Fishing Line Types: Mono, Fluorocarbon and Braid Compared

Bright green fishing line running through the tip guides of a rod, the sea behind — Photo: Jay Erickson (CC BY 2.0)

Fishing line comes in three main materials: nylon monofilament, fluorocarbon and braid. Mono stretches 25–30% and costs one to three cents a yard. Fluorocarbon stretches 10–15%, sinks and is the hardest line for a fish to see. Braid barely stretches and is 55–60% of mono’s diameter at the same strength, so match the line to how much stretch, sink and thickness your lure wants.

Twenty-pound braid is as thin as six-pound mono. Same number on the label, a little over half the diameter in your hand.

Start here

Braided fishing line: what braid is, its diameter table against mono, and why it needs a leader and backing.
Fluorocarbon vs monofilament: the two clear lines on the numbers, then a verdict technique by technique.
Monofilament fishing line: where the cheap, stretchy line still wins: topwater, trolling, bait and beginners.
Fluorocarbon fishing line: where it wins, where it loses, and how to tie it so the knot holds.
Best fishing line for bass: one setup per technique, from finesse to frogs, with the test and leader for each.

Mono, fluorocarbon or braid: how do they differ?

Every line is a trade: what one material does well, another does badly. Side by side, property by property:

Property	Monofilament	Fluorocarbon	Braid
Material	Nylon, one strand	PVDF, one strand	Woven polyethylene fibers
Stretch	25–30%	10–15%	About none
Refractive index (water 1.33, per Seaguar)	1.62	1.42	Opaque
Floats or sinks	Sinks slowly (specific gravity about 1.14)	Sinks (1.77–1.79)	Floats (0.97)
Diameter at 20 lb	0.016 in (0.41 mm)	0.016 in (0.41 mm)	0.009–0.010 in (0.23–0.25 mm)
Abrasion	Moderate	High	Low; frays on shell and rock
Memory	High	Moderate to high	None
Life on the spool	3–6 months of use	1–2 years	2–5 years
Knots	Ties easily	Wet the knot; a dry, rushed knot fails	Braid knots: Palomar, FG or double uni to a leader
Cost per yard	1–3 cents	5–15 cents	4–10 cents; about 12 cents for PowerPro
Best at	Topwater, trolling, circle-hook bait rigs, beginners	Leaders, clear water, bottom contact	Main line for casting, jigging, frogs, grass

Stretch is the row that decides most choices. It is a spring between the rod and the hook: it keeps a crankbait’s thin trebles from tearing out of a jumping bass, and it lets a catfish take a circle-hook bait against a soft line. The same spring hides a light bite, and through 80 ft or more of water it makes the bite nearly impossible to feel. That is why bottom baits went to fluorocarbon and braid, and why mono kept topwater and trolling.

Memory is the habit of keeping the coils of the spool, and it matters most on a spinning reel. A stiff line jumps off in loops and casts short. Line memory is high in mono, moderate to high in fluorocarbon and absent in braid, which is one reason braid with a short leader took over finesse spinning gear.

Which fishing line is the strongest?

At the same rating, none. A 20 lb mono, a 20 lb fluorocarbon and a 20 lb braid are all built to break at about 20 lb on a straight pull. The difference is how thick each line is for that strength, and polyethylene braid is by far the thinnest.

Tackle Village’s diameter chart, credited to Oklahoma’s wildlife department and compiled from Berkley Trilene, Big Game and Vanish and SpiderWire Stealth, puts 20 lb test at 0.016 in for mono and fluorocarbon and 0.010 in for braid. At 30 lb it is 0.020 in against braid’s 0.012, which is 60%. PowerPro’s own chart puts 20 lb braid at 0.009 in, the diameter of 6 lb mono, and 50 lb braid at that of 12 lb mono. So braid runs about 55–60% of mono’s diameter at the same test: a little over half, not a third.

That thinness is what anglers mean when they call braid the strongest line. It casts farther, cuts through wind and current, lets a crankbait dive deeper and holds more on the spool: a spool rated for 12 lb mono holds about the same yardage of 50 lb braid. Braid often breaks above its label, too. Luke Simonds of Salt Strong puts an FG knot in 10 lb PowerPro to 30 lb fluorocarbon at 17 lb or more before it breaks.

The knot is the real weak point. On the IGFA’s test machine, in Sport Fishing’s test, a plain FG knot held 73.4% of 15 lb braid’s real breaking strength (an improved FG 80.9%) and a five-wrap double uni knot 55.8%. A clinch knot slips on braid, so braid goes to the lure with a Palomar knot. The braided fishing line page has the full diameter tables, from 6 to 60 lb.

Top view of spinning reels, a rod and spools of fishing line in several colors on wooden planks

Reels and spools of line laid out on the boards. Photo: VadimVasenin / Depositphotos.

Which fishing line floats, and which sinks?

Fluorocarbon sinks, braid floats, and mono sinks slowly. The numbers are specific gravity, where water is 1.00: fluorocarbon 1.77 to 1.79 by Kureha’s measure of the resin behind Seaguar, nylon about 1.14 and the polyethylene in braid 0.97. So mono is near-neutral. It sinks so slowly that it rides close to the surface and keeps a topwater up.

On the water that decides three things:

Topwater gets mono or braid, never fluorocarbon. Matt Allen of Tactical Bassin is blunt: “fluorocarbon sinks. Use it for topwater and it will drive you insane!” The line pulls the lure’s nose down and a walking bait stops walking.
Fluorocarbon takes a crankbait deeper. Shaye Baker at Wired2Fish says 12 lb fluorocarbon on a deep diver, against 12 lb mono, “adds multiple feet to the bait’s depth range”. The same sink keeps a drop shot or a jig in touch with the bottom.
Braid floats unless it is built not to. That is one more reason to tie a fluorocarbon leader to braid for a bottom bait. A few braids are made to sink: Sunline Almight wraps its fibers around what Wired2Fish calls “a gravity fiber core”.

Close view of the guide rings on graphite rods with a spool of line and lures blurred behind

Rod guides and a spool of line. Photo: sytnik / Depositphotos.

Can fish see fishing line, and which color is best?

Fish can see every line; fluorocarbon is simply the hardest to see. The refractive index measures how much a material bends light, and Seaguar puts water at 1.33, fluorocarbon at 1.42 and nylon at 1.62. Fluorocarbon bends light most like water, so it is “virtually invisible, but not completely”, in Seaguar’s own words. Braid is opaque.

The color matters less than the material. Seaguar says the refractive index of 100% fluorocarbon is a constant, so a fluorocarbon with a slight tint is no easier to see under water than a clear one. Of red line, which is sold on the claim that it turns invisible as red light fades with depth, Seaguar offers a test: “put the red line in the water and see if it becomes harder to see.” In stained water, Mike Iaconelli writes, fish “rely less on sight and more on vibration and movement”, and mono works fine there.

So choose the main line’s color for your own eyes, and let a clear or fluorocarbon leader hide the last few feet. Hi-vis braid in pink, lime or yellow lets you see the line clearly and read depth changes. The fluorocarbon vs monofilament page has the refractive-index chart.

What pound test and line for which fishing?

Start with the fish, then the cover, then the clarity. New Jersey’s wildlife division gives the beginner’s mono baseline: 4–6 lb test for trout and panfish, 8–10 lb for bass, catfish and walleye, and 15–25 lb for pike, musky and striped bass. The experts’ setups build on it with braid and a leader.

Fishing	Main line	Leader	Why
Trout and panfish	4–6 lb mono	None	New Jersey’s range for a first rod
Bass: finesse in crystal-clear water	10 lb braid	5–8 lb fluorocarbon; 6–10 lb mono in clean water	Allen’s split; braid casts, the leader hides
Bass: Texas rigs and jigs	40–50 lb braid	12–17 lb mono (Texas rig), 15–20 lb (jig)	Power through cover; the leader takes the abrasion
Bass: crankbaits and jerkbaits	12 lb fluorocarbon, or 20 lb braid	None on fluorocarbon; 10–12 lb mono on braid	Some stretch keeps trebles pinned
Bass: frogs and punching	50–65 lb braid	None	Allen ties no leader for either; the heavy braid goes straight to the frog or punch rig
Walleye	8–10 lb mono, or Sufix 832 braid	–	Field & Stream’s walleye pick: a tight braid casts a light jig far
Catfish	20–30 lb mono or 50–65 lb braid	40–60 lb mono; 20–40 lb fluorocarbon on the Santee Cooper rig	The leader is for abrasion on the bottom, not for stealth
Pike and musky	15–25 lb mono	10–14 in (25–35 cm) of wire; 14–20 in for big fish	Teeth cut mono and braid
Inshore: redfish, speckled trout	20–30 lb braid (reds), 10–15 lb (specks)	20–30 lb fluorocarbon (reds), 12–20 lb (specks)	Oyster bars and structure; soft-mouthed trout
Surf, casting heavy lead	20–30 lb braid, or mono	Mono shock leader, 10 lb per oz of sinker	The leader takes the force of the cast
Trolling	Mono, or braid with a long mono top shot	Mono	Stretch absorbs the strike at speed

The bass rows are Matt Allen’s setups at Tactical Bassin, and the best fishing line for bass page turns them into one line per rod. The catfish rigs show where the catfish leader goes. In the surf, the rule is simple arithmetic: a 5 oz sinker wants a 50 lb shock leader.

Buy braid by diameter, not by the number you would buy in mono. A 20 lb braid on a finesse reel casts like 6 lb mono and holds like 20 lb. So set the drag for the weakest part, not the label: 20–30% of the lightest component’s rating, by The Tackle Room’s rule. Braid wants it lighter still, because it digs into itself on the spool under load.

Which line for a spinning reel, a baitcaster or a spincast?

The reel narrows the choice before the fish does. A spinning reel spills line off the end of the spool in coils, so it wants a limp line: light mono, or braid with a fluorocarbon leader. Stiff, coily line is the trouble on spinning gear, which is one reason finesse anglers spool braid and keep fluorocarbon for the leader. Cold makes mono coil worse; on the ice, fluorocarbon has the edge, because it absorbs very little water and stays “soft and supple”, in Seaguar’s words.

Two hands working a knot in clear monofilament line over open water, a rod in the background

Working a knot in fishing line by the water. Photo: StoryTime Studio / Depositphotos.

A baitcaster turns the whole spool, so stiffness matters less. Straight fluorocarbon is a bottom-bait main line there: Sealock casts Texas-rigged worms and football jigs on Seaguar’s R18. Braid goes on heavier on a casting reel, because thin braid digs into the wraps beneath it under load. A spincast reel, the push-button reel on most kids’ rods, wants mono; Zebco warns that “braided line may not work with spincast reels.”

The numbers on the gear are mono numbers. Oklahoma’s wildlife department points out that reel capacities and rod line ratings were set when most anglers fished mono. By PowerPro’s chart, 30 lb braid is as thin as 8 lb mono, so it fits a rod rated 6–12 lb. Can you put 30 lb line on a rod rated 20 lb? The printed range is the mono test the blank was built to load against, so it tells you how hard to pull, not where the line breaks. Thin braid above the range is fine if the drag is set for the rod and the lure stays inside the rod’s lure rating. The rods hub covers power and action, and the reels hub spool capacity and gear ratio.

When do you need a leader, and how do you join it?

A leader is a few feet of a different line between the main line and the lure. It answers braid’s two weaknesses at once: fluorocarbon at the lure is nearly invisible, and it takes the abrasion braid cannot. Three to six feet of fluorocarbon covers most lure fishing on braid, and a longer leader puts the knot in the guides on the cast.

Clear water wants it longer, stained water shorter:

Water	Leader length
Clear-water finesse	6–10 ft (1.8–3 m)
General freshwater	3–6 ft (0.9–1.8 m)
Stained water	2–3 ft (0.6–0.9 m)
Inshore saltwater	2–4 ft (0.6–1.2 m)
Surf	3–6 ft
Offshore trolling	6–15 ft (1.8–4.6 m)

Match the leader close to the braid’s strength or a little below: 20 lb braid pairs with 12–20 lb fluorocarbon. Wire is for teeth. A standard pike leader is 10–14 in, longer for big fish, jerkbaits and glide baits; make it wire.

Join braid to the leader with the FG knot, the slimmest and strongest, or the double uni, the one you can tie in a rocking boat. Wet every fluorocarbon knot and pull it down slowly. Allen, who joins braid to fluorocarbon with a blood knot, calls a wet knot “CRITICAL”, “or the fluoro will be burned.” A fishing leader for toothy fish, surf or fly fishing follows other rules again, and every join from braid to mono is a braid to mono knot with its own trade between strength and bulk.

How do you put line on a reel, and do you need backing?

Braid needs a base, mono and fluorocarbon do not. Braid slips on a bare spool and turns under load like a belt on a pulley. So wind on a layer of mono first: on a size-2500 spinning reel, 20–30 yd (18–27 m) of 8–10 lb. Tie it to the spool with an arbor knot and join the braid with a double uni.

Then put the line on the reel under tension, with the filler spool’s label facing up so the line comes off without twist. Stop about 1/8 in (3 mm) below the lip: an underfilled spool casts short and an overfilled one throws wind knots. A fishing line spooler holds the tension for you.

Backing also saves money, because the bottom of a spool is rarely cast. Wired2Fish’s Shaye Baker uses the same trick with fluorocarbon on a baitcaster. He fills the reel about halfway with mono, joins it with a double uni and finishes with fluorocarbon, which costs far less than a full fluorocarbon fill.

How often should you change fishing line?

Mono goes off with time, braid with wear. Nylon weakens in sunlight and absorbs water, losing up to a fifth of its strength after 100 hours in the sun. Fluorocarbon is not affected by UV, Seaguar says, and polyethylene braid shrugs it off.

How often depends on how hard you fish:

Line	Heavy angler	Moderate	Weekend angler
Monofilament	3–4 times a year	2–3 times a year	Once a year
Fluorocarbon	Up to 3 times a year	1–2 times a year	Once a year
Braid	1–2 times a year	Once a year	Once a year

Hard-fished mono is a once-a-season line, sooner if it lives in the sun, and the weeks before the season are the time to re-spool. Read the line, not only the calendar:

Run the working end through your fingers after every trip. A rough, fuzzy or flattened patch means cut back, about 10 ft (3 m) when the fraying is near the leader.
Pull-test it. Tie the end to something solid, let out about 25 ft (7.6 m) and pull. Line that breaks before its rating has gone bad.
Store it cool and dry. Heat speeds the aging, and a hot garage, truck cab or boat locker is where it happens. Line stored wet takes in moisture and degrades faster.
Retire braid by wear, not age. Braid can last for years under good conditions; when it starts to look fuzzy, swap it out.

What does fishing line cost, and which brands?

Mono is the cheap line, fluorocarbon the dear one, and braid sits between by the yard but lasts longest. Real spools bear out the table’s cost row. At Tackle Warehouse, 300 yd of 12 lb Berkley Trilene XL costs $10.99, under 4 cents a yard. A 150 yd spool of PowerPro costs $18.50, about 12 cents.

The shelf price exaggerates the gap. Braid lasts three to five times as long as mono, so its cost per trip is lower. That is also the case for braid with a leader: the expensive main line stays on the reel, and only the short, cheap end gets replaced.

A few names cover most of the shelf. Berkley (Trilene, Big Game, Vanish) and SpiderWire are both sold by Pure Fishing. Seaguar is the brand of Kureha, the company that invented fluorocarbon line in 1971. PowerPro has been Shimano’s braid since 2009. Wired2Fish’s Jason Sealock names Maxima Ultragreen his best monofilament for 2026. Is SpiderWire good? OutdoorGearLab names SpiderWire Stealth the best fishing line for most people: “extra thin for its strength” and limp, though easier for fish to see in clear water. For named picks, weigh the best braided fishing line by strands and diameter, the best fishing line by job and price per 100 yd, and PowerPro braid by its four constructions.

Two large spools of braided fishing line, one blue-gray and one green

Spools of braided line. Photo: prostophotos / Depositphotos.

What about copolymer, fused, wire and lead-core line?

Those are the lines beyond the big three, each for a narrower job:

Copolymer is nylon blended with a second polymer for less stretch and memory than plain mono. Sealock calls Maxima Ultragreen “some of the most supple and castable copolymer monofilament ever made”. A fluorocarbon-coated line, such as P-Line Floroclear, is a copolymer core with a thin fluorocarbon skin. Seaguar’s verdict on coated nylon: “It’s like comparing apples to oranges.”
Fused line is a superline whose fibers are thermally or chemically fused rather than braided; Berkley FireLine is one.
Wire is mostly leader material against teeth. Copper, Monel and lead-core lines are heavy trolling main lines.
Fly line is a tough braided or monofilament core in a thick waterproof plastic sheath. Its tapered leader and tippet are a system of their own.

What do you do with old fishing line?

Recycle the mono and fluorocarbon, and bin the rest cut short. Florida’s Monofilament Recovery and Recycling Program takes only single-strand nylon line, mono and fluorocarbon; braid and line with wire cannot be recycled. Volunteers clean the collected line of hooks and weights. Berkley, in Spirit Lake, Iowa, melts it into plastic pellets for tackle boxes and spools; it is not made into new line.

Line that cannot be recycled goes in a trash can with a lid, cut into 6–12 in pieces. Longer pieces get pulled out by birds building nests and animals looking for food. One dead sea turtle in the program’s records had swallowed 590 ft of fishing line. To recycle, use an outdoor line bin at a ramp or pier, a cardboard box in a tackle shop, or mail the line to Berkley.

The names, if you want them

Monofilament is nylon, first sold as fishing line by DuPont in 1939. Fluorocarbon is polyvinylidene fluoride (PVDF), first spun into fishing line by Kureha in 1971 and sold as Seaguar. Braid is gel-spun polyethylene, sold under the Spectra and Dyneema names and woven from four, eight or more strands, which the makers call carriers. The hooks hub covers the other end of the line, and the gear hub the five gear decisions.

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