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Wild About Illinois Fishes!
Family Atherinidae - Silverside Family
Family: Atherinopsidae - Silversides are often found near the surface of the water. They may be seen jumping out of the water when spawning or threatened. Characteristics include an upturned mouth, flattened head, scales on the head, large eyes, no lateral line, a long snout and two widely separated dorsal fins.
brook silverside (Labidesthes sicculus)
inland silverside (Menidia beryllina) [nonative]