n. pl. perch or
perch·es 1. Any of several spiny-finned freshwater fishes of the genus Perca, especially either of two edible species, the yellow perch of North America, and P. fluviatilis of Europe.
2. Any of various similar fishes of the family Percidae, such as the walleye, or of other families, such as the white perch or the ocean perch.