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Michigan Environmental Education Curriculum
River and Stream Ecosystems

There are many exotic fish species that can be found in rivers and streams. Exotic species are sometimes introduced by humans and other times invade the Great Lakes on their own.

Brown Trout Chinook Salmon

Brown Trout (Salmo trutta)

The brown trout were introduced into the Great Lakes in the late 1800's and have been successful. Brown trout found in rivers are usually brown in color. Those found in lakes are a little more silver colored. Brown trout are a major predator of the sturgeon larvae. They may also feed on insects and other invertebrates.

Chinook Salmon (Oncorhynchus tschawytscha)

The chinook salmon, sometimes called a "king" salmon, were introduced into the Great Lakes in the 1960's. Salmon migrate up rivers and streams in the fall season to lay their eggs. They spawn over beds of large gravel. Chinook salmon are among the most prized sport fish in Michigan.

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