摘要
设计了新型卵形鲳鲹鱼种中间培育模式,并通过试验确定了各级培育主要技术参数。该模式共分3个培育阶段,初始放养鱼种规格为2.9 cm≤体长≤3.2 cm。一级、二级和三级培育密度分别为280~300 ind·m-3水体、150~180 ind·m-3水体和120~150 ind·m-3水体;培育网衣网目分别为2a=1.2,2.0和3.0 cm。各级培育具体苗种筛分细则为:一级培育中,当体长≥4.4 cm鱼种数量占总数的(40±2)%时进行分筛,体长≥4.4 cm的鱼种进入二级培育;二级培育中,当体长≥5.8 cm的鱼种数量占总数的(90±2)%时进行分筛,体长≥5.8 cm的鱼种进入三级培育;三级培育中,当体长≥7.2 cm的鱼种数量占总数的(90±2)%时进行分筛,体长≥7.2 cm的鱼种进入成鱼养殖。通过该模式,鱼种培育成活率及7.2 cm≤体长≤8.2 cm鱼种的集中度超过85%。与传统培育模式相比,成活率可提高10%以上,有效降低了养殖成本;同时,可大幅提升商品鱼品质,增加养殖效益。
A new model for intermediate culture of Trachinotus ovatus fingerlings in large cage was designed,and the main technical parameters were determined by experiment. This culture model included three stages of culture:primary,secondary and tertiary,and the initial size of Trachinotus ovatus fingerlings were 2. 9-3. 2 cm. For the primary,secondary and tertiary culture the stocking densities were 280-300 ind·m-3,150-180 ind·m-3 and120-150 ind·m-3,respectively,and the net mesh size was 2 a = 1. 2 cm,2. 0 cm and 3. 0 cm,respectively.The fingerlings were selected by sieving for the secondary culture when they were 4. 4 cm or more long and accounted for( 40 ± 2) % of the total. Likewise,the fingerlings of 5. 8 cm or more were sieved and selected for tertiary culture when they were( 90 ± 2) % of the total. The fingerlings were sieved for adult fish culture when they were7. 2 cm or more long and made up( 90 ± 2) % of the total. When cultured in this model,the fingerlings had a survival rate of more than 85%,and the number of fingerlings with the body length between 7. 2 cm and 8. 2 cm accounted for more than 85%. Compared with the traditional culture,this culture model had a higher survival rate by above 10%,reducing the production cost effectively and increasing the profit.
出处
《热带生物学报》
2017年第4期383-389,共7页
Journal of Tropical Biology
基金
海南省重大科技项目(ZDKJ2016011)
关键词
卵形鲳鲹
鱼种
中间培育
成活率
体长集中度
Trachinotu ovatus
fingerlings
survival rate
stepwise intermediate culture
length concentration ratio
