INFLUENCE OF LIPID STATUS ON TISSUE DISTRIBUTION OF THE PERSISTENT ORGANIC POLLUTANT OCTACHLOROSTYRENE IN ARCTIC CHARR (SALVELINUS ALPINUS)

摘要

The tissue distribution of the lipophilic persistent pollutant octachlorostyrene (OCS) in relation to the amount, composition and localization of body lipids was investigated in two groups of Arctic charr, which before OCS administration had been held on a restricted feed ration (lean charr) or fed to satiation (fat charr). Lean charr were only a little over a third of the size of the fat charr, with most tissues and organs having a substantially lower concentration of triacylglycerols but only a slightly lower concentration of phospholipids and cholesterol than those of fat charr. No differences were found between the two groups, regarding the size or lipid content and composition of the brain. The tissue concentration of OCS was positively correlated with the concentration of triacylglycerols and negatively correlated with phospholipids and cholesterol. The proportion of the total body burden of OCS deposited in extra-adipose tissues was higher in the lean charr (28%) than in fat charr (13%). The mean OCS concentration in the brain of the lean charr was almost four times higher than in fat charr. The results indicate an increased risk of xenobiotic-associated stress when storage lipids are depleted, for example, during the period in which anadromous salmonid fish undergo the morphological, physiological and behavioral pre-adaptations necessary for a successful seaward migration. (C) 1997 Elsevier Science Inc. [References: 34]