Health risks associated with the utilisation of waste water for fish production were studied by investigating the possible bioaccumulation of iron and manganese in the muscle tissue, kidney and liver of the African sharptooth catfish, Clarias gariepinus, kept in treated sewage effluent and in the Krugersdrift Dam, Bloemfontein, South Africa.
Metal concentrations were also determined in the water and sediment of the mentioned localities.
The water of natural water sources, such as the Krugersdrift Dam, was found to be more subject to changes in chemo-physical factors, e.g. pH and hardness, compared to that of treated sewage effluent.
This finding correlates with the higher concentrations of Fe measured in the former-mentioned habitat during certain months of the year.
The average wet mass concentrations of Fe and Mn in the muscle tissue for fish in treated sewage effluent (0.804 and 0.024 mg. g#F-#F1 respectively) and for fish in natural dam water (0.880 and 0.017 mg. g#F-#F1 respectively) were well below the recommended values set by health authorities for domestic water supplies.
In contrast, the concentrations of these metals were noticeably higher in the liver and kidneys of catfish.
As the latter concentrations approached the maximum permissible levels in the liver and kidneys of catfish, especially in the Krugersdrift Dam, these organs are not recommended for human consumption.
Mots-clés Pascal : Eau usée, Pollution eau, Aquiculture, Animal élevage, Poisson comestible, Contamination, Aliment, Fer, Manganèse, Métal lourd, Toxicité, Homme, Santé publique, Clarias gariepinus, Pisces, Vertebrata, République Sud Africaine, Afrique, Milieu eau douce
Mots-clés Pascal anglais : Waste water, Water pollution, Aquaculture, Farming animal, Edible fish, Contamination, Food, Iron, Manganese, Heavy metal, Toxicity, Human, Clarias gariepinus, Pisces, Vertebrata, South Africa, Africa, Freshwater environment
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0152648
Code Inist : 002B03H. Création : 199608.