Chaetodontoplus septentrionalis, M

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Chinese Blueline Angel. Chaetodontoplus septentrionali. Care: Expert. Diet: Omnivorous. Light: Medium. Place of origin: Western Pacific

Northern West-Pacific, Japan to Taiwan, and southern Korea to Hong Kong, but mainland populations look slightly different. Found on rocky coastal reefs at depths from about 5 to 60m. It has electric blue stripes along its sides and a bright yellow tail. Post-larval juveniles are almost completely black, having a yellow band behind the eye that will disappear with growth. No sexual dichromatism is know and they occur in pairs or form small harem, and females are only recognised when gravid  by their abdomen. It occurs together with a different colour form, similar to Chaetodontoplus chrysocephalus around Kashiwajima, western Shikoku and the Izu Peninsula, the sub-adults of which superficially resemble C.melanosoma and records of the latter are based on this form. It is not clear if this form is just a variation of C.septentrionalis or a separate species. Length to 22cm.