Distinguished by black blotches in their guts, clearly visible through their transparent, scaleless skin. They are bottom dwelling bony fish that have slender, somewhat cylindrical bodies and heads that look like lizards. The dorsal fin is located in the middle of the back and is accompanied by a small adipose fin that is close to its tail. Their mouths are full of sharp teeth, even on the tongue.
Name Family Size HabitatBehaviour : (various genera) Harpadon, Saurida, Synodus, Trachinocephalus : Synodontidae: Can grow up to 60 centimetres long: Found in shallow tropical and subtropical waters around the world, no more than400 metres (1,300 feet) deep: Camouflages itself in sandy environments. It hides beneath the sand and is capable of rapidly swimming more than five metres to capture its prey. It is territorial. Feeds on small pelagic, gregarious fish