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The aim of the present study was to investigate the growth performance of Nile tilapia immersed in 17α-methyltestosterone (MT) and recombinant giant grouper growth hormone (r El GH), and fed a r El GH-enriched diet. A total of 200 tilapia larvae aged 10 days and 14 days post hatching was immersed in 1 liter of 30 g/L saline water for 3 minutes, then in freshwater containing either MT, MT+r El GH, or r El GH for 4 hours. The MT dose was 2.0 mg/L and r El GH was 2.5 mg/L. As control was treatment without MT and r El GH. Fish were maintained in 250-L aquariums for 6 weeks and then moved to net cages for 8 weeks of rearing. The r El GH-enriched diet was fed to the 6-week-old fish for a month, and then fed a non-enriched diet. Each treatment was triplicates. The result showed that the daily growth rate (DGR), biomass gain (BM), survival (SR) and feed (artemia nauplii) consumption during maintenance in the aquariums in the r El GH and MT+r El GH treatments were higher (P 0.05). Profits estimation in the MT and MT+r E l GH treatments were 63.38% and 57.91% higher than the control. The present study concluded that higher Nile tilapia farming performance could be obtanied by MT immersion in the larval phase and feeding juvenile on the r El GH-enriched diet.

Growth Performance of Nile tilapia Immersed in 17α-methyltestosterone and rElGH, and Fed a Diet Enriched with rElGH