These two terms get used almost interchangeably online, which causes more confusion than it should. They're related, they're often done in the same few minutes on the same fish, but they're not the same thing. Understanding the difference is the key to actually getting the eating-quality benefits everyone talks about.
Iki jime: the dispatch
Iki jime (also written ike jime) refers to the initial dispatch — inserting a spike into the fish's brain to end its life quickly. This is the step most people mean when they talk about "iki jime-ing" a fish, and it's the one the Original IkiPik is built for.
Done well, iki jime is fast and decisive. One firm, confident motion into the brain, and the fish stops fighting almost immediately. That's the whole point — no prolonged stress, no thrashing, no wasted energy burning through the fish's muscle tissue.
Shinkei jime: the follow-up
Shinkei jime is the next step, and it's where a lot of home anglers stop short — not because it's difficult, but because most people have never been shown how, or don't have the right tools on hand.
Shinkei jime means destroying the spinal cord, usually by running a wire down the spinal column from the point of dispatch (or from a cut near the tail, depending on technique and species). The idea is to stop the nervous system from continuing to send signals to the muscle tissue after the fish has died. Left alone, those residual nerve signals can cause the flesh to twitch and contract for some time after death — which, again, uses up the fish's stored energy and can affect texture.
Shinkei jime is typically done alongside bleeding the fish (cutting the gills or a major vessel and letting it bleed out in clean water or on ice), which removes blood from the flesh before it has a chance to affect flavour or shelf life.
Why the order and combination matters
Think of it as a short sequence rather than one single action:
- Dispatch — iki jime, spike to the brain, ends suffering and stops the fight immediately.
- Bleed — cut the gills or a major blood vessel to let blood drain from the flesh.
- Destroy the spinal cord — shinkei jime, wire down the spine to stop residual nerve activity.
- Chill — get the fish onto ice or into an ice slurry as soon as practical.
Each step builds on the last. Skipping straight to icing a fish that hasn't been properly dispatched, bled and wired misses most of the quality benefit — the fish may look the same in the esky, but the flesh won't hold up the same way over the following days.
What's actually in the kit, and why
This is exactly why the six-piece Iki Jime / Shinkei Jime Kit is built the way it is — each tool corresponds to a step in the sequence, not just a nice-to-have extra:
- IkiPik spike with bottle opener and lanyard — the initial dispatch.
- T-piece coring tool with 360-degree action — for accessing the spinal column cleanly.
- Tuna blood knife — for bleeding larger species efficiently.
- Six-inch stainless-steel utility knife — general-purpose cutting and cleaning.
- Two spinal-wire gauges — sized for different species, for the shinkei jime step itself.
- Washable storage bag — because a kit that lives loose in a tackle box doesn't get used properly.
If you're only ever dealing with smaller fish for a quick feed, the Original IkiPik on its own covers the dispatch step, which is still a major step up from no method at all. If you're regularly bringing home larger fish, or you want the full process from dispatch through to bleeding and chilling, the complete kit is worth having on board.
A note on getting it right
Shinkei jime in particular takes a little more practice than iki jime — locating and following the spinal column isn't always obvious the first few times. It's worth watching a demonstration or two and practising on a fish you're not in a rush to plate up, rather than trying to learn the technique for the first time on a prize catch with the barbecue already heating up.
As always: use sharp tools with care, keep them away from children, and fish within your local rules and bag limits.
Explore the full range in the Blog section, or head straight to the Iki Jime / Shinkei Jime Kit to get set up properly.