keywords: Masculinization, Goat testes meal, Bull testes meal, Clarias gariepinus
The growth response, sex ratio and economics of masculinized Clarias gariepinus using lyophilized bull and goat testes meal was evaluated. Masculinization of Clarias gariepinus was conducted using Methyl testosterone Hormone-treated diet (MTH), Lyophilized Bull Testis Meal (LBTM) and as well as Lyophilized Goat Testis Meals (LGTM) for four weeks. Lyophilization of the testes obtained from Kano abattoir was done following standard procedures. 1.5 mg/l MTH was mixed with 1Kg of Copens fish starter feed. The hatchlings were fed with the experimental diets for four weeks. The growth response and economics of masculinized C. gariepinus were evaluated. Results indicated that water temperature range during the experiment was (26.23-26.95oC), 7.55-7.60 for pH, 5.10-5.60 mg/l for dissolved oxygen were within appropriate ranges for good growth of C. gariepinus. Growth performance C. gariepinus indicated that fish fed lyophilized bull testes meal (LBTM) had the highest weight gain (1252.26 g) as well as length gain of 24.33 cm, this was followed by lyophilized goat testis meal fed treatment (LGTM) with 1188.67 g weight gain compared to commercial feed. The cost and return analysis of masculinization of C. gariepinus indicated that the lowest masculinization cost (N31, 430.00) as well as lowest net income (N43, 967.42) was obtained from control group, LBTM had N34, 930.00 masculinization cost and net income value of N64, 766.13 being the highest income obtained, LGTM had N34, 869.13 masculinization cost as well as N36, 930.00 income cost. MTH group had the highest masculinization cost of N41, 930.00 and income of N48, 565.77. The cost of masculinization compared with the net income shows that LBTM showed better output with the net income of N64, 700.13 while MTH (48,565.47) had the least net income. Conclusively, LBTM masculinized C. gariepinus gives better growth and economic returns, therefore should be adopted by fish farmers for to boost growth of C. gariepinus.
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