Blue Ring Angelfish

The Blue Ring Angelfish is one of the largest and most dramatic members of the Pomacanthus genus, reaching an impressive 18 inches in the wild. Adults are immediately recognizable by their deep orange-brown body adorned with sweeping curved blue lines and a distinctive electric blue ring or circle on the shoulder just above the gill plate, which gives this species its common name. The bold pattern and large size make it a commanding presence in any marine aquarium.

Like many large Pomacanthus species, the Blue Ring Angelfish undergoes a remarkable color transformation from juvenile to adult. Juveniles display a striking pattern of dark blue to black with vertical white and blue curved lines, bearing no resemblance to their adult coloration. This metamorphosis typically begins when the fish reaches 4 to 5 inches and provides a fascinating display for aquarists fortunate enough to witness the transition.

Due to its substantial adult size, the Blue Ring Angelfish requires a very large aquarium of at least 220 gallons. It is not considered reef-safe, as it will eagerly consume coral polyps, sponges, and other sessile invertebrates. This species adapts relatively well to aquarium life compared to some large angels, accepting a variety of prepared foods with minimal difficulty. It can be semi-aggressive toward similar species but generally coexists well with other robust community fish in appropriately sized systems.