Fish of the Mississippi River. Introduction. Lake sturgeon are the largest fish found in Minnesota, capable of reaching 6.6 feet in length and nearly 100 pounds. Found in Minnesota waterways year-round, this long-lived, slow-growing fish travels widely in loose aggregations. It uses sensitive barbels to locate insect larvae and other invertebrates, snails, leeches, small mussels, and small fish, which are suctioned off the river bottom by an extendable mouth.
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