摘要
根据 1 997～ 1 999年期间在南海北部海域采集的金线鱼生物学资料 ,应用 Fi SAT 软件进行金线鱼的生长和死亡参数估算。用 EL EFAN 技术拟合的 von Bertalanffy生长方程参数分别为L∞ =33.0 8cm ,k=0 .30 a-1 及 t0 =- 0 .86 a,用 Pauly经验公式计算的自然死亡系数为 M=0 .6 8,以长度变换渔获曲线法估算陆架区和北部湾的总死亡系数分别为 2 .0 7和 2 .0 2。运用 Beverton- Holt模型分析的结果表明 ,该群体的最适捕捞死亡系数为 F=2 .4 ,最适开捕年龄和体长分别为 1 .8a和 1 6 .5cm。研究表明 ,目前该群体已处捕捞过度状态 ,尤以捕捞幼鱼的问题较为突出。为可持续利用金线鱼资源 ,建议南海北部金线鱼的最小可捕规格应为体长 1 6 .5 cm。
Based on biological data of threadfin bream Nemipterus virgatus (Houttuyn) collected in northern South China Sea during 1997～1999, the growth and mortality parameters of stock were estimated using the FiSATⅡpackage. The growth parameters in the von Bertalanffy formula estimated with ELEFANⅠwere L ∞=33.08cm (body length), k=0.30a -1, and t 0=-0.86a respectively. The natural mortality calculated with Pauly's empirical equation was M=0.68. The total mortality on the continental shelf and in Beibu bay estimated using the length-converted catch curve was Z=2.07 and 2.02. The results of assessment using the Beverton-Holt model indicated that the optimum catchable age and the optimum body length was 1.8a and 16.5cm. The stock has been over exploited mainly due to capture of under-size juvenile fish. It is suggested that the legal body length at first capture of threadfin bream in the northern South China Sea should be 16.5cm.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第2期224-230,共7页
Periodical of Ocean University of China
基金
南海北部主要经济鱼类渔业生物学样品分析资助
关键词
金线鱼
生物学
ELEF
AN
拟合
生长方程参数
最适开捕体长
Nemipterus virgatus
growth
mortality
optimum catchable size
ELEFAN technique
northern South China Sea
