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Effect of temperature and methyltestosterone on male rate, growth and development of GIFT Nile tilapia Oreochromis niloticus
Author(s): 
Pages: 253-256
Year: Issue:  3
Journal: Journal of Dalian Fisheries University

Keyword:  GIFT Oreochromis niloticustemperature inductionmethyltestosteronemale rate;
Abstract: The effects of water temperature of 36 ℃ and diet containing 0. 6 μg/g methyltestosterone on male rate, growth and development of sibling prolarvae were studied in GIFT Nile tilapia Oreochromis niloticus. The results showed that the average male rate of (95. 0±1. 5)% was observed in the fish raised at 36℃ for 10 days. The aver-age male rate of only (73. 0±2. 4)% was found in the fish fed the diet containing 0. 6 μg/g methyltestosterone at 30 ℃ for 10 days. However, the fish fed the diet containing 0. 6μg/g methyltestosterone for 20 days had male rate of up to (96. 0±1. 3)%. The fish fed the diet containing 0. 6 μg/g methyltestosterone at 36 ℃ water for 10 days had male rate of(95. 8±1. 8)%, about 40% higher than the fish in the control group (only 56%) did. The best growth (5. 42 g/d in average)was observed in the GIFT Nile tilapia fed the diet containing 0. 6 μg/g methyltestos-terone at 36 ℃ for 10 days, significantly higher than that the fish in the other groups (P<0. 05). Histologically, most females raised at 36 ℃ exhibited bisexuality without normal ovulation. In conclusion, the male rate is signifi-cantly improved, close to the fish fed the diet containing methyltestosterone at a dose of 0. 6μg/g feed for 20 days, in larval GIFT Nile tilapia reared at 36 ℃ for 10 days. The findings provide clues for the fingerling production of GIFT Nile tilapia.
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