually consistent behavioral differences that may affect an individual’s vulnerability not only to predation, but also to fishing. Compared with complex natural environments, plain hatchery environments might induce development of behaviors that increase vulnerability to fishing, which would in turn have major implications for the management of stocks by supportive releases. We studied whether the vulnerability of hatchery-reared brown trout (Salmo trutta) to angling could be predicted by rearing method (standard versus enriched) or behavioral variation t

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Brignone, Stefano, Luca Minazzi, Christophe Molina, Tiziano Putelli, and Pietro Volta. "How Much Hatchery-Reared Brown Trout Move in a Large, Deep Subalpine Lake? An Acoustic Telemetry Study." Environments 11, no. 11 (2024): 245. http://dx.doi.org/10.3390/environments11110245.

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Fish movement into large, deep lakes has been rarely investigated due to the complexity and extent of such ecosystems. Among the different monitoring methods available, acoustic telemetry enables the study of the spatial ecology and behavior of aquatic organisms in lentic environments. In this study, the movement of 69 hatchery-reared adult brown trout (size 43–61 cm) marked with acoustic transmitters was monitored in the large and deep subalpine Lake Lugano (Switzerland and Italy). Trout were tracked for six consecutive months by seven acoustic receivers (March–August 2022), positioned in a n

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Anttila, Katja, Matti Järvilehto, and Satu Mänttäri. "Ca2+ handling and oxidative capacity are greatly impaired in swimming muscles of hatchery-reared versus wild Atlantic salmon (Salmo salar)." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 1 (2008): 10–16. http://dx.doi.org/10.1139/f07-142.

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The swimming capacity of fish is strongly associated with muscle performance, although the prerequisites for effective movements have not been fully described at the molecular level. To compare the condition of swimming musculature of hatchery-reared Atlantic salmon (Salmo salar) with that of wild fish, we analyzed the relative level of two excitation–contraction coupling components (i.e., dihydropyridine receptor (DHPR) and ryanodine receptor (RyR)) and the oxidative capacity of muscles with histochemical and Western blot methods. The density of DHPR and RyR was considerably higher in swimmin

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Paszkowski, Cynthia A., and Bori L. Olla. "Foraging Behavior of Hatchery-Produced Coho Salmon (Oncorhynchus kisutch) Smolts on Live Prey." Canadian Journal of Fisheries and Aquatic Sciences 42, no. 12 (1985): 1915–21. http://dx.doi.org/10.1139/f85-237.

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We presented three groups of naive hatchery-produced, pellet-reared coho salmon (Oncorhynchus kisutch) with live, natural prey and observed their foraging behavior. Of 26 individuals examined, 20 captured one or more Crangon (sand shrimp) within 1 h of their first exposure to these prey. Six older [Formula: see text] accelerated smolts (underyearlings) displayed improved foraging performances with experience, capturing their first Crangon sooner during their second, compared with their first, exposure. Four of five of these fish successfully captured sand lance (Ammodytes hexapterus) within 1

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McCormick, Stephen D., Timothy F. Sheehan, Björn Thrandur Björnsson, et al. "Physiological and endocrine changes in Atlantic salmon smolts during hatchery rearing, downstream migration, and ocean entry." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 1 (2013): 105–18. http://dx.doi.org/10.1139/cjfas-2012-0151.

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Billions of hatchery salmon smolts are released annually in an attempt to mitigate anthropogenic impacts on freshwater habitats, often with limited success. Mortality of wild and hatchery fish is high during downstream and early ocean migration. To understand changes that occur during migration, we examined physiological and endocrine changes in Atlantic salmon (Salmo salar) smolts during hatchery rearing, downstream migration, and early ocean entry in two successive years. Gill Na+/K+-ATPase activity increased in the hatchery during spring, increased further after river release, and was sligh

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Stekol’Shchikova, Marina Yu. "Some results of monitoring for the pink salmon hatchery stocks from the Aniva Bay (Sakhalin Island)." Izvestiya TINRO 183, no. 4 (2015): 51–60. http://dx.doi.org/10.26428/1606-9919-2015-183-51-60.

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Several population parameters (length and dynamics of spawning run, size-sex composition, variability of morphological and physiological characteristics) are determined and indices of survival are calculated for the pink salmon hatchery stocks from the Aniva Bay of the 2008-2011 generations on the base of the cultured pink salmon differentiation by thermal marks on otoliths. The hatchery pink salmon begin their migration to the bay rivers in late July, together with the wild fish. Size-weight parameters of the fish and their variability are similar for the hatchery and wild stocks in this peri

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Whitcomb, Amelia C., Michael A. Banks, and Kathleen G. O’Malley. "Influence of immune-relevant genes on mate choice and reproductive success in wild-spawning hatchery-reared and wild-born coho salmon (Oncorhynchus kisutch)." Canadian Journal of Fisheries and Aquatic Sciences 71, no. 7 (2014): 1000–1009. http://dx.doi.org/10.1139/cjfas-2013-0501.

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Hatcheries support fisheries and aid in the recovery of endangered wild populations. Evidence for reduced reproductive success (RS) in wild-spawning hatchery-reared salmon compared with that in wild-born fish invites questions about the impact on subsequent generations. Immune gene-dependent mate preference is one mechanism known to influence salmonid fitness. We evaluated mate choice and correlates of RS to better understand fitness differences between hatchery-reared and wild-born fish using a previously constructed genetic pedigree of coho salmon (Onchorhynchus kisutch) from the Umpqua Rive

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Kellison, G. T., D. B. Eggleston, and J. S. Burke. "Comparative behaviour and survival of hatchery-reared versus wild summer flounder (Paralichthys dentatus)." Canadian Journal of Fisheries and Aquatic Sciences 57, no. 9 (2000): 1870–77. http://dx.doi.org/10.1139/f00-139.

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We describe the use of laboratory trials to compare substrate-specific behaviour and susceptibility to predation of hatchery-reared (HR) versus wild summer flounder (Paralichthys dentatus) juveniles. HR fish spent significantly more time swimming in the water column than wild fish and took significantly longer to become cryptic on the benthos than wild fish, regardless of substrate type. In predation trials with a blue crab (Callinectes sapidus) predator, naïve HR fish were significantly more susceptible to predation than wild fish. Antipredator-conditioned HR fish were significantly less susc

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Linløkken, Arne N., Stein I. Johnsen, and Wenche Johansen. "Genetic Diversity of Hatchery-Bred Brown Trout (Salmo trutta) Compared with the Wild Population: Potential Effects of Stocking on the Indigenous Gene Pool of a Norwegian Reservoir." Diversity 13, no. 9 (2021): 414. http://dx.doi.org/10.3390/d13090414.

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This study was conducted in Lake Savalen in southeastern Norway, focusing on genetic diversity and the structure of hatchery-reared brown trout (Salmo trutta) as compared with wild fish in the lake and in two tributaries. The genetic analysis, based on eight simple sequence repeat (SSR) markers, showed that hatchery bred single cohorts and an age structured sample of stocked and recaptured fish were genetically distinctly different from each other and from the wild fish groups. The sample of recaptured fish showed the lowest estimated effective population size Ne = 8.4, and the highest proport

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Mierzejewska, Katarzyna, Piotr Dynowski, Katarzyna Stańczak, et al. "Acoustic telemetry data on lake-migratory brown trout, Salmo trutta lacustris L., behavior in Lake Hańcza, northeastern Poland, within one year of release." Fisheries & Aquatic Life 30, no. 1 (2022): 14–26. http://dx.doi.org/10.2478/aopf-2022-0002.

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Abstract The poor results of lake-migratory brown trout, Salmo trutta lacustris L., restoration in Lake Hańcza Nature Reserve prompted undertaking the current study that sought to verify if hatchery-reared fish age 2+ can survive the critical period of acclimation and remain in the lake. Thirty-one individuals were tagged with coded acoustic transmitters and observed for 317 days. This method helped to analyze: 1) the spatial behavior of tagged fish for one year following their release; 2) the possible differences in the behavior of fish released in various places habitually used for stocking.

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Katturi, Rameshu, Lalitha Vinnakota, and Venkata Rathnamma. "Comparative study on the survival and growth performance of white shrimp Penaeus vannamei in ponds cultured with hatchery and nursery reared post larvae." International Journal of Fisheries and Aquatic Studies 11, no. 1 (2023): 1–6. https://doi.org/10.22271/fish.2023.v11.i1a.2761.

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Katturi, Rameshu, Vinnakota, Lalitha, Rathnamma, Venkata (2023): Comparative study on the survival and growth performance of white shrimp Penaeus vannamei in ponds cultured with hatchery and nursery reared post larvae. International Journal of Fisheries and Aquatic Studies 11 (1): 1-6, DOI: 10.22271/fish.2023.v11.i1a.2761, URL: http://dx.doi.org/10.22271/fish.2023.v11.i1a.2761

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Bigelow, John P., Wendy M. Rauw, and Luis Gomez-Raya. "Acclimation Improves Short-Term Survival of Hatchery Lahontan Cutthroat Trout in Water From Saline, Alkaline Walker Lake, Nevada." Journal of Fish and Wildlife Management 1, no. 2 (2010): 86–92. http://dx.doi.org/10.3996/012010-jfwm-001.

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Abstract We investigated the effectiveness of two acclimation protocols for 8-month-old Lahontan cutthroat trout Oncorhynchus clarkii henshawi, reared at Lahontan National Fish Hatchery in terms of survival during a week-long challenge in water from saline, alkaline Walker Lake, Nevada. Fish were acclimated for 0 (control), 3, and 8 d by increasing the ratio of lake water to hatchery water. For the 3-d acclimation treatment, 50% of the tank water was replaced with lake water each day. For the 8-d treatment, 33% of the water was replaced with lake water on the first through fourth day of acclim

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