Indian Ocean Emperor Butterfly
The adult body length of the Indian Ocean Emperor Butterfly is maximum 16cm, dorsal fin spines (total): 11-12; dorsal fin soft rays (total): 23-26; anal fin spines: 3; anal fin soft rays: 20-22. In addition, the Indian Ocean emperor butterfly has a certain scale, so when polycultured, attention must be paid to the species of polyculture.
Adult fish are generally oval in shape, very flattened on the sides, with a straight surface above the head and a slightly concave nose area. The snout is pointed but does not extend into a tubular shape, and the anterior nares have nasal valves. The edge of the anterior gill cover is finely serrated, and the gill cover membrane runs through the isthmus. The body is covered with medium-sized scales and the dorsal fin is simple. The body is milky white, with dozens of gray-blue arrow-shaped stripes on the sides of the body; there are three orange-red to black arc-shaped stripes on the head, the first one is on the snout; the second two are eye strips, and the eye strips are narrower than the diameter of the eyes. And it spreads backward to the front edge of the pelvic fin; the third one runs from the back of the hard spine of the dorsal fin through the gill cover to the rear edge of the pelvic fin. The above three black bands are all white to light yellow. The rear edges of the soft rays of the dorsal fin and the soft rays of the anal fin are yellow-green; the rear end of the caudal fin has a white edge. The Indian Ocean Emperor Butterfly and the Pacific Emperor Butterfly (Chaetodon baronessa) are very similar. The difference lies in the tail fin. The Indian Ocean Emperor Butterfly has a golden arrow-shaped pattern on its tail fin near the caudal peduncle, while the Pacific Emperor Butterfly does not.
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