Circle hook

Difference between a traditional J-hook (left) and a circle hook (right)
Traditional Māori bone matau, or fishhook. The shape avoids stress concentrations which could break the bone. The hole on the underside is for attaching bait.

A circle hook is a type of fish hook which is sharply curved back in a circular shape. The hook is designed to slide out of the throat and rotate into the corner of the fish's mouth, which often results in hooking the jaw or lip of the fish during the hook-set. This design lowers the mortality rates of released fish compared to J-hook (like O'Shaughnessy or Octopus hooks) which are often swallowed and can damage the gills or vital organs.

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