东海带鱼种群鉴别研究

POPULATION IDENTIFICATION OF THE TRICHIURUS HAUMELA FROM THE EAST CHINA SEA

通过对取样于东海不同海区29批2168属带鱼鱼体的各项形态性状的观察、计测，并应用数学方法对性状差异进行统计比较和群体间聚类分析，结合有关资料进行综合分析。结果表明：东海带鱼，不论近海或外海的群体，相互间形态特征基本酷似，呈现出密切的关系，从而确认它们系同一个种群，在渔业生物学研究和资源管理上当作一个基本单元。东海南部外海（北纬29°以南、东经125°30′以东）的带鱼群体，其形态性状虽与其它海区相比存在一定的地理性差异，但差异值界限不甚明显，可能是东海带鱼同一个种群内的一支独立群体。

Populations and stocks of hairtail (Trichiurus haumela) were indehfied with samples collected from 29 locations (of which 14 were located in the off-see area and 15 in the inshore area repeetively) in the East China Sea during the period from 1991 to 1993. 10 morphometrical and meristical characters were measured for being used in the coefficient of difference, comparative analysis of Mdiff and cluster analysis. The results showed that there was no significant difference between the samples from the inshore area and off sea area, it can be considered that the sampled hairtils were fiom a same population. Although there was some geographical variations between the stock of the off sea area in the south of East China Sea (south of 29°N, east of 125°30′E) and the stock of other areas, but the demarcation line of this variability was not very distinct, so it was possible that the stock of the off sea area in the south of East China Sea was independent.