南海北部带鱼生长死亡与参数动态综合模式
Growth and mortality of hairtails and their dynamic pool models in the northern South China Sea
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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.Abstract: On the basis of taxonomy of genus Trichiurus and length frequency data collected by traw l 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 estim ated with ELEFANⅠ in von Bert alanffy 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 speciesest imated 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.
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Key words:
- Trichiurus /
- growth /
- mortality /
- dynamic pool model /
- northern South China Sea
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