鱼类自然死亡率的估算及其影响因子的探讨

Estimating Natural Mortality from Stock Size and Catch Data

为探讨鱼类自然死亡率参数 ,文中讨论了 1种通过资源量和渔获量数据估算鱼类自然死亡率 (M)的方法。蒙特卡罗模拟分析显示当资源量的白色噪音 ,即变异系数 (CV)水平小于大约 10 %时自然死亡率的估计值基本上是准确的 ;捕捞死亡率的变化对自然死亡率估计的影响不大。文中构造了长寿命自然死亡率小和短寿命自然死亡率大的 2个鱼类种群 ,模拟结果表明这种方法更适用于寿命短而自然死亡率大的种群。另外该方法在黄海鱼 (Engraulisjaponicus)渔业数据上的应用同样得到了良好的结果。

This paper presents a method to calculate natural mortality (M) from stock size and catch data. Monte Carlo simulation analysis showed that when white noise sounds (CV) of stock size are less than about 10% the estimated natural mortalities are mostly reliable. The estimated natural mortality was not sensitive to fishing mortality. Two species, one being long-lived with low natural mortality and the othe short-lived with high natural mortality, were generated. The simulated results indicate that the method performed better for species with high Ms than those with low Ms. This method was also applied to the published data of the Yellow Sea anchovy (Engraulis japonicus) fishery and obtained viable results.