The effect of dietary protein on the enzymes and intestinal structure of Apostichopus japonicus
饲料粗蛋白含量对刺参消化酶及消化道结构的影响

To investigate the effect of dietary crude protein levels on the growth, protease or amylase activity, and the intestinal structure of Apostichopus japonicus, a feeding experiment was conducted with six semi-purified diets with protein content of 12%, 16%, 20%, 24%, 28%, and 32%. The results showed that growth performance, protease or amylase activity and the intestinal structure of sea cucumbers were significantly affected by dietary protein content. Intestinal protease or amylase activity could not only adapt for the diet crude protein, but also changed as feeding time. The histology observation showed that the mid-intestinal structure was affected by dietary content of crude protein.