Masked Swallowtail Angelfish (Genicanthus semifasciatus) Care
The Masked Swallowtail Angelfish, Genicanthus semifasciatus, is also known as the Japanese Swallow Angelfish. These fish come from the Western Pacific Ocean. Unlike most angelfish, the males and females of this species look quite different. Males have a yellow head and the sides in the front and the upper body are a darker yellow-orange with black vertical bands. Females are a brownish-yellow on the upper portion of their body and white on the lower half. One the female, the dorsal fins are trimmed in yellow and the eyes are rimmed in blue.
These fish are omnivores and require a diet including marine algae, mysis and brine shrimp, and angelfish food.
Masked Swallowtail Angelfish do best in an aquarium that is at least 125 gallons or more and that has plenty of live rock to graze on and hide in. In the wild, these fish live in deeper waters and do well in deep water aquariums with less intense lights.
They are reef safe and not prone to nipping at corals and sessile invertebrates, unlike many angelfish.
Approximate Purchase size
Small: 1” to 1-1/2”
Medium: 2-1/2” to 3-1/2”
Large: 4-1/2” to 5-1/2”