Toxicity of Selected Chemicals to the Fairy Shrimp, Streptocephalus seali, under Laboratory and Field Conditions

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Abstract
Laboratory toxicity tests were conducted with six chemicals to determine their effect on fairy shrimp (Streptocephalus seali). Formalin (15 and 25 mg/1) and Diquat (0.25 to 2.0 mg/1) were not toxic to fairy shrimp. Paraquat (0.25 to 2.0 mg/1) and benzene hexachloride (0.10 and 0.25 mg/1) were moderately toxic. Dylox (0.10 and 0.25 mg/1) was highly toxic; mortality exceeded 82% at 48 h. Potassium permanganate (0.5 to 4.0 mg/1) produced 100% mortality in less than 24 h. Pond treatments with potassium permanganate (1.0 and 2.0 mg/1) produced more rapid mortality than did Dylox (0.25 mg/1). Neither chemical completely eliminated all fairy shrimp from ponds, except in isolated cases.

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