"Everything eats a shrimp" words from our Marine Biologist. They trap the Prawn migrations in the various Mississippi rivers including the Big Muddy. It's remarkable the amount of freshwater shrimp is our there. I trap using a single funnel #4 hardware cloth pancake trap. A can of cat food is used for bait. When the crappie are on the bank even during "Lock Jaw" days you drop a live prawn in the water the crappie fight to get to it. I am in the same situation as posters above, I catch more than I need but when I started I used grass shrimp on my jigs. It worked great for me. When setting a shrimp trap the funnel always is on the down stream end of the trap. Once mature the shrimp "March" up and down river with the tides here. If you want to keep some in long term storage you have to provide something for the shrimp to crawl on to get out of the water. Big prawns do catch everything. A Fish Buffet!