Sex Reversal of Sarotherodon melanotheron and Evaluation of Growth Performance in Fresh Water Cultured System
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Date
2012-04-02
Authors
Kuton, M.P
Ayoola, S. O.
Akapo, M.K.
Journal Title
Journal ISSN
Volume Title
Publisher
International Digital Organization for Scientific Information
Abstract
A total of 2400 Sarotherodon melanotheron fry were reared in six (6) plastic (High density polyethylene) tanks for three months. Each tank was stocked with 400 fry of which three tanks T1 T1 and T1 1, 2 3, served as treatment tanks while the other three tanks T0 , T0 and T0 , served as control. The treatment tanks 1 2 3 were administered with 17á-methyl testosterone hormone, which functioned as a sex reversal hormone for 30 days and further reared for 60 days in which physico-chemical parameters were taken and growth performance was evaluated. The results show that temperature in the broodstook ponds was 29.5°C±1.2°C, Dissolve Oxygen (DO) of 6.222mg/L ±1.502 mg/L and hydrogen ion concentration (pH) value of 9.8±0.476. This did not alter spawning ability in fresh water. Water parameters for control were 29.5±1.2°C, 8.4 mg/L and 6.8±0.3 for Temperature, DO and pH respectively while treatment tank has temperature of 27.8±0.7°C, DO of 8.46±0.05 mg/L and pH values of 6.53±0.28. Sex reversal was however successful as spawning did not occur after treatment. Growth parameters were better in treatment tanks compared to control tanks, as growth was doubled in treatment tanks compared to control tanks, treated fish however has the better Mean Weight Gain (MWG), Specific Growth Rate (SGR) and also less but better Feed Conversion Ratio(FCR) with a value of 10.86±0.18g,
17.58±1.55g and 15.04±0.26g respectively. While control has lower MWG, SGR and higher but worst FCR value of 5.56±0.20g, 10.31±1.79g and 29.44±1.10g. The results showed that S. melanotheron treated with 17á-methyl testosterone hormone achieved more growth in the same rearing time with the same quantity of feed. This result
promotes the use of Methyl-testosterone in fish farming of S. melanotheron brackish water species) as more weight, length and hence growth is achieved in a lesser time with less feed consumption.
Description
Staff publications
Keywords
Sex reversal , Growth performance , Cultured system , Research Subject Categories::NATURAL SCIENCES
Citation
Kuton, M.P, Ayoola, S.O and Akapo. M.K (2012). Sex Reversal of Sarotherodon melanotheron and Evaluation of Growth Performance in Fresh Water Cultured System. World Journal of Fish and Marine Sciences, Vol.4(2), 165-169