Foxface rabbitfish
A venomous, color-changing rabbitfish from Indo-Pacific reefs.
The foxface rabbitfish (Siganus vulpinus) is a marine ray-finned fish belonging to the rabbitfish family Siganidae. It goes by several common names, including foxface, black-face rabbit fish, badger fish, and common foxface. This species inhabits the Indian and Pacific Oceans and is also found in the aquarium trade. German zoologists Hermann Schlegel and Salomon Müller first described the species in 1845, naming it *Amphacanthus vulpinus* based on a specimen from Ternate Island in Indonesia’s Molucca Islands. The blotched foxface (*Siganus unimaculatus*) is distinguished by a large black spot below the soft-rayed part of the dorsal fin. These two forms overlap in range and are not genetically distinct; they may be recently evolved species or simply color morphs, and some argue they should be combined under the name *S. vulpinus*. The specific name *vulpinus* means "fox-like," likely referring to the fish’s pointed snout, though Schlegel and Müller did not explain the reasoning. The foxface rabbitfish has a compressed body, with a depth that fits into its standard length 1.9 to 2.4 times. Its head has a steep dorsal profile behind the eye, an indentation between the eyes, and a tubular snout. The caudal fin is weakly forked, and there is a procumbent spine on the nape in front of the dorsal fin. Like all rabbitfishes, it has 13 spines and 10 soft rays in the dorsal fin, and 7 spines and 9 soft rays in the anal fin. The spines contain venom glands. This species reaches a maximum total length of 25 cm, though 20 cm is more typical. Its main color is vivid yellow, with white on the head and front part of the body. When threatened, it can quickly camouflage by changing to a dark brown. A black band runs backward from the mouth, through the eye, to the start of the dorsal fin, and a black area on the breast extends upward to just above the base of the pectoral fin, tapering as it goes. The foxface rabbitfish is found in the far eastern Indian Ocean and the western Pacific, from Indonesia to the Marshall and Gilbert Islands, north to Taiwan, and south to New Caledonia and Australia. In Australia, it occurs on northern reefs and offshore reefs in Western Australia, at Ashmore Reef in the Timor Sea, and on the east coast in Queensland from the northern Great Barrier Reef to the Capricorn Islands. It has been recorded at depths up to 30 m.
Quick Facts
- Taxon
- Siganus vulpinus
Facts from the source article.
Lore & Background
The foxface rabbitfish has a compressed body with a steep dorsal head profile and a tubular snout. Its main color is vivid yellow with white on the head and front body, but it can quickly change to dark brown when threatened. A black band runs from the mouth through the eye to the start of the dorsal fin, and a black area on the breast tapers upward above the pectoral-fin base. The caudal fin is weakly forked, and the fin spines contain venom glands. It occurs in the far eastern Indian Ocean and western Pacific, from Indonesia to the Marshall and Gilbert Islands, north to Taiwan, and south to New Caledonia and Australia. In Australia it is found on northern and offshore reefs of Western Australia, at Ashmore Reef in the Timor Sea, and on the east coast from the northern Great Barrier Reef to the Capricorn Islands. It lives in lagoons and seaward reefs with rich coral growth, down to 30 m. The species is omnivorous, feeding mostly on algae and zooplankton. Adults are typically solitary or in pairs and associate with branching Acropora corals. Juveniles and subadults may form large schools, feeding on algae growing on the bases of Acropora corals. The venom in its fin spines is similar to that of stonefishes.
Reader's Guide
The foxface rabbitfish is a moderately sized reef fish reaching up to 25 cm total length, though 20 cm is more typical. Its body is compressed, with a depth 1.9 to 2.4 times into its standard length. The dorsal fin has 13 spines and 10 soft rays, and the anal fin has 7 spines and 9 soft rays; all fin spines contain venom glands. The species is notable for its ability to rapidly change color from vivid yellow with white on the head to dark brown when threatened, a camouflage response. In the reef ecosystem, it is omnivorous, consuming mostly algae and zooplankton, and is associated with branching Acropora corals. Adults are territorial and found alone or in pairs, while juveniles and subadults may form large schools that graze algae on coral bases. In the aquarium trade, it is a commonly available species. No catch statistics are kept, but in some areas it appears in mixed catches of reef fish taken by spearfishing.
Did You Know?
- The foxface rabbitfish can quickly change color from vivid yellow to dark brown when threatened.
- Its fin spines contain venom similar to that of stonefishes.
- The species was first formally described in 1845 from Ternate Island in the Molucca Islands.
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