How to Clean a Catfish: Large Catfish What qualifies as a big catfish That’s a matter of opinion, though, for our purposes, we’ll say any fish weighing more than 5 pounds.

For those who catch and clean their own catfish, the mud vein is a significant factor that contributes to the muddy taste.

Fishing duo Cole and Jay clean and cook catfish caught near a dam with expert tips.

Here’s how to clean a catfish with a nail. Score the Catfish with a Knife. Place a 3-foot-long 2×6 board on a level, waist-high surface. A truck tailgate works well.