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blacktail shiner
The blacktail shiner (''Cyprinella venusta'') is a small freshwater fish in the Cyprinidae family native to the United States.
==Description and anatomy==
The blacktail shiner is a somewhat slender minnow with 8-9 rays on the anal fin, and a prominent black spot at the base of the caudal fin (tail fin).〔http://www.fishbase.org/summary/Cyprinella-cercostigma.html〕 The back is usually yellowish-olive, and the sides are silvery with hints of blue. Adults usually reach in length. The blacktail shiner has a large, black caudal spot which distinguishes it from most other minnows. The caudal spot of the blacktail shiner may be faint, especially in populations inhabiting turbid waters, and they could likely be confused with the red shiner (''C. lutrensis''); however, the red shiner has 9 anal rays (versus 8) and usually 35 or fewer lateral scales (versus 36 or more).
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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