Just like the other guy's, I've been using raw and cooked shrimp and prawns for several years and they work great for me. I always cut it up into smaller pieces and tie it up into "shrimp balls" with netting, from dime to quarter size. Use the smaller size in clear conditions and the larger in high water cloudy situations. I fish them with drift gear and/or under floats. However I don't put them on the hook, I use a large needle and thread them on the leader above the hook. This allows me to put a small bit of yarn in the loop if I want but it also leaves the hook bare for better penetration.
"shrimb balls" are clean, can be colored, and I store them in old plastic film cans in the freezer.