一龄鳜鱼种培育试验

Experiment on Rearing Yearling Fingerlings of Mandarin Fish

为满足规模化养鳜对大规格鱼种的需求，进行了一龄级培育试验。在2个1．2亩的池塘里放养夏花皈鱼种8400尾，培育92天，结果育成平均规格68．5g／尾的一龄鳜鱼种493．2kg，成活率90％。试验中，利用4．8亩饵料鱼培育地，按级体重12％的投喂量，每4～5天投喂一次规格为鳜体长50～60％的饵料鱼，并每亩用250～300g开水浸泡中草药制剂“敌鱼虫”，杀灭锚头鳋，效果较好。试验认为，同池饲养的鱼种规格应尽可能一致，在“暴长”期应及时增加投饵量。

The purpose of the experiment on rearing yearlings fingerlings of the mandarin fish is to meet the need of the big-sized fingerlings for the mandarin fish culture on a large scale. 8400 summer fingerlings of the mandarin fish were stocked into two ponds (the area of each one is 1. 2 mu ) nursing 92 days. 493.2 kg of the big-sized mandarin fish fingerlings with the average size of 68.5 g/ind. were harvested. The survival rate was 9O%. In the experiment the fingerlings or the mandarin fish were fed on the fry or fingerlings of other kinds of fishes cultured in the nursery pond with the ares of 4.8 mu. The feeding dose accounts for 12 % of the body weight of the mandarin fish. Every4～5 days the feed-fish (body length of 50～6O % shorter than that of the mardarin fish)was fed to the mandarin fish. It has a good effect to kill the Lernaea with the “anti-fish disease”made of the Chinese herbal medicine soaked in the boiling water of 250～300g per mu. The experiment proved the size of the mandarin fish fingerlings cultured in the same pond is as good as uniform,and in the fast growing period the feeding dose should be increased in time.