Title

Survival of juvenile rainbow trout passing through a Francis turbine

Authors

M Dedual

Publication Date

2007

Keywords

Francis turbine, handling, juvenile, mortality, New Zealand, rainbow trout, releases, survival, trout

Journal or Book Title

North American Journal of Fisheries Management

Abstract

The immediate survival rate of juvenile rainbow trout Oncorhynchus mykiss (fork length, 81 +/- 1 mm) that passed through a Francis turbine at Hb Dam on the Hinemaiaia River in the central North Island of New Zealand was estimated at 95.6 +/- 1.1% (mean +/- SE). The survival rate decreased to 93.1 +/- 1.4% after 24 It and remained unchanged after 96 h. The survival rate was derived using maximum likelihood estimators for a tag-recapture model involving three releases of 200 fish of similar average length, and the mortality due to handling was estimated using a control of 200 similarly sized fish. The high survival of juvenile rainbow trout (< 80 mm) passing through the Francis turbine at Hb power station provides a safe route for fish migrating downstream from Hb Lake into the Hinemaiaia River and Lake Taupo

Pages

181-186

Volume

27

Issue

1

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