Stanislaus River Survival Study
In spring 2012-2014, Cramer Fish Sciences (CFS) conducted a multi-year mark-recapture experiment
funded by the U.S. Fish and Wildlife Service (USFWS) Anadromous Fish Restoration Program (AFRP:
Grant #81332BG003) to estimate survival of radio-tagged juvenile Chinook Salmon Oncorhynchus
tshawytscha emigrating through the lower Stanislaus River (LSR) between the Oakdale Recreation
Area rotary screw trap (RST) located at river km (rkm) 64.4 and the Caswell Memorial State Park
RST located at rkm 14.4. A series of paired releases were performed along the approximately 50-km
study reach in six roughly equal sub-reaches. The two releases were performed about a month apart
to examine survival under different flow regimes. Mobile telemetry was performed to monitor daily
movements (for up to 14 days following release) and outmigration behavior of experimental fish in
relation to potential mortality sources (e.g., predator pools, agricultural diversions, etc.).
Each year, additional fish were tagged and observed in a laboratory setting to assess post-surgery
survival, tag retention, and behavioral effects of implanted tags.
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