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Rainbow Smelt

Osmerus mordax (species)

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The rainbow smelt (Osmerus mordax) is a North American species of fish of the family Osmeridae. Rainbow smelt invaded the Great Lakes watershed through an intentional introduction of eggs in 1912, and from there has made its way to various other places. Walleye, trout, and other larger fish prey on these smelt. The rainbow smelt prefer juvenile ciscoes, zooplankton such as calanoid copepods (Leptodiaptomus ashlandi, L. minutus, L. sicilis), and other small organisms, but are aggressive and will eat almost any fish they find. They are anadromous spring spawners and prefer clean streams with light flow and light siltation. The rainbow smelt face several barriers. They are weak swimmers and cannot overcome most fish ladders. This prevents them from making it past the dams to the headwater…

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