Effect of pulse frequency and duration in guiding salmon fingerlings by electricity /

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.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.Includes bibliographical references (p. 12).Appendix.Literature cited.Summary.Applicability of findings.Effects of pulse types on fish.Experimental procedures.Facilities.Electircal apparatus.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.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.Mode of access: Internet