Juvenile Salmonid Emigration Monitoring in the Stanislaus River at Oakdale, California, 1996-2023

The operation of the rotary screw trap on the lower Stanislaus River at Oakdale Recreation Area is one of the longest-running datasets (1996-2023) in the Central Valley for juvenile salmonids. The primary objectives of the study are to collect data that can be used to estimate the passage of juvenile fall-run Chinook Salmon ( Oncorhynchus tshawytscha ) and to quantify the raw catch of Oncorhynchus mykiss . Secondary objectives of the trapping operations focus on collecting biological data on juvenile salmonids and gathering environmental data that will be used to develop models that correlate environmental parameters with salmonid size, temporal presence, abundance, and production.