Assessment of freeze-brand and PIT-tag recovery data for juvenile salmonids at McNary Dam. Annual report 1988

摘要

This study evaluated mark recovery data from PIT-tagged and freeze-branded rover-run yearling and subyearling chinook salmon, sockeye salmon, and steelhead at McNary Dam in 1988. Double-marked (PIT- tagged and freeze-branded) juvenile salmonids were released within the McNary Dam collection system upstream from the PIT-tag detectors and brand sampling system. Results indicate that brands were recovered in smaller proportions than PIT tags and the variability of brand data was considerable. Most of the error associated with brands was attributable to human error inherent in brand detection and interpretation. 9 refs., 3 figs., 12 tabs. (ERA citation 15:034238)