Heavy metal distribution in different fish species from the Mauritania coast

Cadmium, copper, zinc and mercury concentrations were determined in pelagic and benthic fishes from the Mauritania coast. The pelagic fishes consisted of the round sardinella Sardinella aurita (Clupeidae), the chub mackerel Scomber japonicus (Scombridae) and the Atlantic horse mackerel Trachurus trachurus (Carangidae). Four benthic species were considered, three Serranidae: the painted comber Serranus scriba, the golden grouper Epinephelus costae, and the Niger hind Cephalopholis nigri and one Mullidae: the West African goatfish Pseudupeneus prayensis. Cadmium, copper, zinc and mercury concentrations are low in the edible muscles of the pelagic species. In the benthic fishes, metals could be determined also in the gills and liver. Cadmium and copper were present in relatively low levels in the muscle (less than or equal to 0.06 mu g Cd g(-1) dry wt., less than or equal to 1.6 mu g Cu g(-1) dry wt.) and gills (less than or equal to 0.23 mu g Cd g(-1), less than or equal to 3.1 mu g Cu g(-1)) and higher levels are encountered in the livers (less than or equal to 51 mu g Cd g(-1), less than or equal to 49.1 mu g Cu g(-1)). Zinc concentrations in the muscle are low (less than or equal to 20 mu g Zn g(-1) dry wt.), the concentrations in the gills (less than or equal to 120 mu g Zn g(-1)) approach those of the livers for C. nigri and P, prayensis or are higher in the case of S. scriba and E. costae. Mercury concentrations in the gills and muscle of the pelagic species are very low, higher quantities are found in the livers of the benthic species. The metal concentrations in all the fishes analysed, which are restricted to approximately 40 specimens, are low except those found for cadmium in the livers of the benthic fishes. (C) 1999 Elsevier Science B.V. All rights reserved.