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<p>Cuttlefish represent crucial economic marine resources in Southeast Asian waters, although their population structures and genetic diversity patterns remain poorly understood. This study examined the morphological and genetic characteristics, along with the phylogeographic history, of <i>Sepia aculeata</i> populations around Thai-Malay Peninsula, with specimens collected across the Gulf of Thailand and the Andaman Sea. A total of 134 specimens were collected: 82 from the Gulf of Thailand and 52 from the Andaman Sea. Morphological analysis revealed that <i>S. aculeata</i> specimens ranged 29–473&#xa0;g (mean: 197 ± 120&#xa0;g) in weight and 5.9–16.9&#xa0;cm (mean: 11.68 ± 2.72&#xa0;cm) in mantle length (ML). The cuttlebone’s anterior striae presented three distinct shapes, including inverted V, inverted U, and M, which were correlated with specimen size. Length-weight analysis revealed different growth patterns: females showed negative allometric growth, while males exhibited isometric growth. Phylogenetic analysis using COI, 16S rRNA, and 12S rRNA genes confirmed all samples belong to <i>S. aculeata</i>, with no significant genetic differentiation between populations from the two regions. Haplotype analysis revealed shared genetic patterns, though the Andaman Sea population exhibited significantly higher genetic diversity compared to the Gulf of Thailand population. Mismatch distribution and neutrality tests suggested recent population expansion in both regions. These findings suggest implementing sex-specific harvesting strategies, particularly protecting larger females for population sustainability. Additionally, while genetic connectivity supports managing <i>S. aculeata</i> as a single stock, the higher genetic diversity observed in the Andaman Sea emphasizes the need to prioritize it as a genetic reservoir for conservation planning.</p>

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Morphological variation and genetic connectivity of needle cuttlefish (Sepia aculeata Van Hasselt, 1835) populations in Thai-Malay Peninsula waters: implications for fishery management

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • Praewa Kongmeephol,
  • Xiaodong Zheng,
  • Charuay Sukhsangchan

摘要

Cuttlefish represent crucial economic marine resources in Southeast Asian waters, although their population structures and genetic diversity patterns remain poorly understood. This study examined the morphological and genetic characteristics, along with the phylogeographic history, of Sepia aculeata populations around Thai-Malay Peninsula, with specimens collected across the Gulf of Thailand and the Andaman Sea. A total of 134 specimens were collected: 82 from the Gulf of Thailand and 52 from the Andaman Sea. Morphological analysis revealed that S. aculeata specimens ranged 29–473 g (mean: 197 ± 120 g) in weight and 5.9–16.9 cm (mean: 11.68 ± 2.72 cm) in mantle length (ML). The cuttlebone’s anterior striae presented three distinct shapes, including inverted V, inverted U, and M, which were correlated with specimen size. Length-weight analysis revealed different growth patterns: females showed negative allometric growth, while males exhibited isometric growth. Phylogenetic analysis using COI, 16S rRNA, and 12S rRNA genes confirmed all samples belong to S. aculeata, with no significant genetic differentiation between populations from the two regions. Haplotype analysis revealed shared genetic patterns, though the Andaman Sea population exhibited significantly higher genetic diversity compared to the Gulf of Thailand population. Mismatch distribution and neutrality tests suggested recent population expansion in both regions. These findings suggest implementing sex-specific harvesting strategies, particularly protecting larger females for population sustainability. Additionally, while genetic connectivity supports managing S. aculeata as a single stock, the higher genetic diversity observed in the Andaman Sea emphasizes the need to prioritize it as a genetic reservoir for conservation planning.