| Noun | 1. | Perciformes - one of the largest natural groups of fishes of both marine and fresh water: true perches; basses; tunaPercoidea, suborder Percoidea - in some classifications nearly or exactly equivalent to the Perciformes which are considered a suborder perch - any of numerous spiny-finned fishes of various families of the order Perciformes freshwater bream, bream - any of various usually edible freshwater percoid fishes having compressed bodies and shiny scales; especially (but not exclusively) of the genus Lepomis sea bream, bream - any of numerous marine percoid fishes especially (but not exclusively) of the family Sparidae | |