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An eight-week experiment was conducted to assess the effects of dietary incorporation of Fermented Orange (Citrus sinensis)Peel Meal (FOPM) at seven inclusion levels[0% (as control), 10%, 20%, 30%, 40%, 50% and 60% coded as Diet 1, Diet 2, Diet 3, Diet 4, Diet 5, Diet 6 and Diet 7 respectively] on the growth, feed utilization and survival of 280 Clarias gariepinus fingerlings. The fish were fed twice daily at 5% of their body weight. Proximate composition of fermented orange peel meal-supplemented diets and fish carcass was determined using standard procedures. Mean Weight Gain (MWG), Specific Growth Rate (SGR), Feed Conversion Ratio (FCR) and Fish Survival were determined. Data were analyzed using descriptive statistics and analysis of variance at p=0.05.Crude protein significantly (p < 0.05)increased from 58.30% in the initial pre-treatment fish to values ranging between 60.40% in fish fed Diet 6 and 62.40% in fish fed Diet 5. Fish fed Diet 2 (10% FOPM-supplemented diet) had significantly (p < 0.05) superior values of MWG (23.65 g), SGR (3.08%/day) and FCR (0.46) compared to fish fed Diet 1 and Diets 3 to 7 in which growth indices gradually reduced (MWG: 16.08–6.25 g; SGR: 2.53–1.42%/day and FCR: 0.57–1.08). Percentage survival was highest (82.50%) in fish fed Diet 2and lowest (67.50%)in fish fed Diet 7. The study clearly demonstrated that fermented sweet orange peel meal could effectively replace yellow maize meal up to 10% substitution levelin C. gariepinus fingerlings' diets without noticeable deleterious effects on growth, feed utilization and survival. ,

Key words:Unconventional feedstuffs Clariasgariepinus, Feed Processing, Protein Intake, Fish Nutrition