Résidus de pesticides organochlorés chez les bivalves et les poissons de la lagune de Moulay Bousselham (Maroc)

Abstract

Oragnochlorine pesticide residues in bivalves and fishes from
the Moulay Bousselham lagoon (Morocco) This work involves an assessment of the degree of contamination by Organochlorine pesticides (POC) of clams (Venerupis deccusatua), mussels (Mytilus edulis) and fish mullet (Mugil cephalus) from the Moulay Bousselham lagoon. 12 organochlorine pesticides are considered in this study: DDT and its metabolites (DDD, DDE), ƒÁHCH and ƒ¿HCH, aldrin, endrin, dieldrin, heptachlor, heptachlor epoxide, hexachlorobenzene (HCB) and ƒ¿ endosulfan. The study showed an important contamination by organochlorine pesticides, DDT and its metabolites present the high concentrations at all species, lindane and its isomers are also present but at low concentrations. At clams, concentrations of POC varied between 9.2 to 51.72 ng/g (dry weight) with a maximum detected in the station of oued Drader. Mussels were less contaminated that clams, concentrations varied between 4.53 to 16.81 ng/g. The contamination of mullet by POC is more marked with a concentrations varied between 12.52 ng/g recorded in November to 82.39 ng/g detected in May. The strong proportion of DDE in relation to DDT showed that the major of
contamination is very old. The quantities of organochlorine pesticides revealed at clams, mussels and mulled of Moulay Bousselham lagoon don’t exceed the maximal limits in marines organisms. The consumption of these species don’t have actually any problem in public health.