The Lookdown Fish (Selene Vomer) is a game fish similar to the Atlantic Moonfish, but it can be distinguished by its dorsal and anal fins, the second ray on each fin being many times longer than the surrounding rays. It has a deep, rhombus-shaped, laterally-compressed body. The head has the mouth set low and the eyes high. The Lookdown Fish is silvery on both sides with a darker tinge on top. A young fish has several faint vertical bars that fade as it grows.
The Lookdown Fish is found in the western Atlantic, from Canada and Maine south to Uruguay, including Bermuda and the Gulf of Mexico, in marine and brackish waters near the coast, along hard or sandy bottoms. Juveniles may be seen in estuaries or near sandy beaches.