Greg Cimms Knives 5-1/4" Ikejime Fish SpikeHey Everyone! My GC Ikejime fish spike is a purpose build tool to instantly destroy the fish's brain. With tuna fish in particular this is extremely important. Just like deer hunting you want to dispatch your kill as quickly and humanly as possible. This will prevent stress hormones from entering the meat giving it an off or "fishy" taste and smell. It will also prevent the tuna from freaking out and flapping on the deck for up to 15 minutes which