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Title: Cost implications of feeding Clarias gariepinus (Burchell) processed Sweetpotato (Ipomoea batatas)
Authors: Olukunle, O.
Odebode, S.
Taiwo, V. O.
Keywords: Growth performance
Nutrient utilization
Processed sweetpotato
Clarias gariepinus
Issue Date: 2008
Abstract: Maize is an expensive energy source of feedstuff in fish management especially during the off-season, hence the need to source and utilize other cheaper and non-conventional energy sources. This study investigated the growth performance of Clarias gariepinus fry fed processed sweetpotato meal as an energy source and its effect on the haematological and economic values. Three experimental diets were compounded such that maize was 100% energy source in Diet 1 (Control). In Diets 2 and 3, maize was replaced with sweetpotato tuber (SPT) and sweetpotato peel (SPP), respectively at 25% inclusion level. The diets were fed at 5% body weight to the C. gariepinus fry (0.21±0.03 g) in polystyrene net cages suspended in 3 concrete tanks (2X3X1.2m³) for 42 days in triplicates. Growth, nutrient utilization, haematological parameters were measured and cost evaluations were calculated. The mean weight gain (MWG) of the fry fed the maize-based diet (1.96) was significantly higher (P<0.05) than fry fed SPT (1.37) and SPP (1.27) respectively. The MWG of fry fed Diets 2 and 3 were not significantly different from each other. The feed conversion ratio (FCR) of the control and the SPT-based diets were not significantly different from each other but both were significantly different (P<0.05) from fish fed the SPP diet. The Growth Efficiency Feed Conversion (GEFC) values of the 3 diets were 0.50, 0.51 and 0.40 respectively and were not significantly different from each other. However, the protein efficiency ratio (PER) and the survival rates were significantly better in fry fed the SPT-based diet (0.51; 95%) than in fry fed the maize-based diet (0.50; 92%) and the SPP-based diet (0.40; 82%) respectively. The haematology results showed that the fry fed the control diet had the lowest MCV and WBC counts while the fry fed sweetpotatoe- based diets manifested moderately severe normocyctic normochromic anaemia and leucocytosis, which means that the maize diet showed better haematological indices. The economic evaluation revealed the need to produce SPT and SPP at low costs value to reduce the overall fry production cost. This study showed that sweetpotato- based diets have potential as substitute replacement for maize. In addition, it is recommended that sweet potatoe replaces maize at less than 25% inclusion for maximum growth, economic and haematological performace in catfish diets.
Appears in Collections:Academic Publications in Wildlife and Fisheries Management

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