Effect of Feeding with 17-alpha-Methyltestosterone in Different Periods on Sex Reversal of Tilapia (Oreochromis niloticus L.)

Sezgi H. B., Bekcan S.

JOURNAL OF AGRICULTURAL SCIENCES-TARIM BILIMLERI DERGISI, cilt.14, sa.3, ss.222-229, 2008 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 14 Sayı: 3
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1501/tarimbil_0000001034
  • Dergi Adı: JOURNAL OF AGRICULTURAL SCIENCES-TARIM BILIMLERI DERGISI
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.222-229
  • Anahtar Kelimeler: 17-alpha-methyltestosterone, tilapia, Oreochromis niloticus, sex reversal, ANDROGEN
  • Ankara Üniversitesi Adresli: Evet

Özet

The purpose of this research is to determine the sex reversal of the Nile tilapia fries fed in separate times with dietary including 17-alpha-methyltestosterone (MT) hormone. The experiment was conducted in five groups and two replicate at 28 degrees C. The fries were fed with diet containing 60mg/kg MT for 28 days from 1, 5, 10 and 20 days after yolksac absorption. At the end of this period, all groups were started to feed with control diet. The resulting sex ratio in the control group is 55% male and 45% of female. Maximum ratio of sex reversal with value of 100% was observed in the 2(nd) group fed with diet including MT from first day after yolksac absorption. In 3(rd), 4(th) and 5(th) groups; the sex ratios were determined as 90%, 95% and 90% male; 10%, 5% and 10% intersex respectively. These results indicate that the effect of the hormone on the sex reversal is, parallely decreasing with age and weight of the tilapias fed with diet including hormone.