Physiological and biochemical changes in shrimp larvae (Penaeus vannamei) intoxicated with organochlorine pesticides |
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Authors: | R.José G. Galindo,J.Alejandra Medina,L.Cecilio Villagrana |
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Affiliation: | Escuela de Ciencias del Mar, Universidad Autónoma de Sinaloa, Paseo Claussen s/n Mazatlán 82000, Sinaloa, México |
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Abstract: | Shrimp larvae (Penaeus vannamei) collected from an uncontaminated area were challenged with sublethal concentrations of organochlorine pesticides. The effects of treatment with lindane, lorsban, chlordane and DDT, were a 5, −12, 13 and 21% increase in the larval respiratory rate, respectively. Glycogen synthesis decreased from the 0.471 μg g−1 h−1 of the control, to 0.455, 0.415, 0.400 and 0.365 μg g−1 h−1, for larvae submitted to DDT, chlordane, lindane and lorsban. In addition, we measured decreases in nucleic acid content, from 20.4 and 34.9% in larvae challenged by chlordane and lorsban, respectively, and values close to 25% for two other pesticides tested. These results indicate drastic metabolic changes, which may impinge on the commercial fishery and culture of this organisms. |
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