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Tuesday, January 30 • 6:00pm - 9:00pm
Poster Display. Preliminary Assessment of Walleye, Lake Whitefish, and Yellow Perch Diets in Green Bay

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AUTHORS: Alex Catalano, Fisheries Analysis Center; Daniel Isermann, Wisconsin Cooperative Fisheries Research Unit; Iyob Tsehaye, Scott Hansen, Tammie Paoli, Steve Hogler - Wisconsin Department of Natural Resources

ABSTRACT: Lake whitefish, walleyes, and yellow perch support some of the most important fisheries in Green Bay, but managers have limited information on how these three species interact in terms of predation and diet overlap. In 2016, we initiated a collaborative effort to gain more information on diets and potential interactions among these three species. To this point, we have examined diets from 298 walleye, 205 lake whitefish, and 189 yellow perch collected in Wisconsin DNR gill nets placed in 3 locations during the spring and from a few Wisconsin DNR electrofishing runs conducted in the fall. In 2016 samples, round gobies represented the most important common prey item observed in walleye and yellow perch diets, while benthic invertebrates dominated lake whitefish diets. Initial assessment of 2017 samples suggests that round gobies are less prevalent in walleye diets and gizzard shad are more prevalent. Additional prey items in walleye have included rainbow smelt, yellow perch, and lake whitefish. Yellow perch also prey on benthic invertebrates and round gobies have been observed in lake whitefish diets. Our initial analyses have been limited in time and space and additional sampling is needed to understand food web interactions among these three species. 

Tuesday January 30, 2018 6:00pm - 9:00pm CST
Ballroom C & Foyer

Attendees (6)