生产监测船数量的优化——通过不同地区各物种产量计算

Optimization of the Number of Production Monitoring Vessels—Calculated by the Yield of Each Species in Different Regions

对不同作业类型的监测船进行分层抽样调查,可以在兼顾监测信息精度的前提下减少大量成本。以带鱼等9种经济物种的单船全年产量及总产量作为渔业生产监测目标,并以相对估计误差(REE)作为评价指标,分析并优化渔业生产监测船数量对渔业生产监测目标估计的影响。将浙江省舟山市等4个重要渔业地市作为个体,通过计算机软件在每个个体内进行基于作业方式的分层抽样。研究表明:(1)各地区中各物种的单船产量及总产量的REE均值均随着监测船数量的增加而下降,当监测船数量增加至一定数量后下降的幅度减缓。(2)在监测船优化过程中出现目标物种产量及总产量的REE均值下降幅度较大现象。通过分析各目标物种的产量与总产量的REE均值与监测船数量的关系,将浙江省4个地区监测船数由240优化至145,此时监测船数减少了39.58%,且各目标物种的总产量REE均值上升均不超过10%。不同作业方式对REE值的影响不同,可以增加影响较大的作业方式渔船数保证监测数据准确,减少影响较小的作业方式渔船数降低监测成本。本研究的优化过程可重复性强,对改进海洋捕捞生产统计方法具有重要意义。

The stratified sampling survey for monitoring vessels of different operation types can reduce a lot of costs while taking into account the accuracy of monitoring information.In this study,the annual output and total outputof a single ship of nine economic species,such as Trichiurus lepturus,are taken as the monitoring target of fishery production,and the relative estimation error(REE)is taken as the evaluation index to analyze and optimize the impact of the number of fishery production monitoring ships on the estimation of the monitoring target of fishery production.Taking Zhoushan city and other four important fishery cities in Zhejiang province as individuals,stratified sampling based on operation mode was conducted in each individual through computer software.The research shows that:(1)The average REE of the single vessel yield and total yield of each species in each region decreases with the increase of the number of monitoring vessels,and the decline slows down when the number of monitoring vessels increases to a certain number.(2)In the process of monitoring ship optimization,the mean REE of target species yield and total yield decreased significantly.By analyzing the relationship between the average REE value of the yield and total yield of each target species and the number of monitoring vessels,the number of monitoring vessels in four regions of Zhejiang province was optimized from 240 to 145.At this time,the number of monitoring vessels decreased by 39.58%,and the average REE value of the total yield of each target species increased by no more than 10%.Different operation modes have different effects on the REE value.It can increase the number of fishing vessels in the operation mode with greater impact to ensure accurate monitoring data,and reduce the number of fishing vessels in the operation mode with less impact to reduce monitoring costs.The optimization process of this study is highly repeatable,which is of great significance for improving the statistical method of marine fishing production.