Do Fish See Fishing Line? Decoding Research and Manufacturer Claims

Walking down the aisles of a tackle store, you will most likely encounter several different choices of fishing line. The line can be fluorocarbon, monofilament, or some type of braided material in multiple colors. One of the biggest questions anglers have is whether fish can see line. As a serious angler, I have used them all and have developed a good understanding of when and where to use each of them based on personal experience, manufacturer claims, and available research.

My take: When we go to a fishing shop we already have a favorite brand that we used usually but sometimes due to some recommendation we might want to try other brands too. Whether you are looking for a main line, fluorocarbon or monofilament there are various brands available that can make us confused in making a choice. There will be tons of questions playing in your mind but normally things like “is the line strong enough”, “is the line robust” or for some experienced anglers “is the fish able to see the line” will be the most important ones.

As a brand owner myself and serious in products creation I have tried almost every fishing lines that are available in the market. And this diversity of experiences has taught me to understand about the line in depth. I came to a situation where every target fish I do my best to suit it will for maximum results.

As mentioned, there are three major types of fishing line. Each has its benefits and should be included in your arsenal. When it comes to being seen underwater, here is what I have found out about each one.

Fluorocarbon Lines

Fluorocarbon line is touted by line companies as the most invisible line on the market. It is said to have the same light refraction properties as water, making it virtually invisible or as invisible as fishing line can get. Fluorocarbon line offers many advantages to anglers, with the invisibility being among the best properties of this type of line. It is well suited for all water clarities. This near-invisible quality of the line is the way to go in ultra-clear water and, theoretically, will lead to increased bites from spooky fish that are used to seeing line connected to lures.

Pink Fluorocarbon

Manufacturers who make pink fluorocarbon lines claim that this tint of line is hard to detect underwater. While it may be hard to believe since they are very visible to anglers, there is some truth to their claims, especially with pink lines. Scientific studies and first hand accounts of divers underwater have shown that pink loses its color at various depths. It works to blend in with the water and becomes clear to fish. While it may seem unusual to tint a line type like fluorocarbon that is said to be virtually invisible, by all accounts, pink line loses its color and is hard for anglers and fish alike to see underwater.


Monofilament Lines

Monofilament is the most popular line choice on the market and it comes in several different color options. Nearly all of them are marketed as either being hard for fish to detect underwater or easier for anglers to see above water. Here is a breakdown of the most popular colors of monofilament lines and the benefits of each.

Yellow Monofilament Lines

The high-visible yellow color is great for anglers who watch their line to detect bites. The bright color makes it easy to see from above and slight bites are easily noticed. The downside is that it’s more visible to fish below. This color of line is a good choice for dirty water, but in clear water the line is fairly easy to see underwater. It’s a trade off for anglers looking to see their line, and adding to the equation is that aggressive fish may not notice the line as they are about to strike a lure. Yellow line does have a time and place and the benefit of being able to detect bites may outweigh any possible reduction in bites from line-wary fish.

Red Monofilament Lines

Red lines are also said to become invisible underwater. This comes from the studies that show how red objects lose their color first underwater. On the other hand, divers say that red objects that lose their color become black. Those who use red lines also like the fact that they are easy to spot above water.

Adding to the confusion surrounding red line is that companies who produce red hooks say that they generate more bites since they look like blood. Many anglers find it hard to believe that red line is invisible, but red hooks are somehow more visible. Either way, red line is an option for anglers looking for another choice of line color.

Green Monofilament Lines

Green is a good color for blending into the water. The majority of water we anglers fish have some sort of green tint to it. Like camouflage, green line blends into its surroundings and makes a good choice for anglers looking to keep their line invisible to fish. On the other hand, green may be more visible than clear in very clear water. Overall, green is a good line color choice for many different situations.

My Take: Green monofilament line is my second options because its more relate to nature. It can go with almost all kind of water (clear, muddy) and weather. We are surrounded by green trees, weeds in most of our fishing area.

Clear Monofilament Lines

Clear monofilament is a good choice if you are concerned about fish being able to see your line underwater. While the properties of fluorocarbon may make it less visible underneath the surface, clear monofilament works well in all situations.

My Take: This is the easiest option to go with since it’s widely available in the market. You just need to spend time and do some research on-the-field in choosing the best suit to your fishing style. Some are good in strength with high invisibility but some are claims to be.

There is another clear option on the market, and it is typically called clear blue. The line is relatively clear underwater, but the blue tint makes it easier to see above water.


Braided Lines

While there are many benefits to using braided line, being undetected by fish is not one of them. Braided line offers excellent strength for a thin diameter, casts extremely far, and also does not stretch. These properties make braid an excellent choice for fishing around heavy cover and in dirty or muddy water conditions.

To get the most out of your braid in clear water, use a leader of fluorocarbon joined by a Double-Uni or Alberto knot. This allows anglers to have the best properties of both types of line, strength and invisibility.

My Take: I would add Improved Albright knot and FG knot as part of this because they are among the strongest knots and commonly used by anglers. It’s proven and tested knots.


There is much confusion surrounding different colors and types of line as they relate to being able to be seen underwater. While nothing is certain, there are some key truths for anglers looking for the best line for each fishing situation. Fluorocarbon is the line that is most invisible underwater, while braided line is the strongest, yet most visible above water. The same can be said about highly visible colors such as yellow and red. They are easy to see above water and help you detect bites from fish, but they are more likely to be seen underwater by wary fish.

My Take: I would say choose the line based on your fishing spots and also your target fish. Not all fish are sensitive so you can use almost any fishing line as long as you able to understand the basic. One of the suggestions that I can give is use proper length leader when you are using braided line as your main line because it will give better results.

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All information given is based on a best efforts to express our opinions and knowledge that has been acquired. Paragraph or inappropriate words may have been used and it is out of control because we have tried most wisely. If you have suggestions, please comment. We will make changes.

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