Brian Roth Salmon
Brian Roth shows off a Chinook salmon, a popular sport fish and top predator in the Great Lakes.

In Episode 13 of Illinois-Indiana Sea Grant’s podcast series Teach Me About the Great Lakes, titled “It Smells Like Science,” host Stuart Carlton interviews Brian Roth, an ecologist in the Department of Fisheries and Wildlife at Michigan State University. Roth studies food web structure and function to try to understand how fish management and harvest actions affects the food web and vice versa.

headshot of man wearing red polo, surrounded by trees

Brian Roth

Carlton, IISG assistant director, and Roth talk about predatory fish in the Great Lakes, the history of the Great Lakes salmon fishery, how native and invasive fishes interact within the ecosystem, and how the fish populations are changing as lake conditions change, as well. They also briefly discuss invasive crayfish and the nitty gritty detail of conducting a fish diet study.

Teach Me About the Great Lakes is a monthly podcast in which Carlton—a social scientist who grew up in the South near the Gulf of Mexico—asks people to explain the biology, ecology and natural history of the Great Lakes. A new episode is usually released on the first Monday of each month. The latest episode is embedded below.

Love this episode and want to hear more in the future? Subscribe on Apple Podcasts or Spotify, or use the RSS feed in your favorite podcast player.

If you have questions you want answered about the Great Lakes, reach out to Stuart Carlton at jsc@purdue.edu.


Illinois-Indiana Sea Grant is a part of University of Illinois Extension and Purdue Extension.

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Did you know unused medications can end up in our lakes, rivers, and drinking water, affecting our wildlife and water quality? That’s why proper disposal matters. This Saturday, April 25th, take advantage of the DEA’s National Prescription Drug Take Back Day (10 a.m. – 2 p.m.) to safely and anonymously drop off expired or unused prescriptions.Can’t make it Saturday? Our Unwanted Meds program can help you find a year-round drop-off location near you: unwantedmeds.org/how-to-dispose/find-a-drop-off-locationClick the link in our bio to access the Unwanted Meds drop-off locator!#UnwantedMeds #TakeBackDay #GreatLakes #WaterQuality #SafeDisposal
Happy Earth Day 🌎💙From the Great Lakes to your local community, every action counts. Whether it’s reducing waste, protecting water, or learning something new, small steps make a big impact.