Abstract
Juvenile Louisiana red crawfish, Procambarus clarkii (Girard), weighing 0.1–2.5 g, were exposed to dilutions of aldrin, methyl mercury dicyandiamide, and methyl parathion in laboratory tests to determine their response to these pesticides. The 5-day median tolerance limit (TLm) for aldrin, methyl mercury dicyandiamide, and methyl parathion was 38 ppb, 83 ppb, and <10 ppt respectively. Adult crawfish were found to have a 5-day TLm of 600 ppb for aldrin. Adult crawfish tested in field cages were not measurably affected by aldrin seed treatments at the rates of 0.25 and 0.5 pound toxicant/cwt of rice seed alone or in combination with 1.2 ounces of a 2.2% solution of methyl mercury dicyandiamide/cwt seed.
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