||Toxicity of Aldicarb and Fonofos to the Early-Life-Stage of the Fathead Minnow.
Pickering, Q. H. ;
Gilliam, W. T. ;
||Environmental Research Lab.-Duluth, Cincinnati, OH. Newtown Fish Toxicology Station.
Lethal dosage ;
Fathead minnows ;
Biological effects ;
Water pollution effects(Animals)
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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 micrograms/L of aldicarb and 16 micrograms/L of fonofos did not affect survival and growth. However, 156 micrograms/L of aldicarb and 33 micrograms/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 micrograms/L and 16-33 micrograms/L, respectively. The corresponding chronic values (geometric means of MATC values) would be 110 micrograms/L and 23 micrograms/L. Acute toxicity tests gave 96-hr LC50 values of 1370 micrograms aldicarb/L and 1090 micrograms fonofos/L. The acute-chronic ratio (96-hr LC50/chronic value) is 12 for aldicarb and 47 for fonofos.