
Williamson Koika Jig
The Williamson Koika Jig uses an asymmetric keel design that creates a perfect fluttering action on the fall. The slow, erratic descent simulates distressed baitfish, triggering strikes from tuna, mahi, snapper, grouper, and triggerfish. Multiple sizes and colors cover depths from nearshore reefs to deep offshore structure. From $12.79.
- Asymmetric keel for natural fluttering fall
- Simulates distressed prey with erratic flash
- Multiple sizes and colors
- Works nearshore reefs to deep offshore structure
The Flutter Fall That Triggers Reflex Strikes
Most jigs sink straight down like a rock. The Koika's asymmetric keel causes it to flutter and flash erratically on the fall, which is when most strikes happen. Fish see what looks like a dying baitfish spiraling through the water column and they react before thinking.
The keel design also means the jig does not require aggressive rod work to produce action. Drop it, let it flutter, jig it back up, repeat. This slower approach saves energy on long days and produces strikes from fish that ignore faster, more aggressive presentations.
The keel design also means the jig does not require aggressive rod work to produce action. Drop it, let it flutter, jig it back up, repeat. This slower approach saves energy on long days and produces strikes from fish that ignore faster, more aggressive presentations.
Asymmetric Keel Design
The offset weight distribution causes the jig to flutter and spiral on the drop. This erratic fall triggers reflex strikes from predator fish at all depths.
Versatile Species Range
Blackfin tuna, yellowfin tuna, mahi, amberjack, snapper, grouper, and triggerfish all eat this jig. Drop it on any structure and something will bite.
Multiple Sizes
Light versions for nearshore reefs and heavy versions for deep structure. Size up for depth and current, size down for finesse presentations.
How to Fish the Williamson Koika Jig
1. Select jig weight based on depth and current
2. Drop the jig to the bottom or target depth
3. Let the jig flutter on a controlled descent
4. Jig with slow, rhythmic rod lifts
5. Most strikes happen on the fall, so stay alert during the drop
6. Keep tension on the line and set the hook on any change in weight
Specs & Common Questions
Everything you need to know before you buy
Full Specifications +
| Brand | Williamson |
| Design | Asymmetric keel |
| Action | Flutter/slow pitch |
| Target Species | Tuna, mahi, snapper, grouper |
| Sizes | Multiple weights available |
| Price | From $12.79 |
What species does this jig catch? +
Tuna, mahi, snapper, grouper, amberjack, triggerfish, and sea bass. See our jigging guide.
What size should I use? +
Match jig weight to depth and current. Heavier for deeper water, lighter for shallow reefs. Our jigging guide covers selection.
Do I need to add an assist hook? +
The Koika comes with hooks. You can add assist hooks for additional hookup insurance. Browse all jigs.
Is this a slow pitch jig? +
Yes. The flutter action works best with slow pitch jigging technique. Our tuna jigging guide covers the method.
What rod and reel setup do I need? +
A medium-heavy spinning or conventional setup with braided line. See our jigging guide for gear recommendations.
How deep can I fish this? +
Effective from 50 to 300+ feet depending on jig weight. Heavier sizes reach deep structure. Browse all jigs.



