How to Rig a Dredge for Trolling - Setup, Arms, and What Fish It Pulls

A dredge is the most effective teaser in offshore fishing. It simulates a school of baitfish swimming below the surface, and it pulls game fish into your trolling spread from hundreds of yards away. Marlin, tuna, mahi, and sailfish all respond to dredges because the visual of a dense bait ball triggers their predatory instinct.

But dredges are heavy, awkward, and unforgiving if you rig them wrong. A poorly deployed dredge tangles in your spread, fouls your outrigger lines, or breaks free and takes $200 worth of gear with it. Here's how to rig one right.

What Does a Dredge Actually Do for Your Trolling Spread?

A dredge serves one purpose: attraction. It doesn't carry hooks. It's a teaser that makes your trolling spread look like a feeding event instead of a collection of individual lures.

Fish see the dredge first because it's the largest visual in the spread. A 16-squid dredge like the Epic Compact Squid Dredge presents a tight ball of baitfish shapes swimming 15-30 feet below the surface. From a distance, it looks like a school of squid or ballyhoo being chased, which is exactly what billfish, tuna, and mahi are looking for.

The dredge pulls fish into the spread. Once they arrive and investigate the dredge (which has no hooks), they encounter your actual lures and baits trailing behind the boat at their level. The dredge is the setup. Your lures are the close.

Tournament boats run dredges on both sides because the visual mass is the single biggest advantage you can add to a spread. An Epic Compact Phat Squid Dredge on each side, plus a spreader bar or two, creates the illusion of a massive bait event.

How to Rig a Dredge: Arms, Bait, and Tow Point

The arm structure: Most dredges use a center bar (the arm) with multiple drop lines hanging from it. Each drop line holds 2-4 squid or bait shapes. A standard 4-arm dredge has 4 horizontal bars stacked vertically, each with 4 drops, giving you 16 bait shapes total.

The Epic Compact Squid Dredge uses this layout. The squid bodies are pre-rigged on the drops, so setup is straightforward.

Rigging the tow point: The tow point is the single connection between the dredge and your boat or tow cable.

1. Run a heavy tow cable from a cleat, rod holder, or downrigger. Use 200-400 lb cable or heavy mono (200+ lb).

2. Connect the tow cable to the dredge arm with an Epic Dredge Connector Cable or heavy ball bearing snap swivel.

3. Attach a dredge weight between the tow cable and the dredge arm. This is what pulls the dredge down.

4. Use Fast Clips dredge snaps for quick connection and disconnection. When a fish is on, you want the dredge out of the water fast.

Tow cable options: Some boats tow from a dedicated dredge rod and reel. Others use hand-crank or electric reels mounted low on the gunwale. Electric retrieval is worth the investment for boats running dredges daily.

Bait loading: Pre-rigged squid dredges ship ready to fish. For natural bait dredges, thread ballyhoo or squid onto drop hooks. Natural bait adds scent but washes out at trolling speed. Most tournament boats run artificial dredges because they last all day.

Use Dredge Dawg Swivels at the connection between the tow cable and the dredge arm. Standard swivels can't handle the rotational forces from a dredge dragging at trolling speed.

How Deep Does a Dredge Run, and How Do You Control Depth?

Dredge depth depends on four factors: weight, tow speed, tow cable length, and current.

Weight is the primary depth control. A 12 oz dredge weight gets a standard squid dredge to roughly 10-15 feet at 6 knots. A 24 oz weight pushes it to 15-25 feet. Heavier weights (2-3 lb) reach 25-35 feet but create significant drag that loads the tow cable and the cleat.

Tow cable length matters. More cable out means more depth, but also more drag and more distance from the boat. Most setups run 30-75 feet of tow cable. Too short and the dredge rides too close to the surface in the boat's wake. Too long and retrieving it becomes a wrestling match.

Speed affects depth inversely. Faster speeds create more lift and push the dredge up. At 5 knots, a 16 oz weight holds a dredge at 20 feet. At 8 knots, the same weight might only get 12-15 feet.

Practical depth targets:

Target Depth	Weight	Cable Length	Speed
10-15 ft	12 oz	30-40 ft	6-7 knots
15-25 ft	24 oz	40-60 ft	5-7 knots
25-35 ft	32-48 oz	50-75 ft	4-6 knots

You want the dredge deep enough to be visible from a distance but not so deep that it tangles with your deeper trolling lines. For most spread setups, 15-25 feet is the sweet spot. That keeps the dredge below the surface chop but above the depth where your weighted lures are running.

What Species Respond Best to Dredges?

White marlin and sailfish are the most dredge-responsive species. They're sight feeders that cover enormous distances looking for bait concentrations. A dredge visible at 100+ yards pulls them into range. Tournament captains in Hatteras, Morehead City, and down the southeast coast consider dredges essential for billfish.

Yellowfin and bluefin tuna respond to dredges, especially when combined with chunking or live bait. The dredge simulates the bait school, and tuna follow it into the spread. In the Hatteras offshore canyons, boats running dredges consistently raise more tuna than those without.

Mahi (dolphin) are naturally curious and attracted to anything on the surface or subsurface. A dredge pulls mahi from hundreds of yards, and once they find the spread, they stay in the zone. Pair dredges with daisy chains and spreader bars for maximum mahi attraction.

Wahoo occasionally respond to dredges, but they're primarily speed-triggered fish. A dredge running at 6-8 knots in wahoo territory is more of a bonus than a strategy. Wahoo-specific trolling at 12-18 knots is too fast for most dredge setups.

Blue marlin absolutely respond to dredges. The larger visual footprint of a dredge is proportional to the size of the fish it attracts. Big dredges pull big fish.

Dredge Mistakes That Kill Your Spread or Break Your Gear

Running the dredge too shallow. A dredge bouncing in the surface wash doesn't look like a bait school. It looks like junk being dragged. Get it down at least 10 feet below the surface so it swims cleanly.

Weak tow cable connections. The tow cable sees sustained loads of 50-100+ lb from drag at trolling speed. A snap swivel rated for 75 lb fails here. Use ball bearing snap swivels rated at 200+ lb and cable rated at 300+ lb. A broken tow cable means losing the dredge entirely.

No retrieval plan. When a fish is on, the dredge needs to come out of the water. If you're hand-pulling 75 feet of cable with a 24 oz weight and a soaked dredge, you'll quickly understand why electric or reel retrieval exists. Plan the retrieval before deployment.

Towing from the wrong point. Tow from the lowest point you can safely manage, usually a low gunwale cleat. High tow points lift the dredge and put bad angles on the cable.

Not storing properly. Rinse with fresh water and store in a dredge storage bag with arms organized. Tangled squid arms cost you 30 minutes next trip.

Running too many lines around the dredge. Keep trolling lines outboard of dredge cables to prevent tangles during turns or fish runs.

For a detailed breakdown of dredge hardware and retrieval systems, see our dredge setup hardware guide. For building a complete mahi trolling spread with dredges and teasers, check the mahi spread guide. And for wahoo-specific trolling setups that complement dredge spreads, see the wahoo trolling spread guide.

FAQ

How heavy should a dredge weight be?

12 oz for shallow running (10-15 feet) at 6-7 knots. 24 oz for mid-depth (15-25 feet). 32-48 oz for deeper running at slower speeds. More weight means more depth but more drag on the tow cable.

Do dredges have hooks?

No. Dredges are teasers that attract fish into your trolling spread. The fish that investigate the dredge then encounter your hooked lures and baits. Some anglers add a single hook to the center of the dredge, but this is illegal in some tournaments and not standard practice.

How far behind the boat should a dredge run?

30-75 feet of tow cable. Too short and the dredge rides in the prop wash. Too long and retrieval becomes difficult. 40-60 feet is the sweet spot for most setups.

Can I run a dredge from a small boat?

Boats under 25 feet can run small dredges, but the drag load is significant. A compact 8-squid dredge with a 12 oz weight is manageable. Full 16-squid dredges create enough drag that they can affect boat speed and handling on smaller hulls.

What's the difference between a dredge and a spreader bar?

A dredge runs subsurface (10-30 feet deep) and simulates a bait school below the boat. A spreader bar runs on or near the surface and simulates bait skipping on top. They complement each other. Run both for maximum coverage of the water column.