U.S. Department of the Interior U.S. Geological Survey Impact of irrigation diversion screens on juvenile lamprey in the Columbia River basin Matthew G. Mesa U. S. Geological Survey Western Fisheries Research Center Columbia River Research Laboratory
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U.S. Department of the Interior U.S. Geological Survey Impact of irrigation diversion screens on juvenile lamprey in the Columbia River basin Matthew G.
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U.S. Department of the InteriorU.S. Geological Survey
Impact of irrigation diversion screens on juvenile lamprey in the Columbia River basin
Matthew G. Mesa
U. S. Geological Survey
Western Fisheries Research Center
Columbia River Research Laboratory
Plight of the lamprey
Problems
Adult lamprey passage 1997-2010
0
100000
200000
300000
400000
500000
Dam
Cu
mu
lati
ve c
ou
nt
Effectiveness of common fish screen materials to protect lamprey ammocoetes
Nearly 80% of water diversions in the Pacific Northwest are unscreened and can pose a major risk to fish*
*FRIMA 2002-04 report
What about the other 20%?
Criteria for screen design, operation, and protection of fish largely from studies of salmonids
Goal
Develop criteria for design and operation of fish screens that minimize injury and
mortality to lamprey
Test performance of 5 screen materials for protecting larval lamprey