Title

Further Studies on Fishway Slope and Its Effect on Rate of Passage of Salmonids

Publication Date

1963

Keywords

Bonneville Dam, chinook, Dalles Weir crest, fish passage, Oncorhynchus tshawytscha, pool, rate of passage, salmon, salmonids, slope, steelhead, trout, weir

Journal or Book Title

Fishery Bulletin

Abstract

The rates of passage of chinook (Oncorhynchus tshawytscha) and sockeye (O. nerka) salmon and steelhead trout (Salmo gairdneri) were studied in 1:16- and 1:8-slope, pool-and-overfall fishways. In general, the passage of salmonids through the 1:8-slope fishway was a 1.0-foot rise between pools was as fast as, or faster than, in the 1:16-slope fishway with a 1.0-foot rise. When the rise between pools was increased to 1.5 feet in the 1:8-slope fishway, chinook and sockeye were slower. The 'Dallas-type' weir crests in a 1:16-slope fishway appeared to accelerate chinook passage. Chinook and sockeye displayed seasonal differences in times within species.

Pages

45-62

Volume

63

Issue

1

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