Science Hax

Arowanas were the oldest fish species for over 160 million years, from the late Triassic period about 230 million years ago until the end of the Cretaceous period 65 million years ago. Arowanas are freshwater bony fish. 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 fi...