Mortality of Palmetto Bass Following Catch-and-Release Angling

Abstract

Palmetto bass (Striped Bass Morone saxatilis × White Bass M. chrysops) have been stocked into reservoirs in the southeastern USA since the late 1960s and have gained widespread acceptance as a sport fish. These fisheries are growing in popularity and catch-and-release (CR) fishing is commonplace; however, there is a dearth of information on CR mortality of palmetto bass. We experimentally angled palmetto bass (n = 56; >373-mm TL) in a Tennessee reservoir using traditional angling gear in water temperatures ranging from 13°C to 32°C. Ultrasonic transmitters equipped with floats were externally attached to fish, which were released immediately and tracked multiple times within 10 d of release. Mortality was negligible (3.6%) in fall and spring at cool water temperatures but was high (39.3%) in summer when water temperatures exceeded 26°C. The best logistic regression model based on Akaike's information criterion for small sample sizes scores relied on water temperature alone to predict CR mortality of palmetto bass; there was little support for other models that included all possible combinations of the six other predictor variables we tested. Palmetto bass in our study experienced lower CR mortality than Striped Bass in other systems, but CR mortality rates for palmetto bass that approach or exceed 40% during summer are still problematic if the goal is to maintain fishing quality.

Received February 20, 2013; accepted June 2, 2013

ACKNOWLEDGMENTS

Funding and other support for this research was provided by the Center for the Management, Utilization, and Protection of Water Resources at Tennessee Technological University; TWRA; and the U.S. Geological Survey (USGS) Tennessee Cooperative Fishery Research Unit. The Tennessee Cooperative Fishery Research Unit is jointly sponsored by the USGS, the U.S. Fish and Wildlife Service, the Tennessee Wildlife Resources Agency, and Tennessee Technological University. This manuscript benefitted from comments provided on an earlier draft by Thomas Roberts and David Smith. We thank Mike Smith, John Hammonds, and members of the J. Percy Priest Hybrid and Striper Club for their assistance and support in capturing and holding palmetto bass. Reference to trade names does not imply endorsement by the U.S. Government.