A Snook swim down the beach in the Atlantic Ocean off of South Florida. The Centropomidae are a single genus family of freshwater and marine fishes in Order Perciformes, including the common snook or róbalo, Centropomus undecimalis. Prior to 2004, three other genera were placed in Centropomidae in subfamily Latinae, which has since been raised to the family level and renamed Latidae because a cladistic analysis showed the old Centropomidae to be paraphyletic. Each of the four species (fat, swordspine, common, and tarpon) can be easily identified by their lateral black line. They are good tablefare, and are a sought after gamefish but tricky to catch.Dating from the upper Cretaceous, the centropomids are of typical percoid shape, distinguished by having two-part dorsal fins, a lateral line that extends onto the tail, and, frequently, a concave shape to the head. They range from 35 centimetres (14 in) to 120 centimetres (47 in) in length and are found in tropical and subtropical waters. (Jason Arnold/RRA-MEDIA)