Abstract
One of the major problems facing aquaculture development in Nigeria is the non-availability of quality and affordable fish feeds. This study investigated the nutritional suitability of Azadirachta indica seed cake as alternative protein source to soya bean meal in the diet of African catfish (Clarias gariepinus). The neem seed cake was processed using water washed method to reduce the bitterness and toxicity of the cake. Different concentrations of neem seed cake meals (0, 25, 50 and 75%, designated as DI, DII, DIII and DIV, respectively), were incorporated into 40 % crude
protein diet. C. gariepinus (6.00±0.93- 6.06±0.87g weight and 8.03±0.83 - 8.46±0.21cm long) fingerlings were stocked in fifty litre plastic trough in replicates and feed for a period of eight (8) weeks. Growth performance and nutrient utilization indicated that the control and fish fed 25% name seed cake (NSC) recorded the best weight gain (23.24g and 20.8g), respectively. Growth significantly (P<0.05) decreased by 17.55% and 28.58% levels of inclusion. A similar trend was observed in specific growth rate and feed intake. However, feed conversion ratio, protein efficiency ratio and net protein utilization were not significantly different (P>0.05). The result suggests that the Neem seed cake can be incorporated at 9.62% in the diet of the African catfish (Clarias gariepinus) without compromising fish growth and nutrient utilization. Therefore the use of this unconventional ingredient can be encouraged in this era of competing demand for conventional ingredients.
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