High Quality Content by WIKIPEDIA articles! The arapaima is an "obligatory air breather". The fish can obtain oxygen from air by sucking it into the swim bladder, which is lined with capillaries like lung tissue. The name "bonytongues" is derived from a toothed bone on the floor of the mouth, the "tongue", equipped with teeth that bite against teeth on the roof of the mouth. In this family of fishes, the head is bony and the elongate body is covered by large, heavy scales, with a mosaic pattern of canals. The dorsal and the anal fins have soft rays and are long based, while the pectoral and ventral fins are small. Arowanas are freshwater bony fish of the family Osteoglossidae, sometimes known as "bonytongues".
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