John Wiley & Sons, Ltd.

Effects of food limitation on nine metals concentrations in liver and PAH metabolites in bile of juvenile turbot (Scophthalmus maximus) previously exposed to contaminated sediments

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A two‐step experimental design was employed in the present study on juvenile turbot (Scophthalmus maximus): 1) juveniles were exposed for 26 days to two contaminated sediments and a reference one and 2) they were transferred in clean seawater with clean sediment for 35 days providing them food once a day, twice and once a week. Fish exposed to contaminated sediments presented a significant increase of hepatic Cd, Cu and Pb concentrations compared to reference condition after the 26‐days exposure. Higher fluorescence signals of PAH metabolites were found in bile from turbot exposed to contaminated sediments for 26 days compared to reference. These signals returned to values similar to reference fish after depuration whatever the food quantity. The metal bioaccumulation in Cd, Cu and Pb was no longer observed after 35 days depuration with an once a day feeding but still found with restricted feeding conditions. Results on reference fish showed also significant higher concentrations of most metals analysed in fish fed twice and once a week compared to fish fed once a day. These results could be related to a decrease of fish hepatosomatic index with food limitation and so a dilution effect on metal concentrations. This study clearly demonstrates that changes in feeding status have significant effects on metal concentrations in fish and no observed effect on PAH metabolites. Environ Toxicol Chem © 2013 SETAC

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