The moonfish are a small family of 6 species of very laterally compressed (thin) fish with disc shaped bodies and tall fins. Due to their silvery colour, they are often referred to as moonfish, and can been seen in shallow areas during Koh Lanta diving trips.
These fish are small to medium sized, often 15 to 25 cm. Unusually, scales occur on their dorsal fins and sometimes on the anal fins.
These fish are usually seen in very shallow water, close large rocky ledges, boats, piers and harbours.