Funny that you say that !! One time while bass fishing (I was on the shore ) I had 2 channel cats come in real shallow and they were Working over the area real good.. I don't know much about their behavior but I do know they were ultra aggressive at this moment. I grabbed my jar of powerbait and caught a small bluegill (tips I gathered rom soflabasser, bluebasser86,and gordo in another thread I started called channel catfish strategy) and I rigged it up on my top water rod. I tried casting it out and reeling it in slowly but it got no action. So I sliced it and let it sit on the bottom where I saw it last.. and went back to bass fishing. About 10 minutes later I seen my line tighten and I missed the fish. So I put a bobber on, and right after I recast the catfish came up and nailed the bobber in about 8-10FOW. Blew my mind because I've always been told they were bottom feeders... I've never caught one top water but that experience alone tells me it can be done !