There are a couple different ways that you can keep worms on a barbless hook. The first way is to simply use a small piece of worm as bait. This method works well if you are fishing for smaller fish, such as panfish or trout. Another way to keep worms on a barbless hook is to use a rubber band. Simply stretch the rubber band over the top of the hook, and then thread the worm through the center of the band. This method works well for larger fish, such as bass or catfish.