缢蛏家系生长与消化酶活性的比较

两次对6个缢蛏家系(A1、B1、C1、D1、E1和F1)生长性状(壳长、壳高、壳宽、总重和软体部重)进行测量、分析,并测定其体内淀粉酶活性和纤维素酶活性。发现缢蛏胃、消化盲囊等器官内淀粉酶活性较高,而纤维素酶的活性很低,消化酶活性与其滤食微藻的食性有关系。对比缢蛏生长性状的增长和消化酶活性的提升,结果表明家系D1的5个生长性状均取得最大值,且与家系A1、B1、C1、E1及F1存在显著差异(P0.05)。家系F1的5个生长性状均取得最小值,且各性状显著小于家系D1。随着日龄的增长,各个家系缢蛏个体的淀粉酶活性和纤维素酶活性都有所增长,2次的测量值显示同样的趋势,D1C1E1A1B1F1。发现缢蛏消化酶活性与生长发育相关,较快的生长速度对应较强的消化生理机能,高水平的消化酶活性有利于缢蛏对营养物质的消化吸收并转化为生长发育所需的能量。

Comparison of the growth traits and digestive enzyme activities of families of Sinonovacula constricta

Five growth traits of Sinonovacula constricta in six families were determined twice,including the shell length,height,and width,total weight,and the weight of soft part.The result showed that the activity of amylase was high and the activity of cellulase was low in stomach and digestive diverticula.There was a direct correlation between the digestive enzyme activity and the feeding habits of its filter-feeding microalgae.The growth traits and the enhancement of the digestive enzyme activity reflected that:1) all five growth traits of Sinonovacula constricta in family D1 reached the maximum values and obvious differences existed between D1 and other four families;2) all five growth traits of Sinonovacula constricta in family F1 reached the minimum levels that were significantly lower than those in family D1.The activties of amylase and cellulase in each of all S.constricta families increased with the growth of Sinonovacula constricta.Two measured values showed the same trend (D1＞C1＞E1＞A1＞B1＞F1).The digestive enzyme activity was found to be related to the growth and development ofSinonovacula constricta,and the faster,the growth speed,the stronger,the digestive function.A high digestive enzyme activity would contribute to the digestion and absorption of nutrients and their conversion to energy necessary for the growth ofSinonovacula constricta.