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I talked about this on Episode-2778- 15 Fishing Hacks for the Everyday Fisherman. It is a very simple technique basically take shrimp, cover it with salt and wait at least one day, a few days are even better.
I love shrimp as catfish bait, both Channel Cats and Bullheads love it. The problem is if smaller fish are around (and they usually are) it is a very easy bait for fish to steal. One of my favorite local ponds is full of Bullheads but has a ton of small ones. I had given up on shrimp there because I was catching may be one fish for ten baits. Switching to salted I am now getting about nine hook ups to ten baits and sometimes even more that ten because it stays on so well you can sometimes reuse the same piece for 2-3 fish.
Though I am focusing on catfish here, this is also awesome bait in salt water too. Shout out to the Hey Skipper channel for turning me onto this technique.