Cost-Benefit Analysis and Growth Effects of Pelleted and Unpelleted On-Farm Feed on African Catfish (Claries Gariepinus Burchell 1822) in Earthen Ponds

Abstract

Fish feed constitutes 40-60% of the total operational costs of a fish farm. Commercial feeds are often too expensive for rural fish farmers. Consequently, farmers use non-conventional and locally available fish feed ingredients including agro-industrial by-products. These feeds have not led to increased pond productivity due to poor processing, higher fibre content, and anti-nutritional factors that limit nutrient bio-availability. Farmers have not embraced processing of fish feeds because the cost-effectiveness of processing has not been clearly demonstrated. The African catfish (Clarias gariepinus) is an important farmed fish in sub-Saharan Africa hence the need for research on its nutrition and growth performance. The growth performance and cost-benefit of using pelleted diets formulated from locally available feed ingredients on C. gariepinus were evaluated in a rural African setting. The experiment included diets that differed in the ingredients and form used (pelleted and un-pelleted). Four isocaloric and isonitrogenous diets were formulated from freshwater shrimp (Caridina nilotica), rice bran (Oryza sativa) and wheat bran (Triticum aestivum). The diets were C. nilotica and wheat bran pelleted (CWBp), C. nilotica and wheat bran un-pelleted (CWBup), C. nilotica and rice bran pelleted (CRBp), and C. nilotica and rice bran un-pelleted (CRBup). The diets were fed to C. gariepinus fingerlings (mean initial weight 1.75±0.03g), in triplicates for 5 months. The pelleted diets showed significantly better performance (P<0.05) compared to the un-pelleted diets. Fish grew to a weight of 266.77±6.21g on CWBp, 224.9±3.91g on CRBp, 211.38±4.46g on CWBup and 190.87±4.47g on CRBup. Cost benefit analysis of the pelleted and un-pelleted diets indicated positive net returns of US$ 180.1 for CWBp, US$142.5 for CRBp, US$ 126.8 for CWBup and US$ 115.5 for CRBup. The CWBp had significantly higher net returns than the other diets. This paper demonstrates that although on-farm pelleting of diets adds extra cost of labour, pelleted diets are cost-effective and should be incorporated as an essential part of on-farm feed production.

Key words: Catfish, feed, pelleting, cost-effectiveness, pond