Green River Juvenile Salmonid Production Evaluation: 2008 Annual Report.

摘要

This report provides results from the juvenile salmonid production study conducted on the Green River in 2008. The primary objective of this project was to estimate natural-origin production of Puget Sound Chinook in the Green River. Additional objectives were to evaluate environmental variables contributing to Chinook survival and to estimate the production of other Green River salmonids. Juvenile salmonids were captured in a five-foot screw trap located at river mile 34.5 (55 rkm). Production estimates were made using a time-stratified mark-recapture approach that relied on release and recapture of marked fish throughout the period of outmigration. A Petersen-Chapman estimator was used to calculate juvenile migration and its variance during each time stratum. The sum of all strata provided the total production estimate.