Upstream Migration Timing of Columbia Basin Chinook and Sockeye Salmon and Steelhead in 2020
Abstract
Between May 21 and October 16, 2020, Chinook (Oncorhynchus tshawytscha) and Sockeye (Oncorhynchus nerka) salmon as well as steelhead (Oncorhynchus mykiss) were sampled at the Bonneville Dam Adult Fish Facility (AFF). Fish were measured for fork length, scales were collected for analysis of age, tissue samples collected for genetic analysis, and the fish were tagged with Passive Integrated Transponder (PIT) tags. These fish were tracked upstream as they passed through sites with PIT tag antennas, including fish ladders at dams, juvenile bypasses, hatcheries, and weirs, as well as in-stream antennas. Total numbers of fish tracked upstream were 194 spring Chinook, 1,074 summer Chinook, 2,003 fall Chinook, 1,474 steelhead, and 1,730 Sockeye Salmon. Our Spring Chinook sample size was greatly reduced as the US Army Corps of Engineers (which provides access to the AFF) did not allow sampling to begin at Bonneville Dam until May 21, 2020, by which time 71.6% of the spring Chinook run had already passed the site.
Authors
Citation
Fryer, J.K., J. Whiteaker, D. Kelsey, and J. Hess 2022. Upstream migration timing of Columbia Basin Chinook and Sockeye Salmon and steelhead in 2020. Columbia River Inter-Tribal Fish Commission Technical Report 22-03, for U.S. Dept. of Energy Bonneville Power Administration Project 2008-518-00. Portland, OR. 170p.