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Acute toxicity of two insecticides malathion and deltamethrin was studied in adult of the estuarine crab Chasmagnathus granulata. Static tests were performed and the concentration that killed 50% of test organisms (LC50) were estimated. Only adult male crabs (mean carapace width: 20.9 ± 0.73 mm and 33.0 ± 2.94 mm) were used. The toxicity of compounds varied substancially. No significant differences (P> 0.05) were found comparing both carapace. The estimated LC50 values to malathion were 13 ug/l (11.3-19.0) and 19 ug/l (15.0-26.0) respectivily. The estimated LC50 values to deltamethrin were 0.27 ug/l (0.25-0.45) for both measure of carapace used. Chasmaganthus granulata was more tolerant to malathion than deltamethrin.

investigaciones marinas

Evaluación en laboratorio de la toxicidad aguda de los insecticidas malatión y deltametrina en Chasmagnathus granulata Dana (Crustacea, Brachyura, Grapsidae)