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Author: search.filters.author.Pilapang, K.Subject: search.filters.subject.17 α-methyltestosterone

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    The effect of Moina sp. immersion with 17alpha-methyl testosterone (17MT) on growth performances and sex reversal of Nile tilapia
    (2023-07-01)
    Pilapang, K.
    ;
    Srijad, S.
    ;
    Yomla, R.
    The results found that Moina sp. immersion with 17alpha-methyl testosterone (17MT) has a non-effect on the growth performances and non-effect on the sex reversal of Nile tilapia. The higher length, weight, and specific growth rate were found in the PC (PC: 60 mg17MT/kg mixing commercial feed) and the NC (only commercial feed without 17MT) than in other groups (50 and 100 mg17MT/l immersing Moina sp.). The length and the weight of the PC and NC groups showed no significant difference. But these groups were different from the groups of 50 and 100 mg/l. The average length of the PC, NC, 50, and 100 mg/l were displayed at 2.67±0.08, 2.86±0.17, 1.45±0.07 and 1.46±0.02 cm, respectively. The average weight of the PC, NC, 50, and 100 mg/l was displayed as 0.40±0.07, 0.51±0.08, 0.08±0.10 and 0.07±0.01 g, respectively. The highest specific growth rate was found in the NC group (2.37±0.00%). The survival rate of the NC group was not significantly different from other groups. 17MT does not affect growth performances in the larval stage. However, dried Moina sp. immersion in 17MT could be caused an effect on growth performances and sex reversal.
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    Study on different concentrations and timings of 17α-methyltestosterone to accumulate in water flea (Moina spp.) from lab-scale
    (2022-01-01)
    Pilapang, K.
    ;
    Dandrit, D.
    ;
    Yomla, R.
    The different concentrations and immersion times of 17α-methyltestosterone (17MT) on the accumulation in water flea were investigated. Results were found that amount of 17MT of both groups in each period displayed significantly different (P <0.05) when compared to the control. The highest accumulation of 17MT was found at the concentration of 100 mg / L for 420 minutes equal to 0.46 ±0.10 mg/L. In contrast, it was found that the amount of 17MT in both concentrations of water at three times was not statistically significant (P> 0.05)in each treatment. Therefore, results indicated that the accumulation of 17MT in water fleas can be applied for using accumulated water flea to produce male tilapia.