We examined the distribution and genetic variability of the greater amberjack Seriola dumerili in the East China Sea (ECS) from the mitochondrial DNA (mtDNA) control region of young-of-the-year (YOY) individuals, which may reflect the genetic characteristics of the spawning population. In the years 2016 and 2017, a total of 165 YOY S. dumerili were collected from two different locations in the ECS: the southern part of the ECS, and western Japanese coast. The spawning period was estimated using otolith daily increments from a total of 67 larvae and juveniles collected in the ECS. Results from size and age distribution indicated that S. dumerili spawned near the shelf break region in the southern ECS from January to April. Phylogenetic analysis based on mtDNA sequence data showed no significant genetic differentiation among samples collected from different locations, implying S. dumerili in the ECS is mainly composed of one population. S. dumerili around the Japanese coast may be originated from the southern ECS.

中文翻译：

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东海大鰤（Seriola dumerili）的分布及遗传变异

我们从年幼 (YOY) 个体的线粒体 DNA (mtDNA) 控制区域检查了东海 (ECS) 中大鰤的分布和遗传变异性，这可能反映了产卵种群。在 2016 年和 2017 年，共从 ECS 的两个不同位置收集了 165 YOY S. dumerili：ECS 南部和日本西部海岸。使用从 ECS 中收集的总共 67 只幼虫和幼虫每天增加的耳石估计产卵期。大小和年龄分布结果表明，S. dumerili 于 1 月至 4 月在 ECS 南部的陆架断裂区附近产卵。基于 mtDNA 序列数据的系统发育分析表明，从不同地点收集的样本之间没有显着的遗传差异，这意味着 ECS 中的 S. dumerili 主要由一个种群组成。日本海岸附近的 S. dumerili 可能起源于南欧。