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river chub
The river chub (''Nocomis micropogon'') is a minnow in the family Cyprinidae. It is one of the most common fishes in North American streams.
==Appearance and anatomy==
The river chub is a robust minnow, dark olivaceous above to dusky yellow below, with orange-red fins, large scales, a large slightly subterminal mouth, and a small barbel (whisker-like organ) at the corners of the jaw. During the breeding season, sexually mature males develop pinkish-purple coloration, and swollen heads with tubercles between the eyes and snout tip (they are sometimes called hornyheads).〔Etnier, David A and Wayne C Starnes. ''The Fishes of Tennessee'', (Knoxville: University of Tennessee Press, 1993), pp. 196-199.〕 The river chub grows to a maximum of about , with males larger than females. Common length is about .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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