How to Identify Masked Angelfish

To identify Masked Angelfish (Genicanthus personatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Males: Predominantly white body with a prominent black mask covering the head, extending from the snout to behind the operculum. Dorsal, anal, and caudal fins may have black margins. Females: Entirely white body, sometimes with a faint yellow wash on the dorsal and caudal fins. Juveniles resemble females but may have a more pronounced yellow tint.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Pronounced sexual dimorphism in coloration., Elongated, lyre-shaped caudal fin in males., Small mouth adapted for planktivorous feeding., Relatively small scales.

Dorsal fin

Single dorsal fin with 15 spines and 15-16 soft rays. The soft-rayed portion is typically taller than the spiny portion.

Tail fin

Caudal fin is deeply emarginate to lunate, with males exhibiting elongated, filamentous lobes (lyre-shaped).

Pectoral fin

Pectoral fins are clear to translucent, moderately sized.

Distinctive fins

Pelvic fins are relatively short and pointed. Anal fin has 3 spines and 16-17 soft rays.

Identification Tips

1. 1

   Sexual Dimorphism

   Males are easily identified by their stark white body and prominent black 'mask' on the face. Females are entirely white with no mask.

2. 2

   Caudal Fin Shape

   Adult males possess a distinctive lyre-shaped caudal fin with elongated upper and lower lobes, a key differentiator from females and other Genicanthus species.

3. 3

   Geographic Location

   Its endemic status to the Hawaiian Islands is a strong indicator for identification, as it is not found naturally elsewhere.

4. 4

   Depth Preference

   Its occurrence in deeper reef environments (below 20m) helps distinguish it from many shallower-dwelling angelfish species.

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