Zoology-Scholarly Publications

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Browsing Zoology-Scholarly Publications by Subject "African catfish"

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    Antibiotics, algal evaluations and subacute effects of abattoir wastewater on liver function enzymes, genetic and haematologic biomarkers in the freshwater fish, Clarias gariepinus
    (Elsevier Inc., 2021-01-30) Oyeniran, D.O.; Sogbanmu, Temitope O.; Adesalu, T.A.
    Abattoirs are positioned close to freshwaters in most developing countries where untreated wastewaters are discharged into with potential risk to aquatic life such as fish and ultimately human health. We assessed physicochemical parameters, antibiotics (oxytetracycline and diclofenac) and algal load of effluent collected from a major abattoir in Nigeria. Furthermore, liver function enzymes, genotoxic and haemotoxic effects of subacute concentration (10% of 96 hLC50 value) of the wastewater were evaluated over a period of 28 d in Clarias gariepinus (The African Sharptooth Catfish). The 96 hLC50 value of the abattoir wastewater against C. gariepinus was 154.14 mL/L (15.4%). Nitrates, phosphates, sulphates, chloride, ammonia, TDS, TSS, BOD5 and heavy metals (Fe and Pb) in the wastewater were above permissible limits while diclofenac and oxytetracycline were below detection limit (BDL). Microalgae in the wastewater were mostly Bacilliariophyta (Navicula spp.) (45.64%) and euglenoids (Euglena and Phacus spp.) (49.48%). Liver function enzymes (LDH, AST, ALT) level were higher in exposed fishes except for ALP which was lower at day 28 compared to control levels. Erythrocytic genotoxic indices (nuclear abnormalities) were significantly higher (p < 0.05) in the exposed fishes particularly at day 28 compared to control. Haematologic indices level such as WBC, MCV MCH, MCHC increased significantly (p < 0.05) while lymphocytes, HGB, RBC, HCT levels decreased significantly (p < 0.05) in the exposed C. gariepinus by day 28 compared to control. These results demonstrate potential adverse effects posed to aquatic fish species in the Ogun River by the discharge of the abattoir effluent. The microalgae species identified in the effluent may be explored for pre-treatment of the effluent before discharge in order to prevent eutrophication and increased pollutant load in the River. The study results will contribute to evidence-based environmental risk management of the River which is relevant to the UN SDGs 6 (clean water and sanitation), 11 (sustainable cities and communities) and 14 (sustaining life below water).
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    Toxicological Evaluation and Usefulness of Lipid Peroxidation as Biomarker of Exposure to Crude Oil and Petroleum Products Tested against African Catfish, Clarias gariepinus and Hermit Crab, Clibanarius africanus
    (Nature Environment and Pollution Technology, 2012-03) King, Michael A.; Sogbanmu, Temitope O.; Osibona, Adesola O.; Doherty, Victoria F.; Otitoloju, Adebayo A.
    The toxicological evaluations of crude oil, petrol, kerosene and diesel were carried out against the African Catfish (Clarias gariepinus) fingerlings and Hermit crab (Clibanarius africanus). On the basis of 96hr LC 50 value, petrol (LC 50 = 2.449 mL/L) was found to be the most toxic followed by diesel (LC 50 = 7.839 mL/L), kerosene (LC 50 = 8.095 mL/L), and crude oil (LC 50 = 9.355 mL/L) to Clarias gariepinus. For Clibanarius africanus also, petrol (LC 50 = 4.569mL/L) was the most toxic followed by kerosene (LC 50 = 8.705 mL/L), diesel (LC 50 = 13.852 mL/L) and (LC 50 = 35.955 mL/L). On the basis of the computed susceptibility factor, hermit crab was found to be 2x, 2x, 6.1x and slightly more tolerant than catfish when exposed to petrol, diesel, crude oil and kerosene respectively. The results of the lipid peroxidation assay against juveniles of C. gariepinus showed that the level of malondialdehyde (MDA) in the liver of fish exposed to sublethal concentrations of all the test chemicals increased significantly when compared to control animals. The observed increase in MDA levels in the liver tissues of test animals exposed to crude oil and refined petroleum products was recommended as a good biomarker for early detection of oil related pollution during biomonitoring programmes.