Abstract
Methyl parathion was applied to Clear Lake at a rate of 3.3 ppb for control of Chaoborus astictopus Dyar & Shannon. Three treatments at 20-day intervals had no lasting impact on zooplankton. Recovery to near or above pretreatment numbers was rapid for the organisms examined, including copepod nauplii, Diaptomus franciscanus Lilljeborg, Cyclops sp., Mesocyclops spp., Daphnia spp., Bosmina longirostris (O. F. Muller), Diaphanosoma brachyurum (Lieven) and Ceriodaphnia reticulata (Jurine). No residues were detected in lake sediments. Highest residues in water were found 8 and 24 h after the treatments, varying from 0.5–5.4 ppb, and generally declining after each treatment. However, generally larger residues were found with each successive treatment. Residues in bluegill sunfish, Lepomis macrochirus Rafinesque, exposed to the treatments in live cars, varied from 11–110 ppb. A significant correlation was found between the methyl parathion levels in fish and water collected simultaneously.
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