Ympyräkoukku

Ympyräkoukku, known in English as the circle hook, is a fishing hook characterized by a circular bend and a point that curves back toward the shank. This design promotes mouth-hooking of fish when the line is tightened after a bite, rather than a deep or gut hook.

Design and mechanism: The curved shape causes the point to settle in the corner of the mouth as the line comes under tension. This makes the hook more likely to lodge in the lip or mouth rather than penetrate deeper tissues.

Advantages and use: Circle hooks reduce the likelihood of deep hooking, which can improve fish survival in catch-and-release scenarios. They are widely used in both freshwater and saltwater fishing and are compatible with live bait, cut bait, and artificial baits. They can be easier to unhook and handle when releasing fish.

Practical considerations: They come in a range of sizes and materials and are available from most tackle suppliers. The choice of size depends on the target species and bait. Some guides advise a more gradual, inbound hookset rather than a hard, jerking strike.

Regulation and adoption: Circle hooks have been promoted by fisheries agencies in various regions to reduce bycatch and injury. Local rules may require or encourage circle hooks for certain species, gear types, or fishing grounds, so anglers should consult regional regulations.