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Welcome to the interactive web schedule for the 2019 Midwest Fish & Wildlife Conference! The schedule is subject to change (as of November 7, 2018). Please check back for updates. To return to the main Conference website, go to: www.midwestfw.org.

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Monday, January 28 • 2:00pm - 2:20pm
(SYMPOSIA-04) Food Web Interactions Among Walleyes, Lake Whitefish, and Yellow Perch in Green Bay

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AUTHORS: Daniel Isermann, Lucas Koenig, Daniel Dembkowski – Wisconsin Cooperative Fishery Research Unit; Iyob Tsehaye, Wisconsin Department of Natural Resources; Wesley Larson, USGS-Wisconsin Cooperative Fishery Research Unit; Scott Hansen, Steve Hogler; Tammie Paoli – Wisconsin Department of Natural Resources; Troy Zorn, Michigan Department of Natural Resources

ABSTRACT: Green Bay supports important fisheries for walleyes, lake whitefish, and yellow perch and these species likely interact in a variety of ways. A better understanding of these interactions is needed to guide management decisions. Specifically, there are concerns that high walleye abundance could negatively influence abundance of yellow perch and lake whitefish, primarily through predation. However, the prevalence of round gobies within the ecosystem may provide a predation buffer for yellow perch and lake whitefish. Moreover, the lake whitefish population in and around Green Bay is comprised of multiple genetic stocks. Consequently, if walleye predation on lake whitefish varies across time and space, this predation could affect certain whitefish stocks to a greater degree than others. To help address some of these uncertainties, our research objectives are to determine if: 1) lake whitefish and yellow perch represent important prey for walleyes in Green Bay; 2) diets of these three species vary spatially and temporally and if diet overlap among species is evident; 3) the extent of walleye predation is sufficiently high to influence recruitment potential of lake whitefish and yellow perch and 4) extent of walleye predation varies among individual stocks of lake whitefish. We are integrating an intensive assessment of diet composition for all three species with bioenergetic modeling and genetic stock identification to address our objectives. We will discuss the innovative experimental framework we are using to address these objectives and provide preliminary results of our diet analyses.

Monday January 28, 2019 2:00pm - 2:20pm