small cats like the one you got are very tasty, the bigger ones aren't worth the time and effort, the easiest way I have found to reduce the "muddy" taste on catfish is to cut their gills to bleed em out, put em on ice clean em and eat em
I normally head them and gut them, leave skin attached but scrape the slime off with the back end of the fillet knife, wrap in tinfoil with butter, salt, pepper and onions and do em on the BBQ, peel the skin off remove the rib bones and ... dam I'm hungry now