Toxicity effect of varying concentrations of Raphia vinifera fruit extract on African Catfish (Clarias gariepinus Burchell 1822) Fingerlings

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Idowu, A.A
Ayoola, S. O.
1Nwekoyo, V.E
Adeosun, F. I.
Adesiyan, G.E
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Faculty of Agriculture, Federal University Dutse, Jigawa State, Nigeria
This study is aimed at evaluating the toxicity effect of Raphia vinifera on the hematological and histopathological parameters of Clarias gariepinus fingerlings. Fish samples with an average weight of ±2.00g and an average length of ±8.00cm were obtained from Eweje Fish Farm, Odeda Ogun State. The fruits of Raphia vinifera were sourced from the fresh water swamp forest of Tata village in Ilaro Local Government Area Council of Ogun State, Nigeria. The fruit extract was used in determining the range test for 24hrs. A range of 5g/L, 3.75g/L, 2.5g/L, 1.25g/L and 0g/L (control) were obtained and used in determining the toxicity effect for 96 hrs on fingerlings catfish (C. gariepinus), by studying the mortality rate of fish exposed to R. vinifera fruit extract, and recording the number of mortalities every 12hrs. The susceptibility of C. gariepinus to the effects of the fruit extract was duration and concentration-dependent. Fish mortality was found to be associated with the decrease in pH and DO values. Although histopathological lesions were observed in the exposed and unexposed fish, the lesion in the unexposed fish was at a lesser extent compared to that of the exposed fish. The water in which the fish were stocked was analyzed to be at DO 5.34±0.05 mg/L; pH, 6.75±0.02; temperature, 20±0.02°C; conductivity, 91.4±1.01 μS/cm; TDSs, 53.4±0.81 mg/L levels respectively. There were significant differences (P<0.05) in all the concentrations as mortality increased with time of exposure. The study shows that the use of R. vinifera fruit extract at higher doses produced 100 % mortality rate in C. gariepinus. It is therefore advised that 100% dose of the extract should be prohibited as it can destroy both egg and fingerlings of fish species.
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Haematology , Hispathology , Raphia Vinifera , Clarias gariepiuns , Research Subject Categories::NATURAL SCIENCES
Idowu A.A,Ayoola S.O,Nwekoyo V.E,Adeosun F.I and Adesiyan G.E. (2019). Toxicity effect of varying concentrations of Raphia vinifera fruit extract on African Catfish (Clarias gariepinus Burchell 1822) Fingerlings. Dutse Journal of Agriculture and Food Security, 6(1) 11-28.