基于定置刺网的不同采样设计对三疣梭子蟹资源量估算的模拟分析  

Simulation analyses of abundance estimation of Portunus trituberculatus based on set gillnet for different sampling designs

作　　者：王迎宾 刘雅 赵静 WANG Yingbin;LIU Ya;ZHAO Jing(School of Fisheries,Zhejiang Ocean University,Zhoushan Zhejiang 316022,China)

机构地区：[1]浙江海洋大学水产学院,浙江舟山316022

出　　处：《海洋渔业》2022年第5期555-567,共13页Marine Fisheries

基　　金：浙江省基础公益研究计划(LGN21C190009);舟山市科技局项目(2022C41003)。

摘　　要：为了解定置刺网的不同采样设计对三疣梭子蟹(Portunus trituberculatus)资源量估算的影响,根据东海北部海域海流速度(v_(0))、三疣梭子蟹移动速度(v_(1))和定置刺网网列长度,提出了一种计算刺网拦截范围内三疣梭子蟹被捕获概率的方法。基于该方法,模拟了定点采样、简单随机采样、分层定点采样和分层随机采样4种采样调查方法,采样站位数量16和25个,网片数量50列、80列和150列以及4个季节共72种组合的情况,每种情况重复1000次。结果表明:定置刺网网列数量越多,越容易对三疣梭子蟹资源量产生低估;定点采样方法中,采样站位数量越多,模拟结果越准确;随机采样方法的调查结果受采样站位数量的影响相对较小;分层采样效果优于不分层采样。资源密度越低、海流速度越大,模拟调查结果越好;三疣梭子蟹具有季节性时空分布的特征,冬季资源密度低且分布较其他季节更为均匀,模拟结果较其他季节更准确。The set gillnet has the characteristics of low cost,high selectivity,being easy to use,clean and environment friendly.It is one of the important fishing gears for fishing Portunus trituberculatus in the East China Sea.It is also the main operation method in the pilot waters of Zhejiang Province’s quota fishing management system.In addition,set gillnet is also used for fishery resource monitoring and estimation of fishery resources.Based on the catch of set gillnet,scientific and reasonable assessment of P.trituberculatus resources can not only reduce the cost of assessment,but also be a useful supplement to the investigation of conventional bottom trawl resources.In order to investigate the effects of different sampling designs of set gillnet on resource estimation of Portunus trituberculatus,an algorithm model is created to estimate the capture probability by different current speeds,moving speed of crab and net length.Based on this algorithm,four sampling survey methods including fixed station sampling,simple random sampling,stratified fixed station sampling and stratified random sampling are simulated.Considering the number of sampling stations of 16 and 25,four seasons,50,80 and 150 columns of set gillnet,a total of 72 sets of simulation experiments are performed.The python programming language is used to repeat simulation calculations for each set of experiments 1000 times.The results are as following:1)In terms of sampling method,fixed station sampling with the increase of the number of set gillnet,the REE and RB values gradually decrease.In the random sampling scheme,the REE and RB values change in a smaller range.When the number of gillnets and the number of sampling stations are the same,the effect of stratified sampling is better than that of non-stratified sampling,and stratified random sampling has the best effect in this resource evaluation simulation experiment;lower resource density and higher ocean current speed make the REE value relatively small,and result in better results.In the case of a ce

关 键 词：蟹类 东海北部 站位数量 资源评估 

分 类 号：S931[农业科学—渔业资源]