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Today’s better leader materials are so crucial that we need to read the labels and not be so quick to buy the cheap stuff. Stick with your local fly shop

[dropcap]T[/dropcap]oday, compared to my first introduction to monofilament leader material (the 1950’s) there have been technology additions to it that have improved the performance – reduced diameter thickness for break strengths, lower stretch numbers, less UV degradation, and knots that have been introduced to defeat slippage.

More news of the same nature is true of fluorocarbon leader material. It too has improved, but the wonder material started with some flaws which again leads to the warning of buyer beware – cheap isn’t the road that should be most traveled.


Mono does not need a long introduction if you’ve been fishing for a while (spin, bait, lure, fly fish) because almost everyone teethed on it and it’s still the most popular leader material – think value $.

Its virtues are better seating, holds better in a knot, and makes many popular knots better than if tied with fluorocarbon.

Mono is an excellent non-spooking line because of its translucency.

Short suits of mono are that it has a shape or memory problem and it stretches. The latter creates a delay on a hookset that translates not getting the initial pound test pressure you believe you are. Tournament anglers, from whom we can always learn mo-betta, want a line that can transfer the energy of a hookset equivalent to putting the pedal to the metal – floor it.


Controversially, of course, I do not use fluorocarbon leaders on most of the families Salmonidae: Salmo, Atlantic species; Oncorhynchus, Pacific species; and Salvelinus, which includes fish also sometimes called char. The oceanic trout of the family Salmonidae can be an exception, like a 40-pound hen Atlantic salmon, but not necessarily exempt.

Admittedly, my thinking is old-timer on the matter of fluorocarbon leaders because its introduction was initially limited to saltwater applications – and I’m stuck there. Oddly, that intro was only about a dozen or so years ago – time flies.

Here are fluorocarbon leaders’ current “combine” plaudits:

Initially advertised as no stretch, and some people still believe the “misstatement” was… as compared to monofilament. Off-putting at best because it does stretch in combat, but not at such low-pound pull pressure as monofilament.

So, it does have more sensitivity to feel a nibble because it of having a higher density – sinks faster (less bow in the line) because it’s noticeably heavier by size and thinner in equivalent pound test, as well as stretch response. It also has better invisibility than mono – nearly the same refractive index as water which is very effective in gin clear water, and improved durability versus UV.

These differing effects in the water impact how it performs. Tournament anglers almost unanimously prefer those features compared to monofilament’

The biggest saltwater bravado for fluorocarbon is abrasion resistance. Fluorocarbon is just better than mono, and on the flats that’s a big deal as well as in thick cover, nymphing or jigging off the bottom.

Fluorocarbon is waterproof – same strength wet or dry over many, many cycles of being fished which is not true of monofilament.

Diameters of mono and fluoro are vastly different – flouro is thinner versus the same pound test. For example, a 20-pound tippet in mono is – 20 lb 0.013” / .33 mm 20 lb / 9,1 KG. Fluorocarbon 20 lb 0.015” / .38 MM 20 lb / 10,0 KG… or around 15% thinner than mono. — Scientific Anglers

Braided is opaque

There does not seem to be a rush to the checkout counter by fly fishers when it comes to braided. It’s a favorite of bass tournament participants, spin fishers, and bait chuckers.


It’s made of the same stuff as the braid, but it’s never braided. “To make Nanofil, we take the basic fibers, and we fuse them, more or less. We molecularly connect them, and we shape it. It feels like a monofilament. It’s never braided. The fibers stay more oriented linearly.” — Clay Norris, senior brand manager for Berkley

More comments on Nanofil

It also allows for lower line diameters. Nanofil is ultra-thin. The 6-pound-test has a sewing-thread diameter of .005 inches, and the 12-pound-test is only slightly thicker at .008 inches.

The negative with such a thin line is that it takes a whole bunch of the stuff to fill a reel. Also, the friction of the line rubbing against itself causes it to fail if it is tied while dry. There’s not enough thickness to the line to absorb the nicks and scratching that occurs when a dry knot is cinched.

But that thinness allows an angler to cast a lure tied to Nanofil about 472 miles. The stuff sails off a spinning reel, giving it a great application for spooky redfish in clear, shallow water.” — Todd Masson, The Times-Picayune – NOLA


Author Skip

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