Remind me to tell you guys about the guy who met his future wife on the shores of a lake next to an outhouse.
In the meantime, I'll try to un-hijack the thread so J.E. Craig gets an answer.....
Flathead catfish spawn well after largemouth bass. If bass spawn in March, flatheads spawn in late May, early June. Yes, a flathead will hole up in a trash can, if there is no other better place. But, it has to be completely closed in, with a hole in one end that's large enough for the fish to go in. In order for a catfish to stay inside, he also needs a reason. Eggs...that means there must also be a mommy. The best way to remove flathead catfish is to consistently fish for them, spring to fall. When they go inside a place to hide, it's strictly for spawning. They don't normally hide in caves. They live in similar habitat as largemouth bass. They like cover, fairly shallow, quick access to deep water. Bowfins would rather live in or near thick aquatic vegetation.

Teach a man to grow fish...
He can teach to catch fish...