摘要
本文研究了花尾胡椒鲷仔、稚鱼发育时期不同日龄的三种消化酶活性的变化。早期仔鱼已具有一定的蛋白酶、淀粉酶和脂肪酶活性 ,蛋白酶比活力在仔稚鱼转变期和稚鱼向幼鱼转变时明显下降 ,淀粉酶活性随日龄增加呈下降趋势 ,内源营养向外源营养转换过程中 ,脂肪酶活性先升后降 ,进入稚鱼期后比活力迅速再次提升。结果表明 ,消化酶活性的变化与仔、稚鱼发育过程中形态变化具相关性。混合营养期结束后 ,1 3日龄仔鱼的三种酶活性均下降 ,且比活力很低 ,以及稚、幼鱼转变期蛋白酶和脂肪酶活性也出现较大幅度降低 ,说明消化酶活性在仔、稚鱼发育关键时期处在较低水平 ,可能是此期间高死亡率的原因之一。
Activities of digestive enzymes protease, amylase and lipase in yellow spotted grunt (Plectorhynchus cinctus) were measured from 6d to 49d. The early stage larvae possessed activated enzyme to digest protein, starch and lipid. Protease activity decreased notably during the first few days after commencement of completely exogenous feeding and the days before the beginning of young stage. Specific activity of amylase trended to decline with age. Lipase showed two peaks of specific activity at 9d and 39d. It is suggested that the activities of the digestive enzyme of larval and juvenile Plectorhinchus cinctus are associated with morphological changes during transition period and the low digestive enzyme activity at 13d and 49d may be the cause of high mortality of the larva and juvenile.
出处
《台湾海峡》
CAS
CSCD
2000年第2期201-204,共4页
Journal of Oceanography In Taiwan Strait
关键词
花尾胡椒鲷
仔鱼
稚鱼
消化酶
活性
鲷鱼
Plectorhinchus cinctus, larval and juvenile fish, digestive enzyme activity
