EFFECTS OF DIFFERENTIAL DOSE AND DURATION OF 17- METHYLTESTOSTERONE TREATMENT ON SEX REVERSAL OF NILE TILAPIA, OREOCHROMIS NILOTICLIS AT DIFFERENT AGE GROUPS UNDER INDIAN PERSPECTIVESUMAN BHUSAN CHAKRABORTY, ADITY SARBAJNA, DEBASIS MAZUMDAR AND SAMIR BANERJEE
Two sets of experiments are conducted to determine the relationship between the dose, duration and initiating age of fish for 17 -methyltestosterone treatments to produce all male population in Nile tilapia Oreochromis niloticus under the ecological and socioeconomic condition of India. Fishes of 3 days and 12 days of age are subjected to various doses of hormone like 5 mg/kg, 10 mg/kg, 20 mg/kg and 30 mg/kg of dry pelleted food for differential time period of 15 days, 30 days, 45 days and 60 days under the same culture conditions. It is found that 12 days old fish show a lower percentage of males than that in 3 days old fish, even after treatment with the same dose and duration regime. Again, the lowest dose or duration of hormone treatment cannot produce sufficient proportion of males while the highest dose or duration regime is not advocated under the socioeconomic condition of India. Thus, it may be concluded that a treatment regime of 10 mg/kg hormone for 30 days with 3 days old fish can be the critical criteria to induce commercially feasible sex reversal for producing all male population in Nile tilapia.
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