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The masked swallow angelfish (Genicanthus semifasciatus) is a species of marine angelfish found in the western Pacific Ocean, specifically in the waters around Japan, Taiwan, and the Philippines.
This species has a striking appearance, with a primarily yellow body and black bars on its face and fins, giving it its "masked" appearance. Juveniles have a similar color pattern but with thinner, more numerous bars. Masked swallow angelfish can grow up to 20 cm in length.
Masked swallow angelfish are typically found in rocky reef environments and are known to feed on small invertebrates and plankton. They are occasionally kept in home aquariums due to their unique appearance and peaceful temperament.