东海带鱼年龄与生长的研究

本文利用2002年12月～2004年8月在东海中北部(27°～34°N、126°E以西)所获取的带鱼渔获样品,共采集788ind,每月对带鱼矢耳石生长轮计测和带鱼样品基础生物学测定,研究带鱼年龄与生长之间的关系。结果表明,目前东海群系带鱼呈现出较以往任何时期低龄化和生长加快的渔业生物学特征;体重与肛长的关系性别间无明显差异;该群系的生长其性别间无显著差异,雌雄合并估算的vonBertalanffy生长参数L∞=493.3mm,K=0.346/yr,t0=-0.387yr。

Age and growth of Trichiurus haumela in the East China Sea

Based on the counts of the growth ring of sagittal otolith and the determination of the monthly basic biology of hairtail Trichiurus haumela specimens collected from the middle and north of the East China Sea (27°N～34°N、west of 126°E )during Dec.2002 to Aug.2004, the relationship between anus length and age of hairtail(a total of 778 specimens)was studied. The results showed that the growing trend towards lower ages and increase of growth rate of hairtail population in the East China Sea were more distinct than ever. The relation between weight and anus length was not significantly different between males and females, and the same was true of the growth of the population. von Bertalanffy growth parameters for the combined sexes were estimated as follows: asymptotic length (L_∞)=~493.3 mm, growth coefficient (K)=0.346/yr, and age at zero length (t_0)=-0.387yr.