Global commercial catches of squid have increased greatly in the last few years. However, approximately a quarter of the squid catches are still unidentified. In the southeastern Gulf of Mexico (SGoM), the squid catches are not recorded most of the time and are unidentified. This lack of knowledge limits the evaluation of the populations and prevents the establishment of conservation strategies. In this study, we used morphological and molecular (DNA barcoding– cytochrome c oxidase subunit I gene) identification tools to analyze the species composition of the family Loliginidae based on their paralarvae (PL), their abundance distribution by size class, and their genetic structure on the Yucatan Shelf, SGoM. A total of 134 PL were also collected from three oceanographic cruises held in 2015, 2016, and 2018. A total of 56 adults were collected from three ports of Yucatan. Both adults and PL were identified as Doryteuthis pleii (Blainville, 1823). The highest abundances of PL were detected from the West and the Central zones of the Yucatan Shelf at 50- and 15-m depth isobaths at 163 and 21 km from the coastline, respectively. The abundance was higher (316 PL•1,000 m^-3) in the early summer (June 2018), medium (213 PL•1,000 m^-3) at the end of summer and early autumn, and very low (24 PL•1,000 m^-3) in late autumn. A high haplotype and nucleotide diversity (Hd= 0.77; π= 0.002) with no structured population (F_st < 0) was also found, suggesting a continuous gene flow throughout the Yucatan Shelf. This information establishes the basis for a future comprehensive understanding of their biological cycle and population dynamics.

过去几年，全球鱿鱼的商业捕捞量大幅增加。然而，大约四分之一的鱿鱼捕获量仍未确定。在墨西哥湾东南部 (SGoM)，鱿鱼捕捞量大部分时间没有记录，而且身份不明。这种知识的缺乏限制了对种群的评估并阻碍了保护策略的制定。在这项研究中，我们使用形态学和分子（DNA 条形码-细胞色素 c 氧化酶亚基 I 基因）鉴定工具，根据其副幼虫 (PL)、按大小类别的丰度分布及其遗传结构分析了罗氏科的物种组成。在 SGoM 的尤卡坦大陆架上。从 2015 年、2016 年和 2018 年举行的三场海洋巡游中还收集了 134 艘 PL。从尤卡坦的三个港口共收集了 56 名成年人。成人和 PL 都被确定为鲟鱼（布兰维尔，1823 年）。在距离海岸线 163 公里和 21 公里处的 50 米和 15 米等深线处，分别在尤卡坦大陆架的西部和中部地区检测到 PL 的最高丰度。丰度在初夏（2018年6月）较高（316 PL•1,000 m ^{-3 ），在夏末和初秋中（213 PL•1,000 m -3}），极低（24 PL•1,000 m）^-3 ) 在深秋。高单倍型和核苷酸多样性（高清= 0.77; π= 0.002) 没有结构化种群 (F _st < 0)，这表明整个尤卡坦大陆架有连续的基因流动。这些信息为未来全面了解其生物周期和种群动态奠定了基础。