Spatiotemporal variability in the occurrence of juvenile Japanese jack mackerel Trachurus japonicus along coastal areas of the Kuroshio Current
Spatiotemporal variability in the occurrence of juvenile Japanese jack mackerel Trachurus japonicus along coastal areas of the Kuroshio Current
复制标题
黑潮沿岸地区日本竹荚鱼幼鱼 Trachurus japonicus 发生的时空变化
DOI：
10.1111/fog.12538
复制
发表时间：
2021
影响因子：
2.6
通讯作者：
Itoh Sachihiko
中科院分区：
文献类型：
--
作者：
Ishikawa Kazuo;Watanabe Chikako;Kameda Takahiko;Tokeshi Tsutomu;Horie Hikari;Hashida Daisuke;Ookawa Toshiyuki;Takeda Takashi;Kuno Masahiro;Suzuki Yuki;Takamura Shozo;Fukumoto Ryousuke;Itoh Sachihiko
了解黑潮沿岸日本竹荚鱼的种群结构（简称“CAK”），我们分析了这些地区2005- 2015年期间幼鱼的大小组成和商业登陆数据。产卵区和幼鱼/成鱼栖息地之间的连通性很重要。因此，我们的主要目的是评估在一些分区登陆的幼鱼的来源，包括1月至5月在CAK西部的本地产卵场（w-CAK），5月至7月在东部（e-CAK）产卵的幼鱼，以及2月至3月在东海南部的偏远产卵场（s-ECS）产卵的幼鱼。在CAK中，通常观察到春季开始的捕捞期（春季开始），这涉及相对较小的规模类别（50-100毫米叉长[FL]）。基于日本赤眼蜂生长速率的后向估计表明，来自s-ECS的贡献可能主导了4月至6月的大部分春季爆发，因为最小的尺寸级（50-70 mm FL）几乎只发生在4月至5月。在秋季，发病信号与着陆的青少年从当地产卵场在东部分区的e-CAK。尽管北梭子蟹栖息地之间的运输和迁移流量不对称，但由于本地和远程产卵场在不同季节的使用，其种群水平可能会持续。
To understand the population structure of the Japanese jack mackerelTrachurus japonicusin coastal areas adjacent to the Kuroshio Current (referred to as the “CAK”), we analyzed size composition and commercial landing data of juvenile fish in these areas for the period 2005–2015.Trachurus japonicusdoes not undergo population‐scale spawning migration, and thus, the connectivity between the spawning and juvenile/adult habitat areas is important. Therefore, our primary aim was to assess the origin of juveniles landed in a number of subareas, including those spawned in local spawning grounds in January–May in the western part of the CAK (w‐CAK), those spawned in May–July in the eastern part (e‐CAK), and those spawned in February–March in the remote spawning ground in the southern East China Sea (s‐ECS). Fishing periods starting in spring (spring onset) were commonly observed in the CAK, which involved relatively small size classes (50–100 mm fork length [FL]). Back estimates based on the growth rate ofT.japonicussuggested that the contributions from the s‐ECS probably dominated most of the spring onsets in April–June because the smallest size class (50–70 mm FL) occurred almost exclusively in April–May. In autumn, onset signals were associated with the landing of juveniles from the local spawning ground in an eastern subarea of the e‐CAK. Despite the asymmetric transport and migration flows between the habitat areas ofT.japonicus, its population levels may be sustained because the local and remote spawning grounds are used in different seasons.