Identification of the Spawning, Rearing, and Migratory Requirements of Fall Chinook Salmon in the Columbia River Basin, Annual Report 1995.

This document is the 1995 annual progress report for selected studies of fall chinook salmon Oncorhynchus tshawytscha conducted by the Biological Resources Division (BRD) of the U.S. Geological Survey and the U.S. Fish and Wildlife Service. Activities were funded by the Bonneville Power Administration (BPA) through funding of Project 91-029. The decline in abundance of fall chinook salmon in the Snake River basin has become a growing concern. In 1992, Snake River fall chinook salmon were listed as {open_quotes}threatened{close_quotes} under the Endangered Species Act. Effective recovery efforts for fall chinook salmon cannot be developed until we increase our knowledge of the factors that are limiting the various life history stages. This study attempts to identify those physical and biological factors which influence spawning of fall chinook salmon in the free-flowing Snake River and their rearing and seaward migration through Columbia River basin reservoirs.