Following the release of 11,400 summer run steelhead fry and initial post-release assessment in 1979, another 47,000 fry were released to Silverhope Creek (above Silver Lake) in late July 1980. A further assessment of survival from both the 1979 and 1980 releases (1979 yearlings and 1980 fry) was conducted in late August 1980. The mean sampled density of age (1+) steelhead/rainbow (44% hatchery; survivors from 1979 releasaes) was approximately four times the sampled mean in 1979 and seven times that in 1978. The total estimated number of hatchery yearlings surviving from the 1979 releases was 1101 fish, suggesting a survival rate of 9.7% from the time of release (mid-July 1979) to August 1980 census. Ultimate smolt yield and adult return from the 1979 releases is now estimated at 749-881 smolts and 30-35 adults. The mean sampled density of steelhead/rainbow fry in 1980 was approximately 5.7 times that sampled in 1978 (prior to releases). The total number of survivors from the 1980 fry release was estimated at
Griffith, R.P.. 1981. The Enhancement of Summer Run Steelhead in Silverhope Creek: Progress in 1980. Ministry of Environment. Fisheries Report. FRN157
Topic: Fish and Fish Habitats
Keywords: steelhead, rainbow trout, Silverhope Creek, management, enhancement, hatchery, survival, biomass, density
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