Adult fish counts

Returns to the Columbia River Mouth by Year. Adults generally spend one to two years in the ocean before returning to spawn and die in the stream where they were born. Daily Adult Salmon Dam Counts The adult passage counting schedule and ladder outage schedule for the current year are presented below. When They Pass The Dams Shad can be seen in the fish ladders on lower Columbia River dams from May to August. A relatively small number of Chinook were observed during the time of equipment failure, and it was not possible to use linear regression analysis to predict missed numbers of fish. LPS were opened in and counting started in June Body shaped like an eel Three-toothed suction-cup mouth Skeleton make of cartilage Life span of 7 years or more Female lays between 34, and , eggs Worm-like larvae young Returning adult average size 22 to 28 inches When They Pass The Dams Lamprey can be seen in the fish ladders of lower Columbia River dams from June to August.

These data are furnished with the understanding that the Corps of Engineers makes no warranties concerning the accuracy, reliability, or suitability of the data for any particular purpose. It takes most of the day to accurately review one day of fish passage on tape when the counts are high. Wells Dam, Lamprey Research,