Optimum level of dietary protein and lipid for hybrid grouper, brown-marbled grouper (Epinephelus fuscoguttatus) X giant grouper (E. lanceolatus)
2019
Norfazreena Mohd Faudzi | Yong, Annita Seok Kian | Senoo, Shigeharu | Rossita Shapawi
A12-weeks experiment was conducted to determine the optimum level of dietary protein and lipid for hybrid grouper, brown-marbled grouper (Epinephelus fuscoguttatus) x giant grouper (E. lanceolatus). The hybrid grouper juveniles (body weight: 6.6 ± 0.1 g) were fed twice a day with 12 experimental feeds containing different levels of protein (45, 50 and 55%) and lipid (8, 12, 16 and 20%). Results showed that the fish fed with a different combination of protein and lipid levels did not significantly (p > 0.05) affect the growth performances. An increasing trend in growth was observed when protein and lipid levels increased from 45 to 55% and 8 to 16%, respectively. Protein sparing effects by lipid can be observed when lipid increased to 16% at any protein levels; however, the growth of fish was decreased at 20% of lipid. The lipid retention efficiency, body lipid, VSI, ISI and IPF were increased correspondingly with the lipid level from 8 to 20%. No significant effect (p> 0.05) was observed on the ADC of protein and lipid. Based on the regression analysis, the present study suggests that 50% of dietary protein and 16.5% of dietary lipid are the optimum requirements to be provided in formulated feed for the hybrid grouper.
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