Rig guide
Fish-Finder Rig for Surf and Inshore Bait Fishing
A fish-finder rig lets the main line slide through the sinker, so a fish can pick up the bait and move off without feeling the weight. It is the usual bottom rig for bigger baits in the surf: cut bait, chunks or live fish for striped bass, red drum and bluefish.
To build one, thread a sinker slide and a bead onto the main line, then tie on a barrel swivel. Add a leader and a circle hook, and clip a pyramid sinker to the slide. In small or moderate surf, a 2–3 oz pyramid should hold the bottom. Rough surf can take 6–8 oz. Check local rules first: on summer nights North Carolina requires a fixed sinker instead in a defined area of Pamlico Sound and its tributaries.
How a fish-finder rig goes together
Original illustration of a fish-finder rig. The line runs freely through the sinker slide; the swivel stops the slide and the bead keeps it off the knot. Not to scale.
- Sinker slide. A small plastic sleeve that runs on the main line, with a clip for the sinker. The line slides through it, and you can change the sinker's weight or shape without retying.
- Bead. Sits between the slide and the swivel so the slide does not rub on the knot.
- Barrel swivel. Stops the slide and joins the main line to the leader. Use a swivel wider than the slide's hole, or it can jam inside.
- Leader. Monofilament or fluorocarbon, heavier near rocks and pier pilings. Length and strength depend on the fish and how far you need to cast (see below).
- Circle hook. Sized to the bait. Some rules require one, and it is the right hook for a rod left in a holder.
A sliding egg sinker with a bead and swivel below it is the simplest version of the same rig.
Leader and hook for each fish
A short leader casts farther and is less likely to spin and tangle in the air. Once the sinker lands, the current moves the bait away from it, so even a short leader leaves the bait free. Go longer when the fish are close.
Scroll the table sideways to see every column.
| Fish | Leader | Hook | Published by |
|---|---|---|---|
| Striped bass | As short as 6 in for long casts; 24–30 in when fish are close | Inline circle, 7/0–8/0 for large baits; 8/0–9/0 with bunker chunks | On The Water; Take Me Fishing |
| Red drum | 6–8 in is common in the surf; South Carolina DNR uses 50 lb mono | 6/0 with cut bait for 20–30 lb fish, as a circle hook where the rules require one; North Carolina DMF's red drum rig uses a 4/0 or larger circle | Field & Stream; South Carolina DNR; North Carolina DMF |
| Bluefish | Wire for big bluefish, to prevent bite-offs | Inline circle, 8/0–9/0 | On The Water |
| Summer flounder (fluke) | About 30 in of fluorocarbon so the bait can flutter | No fish-finder-specific size found | On The Water |
Published starting points. Hook sizes vary by maker, so check the gap against your bait.
Massachusetts DMF says inline circle hooks of 7/0 to 10/0 generally suit striped bass in the recreational slot, since sizes vary between makers. The 7/0–8/0 on the surf hook size guide sits inside that range. For leader strength, Take Me Fishing suggests carrying 20, 30, 40 and 50 lb, and using the heavier ones around rocky shorelines and pier pilings.
Which sinker, and how heavy?
- Pyramid. The most common surf sinker. Its point digs into sand and its flat sides resist rolling. It can pop out and roll in heavy surf, and it snags on rocky bottoms.
- Sputnik or spider. Wire legs dig into the sand and hold better with big baits that catch the waves, but the wires can foul the rig.
- Wedge and Hatteras (storm) sinkers. On The Water's top choice for big baits in strong surf is the wedge, with the Hatteras holding better than a pyramid but not as well as a wedge.
- Bank. Rolls with waves and current, so it is a poor choice when the bait must stay put. Over rocks, its round shape is less likely to wedge.
For weight, South Carolina DNR says a 2–3 oz pyramid should hold in small or moderate surf, and 6–8 oz may be needed in rough surf or a strong longshore current. Carry several and use no more than it takes to hold. On The Water finds a sinker slide fine up to about 5 oz. For heavier weights it uses a snap swivel between two beads instead. Check that your rod is rated to cast the weight you choose. The sinker size chart lists the shapes by weight.
How to fish it
Two surf rods set upright at the water's edge, with the reels held well clear of the breaking waves.
- Bait the circle hook so the point stays clear of the bait. Fresh cut bait stays on better than frozen, and salting it toughens it against small fish.
- Cast with a smooth lob, which keeps the slide and sinker against the swivel until they hit the water.
- Let the sinker settle, take up the slack and set the rod in a sand spike or holder. A tall spike keeps the line above the waves. If you fish two rods, cast them different distances.
- Set the drag light enough that a fish can take line while the rod is in the holder.
- When the rod loads, don't jerk it. Lift the rod and reel steadily so the line comes tight, and the circle hook turns into the corner of the jaw. A hard hookset pulls a circle hook out of the fish's mouth.
Rules that change the rig
- Striped bass, Maine to North Carolina. The interstate plan requires non-offset (inline) circle hooks when fishing for striped bass with natural bait, from shore or from a boat. Lures with bait attached are exempt.
- South Carolina, from July 1, 2026. For red drum, spotted seatrout, cobia, tarpon and billfish, natural bait on a 4/0 or larger hook must go on a non-offset, non-stainless circle hook.
- North Carolina, Pamlico Sound area. The rule covers the internal coastal waters of Pamlico Sound and its tributaries south of the Albemarle Sound Management Area and north of a line from Camp Point to Core Banks. There, from July 1 to September 30, between 7 p.m. and 7 a.m., natural bait on any hook larger than 4/0 must be fished on a circle hook with the barb pinched down or removed, and a fixed sinker of at least 2 oz no more than 6 in from the hook. A sliding fish-finder rig does not meet that rule. North Carolina says the short leader and fixed weight reduce deep hooking of red drum.
These are the rules found for this guide, not a complete list. Rules change, and other states set their own. Check your state agency's current regulations before you fish.
Common fish-finder rig problems
- The rig tangles on the cast. A long leader spins (helicopters) in the air. Shorten it.
- The swivel jams in the slide. Use a swivel larger than the slide's hole. With braid, check the slide now and then, because braid can wear a groove in the plastic.
- The bait drags down the beach. Go heavier, or switch to a sinker that grips, such as a sputnik or wedge.
- The bait keeps coming off. Use fresh bait rather than frozen, and salt cut bait to toughen it.
- Shorter casts than with a fixed sinker. The sinker can slide up the line during the cast. A smooth lob helps. The author of South Carolina DNR's 1992 surf guide used a fixed sinker for longer casts and fewer tangles, while noting that some of the best surf anglers he knew used only the fish-finder. Both rigs catch fish.
For two small baits on one line, use a high-low rig. For line twist, knots and other tackle faults, see fishing setup problems.
Related guides
- Hook size for surf fishingCircle hook sizes for redfish and striped bass by bait.
- Striped bass gear and setupsBait and bucktail setups, and the circle-hook rule.
- Redfish gear and setupsPopping cork, spoons and bottom baits for bull reds.
- Carolina rigThe freshwater version: a sliding weight and leader with a soft plastic for bass.