Integrated survey on toxic effects of lindane on neotropical fish: Corydoras paleatus and Jenynsia multidentata

PESCE, S., CAZENAVE, J., MONFERRÁN, M., FREDE, S., WUNDERLIN, D.A.

ENVIRONMENTAL POLLUTION

Elsevier

Año: 2008 vol. 156 p. 775 - 786

0269-7491

We report the effect of lindane on fish experimentally exposed to lindane. Sublethal toxicity was assessed through (a) changes in histopathology; (b) the activity of GST in different organs; and (c) bioaccumulation in exposed fish. We present a survey on toxic effects of lindane at these three levels, proposing a sequence of dose-dependent effects. Physiological damage was reversible at lowest doses, but severe at the highest, including damage consistent with fibrosis in liver and karyolitic nucleus in brain of both studied species. Exposure of Jenynsia multidentata above 6 mg L1 caused activation a GST in liver and gills, followed by inhibition at 75 mg L1. Interestingly, the bioaccumulation rate was suddenly increased when GST was inhibited. Corydoras paleatus exposed to 6.0 mg L1 lindane did not present significant changes in GST activity; however, enzymatic inhibition was observed above 25 mg L1. The bioaccumulation rate in C. paleatus remained constant throughout the experiments. All in all, these results evidence that C. paleatus is more sensitive to lindane than J. multidentata.Jenynsia multidentata above 6 mg L1 caused activation a GST in liver and gills, followed by inhibition at 75 mg L1. Interestingly, the bioaccumulation rate was suddenly increased when GST was inhibited. Corydoras paleatus exposed to 6.0 mg L1 lindane did not present significant changes in GST activity; however, enzymatic inhibition was observed above 25 mg L1. The bioaccumulation rate in C. paleatus remained constant throughout the experiments. All in all, these results evidence that C. paleatus is more sensitive to lindane than J. multidentata.mg L1. Interestingly, the bioaccumulation rate was suddenly increased when GST was inhibited. Corydoras paleatus exposed to 6.0 mg L1 lindane did not present significant changes in GST activity; however, enzymatic inhibition was observed above 25 mg L1. The bioaccumulation rate in C. paleatus remained constant throughout the experiments. All in all, these results evidence that C. paleatus is more sensitive to lindane than J. multidentata.Corydoras paleatus exposed to 6.0 mg L1 lindane did not present significant changes in GST activity; however, enzymatic inhibition was observed above 25 mg L1. The bioaccumulation rate in C. paleatus remained constant throughout the experiments. All in all, these results evidence that C. paleatus is more sensitive to lindane than J. multidentata.mg L1. The bioaccumulation rate in C. paleatus remained constant throughout the experiments. All in all, these results evidence that C. paleatus is more sensitive to lindane than J. multidentata.C. paleatus remained constant throughout the experiments. All in all, these results evidence that C. paleatus is more sensitive to lindane than J. multidentata.C. paleatus is more sensitive to lindane than J. multidentata.