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Salmon escapement estimates into the Togiak River using sonar, Togiak National Wildlife Refuge, Alaska, 1987, 1988, and 1990

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Citation

David B. Irving, James E. Finn, and James P. Larson, 1995, Salmon escapement estimates into the Togiak River using sonar, Togiak National Wildlife Refuge, Alaska, 1987, 1988, and 1990: USFWS Alaska Fisheries Technical Report.

Summary

We began a three year study in 1987 to test the feasibility of using sonar in the Togiak River to estimate salmon escapements. Current methods rely on periodic aerial surveys and a counting tower at river kilometer 97. Escapement estimates are not available until 10 to 14 days after the salmon enter the river. Water depth and turbidity preclude relocating the tower to the lower river and affect the reliability of aerial surveys. To determine whether an alternative method could be developed to improve the timeliness and accuracy of current escapement monitoring, Bendix sonar units were operated during 1987, 1988, and 1990. Two sonar stations were set up opposite each other at river kilometer 30 and were operated 24 hours per day, seven [...]

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Type Scheme Key
local-index unknown 70185510
local-pk unknown 70185510
series unknown USFWS Alaska Fisheries Technical Report

Citation Extension

citationTypeReport
journalUSFWS Alaska Fisheries Technical Report
languageEnglish
parts
typePublication Place
valueKing Salmon, AK

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