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cisco (Coregonus artedi) [state endangered]
Photo © Paul Vecsei/Engbretson Underwater Photography

 Features and Behaviors

The upper lip of the cisco reaches to behind the front edge of its eye. This fish has a long, slender body with an adipose fin. The pelvic fins are located about even with the dorsal fin. The back is blue-green. The sides are silver. A cisco adult averages about nine to 12 inches in length and about one pound in weight.
This species travels in schools. Spawning occurs in fall and winter. It is a fish of shallow water that eats tiny crustaceans, plankton, insects and some small fishes. It is not tolerant of warm temperatures.

 Illinois Range