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<p>This study examined the reproductive strategy of <i>Oxyeleotris urophthalmus</i>, focusing on spawning behavior, nest-site selection, parental care, and early development. Observational and modeling approaches were applied using data from nine sampling surveys conducted from April 2024 to March 2025 in two branches of the Mekong River. Results show that <i>O. urophthalmus</i> spawned in nipa palm axils exposed to air at low tide. This spawning strategy has not been reported in gobies, apart from mudskippers. Spawning was synchronized with new and full moons. Males prepared nests, guarded eggs, and fanned them with their pectoral fins to enhance dissolved oxygen. Each clutch contained about 7,756 eggs, with mean longer and shorter axes of 1.54&#xa0;mm and 0.64&#xa0;mm, respectively. Incubation lasted 60–80&#xa0;h. The characteristics of newly hatched larvae confirm amphidromous lifestyle of this species. A generalized linear model identified axil height and water temperature as key predictors of nest-site occurrence. The spawning behavior of <i>O. urophthalmus</i> may help eggs avoid aquatic predators and maximize the transport of newly hatch larvae to the sea. Dependence on nipa palm habitats and connectivity from rivers to the sea for reproduction makes the species highly vulnerable to habitat alteration and climate change.</p>

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Reproductive ecology of the butid Oxyeleotris urophthalmus (Bleeker, 1851) in the intertidal zone of the Mekong Delta, Vietnam

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Hoang M. Tran,
  • Loi X. Tran

摘要

This study examined the reproductive strategy of Oxyeleotris urophthalmus, focusing on spawning behavior, nest-site selection, parental care, and early development. Observational and modeling approaches were applied using data from nine sampling surveys conducted from April 2024 to March 2025 in two branches of the Mekong River. Results show that O. urophthalmus spawned in nipa palm axils exposed to air at low tide. This spawning strategy has not been reported in gobies, apart from mudskippers. Spawning was synchronized with new and full moons. Males prepared nests, guarded eggs, and fanned them with their pectoral fins to enhance dissolved oxygen. Each clutch contained about 7,756 eggs, with mean longer and shorter axes of 1.54 mm and 0.64 mm, respectively. Incubation lasted 60–80 h. The characteristics of newly hatched larvae confirm amphidromous lifestyle of this species. A generalized linear model identified axil height and water temperature as key predictors of nest-site occurrence. The spawning behavior of O. urophthalmus may help eggs avoid aquatic predators and maximize the transport of newly hatch larvae to the sea. Dependence on nipa palm habitats and connectivity from rivers to the sea for reproduction makes the species highly vulnerable to habitat alteration and climate change.