【摘要】 根据1957～2001年对东海带鱼的生物学测定和调查监测资料,对东海带鱼群体结构、繁殖特性、生长等变化进行了研究。结果表明:随着捕捞强度的增大,带鱼群体结构发生了变化。特别从80年代以来,带鱼群体组成出现明显的小型化、低龄化趋势,带鱼年龄组成序列缩短,渔获带鱼最高年龄组由7～8龄缩短为90年代的4～5龄,带鱼个体生殖力进一步提高,带鱼各龄组的平均肛长进一步缩小,而且带鱼有性成熟提早和产卵时间延长的趋势。更多还原

【Abstract】 The variation of stock structure,propagation habit and growth of hairtail,Trichiurus haumela in the East China Sea was studied,based on the biological measures and investigation and monitoring data from the year of 1957～2001.The results showed that the stock structure of hailtail has varied with fishing intensity in-creasing,and that especially the stock composition of hailtail has appearred a typical tendencys of small size and low age since1980s.The highest age -group of catch was only4～5in1990s while it was7～8before1990s.The reproductivity of individual has further increased and the average body length of each age -group has further reduced.And the body length of a first -matured fish was smaller and spawning period was longer than that of before.更多还原