Dietary protein and lipid optimum requirements for on-growing golden Pompano (Trachinotus ovatus)
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Received:December 06, 2018  Revised:January 16, 2019
DOI:10.12024/jsou.20181202459
Key Words: on-growing period  golden pompano  optimum protein requirement  optimum lipid requirement  specific growth rate
Author NameAffiliation
HU Haibin Animal Husbandry and Fisheries Research Center of Guangdong Haid Group Co., Ltd., Guangzhou 511400, Guangdong, China
State Key Laboratory for Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, Hubei, China
Sheng Long Bio-Tech International Co., Ltd of Haid Group Co., Ltd., Long An 850000, Vietnam 
QIAN Xueqiao Animal Husbandry and Fisheries Research Center of Guangdong Haid Group Co., Ltd., Guangzhou 511400, Guangdong, China 
XIE Shouqi State Key Laboratory for Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, Hubei, China 
YUN Biao Animal Husbandry and Fisheries Research Center of Guangdong Haid Group Co., Ltd., Guangzhou 511400, Guangdong, China 
ZHUANG Jiecheng Sheng Long Bio-Tech International Co., Ltd of Haid Group Co., Ltd., Long An 850000, Vietnam 
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Abstract:
      Six isolipidic practical diets were formulated to contain different levels of fish meal (six graded protein levels were named P1-P6 respectively). Fish was fed by hand twice daily until apparent satiation. The growth performance of fish including weight gain rate as well as protein efficiency rate significantly increased (P<0.05) with increasing dietary protein levels (P1-P6) and then kept steady (P>0.05). Growth performance of fish fed P4, P5 and P6 was significantly higher than that of fish fed P1, P2 and P3 (P<0.05). While feed conversion ratio and feed intake decreased significantly (P<0.05) with increasing levels of dietary protein up to 49.75% and remained nearly the same thereafter. Feed conversion ratio and feed intake in P4 and P5 were significantly lower than those of fish fed P1, P2 and P3 (P<0.05). Regression analysis showed that the recommended optimum dietary protein level for on-growing golden pompano was 49.75% (mass fraction). On the basis of dietary protein requirement, another 12-week feeding trial was conducted to evaluate dietary lipid requirement for on-growing golden pompano. Six isocaloric practical diets were formulated to contain different levels of soybean oil (six graded lipid levels were named L1-L6 respectively). With the increase of dietary lipid levels (L1-L6), growth performance of fish including weight gain rate and protein efficiency rate first significantly increased and then kept steady (P>0.05). Growth performance of fish fed L3, L4, L5 and L6 was significantly higher than that of fish fed L1 and L2 (P<0.05). Feed conversion ratio and feed intake decreased with increasing levels of dietary lipid up to 12.20% and remained nearly the same thereafter. Feed conversion ratio and feed intake in L3, L4, L5 and L6 were significantly lower than those of fish fed L1 and L2 (P<0.05). Regression analysis showed that the recommended optimum dietary lipid level for golden pompano (121-580 g) was 12.20%-12.27% (mass fraction).