Spotfin Butterflyfish
Bold, bright, and easy to care for, the Spotfin Reef Butterfly is named for the small, black spot located on the end of the dorsal fin. Adults are white, with bright yellow pelvic and caudal fins, and a narrow yellow bar from the gill to the base of the pectoral fins. A vivid black, vertical bar on the head passes through the eye. Juveniles exhibit an added dark spot at the base of the anal fins with a shadowy streak that extends to the small spot on the dorsal fin.
What really sets the Spotfin Reef Butterfly apart is at night, this fish undergoes remarkable changes. The large, dusky smudge on the dorsal fin becomes black and broad, and dark bands appear on the body. It is also known to sometimes swim upside down, and occasionally squirt water like fountain above the waterline.
| Features | Details |
|---|---|
| Color Pattern | White body, yellow pelvic and caudal fins, narrow yellow bar from gill to pectoral base, black vertical bar on head |
| Size | Up to 4 inches (10 cm) |
| Lifespan | 8 to 10 years |
| Behavior | Active during day, changes appearance at night; may swim upside down or squirt water |
FAQ
What are the distinguishing features of the Spotfin Butterflyfish?
The Spotfin Butterflyfish has a white body with bright yellow pelvic and caudal fins, a narrow yellow bar from the gill to the base of the pectoral fins, and a vivid black vertical bar on the head. A small black spot is located at the end of the dorsal fin. Juveniles have an additional dark spot at the base of the anal fin with a shadowy streak extending to the dorsal spot.
Does the Spotfin Butterflyfish change appearance at night?
Yes, at night the fish undergoes noticeable changes: the dorsal fin smudge becomes broad and black, and dark bands appear on the body. It may also swim upside down or squirt water like a fountain above the waterline.
What is the typical size and lifespan of this fish?
The Spotfin Butterflyfish grows up to 4 inches (10 cm) in length and has a lifespan of 8 to 10 years.
Sean Chapman –
The Spotfin Butterflyfish is a striking addition to my reef tank. Its bright colors during the day are eye-catching, and the nighttime behavior is fascinating—especially the way it changes color and swims upside down. It’s active and healthy, and the fish seems to adapt well to the tank environment.
Michelle Ross –
I’ve had this fish for six months and it’s still vibrant. The yellow fins and black bar on the head stand out well in the tank. I noticed it squirts water at night, which is unusual but not disturbing. It’s a peaceful fish that doesn’t stress other tank mates.
Megan North –
The fish looks exactly as described. The juvenile markings are visible, and the nighttime transformation is truly unique. It’s a great visual centerpiece and adds a dynamic element to the reef setup.