Several studies indicate that burrows play an essential role in burrowing fish, especially mudskippers, but little is known on burrow morphology and utilization of Periophthalmodon septemradiatus. This study was therefore conducted at five sampling sites from the estuary to upper reaches of Hau River to contribute to the knowledge of the behavior of Pn. septemradiatus, via in situ and ex situ observations of the utilization of burrow structures. Burrows made by polyester resin were used to determine their morphology. The male mudskippers Pn. septemradiatus were observed to excavate burrows using their mouths during the low tide. The burrows' shapes were found to be J, U and W, with 1–3 openings and one bulbous chamber. The chamber was used as egg container where the mudskipper deposits their fertilized eggs. W‐shaped burrows were found to be interconnected chambers where the mudskipper used it to change direction of movements inside the burrow. For the J‐ and U‐shaped burrows, the commonality at all five sites was identified. The W‐shaped burrows were common and were only found at two sites (Long Duc and An Lac Tay). For the burrows' structure, the openings to the surface were oval, circular and bulbous in shape. Yet, there were variations between sites, and the burrows' size was similar during the dry and wet seasons. At different sites, the depth of the burrows seasonally changed. The burrows used by mudskipper provide shelter, spawning sites, and access to feeding grounds for other mudskipper species.

中文翻译：

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湄公河三角洲泥sk的穴位结构及其利用

几项研究表明，穴居在穴居鱼类（尤其是mud鱼）中起着至关重要的作用，但对穴位形态和对io眼裂孔虫的利用知之甚少。因此，这项研究是在从河口到上河上游的五个采样点进行的，以有助于人们了解Pn的行为。septemradiatus，通过就地和迁地保护洞穴结构的利用率的观察。用聚酯树脂制成的洞穴用于确定其形态。男性mud鱼Pn。隔radi在退潮时，人们观察到他们用嘴挖洞。洞穴的形状为J，U和W，具有1-3个开口和一个球根室。该室被用作卵容器，在那里，泥船长将其受精卵沉积。发现W形洞穴是相互连通的小室，在这里，泥船匠用它来改变洞穴内部的运动方向。对于J型和U型洞穴，已确定了所有五个地点的共性。W型洞穴很常见，仅在两个地点（长德和安拉泰）发现。对于洞穴的结构，其表面的开口为椭圆形，圆形和球形。然而，地点之间存在差异，并且在干旱和潮湿季节，洞穴的大小相似。在不同的地点，洞穴的深度随季节变化。