论文部分内容阅读
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。
In order to explore the natural mortality parameters of fish, a method for estimating natural mortality of fish (M) based on resource and catch data is discussed. Monte Carlo simulations showed that estimates of natural mortality were essentially accurate when the white noise of the resource, ie, the coefficient of variation (CV) level, was less than about 10%; the effect of changes in fishing mortality on natural mortality estimates was not Big. In this paper, two fish populations with long-lived natural mortality and short-lived natural mortality are constructed. The simulation results show that this method is more suitable for short-lived and natural-mortality populations. In addition, the application of this method to the fishery data of Engraulis japonicus also obtained good results.