We Rate the 8 Best Fly Fishing Indicators

A fly-fishing strike indicator needs to perform three roles. It must be buoyant, visible, and not spook wary fish. Ideally, it will also be durable and easy to attach to a leader.

Strike indicators serve several key purposes. They aid in the detection of a strike. When a trout or fish grabs the fly the indicator moves or is pulled beneath the surface. A secondary, but equally important use of a strike indicator is to set the depth at which a sinking fly or nymph floats through the water.

Update: In December 2021 I decided to add the Orvis CorQs and the Oros Strike indicator. Both are impressive products that I overlooked the first time around.

I am also planning to test the Ghostech Indicator this spring, it is a rather unique product and my initial impressions have been highly positive.

Indicator Reviews

Factors I use to rate indicators

  1. Bouyancy (How bouyant an indicator is at any given size)
  2. Durability / Longivity (How well an indicator remains bouyant after repeated use and drownings)
  3. Fish Wariness (Spooky fish, need smaller more natural looking indicators)
  4. Castability (Larger, and offcentre indicators are harder to cast)
  5. Adjustability (Indicators position needs to be adjusted to fish varying water depths)

AIR-LOCK Strike Indicator

Tiny foam balls with a clever screw mount

Air-Lock Strike Indicators are made out of low-density foam. They are quick and easy to use and are a breeze to adjust. Simply unscrew the little end nut and lay the leader into the grove. Then lock everything in place by screwing the nut down tight. They come in three sizes (1/2”, 3/4”, and 1” sizes), and three colors (white, pink, and orange)

I find the lightweight foam construction easier casting than the likes of a hard plastic thingamabobber, but they are still more noticeable than a pinch of yarn. The larger sizes can be challenging to roll over in windy conditions. I also found it a bit difficult to smoothly roll cast. The nut jutting out can also tangle the line at times.

It does attach to the line much more securely than the thingmabobber, so a much better choice for fine diameter leaders because it almost never moves.

The grey locking nut assists to camouflage the indicator when floating overhead, but it is still going to spook wary wild brown trout. Stock trout rarely seem to care.

Apparently, they are now entirely biodegradable so losing one will not litter the environment with long lasting plastic, although I do find the plastic nuts are quite easy to drop and lose. If you really care about the environment it is still much better to use a cork or wool indicator.

Overall, Air Lock Strike indicators are very buoyant, reasonable to cast, and ideal for bigger water applications. They work fine, but I feel the newly released Oros indicator does the same role better. (See review towards the bottom of this list)

Ease of use5/5


Hard plastic balls

Thingamabobbers are hard plastic strike indicators. Due to their high level of buoyancy, they are very popular with big water anglers.

They are very visible and buoyant. Perfect for fishing heavy nymphs or large streamers through fast-flowing water. The weight does impact casting and in particular roll casting and can land quite heavily making an audible splash. These are not a strike indicator for precision casting.

As casting goes, they are not the best. They do kink the line slightly which can make them difficult to roll over in windy conditions. I also notice they can slide alone when used with extra fine tippet material.

When conditions are low and clear I personally do not use them in my local rivers, the wary wild brown trout which see too much angling pressure swim a mile the moment such an indicator splashes down. But, in big, slightly cloudy water with less wary fish, they are an excellent option.

Rigging is simple. Simply thread the leader through the hole in the thingamabobber, and accurately position it. Then secure in place by sliding the plastic pin into the hole. Once secure it is unlikely to move unless it is used on a stiff fine diameter leader. To move the thingamabobber simply remove the pin and reposition. It really is quite simple.

For night fishing, there is a glow in the dark thingamabober. During the day it is clear, but at night it glows a pale green. It does require frequent recharging with a headlamp to keep it visible.

The thingamabober comes in five colors and four sizes (1/2″, 3/4″, 1” and 1 1/4″.) The 1/2 inch side is the best for smaller water such as streams. While the 1″ and larger are popular for bigger waters and fishing heavy nymphs. I feel the 1 1/4″ is too big for most fly fishing situations but does make for a good bobber for bait anglers.

Overall, Thingamabobers offer excellent buoyancy, great visibility and are built tough. If you just want to float a heavy fly, in turbulent water they are a great choice. They are a bit tricky to cast especially when it is windy.

Ease of use4/5

Loon Biokstrike

Bright, mouldable putty

There are several putty indicators on the market, and Loon Biostrike is the one I use most often. It is reusable, biodegradable, and environmentally friendly. I believe Orvis also makes a version but it has been a while since I seen it in stock.

I have seen stock trout confuse putty indicators for a pellet. They quite often raise and take the putty by mistake. Now that I think about it, Indicator putty is not that different from the ‘powerbaits’ bait anglers use while fishing.

Bio-puttys stay on the line better when temperatures are colder. In warmer temperatures, it is not uncommon to lose the occasional ball while casting.

With wet fingers, roll the putty into a tight ball then pinch it anywhere on the leader. Applying it around knots makes it less likely to come off while casting. If you want to move or remove the putty simply wet your finger and peel it off. It can be stored back in the container and used again. When fishing to wary fish I try to use the smallest ball of putty I can get away with.

The putty comes in a range of high visibility colors. I have not seen it in recent years, but there used to be a glow in the dark version for night fishing. The putty floats reasonably well and can be a good indicator when fishing small dry flies. For greater floatation, simply increase the amount of putty.

Overall, the biostrike indicators are easy and quick to apply, but they can also be easy to lose. They offer decent buoyancy and visibility. I feel it is a convenient way to quickly add or remove an indicator.

Ease of use5/5

Palsa Pinch on Strike Indicators

These were the first indicators I ever fished, and I still keep a few in my vest. They are easy but permanent. They are also very cheap hence why they were my initial purchase. For an angler on a budget, they are a great option.

These indicators can not be more simple. Just peel them off the backing and stick them around the leader. These strike indicators are made from foam with an adhesive backing. When lake fishing, one indicator is enough to float almost any fly. When fishing faster turbulent water multiple indicators can be applied to increase buoyancy.

In very turbulent water, at times I find them quite hard to see. They float quite low in the water and, at times even become fully submerged.

They cast well, and do not kink the line. They land relatively gently on the water making them suitable for conditions where stealth and precision are required.

They are a one-time use indicator, they can not be repositioned. The adhesive is strong, and they do last many casts before coming off. In cold conditions, they can be a bit tricky to remove, and the adhesive leaves a sticky residue on the line.

I have also read reports of these littering the banks of trout rivers. They are not biodegradable so should be taken home and disposed of properly.

I always keep a few in my fly vest, but I rarely use them.

Pinch on foam indicators are cheap and fast to apply. But they are a one time use. They are decently buoyant and reasonably visible. Good budget option.

Ease of use5/5

Wool / Yarn

Pro tip: Bring a sheep with you to the river for an endless supply of wool

Plain wool makes an excellent indicator and it is my personal preference. It floats well, casts and lands gently without a splash.

A small wool indicator is no more difficult to cast than a dry fly. The reason, I like wool or yarn indicators more than any other is that they create minimal drag, allowing the nymph below the surface to control the drift and not the ‘indicator’ bobbing on the surface. Unnatural drag scare trout, and yarn creates less drag than any other indicator.

I grew up on a sheep farm, so I had a ready supply of natural wool which I still prefer over commercial products. Today, I attach the wool to my leader using a Strike Indicator Loop knot. It is more expensive, but it is much easier to change position.

Wool indicators are a bit more time consuming to tie, but it is worth the effort. It results in a very streamlined cast and natural presentation. All for a few cents per indicator.

Many companies sell washed natural wool and synthetic yarn. It works okay, but can lack the natural oil so applying a few drops of floatant can help keep it afloat. Crafting stores often sell wool in bulk for the same price as a little sachet sold to fly fishermen. Due to the natural oils, I prefer nature wool straight from the fence, but I admit in some countries that can be impossible to find.

Wool indicators are the best option for delicate presentations and minimal drag. A few times I have had trout raise and taken my indicator by mistake. This will never happen with a foam ball.

Ease of use1/5

New Zealand Strike Indicator System

The New Zealand Strike Indicator is a system to apply wool indicators. It makes the wool quicker and easier to attach to your leader. It is also very simple to move along. A great time saver.

It maintains all of the same benefits as wool/yarn but at a much higher price.

Ease of use4/5

Oros strike indicator

(New Product) The Oros Strike is an impressive new strike indicator and I personally feel it is the best foam or plastic indicator currently on the market. The indicator splits in half, with one half acting as the bolt and the other the nut.

The line runs through a slit in the middle of the bolt. This means the line runs straight through the middle of the indicator making the entire setup more streamlined and balanced, nothing jugging out to get tangled.

This results in less turbulence during the cast. I find it easier to cast than the likes of Thingamabobbers or Airlocks which are connected on the side. In this regard, it is certainly an improvement over the incumbents.

They are also very easy to use, simply unscrew the two halves, then thread in the line and tighten. If you want to change the position, simply loosen it slightly and reposition along the line.

As a foam ball indicator, it is well suited for suspending weighted nymphs in turbulent water. It is also very visible, both for the angler and for the fish. I personally, would not recommend them when presenting to wary wild fish.

The foam is made with a biodegradable plastic additive, which supposedly allows it to decompose faster than traditional foam. A step in the right direction, but I still consider it more polluting than wool or cork.

The Oros strike indicator is a game changer. Being more streamlined makes them much easier to cast than the older style round ball indicators. Still not recommended for casting to wary trout.

Ease of use5/5

CorQs Strike Indicators

Orvis CorQ Strike Indicator

The Orvis CorQs indicator somehow escaped my memory when I first wrote my indicator round-up. I find it very hard to find in stores. This was quite the oversight because the CorQs is a great, environmentally friendly strike indicator.

Firstly, a good strike indicator must be buoyant and the CorQs is up there with the best. Orvis claims their cork is more buoyant than the synthetic indicators, but I found both types to float equally well.

The painted top is also highly visible, maybe not quite as visible as some of the foam indicators but I doubt anyone will struggle to see them.

And unlike the plastic indicators, the bottom half of the CorQs is cork. Which has a very natural appearance, from below it looks like a piece of strange wood floating downstream.

I also need to mention the ease of use. To install the Corqs simply push a loop of line through the rubber o ring, and up and over the ball, then draw the line tight. It is not difficult. To take the CorQs off, simply push some slack into the line and reverse the procedure. Certainly easier than tying and untying a knot.

No strike indicator is perfect, and the CorQs does suffer from being somewhat off center. That causes some slight turbulence during the cast. This is an issue it shares with the likes of the Air-lock and the Thingamabobber. Also, on very fine diameter leaders it can slide along the line slightly after multiple casts.

If you want a highly buoyant, environmentally friendly, and very visible strike indicator then the Corqs is certainly a front runner. I also find, being natural wood makes it slightly less threatening to wild trout than the foam or plastic ball indicators.

Ease of use4/5

Additional Information Regarding Indicator

Types of fly fishing indicators

Fly fishing indicators must be visible
White indicators contrast nicely against dark surfaces

Fly fishing indicators come in many sizes, materials, and designs. Indicators are made from both natural and synthetic materials.

All fly fishing indicators need to float on the water surface and be highly visible. Ideally, they will also be lightweight, small, and streamline not to interfere with the cast or to cause additional drag which can spook fish.

Wool and Yarn: Wool is a traditional and time proven natural indicator. Greasy lanolin rich wool taken from the farmer’s fence often floats the best. A great option for anglers in the United Kingdom, Australia, and New Zealand.

Wool is naturally buoyant, thanks to its large surface area to weight ratio and naturally occurring lanolin oils. Eventually, it does become waterlogged, so applying oils and other floatants can help keep it afloat. Larger amounts of wool can be used to keep larger flies afloat.

White wool contrasts nicely against the dark water surface. Dyed wool in bright colors is even easier to see. Don’t use spun wool for an indicator natural fibers work best.

Various synthetic yarns share many of the same characteristics as wool. Some contain very lightweight and fluffy fibers. Synthetic yarn has grown in popularity because of its superior buoyancy and brighter colors.

Foam: Foam indicators have excellent buoyancy. They are typically small, brightly colored balls of foam that are attached to the fly line. Foam is best used in turbulent water with a lot of downward pressure.

Stick on: There are also little Stick-on Oval indicators. Being foam, they offer good buoyancy. They are among the quickest indicators to apply, just remove the back tape and pinch over the line. They are non-damaging to the line. although not as durable as some indicators. The adhesives will eventually fail.

One downside, they are difficult to remove or reposition along the line.

Hard plastic balls. Rigid plastic balls are a common indicator design. The line threads through a tiny hole, then secured with a plastic pin or toothpick. These indicators offer good visibility and excellent floatation.

Downsides include that you must remove the fly before threading through the leader. They are also relativity bulky, causing some disturbance to the presentation. These balls are best used in big water, strong current fishing where visibility and floatation are more important than stealth and precision.

Bio-putty: Is very easy and quick to apply. Simply form a small ball with it, and squeeze around the leader. The putty hardens on contact with cold water. Applying the putty to the knots helps prevent it flying off during casts.

Using a dry fly as an Indicator

We have all seen it. Our fly is gently drifting, and up comes a hungry trout eager to feed. The trout turns, opens its mouth wide and engulfs the indicator. Moments later, the trout spits it out before returning to the depths.

This is the primary reason many anglers’ indicator of choice is a dry fly. In calm conditions, a buoyant and visible dry fly kills two birds with one stone. Its bright wings play the role of an indicator, while at the same time it is a dry fly.

Best dry flies to use as an indicator.

Almost any dry fly can be used as an indicator. It only needs to be buoyant enough to stay afloat.

One of the most popular dry flies to use as an indicator is the Royal Wluff. The royal fluff does a good job at imitating mayflies and tiny terrestrial insects. Bright white hairs on the back make it very visible from afar. The Klinkhammer is a popular alternative.

Simulator, the simulator is a large fly with a lot of buoyancy. It represents large terrestrial insects. It works well during the hot summer months when there is plenty of insect activity. A cicada imitation is a good option during the Cicada hatch in New Zealand.

Foam Bugs. Small foam bug flies float well while resembling insects. One such example is the Unsinkabeetle. In small sizes they represent house flies, while the larger sizes represent bigger terrestrials.

Indicator setup – How to attach an indicator

Several factors determine the ideal location of an indicator. The most common factor is the depth you wish to fish the nymph. Placing an indicator towards the fly line allows the nymph to sink deeper into the water column, in contrast moving an indicator towards a nymph means it would drift just below the surface.

The most common method to attach a yarn or wool indicator to the leader is with an open indicator knot. This knot is very easy to tie but is quite weak. Avoid tying it in the tippet or thin portions of the leader.

Another variation is to tie a half hitch and thread the indicator through the loop then tighten. Then create a second loop over the half hitch securing it in place and preventing it from moving. Trim the yarn to the desired size and start fishing.

To remove the indicator, pull the indicator fibers apart which would open up the knot. All knots weaken the breaking strain of the line, so avoid tying them in lightweight tippet material.

New Zealand Indicator tool

The purpose of the New Zealand indicator tool is to install yarn or wool indicators.

An indicator tool is a finesse tool somewhat resembling a Latch Hook. The tool is easy to use. Start by creating a tiny loop in the line. Before inserting a tiny piece of tubing over the loop. Then thread the indicator fibers through the loop. Close the loop by squeezing the tiny tube against the yarn.

It is a knotless method for installing indicator yarn onto the fly line. The yarn is easy to remove by pulling the tubing away. It is also easy to move the indicator along the line. Quite a versatile little system. The tool makes it easy to use a precise amount of yarn. Allowing for bigger or smaller indicators.

Adjustable fly fishing indicator

Most fly-fishing indicators are adjustable, meaning they are easy to remove or relocate along the line.

The most adjustable indicators once installed are the hard plastic balls. It is possible to change their location by removing the locking pin and sliding the ball to its new location.

Yarn or wool indicators installed using the Indicator tool method are also very adjustable. Just loosen the locking tube, and slowly work the yarn along the line.

Bio-putty indicators need to be removed, then rolled into a new ball and reapplied. Bio-putty does slip so most users apply it around a knot in the line.

The less adjustable indicators are the stick-on pads and dry flies. Stick-on pads must be removed before replacing with a new one. Dry flies need to be retied to their new location.

Fly-fishing without an indicator.

It is possible to fly fish with nymphs and tiny wet flies without an indicator. There are several reasons to do so. The first is simplicity can be beautiful. Fishing with just a fly allows for more casting precision and graceful presentations.

In very clear water when casting to feeding fish. It is possible to see the trout take the nymph. When a trout opens its mouth to feed, you can briefly see the whites of its jaws flash. This is the indication to strike.

When sight fishing, the precision of presentation is of most importance. Fishing with an indicator not only makes precision casting harder, but it might also actually spook the fish.

When not to use use indicators – fishing deep water.

When fishing deep water, you do not want an indicator. One of the primary purposes of an indicator is to keep the fly or nymph close to the surface. When trying to fish deep the indicator simply pulls the fly back to the surface. If you add even more weight, the indicator gets pulled under and creates unwanted drag.

Similarly, when actively fishing streamers indicators simply get in the way. The conventional streamer fishing method is to let it naturally swing across the current. Before giving it a few strips. With the line under tension, you should be able to feel any strike.

How to tell when a fish strikes?

Detecting strikes without an indicator can be difficult. It is a more advanced technique. Luckily, there are subtle ways to tell when a trout has taken your fly.

The most common solution is to closely watch the tip of the fly line. Just like an indicator It would ‘unnaturally’ jerk and move when a fish makes contact. It takes concentration and keen eyesight, but is a proven way to detect takes.

If you are sight fishing and can see the trout. Then watch for movement. It is normally possible to see a trout turn its head and open its mouth when taking a fly. This is the indication to strike.

Finally, is to fish by feel. With minimal slack in the line, you can feel the wiggle and weight of a hooked trout. Fishing by feel requires the line to be under tension. This method is often used when actively fishing with streamers.

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