Understanding the extent and distribution of population structure and genetic connectivity of fisheries targets are crucial for informing management. This study uses population genomics to examine patterns of genetic structure of the market squid (Doryteuthis opalescens), one of the most important commercially harvested species in California. Data from 662 single nucleotide polymorphism (SNP) loci from a total of 149 individuals representing five monthly sampling groups (May–September 2014) in the Northern (Monterey) and Southern (Southern California) regions of the fishery (n = 8) revealed no significant genetic differentiation between regions (FST = 0.008, p > 0.05, FCT = − 0.006, p > 0.05). However, discriminant analysis of principal components and pairwise comparisons of genetic differentiation revealed unexpected complex patterns of fine-scale population structure over time. These results suggest the existence of smaller potentially genetically varied micro-cohorts that continually spawn in California, as opposed to the prevailing notion that spawning occurs in two asynchronous peaks in the Northern and Southern regions of the fishery, with important implications for fisheries management.

了解人口结构的范围和分布以及渔业目标的遗传连通性对信息管理至关重要。这项研究使用种群基因组学来研究市场鱿鱼的遗传结构模式（Doryteuthis opalescens），这是加利福尼亚州最重要的商业性采集物种之一。来自北部（蒙特雷）和南部（南加利福尼亚）地区（n = 8）的五个月度采样组（2014年5月至9月）的总共149个个体的662个单核苷酸多态性（SNP）位点的数据显示，没有区域之间的显着遗传分化（FST = 0.008，p> 0.05，FCT = − 0.006，p> 0.05）。然而，判别分析的主要成分和成对的成对比较显示随着时间的推移出现了意想不到的复杂的小规模种群结构模式。这些结果表明，在加利福尼亚州不断产生的规模较小，具有潜在遗传差异的微型队列存在，