Direct estimation of stock abundance of Pacific saury Cololabis saira in the northwestern Pacific Ocean using a mid-water trawl
Direct estimation of stock abundance of Pacific saury Cololabis saira in the northwestern Pacific Ocean using a mid-water trawl
复制标题
利用中层拖网直接估算西北太平洋秋刀鱼 Cololabis saira 的种群丰度
DOI：
10.1007/s12562-016-1044-2
复制
发表时间：
2016
影响因子：
1.9
通讯作者：
Y. Kurita
中科院分区：
文献类型：
--
作者：
Y. Ueno;S. Suyama;Masayasu Nakagami;M. Naya;M. Sakai;Y. Kurita
长期以来，流刺网一直是调查太平洋刀鱼分布的主要研究工具。然而，事实证明，由于缺乏对这些刺网扫过的调查区域的了解，使用漂流刺网难以估计秋刀鱼的绝对丰度。中层拖网种群丰度估计的优点是能够在商业捕鱼季节开始之前估计绝对种群丰度，而根据商业渔业单位努力量渔获量的传统种群丰度估计必须在商业捕鱼季节结束之后进行。为了确认实用的中层水拖网估计秋刀鱼的股票丰富，我们进行了比较调查，在西北太平洋使用中层水拖网和漂流刺网。我们发现，中层拖网和流网的单位努力渔获量的地理分布模式是相似的。使用区域扫掠法和在以前的研究中获得的中层水拖网捕捞效率的数据，我们能够估计研究区域内的种群丰度加置信限。我们的研究结果表明，由中层水拖网取样的秋刀鱼的大小组成可以被认为是近似的实际大小组成的秋刀鱼。
Drifting gill-nets were for a long time the main research gear for investigating the distribution of Pacific sauryCololabis saira. However, it has proven to be difficult to estimate the absolute abundance of saury using drifting gill-nets due to a lack of knowledge on the survey areas swept by these gill-nets. A mid-water trawl stock abundance estimation has the advantage of being able to estimate the absolute stock abundance before the commercial fishing season begins, whereas the conventional stock abundance estimation based on catch per unit efforts of commercial fisheries must be done after the commercial fishing season has ended. To confirm the practicality of a mid-water trawl to estimate the stock abundance of saury, we conducted a comparative survey in the northwestern Pacific Ocean using both a mid-water trawl and drifting gill-nets. We found that the geographic distribution pattern of catch per unit effort for both the mid-water trawl and driftnets was similar. Using the area-swept method and data on the fishing efficiency of the mid-water trawl obtained in a previous study, we were able to estimate the stock abundance plus confidence limits within the research areas. Our results suggest that the size composition of saury sampled by the mid-water trawl can be considered to approximate the actual size composition of saury.