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<p>Mudskippers and eel gobies (Gobiiformes: Oxudercidae: Oxudercinae and Amblyopinae) are burrow-associated fishes of soft-bottom habitats, whereas their larvae are free-living and pelagic, with the postflexion stage recorded from bank and nearshore waters. Despite their wide distribution from tropical to temperate waters and numerous reports on larval fish assemblages across their range, few studies provide larval information for these groups. To investigate how sampling design affects the representativeness of larval occurrence data, cross-shore patterns in the distribution of postflexion larvae were examined in wadeable nearshore waters using a small seine (1 × 4&#xa0;m; 1-mm mesh). In northern Vietnam, fieldwork was conducted at a muddy–sandy station in Cat Ba National Park (Hai Phong Province) from 29 June to 2 July 2023 and at a mangrove-fringed site in the Tien Yen coastal wetland (Quang Ninh Province) on 21 June 2024. Daily sampling at three distance intervals from the water’s edge (0–5&#xa0;m, 10–15&#xa0;m, and 20–25&#xa0;m) was conducted along the shoreline. Postflexion larvae representing six mudskipper and eel goby species were recorded: <i>Apocryptodon madurensis</i>, <i>Boleophthalmus</i> sp., <i>Periophthalmus modestus</i>, <i>Caragobius</i> sp., <i>Taenioides</i> sp., <i>Trypauchenopsis intermedia</i>. They showed strong cross-shore heterogeneity in species composition, species richness, and larval abundance across the three sampling bands, with the lowest abundance and species richness at the 0–5&#xa0;m band. These preliminary results suggest that seine effort should be distributed across multiple cross-shore positions within nearshore waters to represent better the occurrence and abundance of postflexion mudskipper and eel goby larvae.</p>

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Cross-Shore Distribution of Postflexion Mudskipper and Eel Goby Larvae in Nearshore Waters Informs Seine Sampling Design

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Thanh Trung Tran,
  • Linh Thuy Nguyen,
  • Mai Nhat Lai,
  • Nam Thanh Nguyen

摘要

Mudskippers and eel gobies (Gobiiformes: Oxudercidae: Oxudercinae and Amblyopinae) are burrow-associated fishes of soft-bottom habitats, whereas their larvae are free-living and pelagic, with the postflexion stage recorded from bank and nearshore waters. Despite their wide distribution from tropical to temperate waters and numerous reports on larval fish assemblages across their range, few studies provide larval information for these groups. To investigate how sampling design affects the representativeness of larval occurrence data, cross-shore patterns in the distribution of postflexion larvae were examined in wadeable nearshore waters using a small seine (1 × 4 m; 1-mm mesh). In northern Vietnam, fieldwork was conducted at a muddy–sandy station in Cat Ba National Park (Hai Phong Province) from 29 June to 2 July 2023 and at a mangrove-fringed site in the Tien Yen coastal wetland (Quang Ninh Province) on 21 June 2024. Daily sampling at three distance intervals from the water’s edge (0–5 m, 10–15 m, and 20–25 m) was conducted along the shoreline. Postflexion larvae representing six mudskipper and eel goby species were recorded: Apocryptodon madurensis, Boleophthalmus sp., Periophthalmus modestus, Caragobius sp., Taenioides sp., Trypauchenopsis intermedia. They showed strong cross-shore heterogeneity in species composition, species richness, and larval abundance across the three sampling bands, with the lowest abundance and species richness at the 0–5 m band. These preliminary results suggest that seine effort should be distributed across multiple cross-shore positions within nearshore waters to represent better the occurrence and abundance of postflexion mudskipper and eel goby larvae.