This study determined the toxicity of parathion and methyl parathion to organochlorine compound-resistant and -susceptible populations of mosquitofish (Gambusia affinis). Mosquitofish can tolerate about 40 times more methyl parathion than parathion. The resistant population demonstrates a 1.3 fold greater tolerance of methyl parathion than the susceptible population, which may be a developing resistance. The resistant population also demonstrates an environmentally-induced tolerance to parathion (1.6 fold) in the spring but no overall tolerance to parathion in the fall when compared to the susceptible population.
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CHAMBERS, J. E.: Studies of organophosphorus insecticide toxicity and possible mechanisms of tolerance in insecticide-susceptible and -resistant populations of mosquitofish (Gambusia affinis). Ph.D. Thesis. Mississippi State University, Mississippi State. 40 p.
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This study was supported by NIH grant 5 ROI 00412 and NSF Graduate Traineeship grants GZ-1629-1970-71 and Gz-2036-1971-72.
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Chambers, J.E., Yarbrough, J.D. Parathion and methyl parathion toxicity to insecticideresistant and susceptible mosquitofish(Gambusia affinis) . Bull. Environ. Contam. Toxicol. 11, 315–320 (1974). https://doi.org/10.1007/BF01684935
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