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Report: Survival Rates of Fry Released in the Headwaters of the Suskwa and Zymoetz Rivers - A Preliminary Assessment 1987

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This report summarizes a fry release program begun on experimental basis in 1979. The report is 25 pages long. For a report summary see the long description.

Author:  Schultze, C.G. and M.J. Lough

Old Reference Number:  sk63

Date Published:  Jan 1987

Report ID:  1681

Audience:  Government and Public

Report summary: The B.C. Fish and Wildlife Branch began stocking Skeena River tributaries with juvenile summer-run steelhead (Salmo gairdneri) in 1979. Initially, both smolt releases and fry releases were attempted on an experimental basis, but in 1981 the smolt program was abandoned in favor of the fry program because: i) The release of fry before winter was desireable because expensive overwintering water heating costs could be avoided. ii) Smolts produced from fry releases were deemed more desireable both socially and biologically than hatchery produced smolts. iii)Fish culture facilities with smolt production capability were limited in the north. iv)Two-year smolt rearing programs did not produce significant returns. The first release of 15,000 fry was a pilot project in the headwaters of the Suskwa River in 1979. The scale of the Skeena fry program was increased gradually until present production levels of approximately 350,000 fry were reached in 1985. Some fry from the 1979 - 1982 releases were marked with fin or maxillary clips, primarily to assess freshwater survival at the release sites. Beginning in 1985 however, all fry were adipose clipped and implanted with a coded wire nose tag so that run timing information could be obtained from returning adults. In order to assess the effectiveness of the Skeena fry stocking program, information of marked recaptures was examined. Sizeable returns of marked steelhead adults are not expected until 1990, but sparse data from early pilot projects was examined as a preliminary indication of the survival of fry released in Skeena River tributaries.

Report Type
  Fish and Aquatic Habitat Information
 
Subject
  Fish Species - Steelhead - Oncorhynchus mykiss
  Region - Skeena
  Fish and Fish Habitat - Stock Assessment
  Watershed Groups - 460 - Bulkley River
 


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