Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 7022
Title: Biological manipulation of migration rate: the use of advanced photoperiod to accelerate smoltification in yearling Chinook salmon, 1988
Author/Editor: Albert E. Giorgi, William D. Muir, Waldo S. Zaugg, Clinton Scott McCutcheon
Publication Year: 1990
Publisher: National Marine Fisheries Service
Contracting Agency: Bonneville Power Administration. Portland, Oregon
Contract Number: DE-AI79-88BP50301
Project Number: 88-141
Date: 1990

Research was conducted to assess the feasibility of biologically manipulating physiological development and migratory behavior of yearling spring chinook salmon, Oncorhynchus tshawytscha.  At Dworshak National Fish Hatchery, a treatment group was exposed to a 3–month advanced photoperiod cycle for 14 weeks preceding release.  Physiological development and migratory performance of this group was compared to a control group.  Changes in physiological indices indicated that exposing fish to an advanced photoperiod treatment increased the rate of smolt development.  Photoperiod treatment also altered passage patterns and timing at Lower Granite Dam.