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The catch from the rotary screw trapThe rotary screw trap is a device that nondestructively traps fish in a waterway. Fish are kept alive in the trap's holding area, and released once they are counted and measured by biologists. The trap is a great tool for monitoring the number of Steelhead trout and Chinook salmon smolts that are migrating out to the ocean in the spring.
The RCD monitors a rotary screw trap located in the Napa River in the spring. The trap is checked every day that flows accommodate the trap. Although the trap doesn't catch every fish that is moving through the river, it catches enough to give us a snapshot of the population size of salmon and trout, as well as the diversity of fish that live in the watershed.
Report explaining 2011 results Learn more about fish monitoring and the 2010 and 2009 catch here
2011 Fish Count - TotalFishing period: April 6 to June 17
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