兴凯湖四种野生鲌消化酶活性比较研究

本文分析兴凯湖定点同日随机采集的翘嘴鲌Culter alburnus、蒙古鲌C.mongolicus、兴凯鲌C.dabryi和红鳍原鲌Cultrichthys erythropterus肝胰脏和肠道消化酶的活性,比较2龄鱼和≥3龄鱼两实验组样本的特点和差异。结果表明:四种鲌肠道蛋白酶和淀粉酶活性显著高于肝胰脏;蒙古鲌肝胰脏脂肪酶活性高于肠道,其他三种鲌类肠道脂肪酶活性高于肝胰脏(P0.05)。2龄和≥3龄鱼蒙古鲌肝胰脏蛋白酶活性最高,翘嘴鲌和兴凯鲌分别次之(P0.05);2龄鱼兴凯鲌、蒙古鲌、翘嘴鲌肠道蛋白酶活性较高,≥3龄鱼蒙古鲌和红鳍原鲌显著高于兴凯鲌、翘嘴鲌(P0.05)。2龄组和≥3龄鱼翘嘴鲌肠道脂肪酶活性和肝胰脏、肠道淀粉酶活性均较高,≥3龄蒙古鲌和兴凯鲌肝胰脏脂肪酶活性显著高于翘嘴鲌和红鳍原鲌(P0.05)。本研究结果对科学保护与利用相关鱼类有参考价值。

Comparison of Activities of Digestive Enzymes Among Four Culter Species in Xingkai Lake

The enzyme activities in hepatopancreas and intestine were compared in four culter species including 2+ and ≥ 3+ year old Culter alburnus, C. mongolicus, C. dabryi and Cultrichthys erythropterus. The results showed that there were significantly higher pro-tease and amylase activities in intestine than those in hepatopancreas in the four culter species (P < 0.05). The lipase activity was found to be higher in intestine than in hepatopancreas in three species Culter alburnus, C. mongolicus, C. dabryi, expect for Cul-trichthys mongolicus in which there were higher protease and amylase activities in hepatopancreas than those in intestine. The 2+ and ≥ 3+ year old C.mongolicus had significantly higher protease activity in hepatopancreas, followed by C.alburnus and C.dabryi (P <0.05). There were higher lipase activity in intestine and amylase activity in hepatopancreas in C. alburnus than in other species in both age classes, while there was higher lipase activity in hepatopancreas in ≥3+ year old C. mongolicus and C. alburnus than in the two other species(P < 0.05). The findings provide reference for the related fish conservation and sustainable utilization.