THE EFFECTS OF 17α-METHYLTESTOSTERONE ON SEX REVERSAL OF RED TILAPIA (OREOCHROMIS NILOTICUS X OREOCHROMIS MOSSAMBICUS) IN THE FREE-SWIMMING STAGE

Authors

  • SupamasSriwongpuk

Keywords:

17α-Methyltestosterone, Sex reversal, Redtilapia(OreochromisniloticusxOreochromis mossambicus), Free-swimming stage

Abstract

The effects of 17α-Methyltestosterone (MT) on sex reversal of Redtilapia (Oreochromisniloticus xOreochromis mossambicus) in the free-swimmingstage by immersion and feeding techniques were studied at the Department of Fisheries, Faculty of Agricultural Technology, Rajamangala University of Technology Thanyaburi, Pathumthani Province from April to July 2017. The experimental design was a factorial experiment in CRD which studied two factors: 1) sex reversal by immersion treatment of 17α-MT (0, 150 and 300 µg/l) for 3 hours (T1, T2,and T3) and 2) sex reversal by feeding treatment of 17α-MT (40, 60 and 80 mg/kg) for 28 days (F1, F2and F3). Results from these studies indicated that duringthe free-swimming stage, the immersion treatment of 17α-MT in 300 µg/l for 3 hours (T3) had the highest growth rate in terms ofweight, total length (28 days), ADG, FCR and survival rate (0.731 g, 3.340 cm, 0.024 g/d, 0.627 and 95.443 % respectively). The immersion treatment of 17α-MT in 150 µg/l for 3 hours (T2) had amedial growth rate among the other factors. The immersion treatment of 17α-MT in 0 µg/l for 3 hours (T1) hada minimal growth ratebut had the highest sex ratio of males (83.889 %).  The effects on sex reversal by feeding treatment of 17α-MT in 60 mg/kg for 28 days (F2) had the highest growth rate in terms ofweight, ADG and FCR (0.644 g, 0.022 g/d and 0.714 respectively). The effects on sex reversal by the feeding treatment of 17α-MT in 80 mg/kg for 28 days (F3) had a medial growth rate and the highest survival rate (95.037 %)and sex ratio of males (85.667 %). The effects on sex reversal by feeding treatment of 17α-MT in 40 mg/kg for 28 days (F1) had a good growth rate but the other factors were minimal.

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Published

2019-04-29

How to Cite

SupamasSriwongpuk. (2019). THE EFFECTS OF 17α-METHYLTESTOSTERONE ON SEX REVERSAL OF RED TILAPIA (OREOCHROMIS NILOTICUS X OREOCHROMIS MOSSAMBICUS) IN THE FREE-SWIMMING STAGE. GEOMATE Journal, 16(56), 39–45. Retrieved from https://geomatejournal.com/geomate/article/view/2580