1. Stun the fish with a sharp blow to the top of the head
2. Remove the hook from the fish’s mouth
3. Spike the soft spot into the brain
4. Insert a length of rigid monofilament nylon or stainless steel wire
Stun the fish with a sharp blow to the top of the head (between the eyes) using a fish club or other blunt instrument. Alternatively, you can calm a fish down by covering its eyes with a gloved hand or a piece of cloth.
Remove the hook from the fish’s mouth.
“Locate the soft spot by running your thumb over the top of the head, between the eyes. Insert a spike into the soft spot at a 45° angle and push it down into the brain cavity. If the spike is inserted in the right place, the fish will give one last shudder (the body will quiver, the mouth will fall open and the first dorsal fin will spread) before going limp. If this does not happen, the soft spot should be spiked again.”
“Move the spike around (to destroy the brain) until the body stops moving and the jaw goes slack. Make sure you don’t push the spike
too deep as it could damage the entrance of the neural canal.”
Insert a length of rigid monofilament nylon or stainless steel wire into the brain through the hole made by the spike or the coring tool, and push it as far as possible into the neural canal to destroy the spinal cord . The fish should quiver again as the Taniguchi tool goes down the neural canal.
If using monofilament nylon, leave it in the neural canal, but cut it off to leave the last 2–3 cm emerging from the fish’s head.