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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Effects of 17α-methyltestosterone (17α-MT) in rearing water on sex reversal of Nile tilapia (Oreochromis niloticus) were investigated and optimum conditions as initial treatment time, concentrations and treatment durations of hormone were evaluated in this study.
For the study of the optimum initial treatment time, 0 to 20-day-old fry were treated by immersion in a 500 ppb solution of 17α-MT. Desirable results were obtained at 12-day-old fish as 86.4% of male induction rates and this frequency was obviously higher than the other age groups.
Twelve-day-old fry were immersed in 17α-MT solutions at concentrations of 0~2,000 ppb for 24 hours for the study of dose dependent relationship between sex ratios and concentrations of 17α-MT. Male induction rates of all treated groups were higher than 80%. X² values against the sex ratio of control group indicate that sex reversal has taken place effectively in all experimental groups (P<0.001). Futhermore, 500 ppb treated groups showed highest male incidence of 86.4%.
Effects of 5 different durations (0, 12, 18, 24 and 30 hours) treated with 1,000 ppb of 17α-MT were also evaluated. Male induction rate from 0 to 24 hours treated group was increased with treatment durations. However, male incidence of 30-hour treated group (84.0%) was sligthly decreased compare to the 24-hour treated group (85.2%).
It is concluded that immersion treatment using 17α-MT on O. niloticus is possible on sex reversal at low concentration of 500 ppb and short treatment durations within 24 hours with 12-old-day fry.
For the study of the optimum initial treatment time, 0 to 20-day-old fry were treated by immersion in a 500 ppb solution of 17α-MT. Desirable results were obtained at 12-day-old fish as 86.4% of male induction rates and this frequency was obviously higher than the other age groups.
Twelve-day-old fry were immersed in 17α-MT solutions at concentrations of 0~2,000 ppb for 24 hours for the study of dose dependent relationship between sex ratios and concentrations of 17α-MT. Male induction rates of all treated groups were higher than 80%. X² values against the sex ratio of control group indicate that sex reversal has taken place effectively in all experimental groups (P<0.001). Futhermore, 500 ppb treated groups showed highest male incidence of 86.4%.
Effects of 5 different durations (0, 12, 18, 24 and 30 hours) treated with 1,000 ppb of 17α-MT were also evaluated. Male induction rate from 0 to 24 hours treated group was increased with treatment durations. However, male incidence of 30-hour treated group (84.0%) was sligthly decreased compare to the 24-hour treated group (85.2%).
It is concluded that immersion treatment using 17α-MT on O. niloticus is possible on sex reversal at low concentration of 500 ppb and short treatment durations within 24 hours with 12-old-day fry.
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UCI(KEPA) : I410-ECN-0101-2009-529-015333463