Susceptibility and Resistance of Mosquito Fish to Several Insecticides1

Abstract
Approximate LD50values for DDD, endrin, aldrin, dieldrin, toxaphene, heptachlor, and lindane were determined for 4 populations of mosquito fish, Gambusia affinis affinis (Baird and Girard). The results show resistance and crossresisance in populations having past exposure to insecticides. Evidence favoring a genetic basis for resistance is presented wherein toxicity levels remained constant in progeny of resistant fish which were reared in the absence of inseticides.

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