Chromium and mercury concentrations in water, sediment and fish tissue were studied to assess the health risks concerned when such fish are consumed.
Metal concentrations were studied in the liver, kidney and muscle tissues of the African sharptooth catfish, Clarias gariepinus, kept in treated sewage effluent from a biofilter treatment plant and in the Krugersdrift Dam, Bloemfontein, South Africa as well as in the water and sediment of the mentioned localities.
Chromium concentrations were noticeably higher in the livers and kidneys than in the muscle tissue.
In contrast, Hg concentrations were higher in the muscle tissue than in the livers and kidneys.
However, no set seasonal patterns could he established regarding the incidence of these elements in both habitats.
The occurrence of Hg in the water of both habitats was very low and could therefore not be considered harmful or toxic to aquaculture.
Chromium concentrations showed a fluctuating occurrence and exceeded international limit values during some months.
The Hg and Cr concentrations found in the muscles of C. gariepinus, kept in treated domestic effluent can be a health hazard to consumers if fish is consumed in excess.
Only gutted fish with the gills removed would be recommended for intake due to the Hg and Cr concentrations found in the kidney and liver tissue.
Mots-clés Pascal : Eau usée, Pollution eau, Milieu eau douce, Aquiculture, Clarias gariepinus, Pisces, Vertebrata, Animal élevage, Poisson comestible, Contamination, Aliment, Métal lourd, Chrome, Mercure, Homme, Toxicité, Santé publique, République Sud Africaine, Afrique
Mots-clés Pascal anglais : Waste water, Water pollution, Freshwater environment, Aquaculture, Clarias gariepinus, Pisces, Vertebrata, Farming animal, Edible fish, Contamination, Food, Heavy metal, Chromium, Mercury, Human, Toxicity, South Africa, Africa
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0152649
Code Inist : 002B03H. Création : 199608.