The Yamamoto Senko is a soft plastic stick bait: a plain, tapered cylinder of salt-impregnated plastic, five inches long, with no tail, no claws and no action of its own. It is also, by most accounts, the best-selling and most-copied bass bait of the last thirty years, and the reason is what it does on a slack line. Gary Yamamoto designed it in the mid-1990s to fall flat, horizontally, with a slow side-to-side shimmy that he describes as “a continual vibration”, and bass eat it on the fall. Below: why the design works, the six ways to rig it with the hook, weight and situation for each, the tackle Yamamoto himself uses, and the retrieve, which is mostly waiting.
A five-inch Senko takes about ten seconds to fall five feet, shimmying all the way down. Most bites come on that first fall, and the angler’s job is to watch the line.
What you need
- Senkos, 5 in (13 cm) for most water and 4 in (10 cm) for very clear water; green pumpkin and watermelon are the colours Yamamoto names, with salt-and-pepper as his “forgotten color”. Any soft stick bait fishes the same way; Zoom’s Fluke Stick, Strike King’s Ocho and YUM’s Dinger are the common alternatives.
- Hooks: a 3/0–4/0 extra-wide-gap worm hook for Texas rigging, a #1–#2 wacky or Neko hook, a #1–1/0 drop-shot hook. The hooks hub covers the shapes.
- O-rings and the tool that stretches them over the bait, for wacky and Neko rigs; they save a bait per fish.
- Weights as the rig requires: 1/8–1/4 oz (4–7 g) bullet weights, 1/16–1/8 oz (2–4 g) nail weights, 1/4 oz (7 g) drop-shot weights.
- Yamamoto’s tackle: a 7 ft light spinning rod, a 2500 reel, 10–15 lb braid to a 6–14 lb fluorocarbon leader depending on water clarity. A 7 ft medium casting rod and 12–15 lb fluorocarbon for the weighted Texas rig. The rods and line hubs explain.
Why it works
Yamamoto started with a soft jerkbait in mind, found the Slug-Go “too rigid and oversized”, and made something softer and heavier. The salt is the design: soft plastics are plastisol, and adding salt makes the bait denser, so a Senko sinks without a weight, but slowly, and falls level rather than nose-first the way a weighted worm does. As it sinks, the two ends flex and the bait shimmies. Rigged weightless on a Texas rig, Yamamoto says, “it has a continual vibration” all the way down, and the bait stays in the strike zone longer than anything with a weight on it. The other effect of the salt is that a Senko tears easily and lasts a few fish; the O-ring on a wacky rig, and the alternatives moulded from tougher plastics, exist for that reason.
The six rigs
| Rig | Hook | Weight | When | How |
|---|---|---|---|---|
| Weightless Texas | 3/0–4/0 EWG, point buried or “tex-posed” | None | Shallow cover, spawning flats, docks, grass edges, 1–8 ft (0.3–2.4 m) | Cast, let it fall on slack line, lift and drop; the original presentation |
| Wacky | #1–#2 wacky or Neko hook through an O-ring at the middle | None, or a 1/16–1/8 oz (2–4 g) weighted wacky head | Spring and pressured fish in clear water; skipping under docks | Both ends flutter on the fall; twitch, let it fall, repeat |
| Texas with a bullet weight | 3/0–4/0 EWG | 1/8–1/4 oz (4–7 g) | Deeper water, wind, cover | Fished as a Texas rig, hopped and dragged |
| Neko | #1–#2 Neko hook through an O-ring | 1/16–1/8 oz (2–4 g) nail weight in the head | Deeper clear water, smallmouth, when wacky is too slow | The bait stands on its head and quivers when shaken |
| Drop shot | #1–1/0 drop-shot hook, nose-hooked | 1/4 oz (7 g) below | Suspended fish, deep and clear | Shake in place; the Senko hovers |
| Jig head or shaky head | 1/8–3/16 oz (4–5 g) head with a 3/0–4/0 hook | In the head | Docks, laydowns, summer | Drag and shake; the tail stands up |
Yamamoto’s own way, from his Bassmaster interview: weightless Texas rig on a 3/0 Gamakatsu extra-wide-gap hook, tied with a snell knot so the line pulls from the shank rather than the eye, because “smaller light-wire hooks preserve the bait’s tail action”. The wacky rig is the most popular version among everyone else, and the wacky rig page under the jigs hub covers the O-ring and the weighted variations.
How to fish it
The Senko is fished slower than a worm. Cast to the target, let the bait fall on a semi-slack line, and watch the line where it enters the water, because most bites come on the initial fall and show as a twitch or a sideways move rather than a pull. If nothing happens, lift the rod tip to bring the bait up a foot or two, then lower it and let the bait fall again on slack line. Yamamoto’s description is a lift-and-drop like a plastic worm’s “but slower due to the lure’s gradual fall rate”; a 5 in Senko takes about ten seconds to fall five feet. Two or three lifts and a fresh cast covers more water than working one cast back to the boat. On a bite, reel until you feel weight and sweep. In Kevin VanDam’s six-season framework from the bass hub, the Senko owns the spawn and post-spawn, when bass are shallow and will not chase, and it catches fish in every other season on the rigs above; Paul Marks won the 2025 Elite Series event at Lake Hartwell on stick baits rigged three ways.
Mistakes to avoid
- Working it too much. The bait does its work on the fall. Lift, drop, wait.
- Reeling the retrieve. A steadily reeled Senko is a stick. Use the rod.
- A heavy hook. A 5/0 heavy-wire hook kills the shimmy; Yamamoto uses a 3/0.
- No O-ring on a wacky rig. The bait tears on the first fish.
- Heavy line on the weightless rig. It slows the fall and the fish see it; 10–12 lb fluorocarbon on casting gear, a 6–10 lb leader on spinning.
When to use something else
A fluke gives the same soft-plastic profile with a darting action for fish that want movement; a Ned rig or drop shot gets deeper and finer; a Texas-rigged creature bait goes into cover the weightless Senko cannot. The soft plastics hub covers the families and the jigs and rigs hub the rigs. And on the two questions that come with the name: “senko” is Japanese, chosen by Yamamoto, and is variously translated as a flash of light; it is not a person, and the optics company that shares the word has nothing to do with fishing.