An indicator in fishing is a device or method used to detect when a fish has taken the bait or lure underwater. Indicators serve a similar purpose to bobbers but are often more subtle and sensitive, especially in fly fishing contexts. In fly fishing, an indicator is typically a small, buoyant object attached to the leader or tippet above the fly. It may be a small, brightly colored float, a piece of yarn, or even a specially designed indicator made of foam or plastic. The indicator helps the angler monitor the movement of the fly underwater and detect when a fish has taken it. When fishing with an indicator in fly fishing, the angler casts the fly and indicator onto the water's surface. The indicator floats on the surface while the fly sinks beneath it. When a fish strikes the fly and takes it underwater, the angler sees a subtle movement or twitch in the indicator, signaling a bite. At that moment, the angler sets the hook to secure the fish. Indicators are particularly useful in fly fishing situations where the water is fast-moving, deep, or turbulent, making it difficult to see strikes directly. They allow anglers to fish more effectively in these conditions by providing a visual cue to indicate when to set the hook.

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