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Growth performance and nutritional utilization efficiency of vitamin C in the diets of African catfish Clarias gariepinus(Burchell 1822)fingerlings

O.K.GBADAMOSI.1,J.A.DARAMOLA.2,N.R.OSUNGBEMIRO.31.Department of Fisheries and Wildlife,Federal University of Technology,P.M.B.704,Akure,Ondo State,Nigeria2.Aquaculture and Fisheries Unit,Bells University of Technology,P.M.B 1015 Ota,Ogun State,Nigeria3.Department of Biological Sciences,Adeyemi College of Education,Ondo,Ondo'State,Nigeria  
Ascorbic acid is involved in several physiological functions involving growth,development,reproduction,wound healing,and response to stresses.It plays a significant role in the immune response and resistance of fish to infectious diseases.The inability of many fish species to synthesize ascorbic acid(AA)or vitamin C,which is essential for fish growth,health and reproduction,is well documented(Dabrowski,1990;Soliman et al.,1986).Ascorbic acid must therefore be supplied via feed especially in intensive fish farming.The symptoms associated with ascorbic acid deficiency are also well documented for many cultured fish(Halver et al.,1989;Sadnes et al.,1992).Due to the multiple role of ascorbic acid in various metabolic pathways,a better understanding of the mechanism through which ascorbic acid as a nutritional element influences the immune systems in modern intensive fish farming is necessary.It is therefore prudent to investigate and establish the ascorbic acid requirement of catfish on a species by species basis using measures of growth performance and nutrient utilisation.
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