Further Experiments in Fishway Capacity 1957

This is the second progress report on studies to determine the maximum number of fish that a fishway may pass per unit time (capacity). The test fishway was a pool-and-overfall type, 4 feet wide, with a slope of 1 on 16 and a mean depth of 6.3 feet. Maximum observed entry and exit of salmonids are discussed as they relate to the determination of capacity. A sustained passage of 50 fish a minute was observed in a test in which the average weight per fish was 9 pounds. Behavior and performance of the fish were also examined. Results cited suggest that certain experimental techniques may have influenced behavior of fish in the fishway