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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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Presentation on theme: "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."— Presentation transcript:

1 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

2 Plight of the lamprey

3 Problems

4 Adult lamprey passage

5

6

7 Effectiveness of common fish screen materials to protect lamprey ammocoetes

8 Nearly 80% of water diversions in the Pacific Northwest are unscreened and can pose a major risk to fish* *FRIMA report

9 What about the other 20%? Criteria for screen design, operation, and protection of fish largely from studies of salmonids

10

11 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 Objective

12 Screen types Profile bar (1.75 mm) Interlock (1.7 mm) Perf. plate (2.4 mm)12 & 14 g woven wire

13 Methods 5 size classes (mean TL= 40, 50, 60, 100, 130 mm) 2 releases per size class 6–13 fish per release 1 h test at 12 cm/s AV Sizes of fish entrained Timing of entrainment Injury and mortality Evaluated

14 No. of fish entrained

15 Probability of entrainment

16 % of fish entrained

17 Fish injury Severe injuries rare Minor abrasions to the skin and caudal fin –2–13% for all fish –0–9% for those above the screen –5% for control fish Injuries more common in smaller fish Higher for screens that were most protective

18 Summary Screens offered varying levels of protection Fish < 46 mm entrained by all screens Impingement common for all sizes of fish PP and IL performed the best Wire cloth screens performed the worst  Use PP or IL  Replace wire cloth screens

19 Current research Test SV and AV scenarios Test different screen types –Vertical, rotary drum, etc. –Cleaning structures Test criteria at field sites

20 Acknowledgments


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