闽南、台湾浅滩渔场二长棘鲷群体结构特征

The Population Structure of Parargyrops edita Tanaka in South Fujian and Taiwan Bank Fishing Ground

根据 1 998年 7月至 2 0 0 0年 6月闽南、台湾浅滩渔场二长棘鲷的生物学测定资料 ,本文主要研究其群体组成、生殖、摄食等特点 ,为合理开发利用和管理二长棘鲷资源提供科学依据。二长棘鲷周年叉长优势组为 1 1 0— 1 4 0mm ,占 5 8.9% ,体重优势组为 30— 70g ,占 6 4 .6 % ,平均叉长为 1 2 3mm ,平均体重为 5 5 .3g ;由 0—Ⅵ龄 7个年龄组所组成 ,以 0龄组占优势 ,平均年龄仅 0 .71龄 ,雌性性腺成熟度以Ⅱ期为主 ,其初次性成熟的叉长为 1 1 7mm ,生殖期为 1 2月至翌年 3月 ;周年均有摄食 ,各月摄食强度变化较大 ,平均摄食等级为 1 .4 6 ,平均摄食率为 88.8% ,摄食强度与叉长成显著的正相关。研究结果表明二长棘鲷种群结构趋于简单化、小型化。

According to the biological data of Parargyrops edita Tanaka in the South Fujian and Taiwan Bank Fishing Ground during July 1998 to June 2000,this paper studied population structure,spawning and feeding characteristics for reasonable utilization and management of this resource.The dominant fork length are 110-140mm,occupying 58.9%,the dominant body weight are 30-70g,occupying 64.6%.Its catch consists of 7 year-classes,from age 0 to age 6,the average age is merely 0.71.The fork length of mature individuals of female for the first time is 117mm.The spawning period is from December to March.The variety of feeding intensity is large,the average feeding intensity and feeding rate are 1.46and88.8% respectively,the positive correlation of feeding intensity and fork length is obvious.The result showed that the population of Parargyrops edita Tanaka is running to simplify,miniaturization and low aged.