How to Rig a Spreader Bar - Why It Works and How to Fish One
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A spreader bar is the simplest way to make your trolling spread look like a school of baitfish instead of a single lure swimming alone. It's a metal bar with multiple squid, flying fish, or baitfish shapes attached to short droppers. When you drag it behind the boat, it creates the illusion of 6-12 baits swimming in formation on the surface.
Tuna, mahi, billfish, and wahoo all respond to spreader bars because the visual footprint is larger than any single lure. A fish cruising 50 yards behind the boat sees a group of baits, not a solo target. That group looks like a feeding opportunity.
What Is a Spreader Bar and How Is It Different from a Dredge?
A spreader bar runs on or just below the surface. It skips, splashes, and creates commotion that mimics fleeing baitfish. A dredge runs 10-30 feet subsurface and simulates a deep bait school. They're complementary tools that cover different zones in the water column.
Key differences:
| Feature | Spreader Bar | Dredge |
|---|---|---|
| Depth | Surface to 3 ft | 10-30 ft |
| Visual | Splashing, skipping | Swimming, subsurface |
| Weight | Light (1-3 lb total) | Heavy (5-15 lb with weight) |
| Hook | Usually one stinger hook | No hooks (teaser only) |
| Retrieval | Rod and reel | Hand line or electric reel |
| Target species | Tuna, mahi, billfish | Billfish, tuna |
Most offshore boats run both. The dredge covers the subsurface column. The spreader bar covers the surface. Together with individual lures and baits, they create a complete feeding scene that pulls fish from a wider area.
A standard spreader bar uses a stainless steel bar (12-36 inches wide) with 6-12 bait shapes hanging from short droppers. One position on the bar (usually the center trailing position) carries a hook. That's the "stinger" bait that the fish eats. The rest are hookless teasers.
How to Rig a Spreader Bar: Tow Point, Spacing, and Bait
Components you need:
1. Spreader bar frame - The Epic Flying Fish Spreader Bar comes pre-built with flying fish shapes
2. Tow cable or leader - 200-300 lb mono or cable, 6-15 feet from the rod tip
3. Stinger hook - One hook on the center trailing bait, usually a 7/0-9/0 J-hook or circle hook
4. Snap swivel - Ball bearing snap swivel at the connection between tow line and the bar
5. Rod and reel - Medium-heavy trolling rod, 50 lb class conventional reel
Rigging steps:
1. Connect your fishing line to a ball bearing snap swivel rated at 150+ lb.
2. Attach 6-15 feet of 200 lb mono leader to the snap swivel.
3. Connect the leader to the tow point on the spreader bar frame using a heavy snap or dredge snap.
4. Verify the stinger hook is on the center trailing bait. This should be the bait that trails 6-12 inches behind the others.
5. Check all dropper connections for kinks, frays, or corrosion.
Spacing matters. The baits on a spreader bar should be spaced evenly across the bar width. Typical spacing is 4-6 inches between droppers. The trailing stinger bait hangs 6-12 inches behind the plane of the other baits. This offset makes the stinger look like a straggler, which is always the bait a predator targets.
Bait shapes: Flying fish, squid, and ballyhoo are the most common shapes. For tuna, squid shapes in dark colors (black/purple, dark blue) work well. For mahi, bright colors (pink, chartreuse, natural flying fish patterns) attract more attention. The 9" Octopus Skirts work as replacements for worn bait shapes on existing bars.
Spreader Bars for Tuna vs Spreader Bars for Mahi: Is There a Difference?
Yes. The setup and placement differ based on how each species feeds.
Tuna spreader bars: Tuna are subsurface feeders that come up to investigate surface commotion. Run tuna spreader bars slightly deeper, with the bar barely submerged. Darker colors (black/purple, dark blue/black) match the silhouette that tuna see from below. Position tuna bars further back in the spread (75-125 feet behind the boat) where the spread is wider and the boat wake has settled.
Yellowfin tuna off Hatteras respond particularly well to squid-shaped spreader bars with a compact squid dredge running deeper below them. The combination of surface bar plus subsurface dredge creates a column of bait that yellowfin can't ignore.
Mahi spreader bars: Mahi are surface-oriented and attracted to color, splash, and movement. Run mahi bars right on the surface where they skip and splash. Bright colors work: pink/white, chartreuse, natural flying fish. Position mahi bars closer to the boat (40-75 feet back) in the most turbulent part of the spread where the splashing is loudest.
Mahi also respond to proximity. Two spreader bars, one on each outrigger with a daisy chain running between them, creates a wall of surface activity that mahi school behind.
Billfish: White marlin and sailfish follow spreader bars into the spread the same way they follow dredges. They investigate the bar, then eat the stinger or pivot to a nearby lure. Run bars at mid-distance (60-100 feet back) where they're visible but don't interfere with the closer pitch bait or flat line lures.
How Fast Do You Troll a Spreader Bar?
Spreader bars work across a range of trolling speeds, but each species has a sweet spot.
5-7 knots: Standard trolling speed for white marlin, sailfish, and mixed offshore spread. Spreader bars skip and splash at this speed. Most offshore boats from Hatteras to Morehead City troll this range for billfish tournaments.
7-9 knots: Good for mahi and yellowfin. The higher speed creates more surface action from the bar. Mahi like aggressive surface disturbance.
4-6 knots: Slow trolling for tuna when they're finicky or when running natural bait on the stinger. The slower speed lets the bait swim more naturally.
10+ knots: Too fast for most spreader bars. At high speed, the bar lifts out of the water or submarines unpredictably. For wahoo-speed trolling (12-18 knots), skip the spreader bar and run individual wahoo lures designed for speed.
Watch the bar as you adjust speed. It should be skipping on the surface with the baits splashing and tracking straight. If it's airborne or tumbling, slow down. If it's dragging and not creating surface action, speed up.
Connect the bar to a wind-on leader if you want the connection to pass smoothly through the rod tip during a fight. Or connect it directly to piano wire leader if you're in wahoo or king mackerel territory where teeth are a concern.
How to Store and Maintain a Spreader Bar So It Doesn't Tangle
Spreader bars are tangle magnets. Six to twelve droppers with individual bait shapes, all hanging from a single bar, will twist into a hopeless knot if you throw them in a fish box.
After fishing:
1. Rinse the entire bar with fresh water while the droppers are still hanging naturally. Salt crystals on swivels and connections cause corrosion and stiffness.
2. Let it drip dry hanging, not laying flat.
3. Store in a dredge storage bag with each dropper organized. Some anglers use pool noodle sections or PVC pipe to wrap droppers around.
4. Inspect the stinger hook for sharpness and the snap for closure integrity.
5. Replace any bait shapes that are cracked, faded, or have lost their action.
Common storage mistakes:
- Throwing the bar in a bucket or tackle bag loose. Guaranteed tangle.
- Storing wet. Mildew damages soft plastic baits and corrodes hardware.
- Not inspecting between trips. A corroded snap fails at trolling speed, and you lose the whole bar.
Pre-trip checklist:
- All dropper connections secure? Check.
- Stinger hook sharp? Check.
- Snap swivel closes firmly? Check.
- Bait shapes intact (no cracks or missing tentacles)? Check.
- Tow cable/leader free of nicks and chafe? Check.
For dredge rigging that complements your spreader bars, see our dredge setup guide. For building a complete mahi trolling spread, check the mahi spread guide. And for wahoo-specific speed trolling that runs alongside spreader bar spreads, see the wahoo trolling guide.
FAQ
What is the difference between a spreader bar and a daisy chain?
A spreader bar has a rigid metal frame that spaces baits horizontally. A daisy chain strings baits along a single leader in a line. Spreader bars create a wider visual footprint. Daisy chains are simpler, lighter, and easier to store.
Do spreader bars have hooks?
Usually one. The center trailing bait (the stinger) carries a hook. The rest of the baits are hookless teasers that attract fish to the spread.
How far back should I run a spreader bar?
40-125 feet behind the boat depending on species. Mahi bars run closer (40-75 feet). Tuna bars run further (75-125 feet). Billfish bars at mid-distance (60-100 feet).
Can I use a spreader bar on a small boat?
Yes. Spreader bars are lighter than dredges and can be run from a standard trolling rod. Even 20-foot center consoles can run a small spreader bar effectively.
What color spreader bar is best?
Bright colors (pink, chartreuse) for mahi. Dark colors (black/purple, dark blue) for tuna. Natural flying fish patterns work as an all-around option.