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Rainbow trout inhabiting the Upper Nechako River were studied to document the population size, to determine the effectiveness of a sportfishery closure, and to evaluate the survival of stocked juvenile trout. Population enumeration and sampling was conducted at an upper "index reach" from 1983 (pre-closure) to 1986 (post-closure). Numbers and standing crop of catchable wild trout (>20 cm) increased 2 and 3.2 fold, respectively. Corresponding increases in mean size of trout, age, and spawning frequency also occurred. Mean weight increased 64%, and 18% of the trout were >0.05 kg by 1985 in contrast to 0% >0.45 kg prior to the closure. Standing crop of wild trout in the index reach in 1986 approached earlier predictions of carrying capacity (Slaney et al. 1984 MS). At other sites, examined less intensively, trout were less abundant, although size and age structure were similar. Survival of stocked juvenile trout (Premier Lake strain) was exceptionally low (1-2%) within the 10 km stocking site; fish apparently mo
Slaney, P.A.. 1986. An Assessment of the Rainbow Trout (Salmo gairdneri) Population in the Upper Nechako River and the Effects of a Sportfishery Closure. Ministry of Environment and Parks. Fisheries Management Report. FMR89
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