Townsend’s Angelfish, Holacanthus townsendi

Townsend’s Angelfish townsendi. Underwater photographs taken in coastal waters of Yal-Ku, Quintana Roo, April 2017. Photographs and identifications courtesy of Juan Rojo, Akumal.

Townsend’s Angelfish, Holacanthus townsendi, is a member of the Angelfish or Pomacanthidae Family, and is known in Mexico as ángel townsendi. Townsend’s Angelfish is one of the first recognized hybrids in the Pomacanthidae Family being a naturally occurring hybrid of the Blue Angelfish, Holacanthus bermudensis, and the Queen Angelfish, Holacanthus ciliaris. It is not recognized within the scientific community as a true species. These hybrids display a striking blend of parental traits, often showing a yellow body with blue highlights, enhanced facial markings, and variable tail coloration.

The Townsend’s Angelfish has a deep compressed body. Coloration and patterning can vary significantly between individuals. The juvenile is basically a blue fish with a golden head and throat and vertical barring on the body. This transforms into a yellow fish with blue overwashes, the contrast between yellow and blue causing many of the body scales to be reticulated and individually prominent. There are iridescent blue markings on the face and fins, surrounding the dark circular “crown” on the top of the head.

The Townsend’s Angelfish is found in shallow waters in reef-associated environments close to the bottom. They reach a maximum of 45 cm (18 inches) in length and 1.6 kg (3.5 lbs) in weight. Adults are omnivore and feed on a wide range of algae and invertebrates including sponges as well as corals, gorgonians, tunicates, and zoanthids. Juveniles feed on algae and detritus. Townsend’s Angelfish is poorly studied with very limited information available about their lifestyle and behavioral patterns including specific details on age, diet, growth, habitat, longevity, movement patterns, and reproduction. Their morphometrics have not been published in the scientific literature.

The juvenile Townsend’s Angelfish is most likely confused with the juvenile Blue Angelfish, Holacanthus bermudensis (due to their similar colorations) and adults are most like confused withthe Queen Angelfish, Holacanthus ciliaris (bright yellow tail and curved middle bars, which are straight on the Blue Angelfish).

Townsend’s Angelfish is a resident of all Mexican waters of the Atlantic Ocean including the Gulf of Mexico and the Caribbean.

From a conservation perspective the Townsend’s Angelfish has not been formally evaluated. They are utilized by the aquarium trade being known for their stunning grace and winning personalities; however, they are large in stature and difficult to maintain and sold at elevated prices. They are of scientific interest for their relationship with the Blue Angelfish and the remote locations they are found in the mid-Atlantic, where a limited gene pool and local recruitment are thought to be the reasons for the appearance of several unique color morphs found nowhere else.