Species of fish
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The shoal chub (Macrhybopsis hyostoma) is a freshwater ray-finned fish in the family Cyprinidae, the carps and minnows. It occurs in Mississippi River drainages from eastern Ohio to southern Minnesota and Nebraska south to Louisiana. Its preferred habitat is sand and gravel runs (shoals) of small to large rivers.
In their breeding condition, males develop horny nuptial tubercles on the pectoral fins, and both sexes produce a sandpaper-like texture which is present across the surface of the head and much of the body.
References.
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