Dynamics influencing a declining walleye
population in Mille Lacs Lake
Department of Biology Seminar
Tyler Ahrenstorff, PhD
Fisheries Research Biologist,
Minnesota Department of Natural Resources
Friday, January 15
Lsci 185 at 3:15p.m.
Host: Tom Hrabik
Coffee and cookies
served in the SSB
Atrium at 2:30 p.m.
The Mille Lacs Lake ecosystem is undergoing significant change, including a declining walleye population. This declining walleye population
appears to be at least partly driven by reduced survival of juvenile walleye over their first few years of life. We will explore some of the mechanisms
that may be reducing juvenile walleye survival, with particular focus on the role of predation using diet information from nearly 10,000 predators
and bioenergetics modeling. The bioenergetics modeling approach allows for estimates of how much food, and how many juvenile walleye, have
been consumed over recent years by each predator species (i.e. walleye, northern pike, and smallmouth bass). As ecosystem change continues,
improved understanding of ecosystem dynamics will lead to better management and a more sustainable fishery.
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