两种池塘养殖模式下美洲鲥当年鱼种消化酶活性的比较

旨在合理选择美洲鲥当年鱼种池塘养殖模式。以美洲鲥当年鱼种为试验对象,采用遮荫池塘和敞口池塘两种池塘养殖模式,比较美洲鲥当年鱼种消化酶活性的差异。结果显示：养殖前期,敞口池塘美洲鲥内脏团的淀粉酶活性均高于遮荫池塘的;在43天和57天时敞口池塘美洲鲥内脏团的胃蛋白酶活性、胰蛋白酶活性和脂肪酶活性均高于遮荫池塘,在15天和29天时则相反;养殖后期,遮荫池塘美洲鲥肝和胃组织中的胃蛋白酶和胰蛋白酶活性在79天、106天和120天均高于敞口池塘的;其淀粉酶和脂肪酶活性在106天和120天也都高于敞口池塘的,在92天时遮荫池塘中美洲鲥肝和胃组织中的胃蛋白酶和胰蛋白酶活性却低于敞口池塘。研究表明,在高温季节,美洲鲥当年鱼种养殖无需遮荫方式,可以直接采用敞口池塘。

Digestive Enzyme Activity of Juvenile Alosa sapidissima in Two Pond Culture Modes: Comparison

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.