Dark Damselfish
Dark Damselfish
Dark Damselfish - juvenile
© Nikolai Vladimirov
Fishes · Bony fishes · Pomacentridae

Dark Damselfish

Pomacentrus aquilus Allen & Randall, 1981
12 cm1-15 mEndangered
860

The Dark Damselfish, scientifically known as Pomacentrus aquilus, is a fascinating species that thrives in the warm, tropical marine waters of the 🌊 Western Indian Ocean. Found primarily in the non-aggressive environment of inshore coral reefs, this species benefits from the rich biodiversity these reefs offer. Known to inhabit waters ranging from the 🌊 Red Sea and 🌊 Persian Gulf down south to 🇲🇬 Madagascar and along the east African coast to at least 🇰🇪 Kenya, these damselfish prefer staying within a depth range of 1 to 15 meters.

Reaching a maximum length of 12 centimeters, the Dark Damselfish is adapted to life in the vibrant underwater ecosystems that coral reefs provide. Unlike some fish species, it does not migrate, finding all it needs for survival and reproduction in its local environment. The reproductive habits of the Dark Damselfish are particularly interesting; they are oviparous, meaning they lay eggs rather than live-bearing their young. During the breeding season, these fish engage in distinct pairing behavior. The eggs they produce are demersal, meaning they sink and adhere securely to the reef substrate. An important role falls to the males, who vigilantly guard and aerate the eggs, ensuring their development in the bustling underwater community.

This characteristic behavior and adaptability underscore the important role the Dark Damselfish plays in the delicate balance of reef ecosystems. Their presence is a testament to the intricate and interdependent relationships that marine life forms share within the reef environment. Whether it is their contribution to the biodiversity of the reefs or their visual appeal to divers and marine enthusiasts, the Dark Damselfish stands out as a vital species within its natural habitat.

Why it's threatened

Residential & commercial development
Housing & urban areas · Commercial & industrial areas · Tourism & recreation areas
Human intrusions & disturbance
Work & other activities
Climate change & severe weather
Temperature extremes
Other
Other threat

In the Persian Gulf, substantial sea bottom dredging, resulting in changes of water flow and sedimentation rates, for industrial, infrastructure-based, and residential and tourism development along the coast have caused deterioration in most benthic habitats (Sheppard et al. 2010). Coral assemblages in the Persian Gulf, are estimated (likely overestimated) to have a total area of occupancy of 700 km². Al-Ghadban and Price (2002) determined that by the early 1990s, 40% of most of the Persian Gulf states' coasts had been developed in some way. It is not known whether or not P. aquilus is directly affected by coastal development, but due to the large-scale of coastal development throughout the Persian Gulf and given the habitat preferences of the species, it is likely that it is impacted negatively in some parts of the region. As a result of increasing sea surface temperatures, coral bleaching events have also increased in frequency over the past few decades (Burt et al. 2014), degrading coral assemblages in the Persian Gulf, especially those found nearshore in the southern Persian Gulf. This is likely to also have a negative impact on this species.

Threat classification from the IUCN Red List.

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Last Update: June 28, 2026