千岛湖水环境质量调查与保护对策

1992年7～8月,对大口鲇幼鱼进行了不同饲料喂养和驯化试验,对其摄食、生长进行了研究。试验表明,大口鲇生长迅速,尤其投喂适口的活鱼,其生长速度极快,21天增重2.67～4.60倍,比投喂鱼肉组的体重增长快37.9％～84.3％。具有早晚摄食的习性,平均每克体重日摄食活鱼量为0.1～0.2g,摄食鱼肉量为0.18～0.29g,其饲料系数前者为2.32～3.12,后者为4.15～7.86。试验还表明,大口鲇幼鱼亦摄食人工混合饲料,5cm左右便可用人工饲料进行驯化,但驯化过程要逐渐过渡,驯化期间生长速度受到影响,饲料系数亦较高。

Investigation and protection countermeasures of water environmental quality in Qiandao Lake

The paper deals with feeding and growth of domestication S. meridionalis Chen larvae under different kinds of food from July to August, 1992. Experiment shows that the larvae grew fast, especially by feeding platable life fishes. When life fishes were fed to larvae, their body weight increased 2. 67 - 4. 60 times as heavy as original weight for 21 days, 37. 9-84. 3% faster than those fed with fish meat. The larvae had defferent feeding habits in the morning and at night. The daily feeding amount per gram body weight lalvae was 0. 1- 0. 2g for life fishes and 0. 18-0. 29g for fish meat everyday. The former food coefficient was 2. 32-3. 12, and the later, 4. 15 - 7. 86. The results also show that the larvae fed artificial mixed feed, if only they were domesticated gradually by higher protein feed. Growth rate was affected during domestication, while food coefficient was higher too.