Killing the fish quickly and immediately after capture delays the rigor mortis process when compared to fish that are left to die by slower methods such as bleeding-out or chilling. With the complete destruction of the brain and, in particular, the hind brain, there is no movement from the fish and therefore any energy remaining in the muscle tissue is used to maintain cellular metabolism post mortem. This delays the rigor mortis process and also the degradation of the tissue. It results in a far superior quality flesh to conventional methods, where the energy reserves are depleted very shortly after capture.
The Iki Jime tool is made of durable materials and has been specifically designed so that the curve of the metal spike follows the natural line of the brain canal. This ensures that the Iki Jime procedure can be completed with one swift easy movement. For immediate death it is important to ensure that the brain has been ablated and not just severely injured.
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