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Scientific Report

Observations on the Accuracy of Redd Counting Techniques Used in the Columbia Basin

Abstract

Spawning ground surveys are one of the primary methods used to estimate the abundance of naturally spawning anadromous fish populations.  Fisheries managers have also relied on these surveys to make indirect assessments of historic salmonid productivity, production potential, the quality and quantity of habitat, and as predictors of future run sizes and acceptable harvest levels.  Redd counts may be calibrated to convert index counts (counts from assigned indicator areas) into estimates of absolute escapement in tributaries and, through aggregation, in subbasins.

Authors

Citation

Schwartzberg, M. and P. Roger. 1986. Observations on the Accuracy of Redd Counting Techniques Used in the Columbia Basin. Columbia River Inter-Tribal Fish Commission Technical Report 86-2. Portland, Oregon.

Date

Jun 1st, 1986

Report No.

86-2

Media Type

CRITFC Technical Report

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