Observations on the Accuracy of Redd Counting Techniques Used in the Columbia Basin
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.
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. 19p.