Development of a System-Wide Predator Control Program: Stepwise Implementation of a Predation Index, Predator Control Fisheries, and Evaluation Plan in the Columbia River Basin; Northern Pikeminnow Management Program, 1999 Annual Report.

In 2001, the Yakama Nation crew angled for Northern pikeminnow (NPm) at Bonneville, The Dalles and John Day Dams during the months between May and August. Angling and data collection methods were the same as in 2000, where the crew measured its effort generally as time spent on the dam rather than as time spent actively angling. The crew caught 2,751 NPm > 200mm FL in 1530.5 angling hours, for a seasonal catch per angler hour (CPAH) of 1.79. Relative to 2000, catch increased 650% and effort increased by 12% as well. Increase in catch can be attributed a longer angling season and to the low water year and throughout the lower Columbia River the Corp was not spilling water over the dams.