Pacific chub mackerel (Scomber japonicus) is a relevant fishery resource shared among three countries in the northeastern Pacific. The spatiotemporal distribution of larvae has been related to the convergence of oceanographic mesoscale structures, which can generate considerable variability in the morphology of fish larvae. The main goal of this work was to describe the shape changes of larval S. japonicus and their relationship with oceanographic variability, through geometric morphometric analysis to assess the seasonal variability of 10 homologous landmarks distributed on the pre-anal section of 331 larvae from off the western coast of the Baja California Peninsula (WCBCP), Mexico (2006–2008). The results showed two principal morphotypes in Pacific chub mackerel larvae: The first morphotype had a more hydrodynamic body (longer and shallower head), influenced by increased sea surface flow and colder sea surface temperatures mainly during spring, and the second morphotype had robust larvae (shorter and deeper head) under slower current flow and warmer sea surface temperatures during winter and summer. We concluded that changes in larval body shape are influenced mainly by sea surface flow and sea temperatures, probably associated with the ability to reach higher swimming speeds during feeding success.

中文翻译：

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海洋条件对下加利福尼亚半岛西海岸鲭鱼体型变异性的影响

太平洋鲭鱼（Scomber japonicus）是东北太平洋三个国家共有的相关渔业资源。幼体的时空分布与海洋学中尺度结构的收敛有关，这可以在鱼类幼体的形态上产生相当大的变异性。这项工作的主要目的是描述幼虫S. japonicus的形状变化以及它们与海洋学变异的关系，通过几何形态计量分析评估分布在墨西哥下加利福尼亚半岛 (WCBCP) 西海岸 (WCBCP) 的 331 只幼虫肛门前段分布的 10 个同源地标的季节变异性 (2006-2008) . 结果表明太平洋鲭鱼幼虫有两种主要的形态类型：第一种形态类型具有更强的水动力体（头部较长和较浅），主要受春季海面流量增加和海面温度较低的影响，第二种形态类型具有强壮的幼虫。更短和更深的水头）在冬季和夏季较慢的电流流动和温暖的海面温度下。我们得出结论，幼体体型的变化主要受海面流量和海水温度的影响，