Upstream Migration Timing of Columbia Basin Chinook and Sockeye Salmon and Steelhead in 2012
In 2012 we sampled sockeye and Chinook salmon as well as steelhead at the Bonneville Dam Adult Fish Facility. Fish were measured for length and scales collected for later analysis for age 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, weirs, as well as in-stream antennas. Total numbers of fish tracked upstream were 939 spring Chinook, 390 summer Chinook, 1457 fall Chinook, 1451 steelhead, and 1601 sockeye salmon.
Chinook migration rates between mainstem dams ranged between 22.1 and 39.3 km/day. Most spring Chinook salmon that traveled upstream of McNary Dam were last detected in the Snake River, most summer Chinook were last detected in the Columbia River upstream of Priest Rapids Dam, and the majority of fall Chinook passed upstream of McNary Dam. Escapement estimates for the entire Chinook run derived from PIT tag detections result in estimates differing from those estimated by visual counts by -18.1% to +7.4% at mainstem dams.
Steelhead median rates between mainstem dams ranged from 15.8 km to 28.2 km/day. Steelhead classified as B-run (greater or equal to 78 cm fork length) were overwhelmingly last detected in the Snake River. Based on the data reported, the percentage of steelhead classified as B-run at Bonneville Dam peaked on our last week of sampling in early October at 52.5% of the total steelhead run, with the estimated weekly number of B-run steelhead peaking in that same week at just over 4,200 fish. A total of 58 PIT tagged steelhead tracked in 2012 were detected moving downstream (mostly in juvenile bypasses) after March 31, 2013 presumably in an attempt to return to the ocean after spawning.
The estimated stock composition of sockeye salmon passing Bonneville Dam was 82.4% Okanogan, 17.6% Wenatchee, and 0.0% Snake. Upstream survival of sockeye salmon was highest early and late in the run.
The mean migration rate between Bonneville and Rock Island Dam was 31.0 km per day. Sockeye passing Bonneville Dam later in the migration traveled upstream faster than those earlier in the migration.
Fryer, J.K., J. Whiteaker, and D. Kelsey. 2014. Upstream Migration Timing of Columbia Basin Chinook and Sockeye Salmon and Steelhead in 2012. Columbia River Inter-Tribal Fish Commission Technical Report 14-02 for U.S. Dept. of Energy Bonneville Power Administration Project 2008-518-00. 99p.