网箱养草鱼大都为三年生产周期,即第一年培育冬片鱼种。10—16.5cm,第二年培育二龄鱼种,200—350克,第三年养成商品鱼,2—3公斤。培育二龄鱼种作为网箱养草鱼承前启后的一环,其鱼种放养成功与否,直接影响当年鱼种成活率,年终起水规格、鱼群生长倍数。笔者经过两年育种实践,总结如下: 1.严格把握放养时间鱼种放养一般选择在三月份,水温气温基本平衡在12—14℃进行。鱼种经并箱越冬后,体质瘦弱,分箱后饲喂适口性强的柔嫩黑麦草,莴苣叶,糠饼等补充能量,恢复体质。若分箱太迟,水温达到16℃以上,既不利于鱼种密集,过筛等各种操作,又 Cages fish mostly for three years of production cycle, that is, the first year of cultivation of winter species. 10-16.5cm, the second year to cultivate second-year fish species, 200-350 grams, the third year to develop commercial fish, 2-3 kg. Breeding second-age species of fish as cage fish grassland before and after the opening and closing of the success of its stocking or not, a direct impact on the survival rate of fish species, end of the year starting specifications, fish growth multiple. The author after two years of breeding practice, summarized as follows: 1. Strict control of stocking time stocking stocking general choice In March, the water temperature basic balance at 12-14 ℃. Fish species after cocooning over the winter, the constitution is emaciated, after feeding mellow palatability tender rye grass, lettuce leaves, bran cakes and other supplementary energy to restore physical fitness. If the bin too late, the water temperature reached above 16 ℃, neither conducive to species intensive, sifting and other operations, and