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Family Osmeridae - Smelt Family [nonnative]

Smelts are small, slender fishes with a large mouth, cycloid scales, a lateral line, an adipose fin and no spines in the fins. They eat crustaceans. The rainbow smelt became established in Lake Michigan in the 1930s.
 
WAFRainbowSmelt.jpg
rainbow smelt (Osmerus mordax) [nonnative]
Photo © Sean Landsman/Engbretson Underwater Photography

 Features and Behaviors

​FEATURES
The rainbow smelt has a very large mouth with jaws that reach to the back edge of each eye. Big teeth are present on the tongue and the roof of the mouth. The body is long and slender, and an adipose fin is present. The back is dark green. The sides are silver to blue. The front edge of the pelvic fins is in line with or slightly behind the front edge of the dorsal fin. Mature rainbow smelt are seven to 10 inches long.
 
BEHAVIORS
Rainbow smelt live in water 15 to 200 feet deep and often within a mile of shore. They migrate in groups into tributary streams to spawn in late winter and spring when the correct water temperature occurs. This species eats crustaceans, insect larvae and small fishes.

 Illinois Range