THE TOXICITY OF DIESEL AND PETROL ON SESARMA HUZARDI: AN AFTERMATH OF OIL SPILLAGE ON A TROPICAL MANGROVE ECOSYSTEMOlusegun B. Samuel, Abimbola M. Solu and William 0. OdieteAbstract The effects of diesel spillage on a mangrove ecosystem at Atlas Cove, Lagos, Nigeria and the relative acute toxicity of diesel and petrol on mangrove hairy crab, Sesarma huzardi was reported and investigated respectively.The oil spill effects on mangrove ecosystem were evaluated through collection and identification of the dead macro invertebrate and destroyed vegetation along with the physico-chemical characterization of water samples taken from 4 different stations. The acute toxicity was carried out using 96h static non-renewal bioassay method. The spilled diesel killed a total of 345 individual animals (9 species). S. huzardi accounted for highest number (39.4%) of individuals killed while Callinectes amnicola (0.9%) accounted for the least. The spilled diesel killed 155 stands of Achrosticum aureum and 232 stands of Rhizophora racemosa. The observed physico-chernical parameters (TSS, 548.0-842.0mg/L; TDS, 5181.0- 7078.0mg/L; DO, 3.8-6.0mg/L; BOD, 25.0-76.0mg/L and THC, 2.0-3050.0mg/L) reflected perturbat
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