noun, plural (especially collectively) mosquitofish (especially referring to two or more kinds or species) mosquitofishes.
any of several fishes that feed on mosquito larvae, as Gambusia affinis, found in the southeastern U.S., now introduced into other parts of the world for mosquito control.
Also, mosquito fish.

1925–30; mosquito + fish Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To mosquitofish

silvery topminnow with rows of black spots of tropical North America and West Indies; important in mosquito control 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Mosquitofish can be used in permanent water sources such as ponds, fountains, bird baths and ditches to control mosquito breeding.
Mosquitofish may be stocked by technicians without special permits.
Today, these have been largely replaced by introduced species such as the common carp, yellow bullhead and mosquitofish.
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