The toxicity of malathion and its hydrolysis products to the Eastern Mudminnow,Umbra pygmaea (DeKay)
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The toxicity of malathion and its major hydrolysis products to the eastern mudminnow,Umbra pygmaea, was determined by utilizing 4-day static toxicity tests and 14-day continuous flow tests. Four-day LC50 values in mg/l were as follows: malathion 0.24; dimethylphosphorodithioic acid 17; diethyl fumarate 8.5; 2-mercaptodiethylsuccinate 47 and dimethylphosphorothionic acid 26. The basic hydrolysis products proved to be more toxic than the acid hydrolysis products and 14-day continuous flow tests were conducted only on malathion and the basic hydrolysis products. Calculations of field application rates for the pesticide reviewed in light of the toxicity results suggest that only the parent compound, malathion, poses an environmental hazard to the mudminnow.
KeywordsHydrolysis Product Malathion Fathead Minnow Gloucester Point LC50 Concentration
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- American Public Health Association. 1960. Standard Methods for the Examination of Water and Waste Water. Eleventh Ed., American Public Health Association, New York, N.Y. 626 p.Google Scholar
- Bender, M. E. 1968. The effect of malathion on fishes. Ph.D. Thesis, Rutgers University. 97 p.Google Scholar
- Burdick, G. E. 1967. Use of bioassays in determining levels of toxic wastes harmful to aquatic organisms. Am. Fish. Soc. Special Publication No. 4:7–12.Google Scholar
- Hoff, J. G., andJ. R. Westman. 1965. Experiments with a dibrom-malathion formulation as a selective piscicide.New York Fish and Game J. 12:99–107.Google Scholar
- Litchfield, J. T., andF. Wilcoxon. 1949. A simplified method of evaluating dose effect experiments.J. Pharmacol. Exper. Therap. 96(1):99.Google Scholar
- Muhlmann, V. R., andG. Schroder. 1957. Hydrolyse der insekliziden phosphorsaureester.Z. Naturforscg. 12:196–208.Google Scholar
- Tarzwell, C. M. 1958. The toxicity of some organic insecticides to fishes. Proc. of the Twelfth Annual Conference, Southeastern Association of Game and Fish Commissioners: 233–239.Google Scholar
- Tarzwell, C. M. 1963. Harards of pesticides to fishes and the aquatic environment. From: Pesticides—their use and effect. Proc. Symp. N. Y. Legis. Commit. on Nat. Resources.Google Scholar
- Weiss, C. M., and J. H. Gakstatter. 1965. The decay of anticholinesterase activity of organic phosphorus insecticides on storage in waters of different pH. The Proceedings of the Second International Water Pollution Research Conference. Tokyo 1964:83–99.Google Scholar