Abstract:
The present study was conducted to evaluate the effects of 17 a-methyltestosterone hormone on the growth performance of Nile Tilapia ( Orechromis niloticus). The study was conducted in the Meridian hatchery, Sonagazi, Feni from February, 2019 to January, 2020. Brood fish was collected from NAMSAI farm Thailand and BFRI, Bangladesh. Eggs were collected from the fish mouth and then disinfected and finally placed to the hatching tray and jar. Hatched larvae were placed to the 12 SRT tank and applied different dose of 17 a-methyltestosterone hormone treatments. The experimental treatments were T0 (Control), T1 (50 mg/kg), T2 (60 mg/kg), T3 (80 mg/Kg) and each treatment had three replications. Study showed significant higher growth performance in T 2 treatment. The results showed that mean weight of fish was significantly higher under T2 (533.5±1.249 g), mean length was under T2 (29.97±0.153 cm) and SGR was under T2 (4.259±0.0013) in comparison with other three treatments. The highest survival rate 87 .6% was obtained in T 2• Highest value
of FCR (1.8) was observed in T1 and lowest (1.2) was in both T2, T3, respectively. Highest sex reverse percentage was found in T2 (98%) followed by T3 (97.883%)
and T1 (77.833%), respectively. There was a strong interaction between 17
a-methyltestosterone hormone and growth performance and sex reversal of Nile Tilapia (p < 0.05, n = 4). This study suggests that use of 17 a-methyltestosterone hormone can improve growth performance of Nile Tilapia.
Keywords: Nile Tilapia (Oreochromis niloticus), Growth Performances, Sex Reverse, 17 a-methyltestosterone.
Description:
This Thesis is Submitted to the Department of Fisheries , University of Rajshahi, Rajshahi, Bangladesh for The Degree of Master of Philosophy (MPhil)
