Toxicity of aldicarb and fonofos to the early-life-stage of the fathead minnow |
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Authors: | Quentin H Pickering Wallace T Gilliam |
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Institution: | (1) Environmental Research Laboratory-Duluth, Newtown Fish Toxicology Station, U.S. Environmental Protection Agency, 45244 Cincinnati, Ohio |
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Abstract: | Flow-through early-life-stage (ELS) toxicity tests were conducted with the pesticides aldicarb (Temik®) and fonofos (Dyfonate®) to determine their effect on the survival and growth of fathead minnows. Concentrations of 78 g/L of aldicarb and 16 g/L of fonofos did not affect survival and growth. However, 156 g/L of aldicarb and 33 g/L of fonofos were lethal to larval-juvenile exposed for 30 days post-hatch. The maximum acceptable toxicant concentration (MATC) of aldicarb and fonofos for the fathead minnow is estimated to be between 78–156 g/L and 16–33 g/L, respectively. The corresponding chronic values (geometric mean of MATC values) would be 110 g/L and 23 g/L. Acute toxicity tests gave 96-hr LC50 values of 1370 g aldicarb/L and 1090 g fonofos/L. The acute-chronic ratio (96-hr LC50/chronic value) is 12 for aldicarb and 47 for fonofos. |
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