In truth, there are really countless different lures or flies used in the fly fishing world. However, they usually fall into three broad categories. The first category is called dry flies. They’re designed to float on top of the water. Nymphs are designed to sink below the surface, where most of the fish eat. Streamers, like nymphs, are designed to break the surface of the water, but they are also designed to act like smaller fish darting around. It’s a good idea to have a few of each type available since what works in one fishing hole or with one type of fish won’t necessarily work in another.