What hooks the fish?

Answer 1

There are two main types of hook - the J hook and the circle hook. J hooks are used by directly driving the hook through the bait and into the fish with a strong upward tug. The hook can end up anywhere from the stomach of the fish to the jaw or be snagged on the exterior of the fish.

Circle hooks are swallowed by the fish and are set by winding the line tight. The shape of the hook causes the point to swing around the jaw. Typically, 95% of the hook sets are in the fish's jaw. This allows the fish to be released relatively unharmed. Circle hooks are used very successfully in deep water fishing.