, Volume 14, Issue 5, pp 573-577

Insecticide resistance in mosquitofish of the Lower Rio Grande valley of Texas—An ecological hazard?

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Acute toxicity tests using mosquitofish showed that a population from the Lower Rio Grande Valley of Texas has developed resistance to toxaphene and DDE but not to pyrethroid insecticides. Tests with progeny from resistant parents showed that the F1 generation was also resistant. Resistant mosquitofish bioaccumulate large body residues of organochlorine pesticides that apparently cause no problems for mosquitofish. However, consumption of resistant fish may be hazardous to fish or avian predators and may be one factor contributing to an overall population decline of some species in southern Texas.