Integrated Survey on toxic effects of Lindane on Neotropical fish: Corydoras paleatus and Jenynsia multidentata.

PESCE S., CAZENAVE J., MONFERRAN M., FREDE S. AND WUNDERLIN D.

ENVIRONMENTAL POLLUTION

Elseiver

Año: 2008

0269-7491

Abstract. 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; 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 nucleous in brain of both studied species. Exposure of J. multidentata above 6 µg·L-1 caused activation a GST in liver and gills, followed by inhibition at 75 µg·L-1. Interestingly, the bioaccumulation rate was suddenly increased when GST was inhibited. C. paleatus exposed to 6.0 µg·L-1 lindane did not present significant changes in GST activity; however, enzymatic inhibition was observed above 25 µg·L-1. 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. Capsule: We observed an inverse correlation between GST activity and bioaccumulation in exposed fish, showing a severe increase of bioaccumulation and damages upon inhibition of GST. Keywords: Ecotoxicology, xenobiotics, water pollution, bioindicators, biomarkers