Fish hook with some form of corrosion-resistant surface coating. Corrosion resistance is required not only when hooks are used, especially in saltwater, but while they are stored. Additionally, coatings are applied to color and/or provide aesthetic value to the hook. At a minimum, hooks designed for freshwater use are coated with a clear lacquer, but hooks are also coated with gold, nickel, Teflon, tin and different colors. There are a large number of different types of fish hooks. At the macro level, there are bait hooks, fly hooks and lure hooks. Within these broad categories there are wide varieties of hook types
Fly tying call them Wulffs and he started tying them under that name— Lee Wulff in the tribute in "Mist on the River-Remembrances of Dan Bailey". The typical fly pattern appears something like one of the illustrative patterns below for the "Adams dry fly" (without tying instructions) or the Clouser Deep Minnow (with tying instructions). Based on the fly pattern, a knowledgeable fly tyer can reproduce the fly with the materials specified. Historically, fly pattern types have evolved along with fly fishing itself and today there are generally recognized pattern types. However, none are absolute, as there is much crossover in patterns