Comparison of biomass estimates from multiple stratification approaches in a swept area method for Pacific saury Cololabis saira in the western North Pacific
Comparison of biomass estimates from multiple stratification approaches in a swept area method for Pacific saury Cololabis saira in the western North Pacific
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北太平洋西部太平洋秋刀鱼 Cololabis saira 扫掠面积法中多种分层方法生物量估计值的比较
DOI：
10.1007/s12562-020-01407-3
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发表时间：
2020
影响因子：
1.9
通讯作者：
Yasuhiro Ueno and Toshihide Kitakado
中科院分区：
文献类型：
--
作者：
Hashimoto;Midori;Hideaki Kidokoro;Satoshi Suyama;Taiki Fuji;Hiroomi Miyamoto;Miyako Naya;Dharmamony Vijai;Yasuhiro Ueno and Toshihide Kitakado
自2003年以来，在北太平洋西部使用海面拖网对太平洋蜥蜴进行的渔业独立调查，使研究人员能够在日本主要捕鱼季节之前的6月和7月对它们的年度分布模式和总生物量进行调查。我们比较了在扫面积法中基于五种不同分层后方法得出的生物量估计值及其相关方差，然后观察到由于组织良好的调查设计和均匀分配的采样站，这些方法对生物量估计值及其精度的影响很小。我们能够利用15年的减少生物量估计值作为正在进行的种群评估的基本丰度指数。基于分层和纵向调查线的检验表明，西部调查区估算生物量减少，导致2010年后太平洋刀鱼分布重心向东移动。我们建议在纵向分层的基础上进行东西方向的生物量估算，以建立反映向西迁移到日本沿海水域渔场的种群动态模型，并预测随后渔场期间的预期捕获量。
Fishery-independent surveys using sea surface trawl nets for Pacific sauryCololabis sairain the western North Pacific since 2003 have enabled the investigation of their annual distribution patterns and total biomass during June and July, prior to the main fishing season in Japan. We compared biomass estimates and their associated variances derived based on five different post-stratification approaches in a swept area method, and then observed that these approaches have little effect on biomass estimates and their precision, owing to well-organized survey designs and homogeneously allocated sampling stations. We were able to utilize decreasing biomass estimates for 15 years as an essential abundance index in the ongoing stock assessment. Notably, examination based on stratification along with longitudinal survey lines indicated that the estimated biomass had decreased in the western survey area, resulting in an eastward shift in the gravity center of Pacific saury distribution after 2010. We recommend biomass estimation in an east–west direction based on longitudinal stratification as an effective measure to develop population dynamics models which reflect westward migration into the fishing grounds around Japanese coastal waters, and to forecast the expected catch during the subsequent fishing period.
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