摘要
根据1986-2000年对东海和南黄海渔获带鱼的生物学基础调查,利用世代分析方法计算了东海带鱼的资源数量,分析了东海带鱼生殖和补充特征的变动状况,同时研究了环境与带鱼补充量变动的关系。结果表明,随着捕捞压力的增大,东海带鱼的最小成熟体长、产卵亲体的平均体长、平均体重组成进一步缩小,个体繁殖力提高而卵径变小;实行伏季休渔后,东海带鱼的补充群体数量大幅度增加,单位亲体的补充量比伏休前增加45%～60%,证明了伏季休渔的生态效益;带鱼补充群体数量与亲体数量、海中温度、伏休时间成正比。目前东海带鱼的亲体数量仍显不足,应进一步减少对带鱼的捕捞强度。
Based on the basic biological survey on captured hairtail,Trichiurus haumela in the East China Sea and the Southern Yellow Sea from 1986 to 2000, the hairtail resource in the East China Sea was assessed by using generation analysis and the variation of its productivity and recruitment was discussed. A relationship between environment and recruitment was given through selected environmental factors. Results showed that the minimum body length of maturation, the average body length and the body weight of spawning parents declined, so did the egg diameter; while individual productivity increased, with the ever-developing fishing power. After the implementation of Summer No-Fishing Season system, the quantity of recruiting colony increased a lot, and the recruiting quantity per unit of parents increased by 45%-60%. That clinched that the Summer No-Fishing Season system had a very good ecological effects. The recruiting quantity was directly proportional to the number of parents, water temperature and most importantly the period of the season. The parent fish in the East China Sea is still insufficient, so it is imperative to further decease fishing power.
出处
《水产学报》
CAS
CSCD
北大核心
2003年第4期322-327,共6页
Journal of Fisheries of China
基金
国家重点基础研究发展规划项目(G1999043711)
浙江省科技计划项目(961102204)
