Acute toxicity of crude oil from NNPC and artisanal refineries in Niger Delta on selected aquatic biota

The spill of Crude oil from artisanal refineries and government owned pipelines has become recurrent situation in the Niger Delta, leading to devastating effects on aquatic ecosystem. toxicity NNPC (Nigerian National Petroleum Corporation) refinery selected Bolo, Twon-Brass Ekpemu Delta were investigated. physicochemical properties products short fall standards for refineries, as they contained impurities. was tested using three representatives different trophic levels habitat; Fish (Tilapia guineensis), Crusteceans (Paleamonetes africanus), Moluscs (Tympanotomus fuscatus). LC50, NOEC, LOEC, TUa indices used assessment crude test organisms. study revealed that all samples toxic degree showed following trend; (LC50 – 0.02ppt)> 0.06ppt)> Bolo 0.11ppt)> 4.63ppt), while sensitivity was; Tilapia guineensis > Paleamonetes africanus Tympanotonus fuscatus. findings further emphasize need control spillage into