Masked Swallowtail Angelfish

(Genicanthus semifasciatus)

Genicanthus Angelfish should be added to well established aquariums with plenty of room to swim. Plenty of rock work, caves, cracks and crevices should be provided for grazing and hiding. Genicanthus Angelfish are generally considered reef safe. A diet of marine meaty, angel and algae based foods should be provided multiple times daily. Care will need to be taken when handling Angelfish as they have cheeks pines, avoid using nets when handling. Genicanthus Angelfish are hermaphroditic meaning they may have both sex organs at some point in their lives. May keep pairs or harems in the same aquarium but should be added at the same time. Males and females are sexually dimorphic meaning males and females are easily distinguishable.

The Masked Swallowtail Angelfish is also known as the Masked Japanese Swallowtail Angelfish. Females are are a two tone gray to white with yellow on the edge of its dorsal fin and black on its head and tail. Males have a yellow head, frontal sides and upper body and dark yellow vertical bands. Masked Swallowtail Angelfish can grow to 8".

We recommend a minimum aquarium size of 125 gallons or larger for this species.

Water conditions: Salinity 1.020 - 1.025, Temp (F) 72 - 78, pH 8.1 - 8.4, Alkalinity 8 - 12 dKH

  • Care: CareModerateModerate
  • Behavior: BehaviorSocialSocial
  • Diet: DietFrozen FoodFrozen Food DietHerbivoreHerbivore DietLive FoodLive Food
  • Habitat: HabitatReefReef
  • Light: LightMediumMedium