Dascyllus aruanus, commonly referred to as the whitetail dascyllus or humbug damselfish among other vernacular names, is a marine species within the family Pomacentridae.
This species typically attains a length of up to 8 centimeters, though a more common length is approximately 6 centimeters. The whitetail dascyllus is characterized by its distinctive white body featuring three black vertical bars.
Primarily associated with coral reef ecosystems, the species is often observed in groups above Acropora coral heads. During the breeding period, males may exhibit aggressive behavior towards other fish while tending to fertilized eggs.
The whitetail dascyllus is widespread across tropical waters of the Indo-Pacific region, including the 🌊 Red Sea. Recent taxonomic revisions have led to the identification of D. aruanus in the Pacific, with Forsskål's 1775 designation, Dascyllus abudafur, being reinstated for populations in the 🌊 Red Sea and the 🌊 Indian Ocean.
In the aquarium trade, these fish are frequently referred to as 'starter fish' due to their resilience to varying environmental conditions, which helps in establishing a stable tank environment for more sensitive species. They have been successfully bred in captivity. Notably, adult whitetail dascyllus can exhibit territorial and aggressive behaviors towards other fish.
Why it's threatened
Though there have been significant coral declines in its distribution, this species is not an obligate coral dweller, preferring high relief habitat.
Threat classification from the IUCN Red List.
