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The discharge of produced water (PW) and drill cuttings from oil operations may elicit varied toxicity in fresh, brackish and marine organisms when exposed. The Niger Delta region which is the oil and gas province of Nigeria have incessantly been recipients of produced water. The study was aimed at investigating the toxic effects of produced water on freshwater fish- Oreochromis niloticus and brackish water shrimp- Palaemonetes africanus in the Niger Delta region of Nigeria. Probit toxicity tests were conducted on the organisms through a 96 h bioassay using produced water (PW) obtained from Mobil, Qua Iboe Terminal (QIT) in Eket, Akwa Ibom State, Nigeria. The organisms were tested in separate tanks containing produced water of 0.0, 100, 200, 400, 800 and 1000 mL, mixed with 2 L of habitat water (fresh/ brackish water). The physicochemical properties of the mixtures were determined by multiparameter hand held probe and atomic absorption photometer (AAS). The physico-chemical parameters, particularly the pH, and conductivity of the PW at 26.5 °C were significantly higher (p |
