Effects of dietary protein levels on growth in juvenile sea cucumber Apostichopus japonicus
ZHOU Wei,ZHANG Hui-jun,LI Zan-dong,ZHAO Zhi-gang
1.School of Life Science and Technology,Dalian Ocean University,Dalian 116023,China; 2.Key Laboratory of Mariculture,Agriculture Ministry,PRC,Dalian Ocean University,Dalian 116023,China
Abstract: The effects of dietary protein levels(6%,13%,20%,27%,and 34%)on energy budget in juvenile(initial body weight 3.79±0.06 g)sea cucumber(Apostichopus japonicus) were studied at water temperature of(14±0.5)℃,and a salinity of 31-31.5.The results showed that there were significant effects of dietary protein levels on the energy metabolism in the sea cucumber.The juveniles had the maximal feed conversion efficiency(5.58%) and specific growth rate(1.27%/d) and the minimal food conversion ratio(FCR)(1.13) when they fed the diet containing 19.48% of protein.Meanwhile,there was higher growth energy in the juveniles fed the diet containing 19.48% of protein than that in the juveniles fed the other diets.Energy budget equation of 100C=5.28G+27.24F+4.22U+3.46Rs+59.80Rf was observed in the juveniles fed the diet containing 19.48% of protein.