Tidepools are one of the intertidal habitats providing homes to many marine species. This study investigated the diversity and abundance of tidepool fishes on a rocky shore from Bangladesh. Fish samples were collected from the east and west coasts of St. Martin’s Island between November 2018 and March 2019. There were 441 specimens distributed in 23 species belonging to 20 genera and 14 families. Among those, 11 species represented new records for Bangladesh, namely Allenbatrachus reticulatus, Bathygobius coalitus, Bathygobius curacao, Callogobius hasseltii, Crenimugil crenilabis, Halichoeres nigrescens, Istigobius decoratus, Istigobius ornatus, Ostorhinchus cookii, Siganus sutor and Yongeichthys nebulosus. The most speciose families were Gobiidae (6 species), Pomacentridae (3 species) and Blenniidae (2 species), and in terms of number of individuals, Gobiidae (42%) and Blenniidae (38%) were abundant. The mean abundance of fish in tidepools was decreasing with increasing intertidal elevations (i.e. lower > middle > upper intertidal zones), although the differences were not significant. Moreover, fish abundance and diversity were positively correlated with the surface area of tidepool. Six species were common in the sampling sites, and the east coast of St. Martin’s Island had higher species richness and diversity than the west coast. Temperature (31.8 ± 2.9 °C), salinity (31.8 ± 2.1‰) and pH (8.3 ± 0.1) of the tidepool waters were comparable to those reported for a range of rocky/reef environments across the Asia–Pacific region. This is the first report on tidepool fishes from the northern Bay of Bengal that can be useful for understanding the ecological importance of intertidal zones, and further expanding the knowledge of marine biodiversity and natural history in data-poor regions.

潮池是潮间带栖息地之一，为许多海洋物种提供了住所。这项研究调查了孟加拉国多石海岸上的潮汐鱼类的多样性和丰富性。在2018年11月至2019年3月之间，从圣马丁岛的东海岸和西海岸采集了鱼类样品。共有441个标本分布在属于20属14个科的23个物种中。其中11个物种代表了孟加拉国的新记录，即Allenbatrachus reticulatus，Bathygobius Coalitus，Bathygobius curacao，Callogobius hasseltii，Crenimugil crenilabis，Halichoeres nigrescens，Istigobius decoratus，Istigobius ornatus，Ostorhinchus cookii，Siganus导师和Yongeichthys nebulosus。最具体的科是戈壁科（6种），禾本科（3种）和and科（2种），就个体数量而言，戈壁科（42％）和B科（38％）丰富。潮间带的鱼的平均丰度随着潮间带高度的增加而降低（即潮间带下部>中部>潮间带上部），尽管差异并不显着。此外，鱼类的丰度和多样性与潮池的表面积呈正相关。采样点共有6种，圣马丁岛东海岸的物种丰富度和多样性高于西海岸。潮汐池水域的温度（31.8±2.9°C），盐度（31.8±2.1‰）和pH（8.3±0.1）与亚太地区一系列岩石/礁石环境的报告值相当。