Optimum dietary proportion of soybean meal with fish meal, and its effects on growth, digestibility, and digestive enzyme activity of juvenile sea cucumber Apostichopus japonicus
Liao, Mingling | Ren, Tongjun | He, Lijuan | Han, Yuzhe | Kong, Bill
The current study aimed to determine the effects of dietary proportions of soybean meal (SM) with fish meal (FM) on growth performance, digestibility, and digestive enzyme activity of juvenile sea cucumber Apostichopus japonicus. Diets with six different proportions of SM with FM (0/100, 20/80, 40/60, 60/40, 80/20, and 100/0) were fed to sea cucumbers (1.00 ± 0.01 g) for 80 days. With dietary SM proportions under 60 %, body weight gain and protein efficiency ratios first increased and subsequently decreased. Feed conversion ratios for diets with 60 % SM decreased initially and then maintained a minimum value. Sea cucumbers fed a diet containing 40 % SM showed significantly (P < 0.05) higher digestibility than those with other treatments, and showed significantly (P < 0.05) higher protease activity than sea cucumbers fed diets containing 0 and 20 % SM. Based on growth performance, we can conclude that the optimum dietary proportion of SM with FM for juvenile sea cucumbers is 60/40.
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