尖吻鲈苗种工厂化培育模式的初步研究

A Study on the Industrial Cultivating Pattern of Larva and Fry of Sea Bass, Lates calcarifer(Bloch),in Concrete Tank

采用室内水泥池及活饵培育配套技术进行尖吻鲈苗种阶段工厂化育苗。投放刚孵化出膜的仔鱼１６０万尾，经室内池８ｄ的培育，成活率为９０％；经１３ｄ的培育其规格超过１ｃｍ，成活率为５６．９％；经２４ｄ的培育平均规格达２ｃｍ左右，平均成活率为５０％，共育出８０万尾。苗种生长快，体质健壮，成活率高。关键技术是：基础设施配套；采用不同活饵，做到适口、及时转化、足量；定期过筛分级培育；水质控制良好；注意防病。２ｃｍ以上鱼种阶段采用多种方式培育，经１５～２０ｄ的饲养，规格达３～４ｃｍ，平均成活率为６５％～７５％。

The culturing model of larva and fry of sea bass, Lates calcarifer (Bloch), in concretetank is dealt with in this paper. 1. 6 million larvae just after hatching can survive 90% bybreeding 8 d in the tanks. The size (total body length, TL) exceeded 1 cm (surviving 56. 9%)after 13 days'rearing. And the average size reached 2 cm (surviving 50%)after 24 days' rearing,the amount totaling 0. 8 million. The larva and fry grew fast, healthily and strongly, and gottenhigh survival rate with this breeding model. So the key techniques are required as follows, thefoundation facilities must be perfect; Various alive food should be agreeable to the taste,changeabe in time and quantity; The fish larva should be reared after selecting with fish screenperiodically; Mean while water quality must be kept clean and moderate to prevent the larva fromcatching disease. Varieties of cultivating methods (netcage, pond and tank) are utilized when thelength would be 2 cm. By breeding 15 ~ 20 d, the size of fingerlings achieved 3 ~ 4 cm, theaverage survival rates would be 65% ~75 %.