Northwest Fisheries Science Center

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Document Type: Chapter or Section
Center: NWFSC
Document ID: 7736
Type of Book: Technical
Section or Chapter Title: Exploratory experiments on the deflection of juvenile salmon by means of water and air jets. Report No. 14
Book Title: Fish-Passage Research Program review of progress 1964, Volume III
Author: Daniel W. Bates, John G. VanDerwalker
Editor: Gerald B. Collins, Carl H. Elling (Eds.)
Publication Year: 1964
Publisher: Report of the Accelerated Fish-Passage Research Program to the U.S. Bureau of Commercial Fisheries. Seattle, Washington

The need is urgent for an effective, low-cost method of guiding and collecting juvenile salmonids from rivers and streams.  Present techniques require costly screening of flow, and where flow volumes are high a structure is both massive and expensive.  In addition, the maintenance costs for such facilities are also high and continuing.  It is necessary, therefore, to develop a fish guiding and collecting system, which by minimizing the problem of debris, will reduce maintenance costs.

The development of louvers was a partial advance in this direction.  Research on sound, lights, air-bubble acreens, and electricity has been directed toward achieving this same end.  However, the results have never been sufficiently successful to warrant field application.

The exploratory studies described here were made to determine whether or not water or air jets could meet the requirements.  The investigation was carried out during the fall and winter of 1963-64 in a test flume designed specifically for this purpose and located at the Carson Hatchery Fish Cultural Station, Carson, Washington.