Top minnow

topminnow

[top-min-oh]
noun, plural (especially collectively) topminnow (especially referring to two or more kinds or species) topminnows.
any of several small, surface-swimming fishes of the egg-laying family Cyprinodontidae and the live-bearing family Poeciliidae, some of which are used in mosquito control.

Origin:
1880–85, Americanism; top1 + minnow

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World English Dictionary
topminnow (ˈtɒpˌmɪnəʊ)
 
n , pl -now, -nows
any of various small American freshwater cyprinodont fishes that are either viviparous (genera Heterandria, Gambusia, etc) or egg-laying (genus Fundulus)
 
[from top1 + minnow; so called because they are small and swim near the surface of the water]

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