How to identify Catfish

Blue Catfish vs Blue Channel Catfish

Channel Catfish
Rounded anal fin, 25-29 Spines
Blue with dark spots (but spots vanish on larger fish)

Blue Catfish
Squared front anal fin, 29-35 splines
Blue but often silver tint

Flathead
No forked tail and obvious flat wide head and huge mouth - brown and/or yellow (yellow cat)