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he low survival rates of the giant African catfish (Heterobranchus bidorsalis, Geoffroy St. Hiliare, 1809) juveniles in the Nigeria Aquaculture system is a disturbing phenomenon. Part of the reasons for the low survivals include cannibalism (Ugwu et al., 2006), nutritional problem (Faturoti et al., 1986; Nwosu et al., 2009, Okeke et al., 2016; Okeke et al., 2016 and Nwosu, 2017) and the environment (Ozmen et al., 2005). Freshwater fish are used as 96 hour bioassay test organisms (Kopperdaul, 1976) for the determination of crude oil toxicity. Many workers (Stobber et al., 1978; Cardwell, 1979) have reported on the toxicity resulting from oil spills that occurred in aquatic environments near big oil industries, and stated that fish larvae, fingerling and eggs are quite sensitive bioassay test organisms H. bidorsalis in the Nigeria waters is a highly esteemed hardy fish due to the possession of accessory airbreathing organs which, enable it tolerate diverse aquatic conditions (Reed et al., 1967). H. bidorsalis adults and juveniles nevertheless may be very sensitive to aquatic pollutants including crude oil and its products.

tropical journal of applied natural sciences

Studies on the Plasma Albumin and Globulin Contents of the African Catfish (Heterobranchus bidorsalis) Adult Injected with Graded Concentrations of Bonny-Light Crude Oil