Chaetodon speculum Cuvier, 1831
Mirror butterflyfish
Ovalspot Butterflyfish,  荷包魚,  豆豉蝶,  鏡斑蝴蝶魚
Chaetodon speculum
photo by Muséum-Aquarium de Nancy/D. Terver

Family:  Chaetodontidae (Butterflyfishes)
Max. size:  18 cm TL (male/unsexed)
Environment:  reef-associated; marine; depth range 3 - 30 m
Distribution:  Indo-Pacific: Indonesia to Japan and south to the Great Barrier Reef and Papua New Guinea. Reported from Mauritius, Madagascar, and Reunion (Ref. 4858).
Diagnosis:  Dorsal spines (total): 14-14; Dorsal soft rays (total): 17-18; Anal spines: 3-3; Anal soft rays: 15-16. Description: Body color is bright yellow to orange-yellow with a big black blotch on the upper posterior portion of the trunk and a vertical black bar running through the eye (Ref. 4855). Snout length 2.9-3.3 in HL. Body depth 1.4-1.6 in SL (Ref. 90102).
Biology:  In coastal reef slopes rich with hydroids and anemones. Small juveniles secretive in coral thickets (Ref. 48636). Usually solitary and relatively uncommon. Feed on coral polyps and invertebrates (Ref. 9710). Oviparous (Ref. 205), monogamous (Ref. 52884). Form pairs during breeding (Ref. 205).
IUCN Red List Status: Least Concern (LC); Date assessed: 07 October 2010 Ref. (130435)
Threat to humans:  harmless
Country info:  Reported from Sharp Island, Hoi Ha Wan, and Tung Ping Chau (Ref. 94637). Also reported from Cape D'Aguilar and Yan Chau Tong (Ref. 129329). The species was observed on 2 to 10 occasions during 400 dive surveys on artificial reefs (Ref. 119494). Sold in live fish markets. Caught using traps and nets (Ref. 125552). Also Ref. 119714, 125586, 128523.


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