Monster-Sized FishLake sturgeon grow very slowly. However, with such a long lifespan, they can grow to a prodigious size, as seen in Maka's record-setting 193-pound catch. Lake sturgeon are the largest fish in Michigan, and it's not even close.
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You won't find much in the way that will leave you wanting to stay out of the waters here in the Great Lakes. The description of the biggest predator in the Great Lakes may drive you to at least do it during the day if anything... Michigan's biggest predator in the Great Lakes is a Sea Lamprey.
Alligators are rarely found in the Great Lakes. Although some alligators thrive in freshwater, it's just too cold in the north for them to survive. They don't typically live farther north than North Carolina. It's unclear how the alligator arrived to Lake Michigan.