Flathead catchfish are the most nocturnal of the three fish, and is more likely to be caught at night, particularly when among slow-moving water. During the day they often stay in their deep holes which can be difficult o find. Blue catfish and channel catfish can be caught all day long. Start by targeting any holes or structure that you can find. Drift fishing during the day is also a succesful method. Try multiple depths until you find the depth that the catfish are travelling in.