Estimating Genetic Diversity Levels and Sampling Effort Required for Wisconsin's Walleye Propagation Program

Conservation of genetic resources is a vital component of Walleye Sander vitreus management in Wisconsin. Maintaining genetic diversity is especially important within the propagation program. Our objectives were to (1) compare the genetic diversity within Wisconsin’s feral Walleye broodstock with genetic diversity levels in other naturally recruiting, Wisconsin Walleye populations; and (2) determine if varying levels of sampling effort influence measured genetic diversity levels. Genetic diversity within the broodfish was comparable to other northern Wisconsin populations. Some broodstock populations were not genetically representative of the regional genetic stock, suggesting alternative broodstock populations should be used. Results also suggest that increased temporal sampling should be conducted to obtain larger numbers of broodfish and increase genetic diversity within progeny. Results from this research will be used to develop a genetic broodstock management plan which includes standardized broodstock collection techniques, spawning and rearing techniques, and fish distribution protocols. This will ensure the Wisconsin Department of Natural Resources is operating using the best possible management practices.