摘要
根据我国近海带鱼分种研究结果,利用南海北部底拖网调查收集的带鱼属3鱼种的生物学资料,运用长度频率法估算了3鱼种的生长和死亡参数.带鱼、南海带鱼和短带鱼von Bertalanffy生长方程的渐近肛长分别为70.0,54.5和48.0 cm;生长系数分别为0.27,0.27和0.17;理论生长起点年龄分别为-0.60,-0.68和-1.10龄.用长度变换渔获曲线法估算的3鱼种总死亡系数分别为3.02,0.80和2.43;用经验公式估算的自然死亡系数分别为0.39,0.58和0.44;捕捞死亡系数分别为2.63,0.22和1.99.动态综合模式的分析结果表明,3鱼种都能承受较大的捕捞压力,资源利用的不合理之处是大量捕捞1龄以内的幼鱼;在最适利用状态下,带鱼、南海带鱼和短带鱼的开捕年龄分别应为3.0,2.0和2.7龄,对应的肛长分别为44,28和23 cm.
On the basis of taxonomy of genus Trichiurus and length-frequency data collected by trawl survey in the northern South China Sea, growth and mortality parameters for three species of Trichiurus were estimated. For T. haumela, T. nanhaiensis and T. brevis, the asymptotic anus lengths estimated with ELEFAN I in von Bertalanffy growth function were separately 70. 0, 54. 5 and 48. 0 cm, growth rates 0. 27, 0.27 and 0. 17, and initial condition parameter was -0. 60, -0. 68 and -1.10 a. Total mortality coefficients for the three species estimated by length-converted catch curves were 3. 02, 0. 80 and 2. 43, natural mortality coefficients by the Pauly empirical formula 0. 39, 0. 58 and 0. 44, and fishing mortality coefficients 2. 63, 0. 22 and 1. 99 respectively. Dynamic pool models indicated that exploitation of the stocks was unrational due to catches of large proportions of 0-age-group juveniles, although the stocks could sustain high fishing pressure. It is suggested that, for T. haumela, T. nanhaiensis and T. brevis, the ages at the first capture is increased to 3. 0 ages （44 cm in anus length）, 2. 0 ages （28 cm in anus length） and 2. 7 ages （23 cm in anus length） respectively.
出处
《海洋学报》
CAS
CSCD
北大核心
2005年第6期93-99,共7页
基金
国家海洋勘测专项南海区渔业资源调查资助项目
关键词
带鱼属
生长
死亡
动态综合模式
南海北部
Trichiurus
growth
mortality
dynamic pool model
northern South China Sea
