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The black arowana, ''Osteoglossum ferreirai'', is a freshwater bony fish of the family Osteoglossidae, commonly kept in aquaria. ==Description== Its natural habitat are the still waters of the Negro River basin (Brazil and Colombia) and the upper Essequibo River basin (Guyana) in South America. It has a long body and a tapered tail and can grow to a maximum size of . The juveniles are black with yellow markings down the length of the body, head and the tail. Once it reaches about 15 cm, the markings will disappear and it will start to obtain a dark iridescent steel grey to blue coloration, hence its common name. Additionally, there is a bright yellow and a red outlining or the dorsal, caudal and tail fins The species is also called water monkey or the ''monkey fish'', because it can literally jump out of the water and capture its prey. It usually swims near the water surface awaiting for potential prey. Although it has been known to eat larger prey like small bats and birds and even small monkeys, their main diets consist of shrimps, insects, smaller fishes and other animals that float on the water surface, on which its draw-bridge-like mouth is exclusively adapted for feeding. Arowana are also called "dragonfish" by aquarists because of their shiny armor-like scales, which are similar to the Asian folklore of dragons. 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「black arowana」の詳細全文を読む スポンサード リンク
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