Author(s): Ezike CO, Echor FO and Agbo AN

Abstract: The toxicity and PAH of C. gariepinus (0.98±0.01g, n=480) to 1, 3, 6, 9, 12 and 0.0 ml/L of BLCO oil was determined and were exposed to 3 treatment sublethal concentrations (2.40, 1.20, 0.60 (corresponding to 1/16, 1/8 and 1/4 of 96h LC₅₀) and 0.00 ml/L of WSF of BLCO in triplicate replications of 60 fish per treatment for 10 weeks. The 96h median lethal concentration of BLCO to the experimental fish fingerlings was 9.6 ml/L. The mean ∑ 16PAH gave 6% compared to 11% that of its mean 8PAH. Mean TEQ and MEQ in 8PAH both corresponded to 11%, however BaP-TEQ in BLCO ranged from 0% in Chry to 84% in DahA while BaP-MEQ ranged from 0% in Chry to 30% in DahA. The respective Benzo [a] Pyrene carcinogenic and mutagenic equivalents of Clarias gariepinus to BLCO was 2 and 9%. There was a significant difference (P<0.05) between mean weights, length and weight gain of exposed fish and control which depreciated along concentration gradient with the lowest growths at 2.4 ml/LWSF of crude oil. Mean weight gained by fish for the control group which stood at 0.24g reduced significantly by 31% to 0.07g in group exposed to 2.4ml/L WSF of BLCO. Mean FCR of the control group of fish with a value of 0.25 increased by 31% to 0.83 in exposed group to 0.24ml/L. liver glycogen and plasma glucose significantly reduced respectively by 16 and 8% to 0.64mg/g and 0.77mg/L at 2.4 ml/LWSF of crude oil- exposed fish which was indicative of hypoglycemia in the exposed fish.

DOI: 10.22271/fish.2020.v8.i6a.2447

Pages: 54-62  |  748 Views  202 Downloads

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