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Conclusions
Growing population of cormorants in middle and lower river. Pelicans more common at Roza and Selah. Cormorants more significant smolt predators than pelicans and herons. Coho preferred prey followed by spring chinook and fall chinook.
Based on PIT sampling higher number of heron predated smolts were found than anticipated.
- Are coho smolts vulnerable to herons in river sloughs during low water periods?
Presence of steelhead and fall chinook tags from the lower Yakima, Columbia and Snake Rivers, indicate some pelicans move between the Columbia and Yakima Rivers, and up/down the Yakima River.
Notes: