Post-stocking Movements and Recapture of Hatchery-reared Trout Released into Flowing Waters - Effect of a Resident Wild Population

Cresswell, Richard; Williams, Ruth

doi:10.1111/j.1365-2109.1984.tb00577.x

Cited by 3 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Stocked fish also lost condition during this period. A similar phenomenon has been reported by Needham & Slater (1944), Hunt & Jones (1972), O'Grady (1981), Ersbak & Haase (1983) and Cresswell & Williams (1984). In the first year no stocked fry survived beyond October.…”

Section: Discussionsupporting

confidence: 85%

Survival of stocked hatchery-reared brown trout, Salmo trutta L., fry in relation to the carrying capacity of a trout nursery stream

Kelly‐Quinn¹,

Bracken²

1989

Aquaculture Res

View full text Add to dashboard Cite

Abstract. During the period June 1982‐84 hatchery‐reared brown trout, Salmo trutta L., fry were Stocked into stretches of the Owendoher. a trout nursery stream on the east coast of Ireland. These experiments were designed to examine the survival of stocked fry and to estimate the carrying capacity of the system. During the first year fry were stocked into sectors already supptorting wild fish at densities normal for the system. In the following year fry numbers were artificially reduced prior to stocking with the hatchery‐reared fish. Mortality of the stocked fry was high after release with less than 33% of the fish surviving beyond the first 3 weeks. No stocked fish survived after October 1982. In the second year, however, 2‐9% of the fish survived. The best survival rates were achieved where wild fry numbers were lowest. Regardless of the initial stocking density the various experiments yielded autumn fry densities (0.07‐0.7 fish/m2) similar to those at unstocked sites (0.1‐0.62 fish/m2). Stocking did not increase recruitment to the 1+ group and again 1+ densities (0.15‐0.35 fish/m2) similar to unstocked sites (0.07‐0.39 fish/m2) were obtained at the end of each year. These results suggest that spawning and recruitment in the Owendoher yield population densities approaching the maximum carrying capacity of the stream. The system appears to support a maximum summer fry density in the region of 1 fish/m2 and a maximum autumn density of 0.7 fish/m2.

show abstract

Section: Discussionsupporting

confidence: 85%

Survival of stocked hatchery-reared brown trout, Salmo trutta L., fry in relation to the carrying capacity of a trout nursery stream

Kelly‐Quinn¹,

Bracken²

1989

Aquaculture Res

View full text Add to dashboard Cite

show abstract

“…In studies similar to the present one, very low recapture rates of fingerling brown trout planted in streams were recorded (Johnson 1983;Cresswell & Williams 1981;Kelly-Quinn & Bracken 1989). The plantings in Laktabacken Creek seemed to be more successful in terms of the survival of stocked fish.…”

Section: ; Heggenes 1988) It Seems Probable That the Redistributsupporting

confidence: 70%

Survival and distribution of pond- and hatchery-reared 0+ brown trout, Salmo trutta L., released in a Swedish stream

Näslund

1992

Aquaculture Research

View full text Add to dashboard Cite

During 1985-88, a tola! of 17500 under-yearling (0+) brown trout. 5a/mo/ru/W L., were released in Laktabacken Creek in Swedish Lapland. Of these, 15500 had been reared in a pond adjacent to the creek during their first summer, where they fed on natural prey. The other 2000 were conventionally reared hatchery fish fed dry food pellets. All fish were released in the autumn (size 6O-70mm) at the confluence of the pond outlet and the creek. Electrofishing revealed that the stocked fish gradually spread downstream from the point of release at the expense of the resident wild trout population. In 1989, stocked fish accounted for 70-90% and 30-50% of the trout population in the upper and lower stretches of the creek respectively. No long-term changes in total trout densities or standing crop occurred as a result of stocking.First-year survival of fish released in the creek varied between 15 and 30% over the 4 years. After 3 years, 5% of the slocked fish remained in the creek. Planted fish grew less rapidly than wild fish during the first year in the creek. Pond fish had a highersurvival rate than hatchery fish and showed a greater propensity to disperse from the point of release.

show abstract

“…Because far more rainbow trout were stocked in Buffalo Bill Reservoir than into the North Fork Shoshone River and its tributaries directly, we also calculated distance from each sampling site to the confluence of the North Fork Shoshone River with Buffalo Bill Reservoir, using NHDPlusV2 river shapefiles for this basin (National Hydrography Data set; McKay et al, ) and the riverdist package in R (Tyers, ), and used this distance as a predictor variable in our models. Previous studies of introduced rainbow trout suggest that many individuals remain close to their stocking location, but a subset disperse (Bennett et al, ; Cresswell & Williams, ) and several studies suggest that distance from stocking locations of introduced rainbow trout can influence hybridization outcomes with cutthroat trout, or use indices of propagule pressure that include distance to quantify rainbow trout stocking (Bennett et al, ; Gunnell, Tada, Hawthorne, Keeley, & Ptacek, ; Muhlfeld et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…Since stocking history is likely to have directly affected ratios of Yellowstone cutthroat to rainbow trout in the North Fork Shoshone River basin, and therefore the probability of interspecific hybridiza- Tyers, 2017), and used this distance as a predictor variable in our models. Previous studies of introduced rainbow trout suggest that many individuals remain close to their stocking location, but a subset disperse (Bennett et al, 2010;Cresswell & Williams, 1981) and several studies suggest that distance from stocking locations of introduced rainbow trout can influence hybridization outcomes with cutthroat trout, or use indices of propagule pressure that include distance to quantify rainbow trout stocking (Bennett et al, 2010;Gunnell, Tada, Hawthorne, Keeley, & Ptacek, 2008;Muhlfeld et al, 2017).…”

Section: Environmental and Ecological Correlates Of Hybridizationmentioning

confidence: 99%

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

et al. 2019

View full text Add to dashboard Cite

Hybridization can profoundly affect the genomic composition and phenotypes of closely related species, and provides an opportunity to identify mechanisms that maintain reproductive isolation between species. Recent evidence suggests that hybridization outcomes within a species pair can vary across locations. However, we still do not know how variable outcomes of hybridization are across geographic replicates, and what mechanisms drive that variation. In this study, we described hybridization outcomes across 27 locations in the North Fork Shoshone River basin (Wyoming, USA) where native Yellowstone cutthroat trout and introduced rainbow trout co‐occur. We used genomic data and hierarchical Bayesian models to precisely identify ancestry of hybrid individuals. Hybridization outcomes varied across locations. In some locations, only rainbow trout and advanced backcrossed hybrids towards rainbow trout were present, while trout in other locations had a broader range of ancestry, including both parental species and first‐generation hybrids. Later‐generation intermediate hybrids were rare relative to backcrossed hybrids and rainbow trout individuals. Using an individual‐based simulation, we found that outcomes of hybridization in the North Fork Shoshone River basin deviate substantially from what we would expect under null expectations of random mating and no selection against hybrids. Since this deviation implies that some mechanisms of reproductive isolation function to maintain parental taxa and a diversity of hybrid types, we then modelled hybridization outcomes as a function of environmental variables and stocking history that are likely to affect prezygotic barriers to hybridization. Variables associated with history of fish stocking were the strongest predictors of hybridization outcomes, followed by environmental variables that might affect overlap in spawning time and location.

show abstract

Post-stocking Movements and Recapture of Hatchery-reared Trout Released into Flowing Waters - Effect of a Resident Wild Population

Cited by 3 publications

References 6 publications

Survival of stocked hatchery-reared brown trout, Salmo trutta L., fry in relation to the carrying capacity of a trout nursery stream

Survival of stocked hatchery-reared brown trout, Salmo trutta L., fry in relation to the carrying capacity of a trout nursery stream

Survival and distribution of pond- and hatchery-reared 0+ brown trout, Salmo trutta L., released in a Swedish stream

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

Contact Info

Product

Resources

About