Masked Swallowtail Angel (Genicanthus semifasciatus)
The Masked Swallowtail Angel is an elegant marine angelfish admired for its streamlined body shape, graceful swimming style and striking sexual differences between males and females. Unlike many larger angelfish, Genicanthus species are primarily open-water planktivores rather than coral grazers, making them one of the more dependable choices for reef aquariums. Peaceful, active and highly attractive, this species is best suited to spacious, mature marine systems with excellent water quality and plenty of open swimming room.
Common Name:
Masked Swallowtail Angel, Japanese Swallowtail Angelfish
Scientific Name (Latin):
Genicanthus semifasciatus
| Specimen Details | Details |
|---|---|
| Size (adult) | Up to 12 cm (4.7 inches) |
| Water Temperature | 24–28°C (75–82°F) |
| Salinity | 1.020–1.025 |
| Compatibility | Peaceful; avoids aggressive fish and small invertebrates |
| Feeding | Planktivorous; accepts live, frozen, and flake foods |
FAQ
What is the typical size of a Masked Swallowtail Angel when fully grown?
The adult size of a Masked Swallowtail Angel typically reaches up to 12 cm (4.7 inches).
Is this angelfish suitable for a reef aquarium?
Yes, the Masked Swallowtail Angel is well-suited for reef aquariums due to its peaceful nature and planktivorous diet, which does not damage corals.
How does the male differ from the female in appearance?
Males have more vibrant coloration and a distinct tail pattern, while females are generally paler with less pronounced markings.
Anthony Sharp –
Added a Masked Swallowtail Angel to my 180-liter reef tank. It’s very active and swims gracefully through the water column. The fish has adapted well to the system and doesn’t seem to compete with other inhabitants. Feeding is easy with a mix of frozen and flake foods. A beautiful addition to the tank.
Kylie Brown –
The fish arrived healthy and looks vibrant. It’s peaceful and doesn’t bother other species. I appreciate that it doesn’t graze on corals, which makes maintenance easier. Needs a spacious tank though, so I made sure to provide enough open swimming space.
Joan James –
This angelfish has become a highlight in my marine setup. Its coloration is striking, especially in the light. It’s active but not aggressive and seems to thrive in the current water conditions. I recommend it for experienced reef keepers with stable systems.