Iteresting topic...My story is not really up there with Barra, Jewies and the like, but interesting anyway... I took my kids down to lake in a park where you could feed the fish ( fork tailed catfish) and turtles with bread. just for entertainment I took a rod with and unweighted hook, The turtles and catfish were moving in in droves as we threw bread into the very dirty water, the turtles were comming in close and the catfish were staying further out, I baited the hook and cast it out as far as I could as I did'nt want to hook a turtle, a catfish grabbed it and I handed it to my Daughter who reeled it in.It was grunting loudly..as they do..
We released the fish and almost instantly all the catfish vanished, we could not even intice them with more bread on the surface...so , in this case..catfish are definatly shut down after reliese, However I'm sure you have all been fishing in a creek or lake where you can catch and release catfish all day long, but I guess thats a lot bigger/deeper area???