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Environmental contamination by pesticides, including the presence of chemical residues in aquatic wildlife, is a widespread ecological problem. Methyl parathion (MP), a widely used organophosphorate insecticide, is a potent neurotoxic in both vertebrates and invertebrates. The effect of a subchronic exposure to MP in aquatic organisms was evaluated in a(More)
This study was designed to determine the 72-h LC50 of lead for tilapia fish (Oreochromis hornorum), as well as the effect of exposure to sublethal lead concentrations (15, 23, 31, 39 and 47% of the LC50) on gill tissue lysosomal membranes of the fish and thaemoglobin concentration in blood. The LC50 value was found to be 202 mg Pb2+ l-1. Exposure to(More)
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