Britannica Sources used in this answer

How does fly-fishing cast a nearly weightless artificial fly?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

In fly-fishing, the nearly weightless artificial fly is cast by utilizing the mass of the line rather than the weight of the lure itself.12

The process relies on a specialized, heavy, plastic-coated line that is attached to a lighter nylon leader. By snapping the long fly rod back and forth, the angler uses the rod to generate momentum, allowing the heavier weight of the line to propel the fly forward through the air. This technique is essential because the fly—constructed from hair, feathers, or synthetic materials—is too light to be cast on its own. The goal is to have the fly land as gently as possible on the water to avoid startling the fish.12