人工环境饲养大麻哈鱼初步试验研究

大麻哈鱼（Oncorhynchus keta Walbaum）是典型的淡水繁殖、海水生长，溯河生殖洄游的冷水性鱼类。为了提高增殖放流回归效果和恢复与利用其资源，该文在人工调控环境条件下，进行了在淡水中由鱼苗饲养至幼鱼之后再移入海水中饲养至成鱼的试验研究。结果表明，从刚孵出的大麻哈鱼苗饲养至成鱼的技术是可行的。在淡水中大麻哈鱼苗饲养成活率显著提高，达到85%以上，能够正常发育生长至入海前的幼鱼。根据幼鱼的降河洄游习性，在适宜的时间，将大麻哈幼鱼由淡水中过渡到海水中，经人工饲养能够生长至成鱼。以工程技术手段创造大麻哈鱼的生长条件，是研究其生长发育特性和养殖的有效途径。该研究可为进一步开发工程化饲养大麻哈鱼技术提供参考。

Preliminary experiment study on rearing chum salmon in artificial environment

Chum salmon (Oncorhynchus keta Walbaum) is typical cold water fish that reproduces in freshwater, grows in seawater, and migrates to the upriver for spawning. In order to improve the proliferation and releasing return effect and restore the resources, the fish growth experiments were conducted to rear the fish fries to parr fish in fresh water, and rear the parr to the adult fish in sea water under the artificial conditions. The results showed that the technology of rearing the hatchlings of chum salmon to the adult fish was feasible. The rearing survival rate of Chum salmon fries in the freshwater environment improved evidently to 85%, and the fries could normally grow to the parr fish for seawater rearing. Parr fish rear in the sea water for appropriate time, which can grow to the adult fish. It is an effective way to research the growth and development characteristics by controlling the growth conditions with the engineering technology method.