Ragworm and Lugworms - sea fish love them. This ragworm fly makes a superb worm imitation for saltwater fly fishing in the UK. It will catch most species of fish but we love bouncing these flies close to the bottom in sandy gullies catching flatfish. The size 6 stinger hook is small enough to hook flatties. In Europe these flies are uses to target sea trout as they feed on migrating ragworms.