Stone roller

stoneroller

[stohn-roh-ler]
noun
1.
an American minnow, Campostoma anomalum, named from its habit of moving stones as it feeds.
2.
any of several other minnows or suckers with similar habits, as Hypentelium nigricans.

Origin:
1795–1805; stone + roller

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World English Dictionary
stone roller
 
n
a small silvery freshwater cyprinid fish, Campostoma anomalum, of the eastern US, having a narrow black stripe on the dorsal and anal fins
 
[C19: so called because it pushes stones about in building its nest]

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