What ikejime is and why it works
Ikejime is a Japanese method for killing a fish the moment it comes aboard, and the name says it: it translates as "live killing." A spike goes into the brain for instant brain death, the fish is bled, a wire destroys the spinal cord, and the fish goes straight into an ice slurry. Spike, bleed, wire, ice.
The point is what it prevents. A fish left to suffocate on the deck or in the cooler floods its muscles with stress hormones like cortisol and adrenaline, and builds up lactic acid as it thrashes. All of that costs you flavor and texture on the plate. Spiking stops it at once, bleeding removes the blood that feeds bacteria, and destroying the spinal cord stops the muscle twitching that pushes the fish into rigor mortis early.
The payoff is fish that keeps its quality longer, with firmer flesh, a milder smell and less gaping in the fillet. It's also a far quicker, more humane end than suffocation for any fish you're keeping.
What you need
A spike to reach the brain, a sharp knife to bleed the fish, a wire long enough to run the length of the spinal cord, and enough ice and water to submerge the fish completely. Wear gloves: a spike, a knife and a fish whose muscles can still kick make for easy injuries.
Our IKEJIME PRO KIT puts the spike, the knife and the wire in one case.
IKEJIME PRO KIT
- Stainless steel brain spike on a T-handle, with a lanyard.
- Bleeding knife with its own sheath.
- Shinkei jime wire for the spinal cord.
- Zip case that keeps the set together on the boat.
To work on the deck, our Fishy Mat gives you a non-slip surface with a measuring scale up to 15 inches and two magnets to hold your tools. You'll find both in our ikejime tools.
Spike the brain
Do it as soon as the fish is landed. Every minute it spends suffocating is stress going into the meat.
On most fish the brain sits a little behind and above the eye. A good reference is the curved bone in front of the gill plate, the pre-operculum: where its top meets the lateral line is close to the spot. The exact position changes from species to species, so check before you spike something new.
Drive the spike in firmly. When you hit the brain, the fish reacts once: the mouth opens, the fins flare, and then it goes still. If you don't see that reaction, you haven't found the brain yet.
Bleed it out
With the brain gone, the heart keeps beating for a while, and that works in your favor: it pumps the blood out for you. Cut the membrane behind the gills on both sides, then make a second cut at the base of the tail, down to the spine.
Then let the fish bleed in water. A bucket or a running livewell keeps the blood flowing out instead of clotting in the cuts.
Run the wire
This is shinkei jime, the step that separates good fish from great fish. Plenty of anglers already spike and bleed; fewer run the wire. Even with the brain destroyed, the spinal cord keeps firing signals to the muscles, and those twitches burn the energy the meat needs to stay in top shape and bring rigor mortis on sooner.
Look at the tail cut and find the neural canal, a small hole just above the spine. Feed the wire into it and push it up toward the head, all the way to the brain. Then work it back and forth a few times to destroy the cord. When it's done, the remaining movement stops. You can also run the wire from the head, through the hole left by the spike.
Ice it down
Last step: get the heat out of the fish fast. Loose ice piled on top isn't enough. Submerge the fish completely in a slurry of roughly equal parts ice and water, ideally seawater, so the whole body cools quickly and evenly.
Keep it there, cold, until you're back at the dock or in the kitchen, and fillet it once it's fully chilled.
Mistakes that ruin it
- Waiting to spike. A fish flapping on the deck is stressing its own meat. Spike first, everything else after.
- Missing the brain. No open mouth, no fin flare, no stillness: you haven't hit it. Re-aim a little behind and above the eye.
- Skipping the bleed. Blood left in the fish feeds bacteria. Cut the gills and the tail, then let it bleed in water.
- Stopping the wire short. The cord has to be destroyed along its length, tail to brain. A wire that stops halfway leaves part of it firing.
- Icing without water. Ice on top chills the skin, not the fish. Submerge it in slurry.
