盐度胁迫对高体革鯻幼鱼消化酶活力的影响

研究了盐度对高体革（Scortum barcoo）幼鱼消化酶活力的影响。在温度25±2℃下,将平均体质量为2.50±0.23 g的高体革幼鱼分别饲养在盐度0,5,8,11,13和16条件下20 d,检测幼鱼胃蛋白酶、淀粉酶和脂肪酶活性的差异。结果表明：盐度胁迫对高体革幼鱼胃蛋白酶活力有显著影响（P〈0.05）,对脂肪酶和淀粉酶活力有极显著影响（P〈0.01）。随着盐度的升高,胃蛋白酶活力先升后降,当盐度升高到13时又急剧升高;脂肪酶的活力则是随盐度的升高而受到抑制,当盐度升高到13时也急剧升高,盐度16时最高;而淀粉酶活力变化则是盐度升高时显著降低。这说明环境盐度对高体革消化酶比活力的影响比较大,不同消化酶随盐度变化规律有所差异。

Effects of Salinity on Digestive Enzyme Activities of Juvenile Jade Perch Scortum barcoo

Influence of salinity on digestive enzyme activity of juvenile jade perch Scortum barcoo was investigated in this study.Variations in specific activities of pepsin,amylase and lipase were studied in the juveniles with body weight of 2.50 ±0.23 g cultured at a salinity of 0,5,8,11,13 and 16 for 20 days at water temperature of 25±2℃.The salinity was showed to have significant effect（P0.05） on the activity of pepsin and to have very significant effect（P0.01） on the activities of amylase and lipase of juvenile jade perch Scortum barcoo.The activity of pepsin was showed to increase with the salinity rising first and then to decrease,the peak at a salinity of 13.The activity of lipase was inhibited by the salinity rising,but increased rapidly at a salinity of 13.The activity of the amylase,however,was found to be significantly decreased as the salinity rising.It can be concluded that the environmental salinity has influence on the digestive enzyme activities of the juveniles significantly,and different digestive enzyme activity will vary with the change in salinity.