Developed by Seaguar, the world’s foremost fluorocarbon line manufacturer, the Seaguar Knot was built around the need to attach tough leaders to your monofilament main line. Right away, that should hint at the limitations of its use: the Seaguar knot is a one-trick pony - and frankly not one you’ll likely grow to love.
There are many other knots that do the same job, tie just as easily, hold as well or better, and have a slimmer profile for passing through your guides. That’s not to say that the Seaguar Knot doesn’t work--it does--but rather that it’s rarely anyone’s first choice.
An exception is fly angling, where the Seaguar has proven itself to be an awesome choice for connecting leader to tippet.
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In fly fishing, where the size of the knot connecting your leader to your tippet won’t matter (within reason), the Seaguar Knot is an excellent choice. It holds really well and ties easily.
Frankly, a lot.
Outside of fly angling, the Seaguar Knot has some stiff competition: the Surgeon’s Knot, the Blood Knot, and the Double Uni being the big three. Each of these knots is strong and battle-proven, and both the Surgeon’s and Blood knots are definitely slimmer when tied than the Seaguar.
A slender knot will pass through your guides more easily, allowing for better casting. In the salt, that may not matter too much, as the guides on saltwater rods tend to be larger than they are on a bass rod, for instance. But for largemouth, you want a slender knot, and the Seaguar isn’t the best choice for joining a fluorocarbon leader to your mono.
It’s also a very specific knot, designed around the needs of a fluoro to mono connection. Intolerant of radically different diameters, it’s a poor choice for joining lines that are dissimilar in size. It’s also completely ineffective in braid, as it doesn’t provide enough pressure to stop slippage.
You might be tempted to use this easy-to-tie knot to connect your braided main line to your fluoro leader, but don’t make that mistake.
Not only is the Seaguar Knot not designed for dissimilar diameters, allowing the smaller line to slip through, it simply doesn’t provide enough pressure to bind the slick Spectra and Dyneema fibers that braid is woven from.
Braid has what engineers and scientists call a “low coefficient of friction,” meaning that it doesn’t like to bite against itself. To overcome that problem, a good braid knot needs plenty of turns and loops, magnifying the pressure points on the line to allow it to bite and grip.
The Seaguar Knot was designed around the high coefficient of friction common to both nylon monofilament and fluorocarbon. It simply will not hold in braid, no matter how well the knot is executed.
The Seaguar Knot is a reliable way to join monofilament main line to a fluorocarbon leader, but it can fail.
Some of the most common reasons for this include: