STUDIES ON DIGESTIVE ENZYMES AND AMIND ACID OF LARVAL AND POST LARVAL STAGES OF PRAWN PENAEUS CHINENSIS (O'SBECK 1965)
Liu Yumei, Zhu Jinzhao, Wu Houyu and Shi Dianzu(Institute of Oceanology, Academia Sinica, Qingdao, 266071)
The larvae of prawn Penaeus chinensis were collected from Shrimp Farm,.Taoluo, Rizhao, in May, 1987. The adult prawns were collected from Jiaozhou Bay, Qingdao during spring and autumn, 1986. This experiment was conducted with the enzyme analytical method. The results indicate that:1. The activities of trypsin-like enzyme and pepsin were different in different stage of the larvae of prawn: Penaeus chinensis Zoea stage Mysis stage Post larval stage.The activities of trypsin-like enzyme and pepsin increased with growth. Activity of trypsin-like enzyme was about 4 times higher than that of pepsin.2. The activity of amylase in different stage was Zoea stageMysis stagePost larval stage. The activity of cellulase was fairly low. Activity of amylase was 6 to 13 times higher than that of cellulase. The activity of digestive enzyme in the larvae of prawn was lower than that in the adult prawn.3. The contents of amino acid in the larvae of prawn increased with growth. The contents, of amino acid in different stage are zoea stageMysis stagePost larval stage.