DIETARY EFFECT OF SUBSTITUTING DIFFERENTLY PROCESSED MANGO (Mangifera indica) SEED MEAL FOR MAIZE ON GROWTH, FEED UTILIZATION AND BODY COMPOSITION IN Clarias gariepinus FINGERLINGS
Keywords:Mango seed kernel; Clarias gariepinus; Anti-nutrients; Processing; Survival rate
Rapidly increasing cost of cereal grains, most especially maize, used in fish feed production has resulted in high feed cost and has necessitated consideration for cheaper and locally available substitutes. This study assessed the effect of substituting mango (Mangifera indica) seed meal for maize on the growth performance, feed utilization and body composition in Clarias gariepinus fingerlings. Oven-dried mango seed meal (OMSM), soaked mango seed meal (SMSM), boiled mango seed meal (BMSM) and ash-treated mango seed meal (AMSM) were substituted for maize. Five isonitrogenous diets (at 40% crude protein) were formulated in which four of them had OMSM, SMSM, BMSM and AMSM respectively substituted for maize while the fifth diet (control) lacked mango seed meal. The five dietary treatments were each randomly arranged in triplicates to constitute fifteen treatment units. The diets were fed twice daily (07:00 - 08:00 hrs and 17:00 - 18:00 hrs) at 5% of body weight to 15 fingerlings stocked in each of fifteen glass tanks (50 × 40 × 40 cm3) for eight weeks. Diets and fish samples were analyzed using standard procedures. Data obtained such as Mean Weight Gain (MWG), Specific Growth Rate (SGR) and Feed Conversion Ratio (FCR) were subjected to descriptive statistics and one-way analysis of variance at p = 0.05. Post-treatment fish carcass crude protein (63.01 – 65.52%) significantly (p<0.05) exceeded the initial value (60.12%). The best MWG (18.34 g), SGR (2.78%/day) and FCR (0.76) were recorded for fingerlings fed with SMSM-supplemented diet and the least MWG (6.34 g), SGR (1.56%/day) and FCR (1.49) in those fed with OMSM-supplemented diet. This study indicated that processed mango seed meal improved fish growth and soaked mango seed meal produced the best growth and feed utilization in C. gariepinus fingerlings.