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The Pearlscale Butterflyfish (''Chaetodon xanthurus'') is a species of butterflyfish (family Chaetodontidae) also known as Yellow-tailed Butterflyfish or Philippines Chevron Butterflyfish (the Chevron Butterflyfish is an unrelated species of ''Chaetodon''). It is found on or around the reefs of the central Indo-Pacific region from Indonesia and the Philippines north to the Ryukyu Islands.〔FishBase (2008)〕 In the wild adults can grow to 15 cm with no discernible differences between males and females. The body is pearly white and the scales have black edges, giving the sides a more cross-hatched pattern instead of the clear chevrons in related species. The hind parts are orangey-yellow, the base of the caudal fin is white. The head is darker than the body and bears the characteristic pattern of its lineage, consisting of vertical black eyestripes and a black white-rimmed crown spot.〔 ==Ecology in the wild and the aquarium== Pearlscale butterflyfish are a diurnal species and usually found at depths below 15 m (49 ft). They are found in clear coastal to outer reef slopes and drop-offs, often around ''Acropora'' staghorn corals. These fish have a peaceful temperament and in the wild are found either alone, in pairs, or in small groups, however they are territorial towards similar-looking species and may harass them. Due to its attractive colors, the Pearlscale Butterflyfish is a well-known aquarium fish. A 50 gallon aquarium is the minimum size recommended for them, with a water temperature of between about 74 and 80° F. Although they can be aggressive at times, they are delicate and peaceful tankmates are required for this fish to thrive in an aquarium. They may be compatible with other butterflyfishes that have a different color pattern, but there is no guarantee that their relationship will always be peaceful. When adding more than one to a tank they have to be added simultaneously, and lots of "living rock" with shelters available for them to hide helps to reduce stress. In the wild they feed on algae, soft coral polyps and small benthic invertebrates, so therefore along with other coral-eating ''Chaetodon'' species they can wreak havoc on living corals in the aquarium. They should be fed a variety of foods that can include mysid shrimp, brine shrimp, krill, spirulina and foods containing algae. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pearlscale butterflyfish」の詳細全文を読む スポンサード リンク
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