blue arowana fish

against air also anal arapaimidae arowana arowanas based bite bladder blue body bone bony bonytongues breather can canals capillaries covered derived dorsal elongated equipped facultative family fins fish floor freshwater have head heavy its known large latter like lined long lung mosaic mouth name now obtain often osteoglossidae oxygen pattern pectoral rays reserved roof scales small soft sucking swim teeth tissue tongue toothed ventral which fishes