Great Lakes Ecosystem Information and links So the inside scoop is Alewife, the exotic prey fish in Lake Michigan, is on the brink of being reduced to zero. This means bad news for Chinook Salmon who feed almost exclusively on them. In contrast the native species such as lake trout, walleye, smallmouth bass and yellow perch should see dramatic increases. Round gobies, another recent invader to the Great Lakes, has taken over as the primary forage fish but it is closely associated with the bottom.
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