Channel Catfish can be differentiated from Blue Catfish and White Catfish by their anal fin. The Channel Catfish has a straighter anal fin with a slight convex edge compared very rounded and short White Catfish anal fin. The presence of spots will positively identify it is as Channel rather than a White, but spots may not be visible in larger or very small individuals. The Blue Catfish anal fin is longer, and straighter, with over 30 rays, while the Channel Catfish does not have more than 29 rays.