Northwest Fisheries Science Center

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Document Type: Chapter or Section
Center: NWFSC
Document ID: 6687
Type of Book: Technical
Section or Chapter Title: Guiding salmon fingerlings with horizontal louvers. Report No. 16
Book Title: Fish-Passage Research Program review of progress 1964, Volume III
Author: Charles M. Larsen
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 use of horizontal louvers at dams or other water-use projects for the purpose of guiding downstream migrants into safe bypasses may be more desirable in some instances than vertical louvers.  From an economic viewpoint, the location of a fingerling bypass at or near the surface of the water, or the physical conformation of an existing dam, may indicate the need for guiding fish upwards rather than from side to side horizontally) as is the case with vertical louvers. 

If use of the louver principle is to be extended to include a wider range of environmental conditions, we need to know more of how and why fish respond to a louver array.  The experiments reported here employed a horizontal-louver array with a bypass located at or near the surface.  The objectives of this study were to examine the effect of light and louver color on the guiding efficiency of a horizontal-louver array.


Notes: 9 pages