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Description: |
ii, 19 pages : illustrations ; 24 cm |
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Bibliography Note: |
Includes bibliographical references (page 12). |
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Contents Note: |
Contents: Electrical apparatus -- Facilities -- Experimental procedures -- Effects of pulse types on fish -- Applicability of findings -- Summary -- Literature cited -- Appendix. |
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Summary, Etc. Note: |
Abstract: One of our most important sources of protein food, the Pacific salmon, is endangered by the construction of numerous dams on the Columbia, and other rivers in the Pacific Northwest. Although these dams are equipped with fish ladders that pass adult salmon to their spawning grounds, the seaward-bound fingerlings are presented with hazards to safe passage. |
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Abstract: Biologists at the Seattle, Washington laboratory of the Fish and Wildlife Service have investigated methods of guiding fingerlings away from the dangerous areas at dams by means of electricity, including experiments on orientation of fish to various voltage, pulse frequencies, pulse durations, wave forms and current densities. |
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Additional Physical Forms: |
Online version: Raymond, Howard L. Effect of pulse frequency and duration in guiding salmon fingerlings by electricity. Washington : U.S.G.P.O., 1956 (OCoLC)795026163 |