Abstract:

To select the suitable pond culture mode for juvenile Alosa sapidissima, juvenile Alosa sapidissima was used as material, and the digestive enzyme activities of juvenile Alosa sapidissima cultured in the outdoor pond and shaded pond were compared. The results showed that: at the earlier culture stage, the activity of amylase in the visceral mass of juvenile Alosa sapidissima cultured in outdoor pond was higher than that of shaded pond; in 43 days and 57 days, the activities of pepsin, trypsin and lipase in the visceral mass of juvenile Alosa sapidissima cultured in outdoor pond were higher than those of shaded pond, but in 15 days and 29 days, the situation was reverse. At the later culture stage, the activities of pepsin and trypsin in liver and stomach of juvenile Alosa sapidissima cultured in shaded pond were higher than those of outdoor pond in 79 days, 106 days and 120 days; and the activities of amylase and lipase in liver and stomach of juvenile Alosa sapidissima cultured in shaded pond were also higher than those of outdoor pond at 106 days and 120 days; the activities of pepsin and trypsin in the liver and stomach of juvenile Alosa sapidissima cultured in shaded pond were lower than those of outdoor pond in 92 days. Therefore, in the season of high temperature, the juvenile Alosa sapidissima should be cultured in outdoor pond directly.

Key words: Alosa sapidissima, growth, digestive enzyme activity, outdoor pond, shaded pond