The Yellow Perch (Perca flavescens) is a small, colorful fish found in freshwater lakes and rivers across North America. They typically grow up to 12 inches in length and have a yellowi... The Yellow Perch (Perca flavescens) is a small, colorful fish found in freshwater lakes and rivers across North America. They typically grow up to 12 inches in length and have a yellowish body with dark vertical bars. Yellow Perch are schooling fish that feed on insects, crustaceans, and smaller fish. They are popular among anglers for their taste and are a staple in ice fishing.Click here to read more about Yellow Perch.