Maskulinisasi Ikan Nila Oreochromis niloticus dengan Pemberian Tepung Testis Sapi.

Abstract

The synthetic steroid 17α-Methyltestosteron (MT) is commonly used as a feed additive to produce male population of nile tilapia (Oreochromis niloticus). The use of synthetic testosterone hormone is not recommended in Indonesia. This study was conducted to evaluate the effect of natural testosterone hormone in bull testes meal (BTM) on the masculinization of nile tilapia. Experimental design that is utilized two factors experiments in completely randomized design. Fry kept in 40-L glass aquaria at a density of 40 fry/aquarium. Fry (7 dph) received the BTM for 7 days (T1), 14 days (T2) and 21 days (T3) and doses 0% (D1), 3% (D2), 6% (D3), and 9% (D4). Result, indicated that there were significant (P<0.05) differences between group treated by BTM and untreated group. In the BTM treated group, doses and duration of treatments are not significantly different. The percentage of male fish on the three treatments was 83.3% (9%-14d, 9%-21d, 6%-21d: doses and duration, respectively), higher than the other groups but not significantly different with all treated group. There were no significant difference on the survival rate of fry (95-99.5%) between all treatments. Survival rate was not affected by the treatment of BTM (not significant P≥0.05). The body growth rate were not different between BTM treated groups and untreated group. The highest growth performance of fry was obtained by the treatment of 9% BTM. Conclusion, the best of treatment is D3T2 (6% BTM and 14 days), resulted male fish 81.67%.