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.

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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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What does it mean to be Great Lakes literate?It’s understanding how the Great Lakes shape your life and how your choices impact the lakes. To be Great Lakes literate is to understand, communicate, and care for these special freshwater resources. 💙Learn more about Great Lakes Literacy by visiting the Center for Great Lakes Literacy’s website at the link in bio.#TeachingTuesday
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Got a research idea for southern Lake Michigan? IISG’s 2026 Seed Grant Research Competition is open. Up to $150,000 total funding for pilot studies that could become your next big project.💵 $10,000 to $50,000 per project⏰ Applications due August 17, 2026Two info webinars coming up: July 2 and July 21.🔗 Full details at the link in bio.
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