Category: Learn

The Boil/Bulge

Bulge

Description: This riseform is most common when fish are taking emerging insects that are stuck just below or in the surface film. This is most often incorrectly diagnosed by most fly fishers, from novice to expert as fish taking dry flies from the surface. As the insect is trapped below the meniscus the fish must rise up and pluck it from beneath the surface. In doing so the fish’s back and/or tail often breaks the surface creating the illusion of a proper rise.

What to do: Watch the disturbance carefully. Sometimes a fish taking emergers will not break the surface but instead leave a slight swirl on the surface as it takes the insect a few inches below the top. If the fish’s nose does not breach the surface then it is emergers that are most likely on the menu. If the the tail/back breaks the surface stick to patterns like the klinkhammer, shaving brush, emerging pupa or parachute floating nymph. If there is just a swirl fish a small imitative nymph with a greased leader to within six inches of the fly pattern.

The Classic Rise

Sip

Description: The trout is feeding on insects on the water’s surface. This is often the case when mayfly duns have hatched and are drifting on top of the water but also when items fall in off the river bank. Beetles, ants, grasshoppers, termites and many other kinds of bugs are taken in this way. Pretty much anything that is floating on the surface.

This rise is the one we see most often and there are variations within the broad heading of the classic rise. Sometimes the tiniest of dimple rises along with a tiny audible sip will be noticed. Often this is to very small items sitting flush in the film. Insects like spent mayfly spinners, midge and ants are often the cause of such rising activity. Sometimes you will not even notice the nose poke through the surface but the noise and a tiny bubble left behind are the confirmation that something was taken from the surface rather than below it. If in doubt as to whether the rise is sub surface or not always look for a bubble in the wake of the rise. As a fish takes something from the top the air is expelled out of the fish’s gills leaving this tell tale sign.

Another aspect of the classic rise is when the fish’s head or nose can be clearly seen breaking the surface. This usually indicates a larger insect sitting higher on the water. Think of a Mayfly dun drifting with its large wing like the mainsail on a sailboat. The trout must lift a fair proportion of its head out of the water to engulf such bug, often giving away its size and position quite well. This is the one most commonly seen riseform when out on the water.

What to do: Again watch carefully. Try and work out what the fish is taking before making a cast. The good news is that as the bugs are floating it is quite easy to work it out (most of the time!). Look closely at the area where the fish is rising. Can you see the wing of a mayfly drifting down or is there a bright green beetle on the water in large numbers. Try and see what the fish is taking. If you cannot see from where you are then get in the line of drift well below the fish and scan the drift line at your feet. Look for the insect that is making up the greatest proportion of food in the drift. If there are large numbers of beetles, a few midge and the odd dun then it is the beetle that should be used first. Alternatively if there are two species of duns on the surface, say a few large kossies but hundreds of small rustys, tie on a small rusty to match the insect most prolific. Match the hatch by choosing a fly that most closely resembles the natural in size, shape and colour.

The Slash or Leap

Slash
Description: This is the most obvious of all takes and occurs when fish either leave the water to chase an airborne insect or slash violently as one pases overhead. As such it is very exciting although often frustrating. Fish will come half way out of the water or even leap clear of the surface in pursuit of an escaping or egg laying insect. This is especially noticeable when caddis are escaping from the water or hovering above the water, when mayfly spinners are mating and egg laying and when adult dragonflies are out and about. The fish see the insect either hovering a few inches above the water or hitting the water and must go all out to capture it. This method wastes a lot of energy and so the larger fish will often not come to the top at these times (on our local waters at least). This sort of behavior from a trout can be breathtaking to watch as a leaping fish can come up to two feet out of the water.

What to do: Work out what insects are in the air. Often this is very easy as the take is so visible and a cloud of caddis, egg laying spinners or a dragonfly on the wing is very easy to see. Sometimes however the focus of the trout may be on tiny spinners and when this occurs it may take a little bit more effort to see them as these insects are #20 and smaller and unless you are looking from the perfect angle can be close to invisible. If spinners are being taken use a traditionally hackled pattern (not parachute) in the correct size and colour. The hackle will keep the body of the fly off the water like the naturals. An elk hair caddis pattern is often best fished with a bit of a twitch as it approaches the location of the fish to imitate the insect dipping onto the water. Dragonflies are best fished by casting a large imitation in the rings of the rise as the fish will often jump and knock them onto the surface and then double back to take it.

 

THE PATTERN THAT WORKS BEST AS OF JAN 11, 2012

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With the willow grubs just around the corner, now is the time to get up to speed with fishing them. The first sightings of willow grubs have been made and we are about a month away from the start of the mayhem once again. Read on to get an idea of what it is all about.

Willow Sawfly

The willow sawfly or willow grub, has quickly attained legendary status among the fly fishers.

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Willow grubs are voracious and love willow leaves of south east Australia. In the few short years since they first appeared around 2005, they have proliferated to the point where it is hard to find trout feeding on anything other than Nematus oligospilus. As such they are an extremely important part of the trout fishing season and one that require further examination.

History

Willow Sawflies arrived in Australia sometime in the middle of this decade. While native to temperate climates of the northern hemisphere, they have thrived in similar environments below the equator, particularly in Chile, Australia and New Zealand.

According to the CSIRO, these insects first appeared around Canberra in 2005. According to our log books we listed them here without knowing what they were in that same year. Over the past 12 months reports from all over north east Victoria place them in huge numbers right across the region. It appears only a matter of time before all of south east Australia is recognised as having populations of this voracious insect.

Officially CSIRO, DPI and the like are saying that the introduction of Willow Sawfly was an accident and not part of a deliberate plan to eradicate willow trees, a species considered a pest by many within the environmental movement. There are some who doubt this claiming that they were deliberately released into Australia to combat willow infestation. This theory has little credibility as the introduction of one pest to remove another is unlikely given our history of failed attempts in the past.

The Grubs

Willow grubs are not large with the larva typically reaching about 20mm length. Adults are only about 6-8mm long. While both stages of the life cycle are important to the fly fisher, it is the larva that is fished most often. Hence when we say grubs in this piece we will be referring to the larva of the Willow Sawfly.

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The grubs vary in both size and colour. Larva found on a single tree may be straw coloured to lime green as well as every shade in between. As fly fishers we typically find that lime green versions are the most successful when imitating this insect in the larval stage. The grubs infest willow trees and totally denude them of leaves, sometimes in a matter of weeks. While bare branches are the hallmark of sawfly infestation, damaged leaves will often be the most noticeable feature pointing to the presence of these grubs.

Timing

Despite recent publications in the fly fishing media on the topic, willow grubs are a very important part of our fishing from November onwards. The oft quoted time of Christmas onwards is so far off the mark as to be ridiculous. Most of our trees have been stripped bare by this point in time.

We have had great fishing with willow grub hatches from the start of November the past two seasons. Localised to begin with, they soon spread far and wide, eating their way down the river. The fish switch to them almost the moment they start falling in and don’t stop until they are gone! That’s the longest rise in Australian fly fishing with at least three to four months fishing as a result.

How the fish respond

The willow grub hatch is not actually a hatch but a fall. A massive fall of grubs that goes on all day, every day from the moment they appear. We are talking a nonstop lemming (yes I know lemmings don’t fit their stereotype but the stereotype fits this description) type drop from the streamside foliage into the rivers.

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The huge number of insects falling onto the water and drifting in the bubble lines, causes a frantic rise by the fish. The trout really key into the ‘blip’ that each grub makes when it hits the water and will actually come 4-5 metres across the drift to take one. Most of the time however the fish will sit in strong bubble lines and simply rise as if on timer every few seconds until the heat from the day fades and the grub’s activity wanes.

This leads us to the real dilemma of fishing this hatch. What do we know about selective feeding from Schwiebert and the like? Well we know that the more prolific and insect, no matter how small in size, the more locked into that food source the fish will become. Selective feeding leads to fish locking onto the key aspects of the food item. Size, shape and colour with presentation the final ingredient required for success.

Matching the Hatch

Are there any commercial patterns available that fit the bill? Not as yet but we will have them ready for this season’s fishing (October 2009). Over the past few years we have played with every type of material in various shades of green and have finally settled on a couple of designs. The search for the right material took a long time but once we found it the catch rate went through the roof.

You can see in the photos how the willow grubs look when on the water and sinking. Upon contact with the cold water the grubs curl up in a C shape. That is the shape we need to mimic; to get the fly to sit horizontally on the surface in a C shape. This requires some careful shaping of the foam with scissors before attaching it to the hook.James’ variation on the willow grub. Simple and effective.

The size of these insects is approximately 6-8mm and I tie them on a fine gauge dry fly hook of about #16. Ok the hook is too big for the insect from the traditional flytier’s perspective, but it’s the shape/size of the body that is important i.e. that the fish locks onto. Not to mention the fact a smaller hook with foam used in this way will result in missed takes.

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Fishing the Grub

The good news about willow grub fishing is that the fish are completely transfixed by them. Such are their numbers that the fish lose all track of their own needs for preservation. Obviously not totally, but enough that you can get right up close to get the perfect presentation to them.

A willow grub riser will be rising frantically and in most cases, assuming that you have the correct fly, its more about timing your presentation to arrive at the precise time that the fish is set to rise. This may sound farfetched but once you fish this hatch you will appreciate it. The fish will get in a rhythm depending on the speed of the water and the number of bugs (which is always heaps!). Sometimes the rises will be 2 seconds apart for fish sitting high to the surface (literally within 3-4 inches) and sometimes it may be every 10 seconds. The trick is to spend a few minutes getting the feel for this rhythm in order to present at the correct time.

This can lead to ridiculously frustrating fishing with fish rising literally a second either side of your presentation. The good news is that they are so focussed on the food that you will be afforded the luxury of dozens of presentations.The grubs sit on the surface anywhere between straught and in a curve. The curve on the right is the most common version

Accuracy is very important as it always is. Drifts are standard affairs with a dead drift, free of drag the only way to go. Try and put yourself in a position where your leader/line will all land in the same amount of current i.e. minimising the potential for drag. When in backwaters and slower side waters, creeping up and hiding before making short bow and arrow casts will work very well.

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The Sinking Grub

As with most terrestrial insects that fall into the water, those not quickly eaten or able to find their way to safety, sink to the bottom of the stream. Fish will lock onto these sinking grubs, taking them exclusively. It is worth tying up some sinking versions or even keeping the more sparsely tied foam ones that fail to float for this very reason.

Conclusion

Our willow grub or sawfly is here to stay. We have had four of the best dry fly seasons ever as a result of their sudden arrival and this year is shaping up to be another great one with another warm season ahead.

As we have figured out the pattern, you simply need to either purchase some or get the materials and instructions from the bottom of this page and tie your own. Then watch our website and head up when we start reporting on them to put into practice the instructions given here on this page. You will be amazed at the results.

Cheers
Antony

Information on the Willow Sawfly from DPI
Information on the Willow Sawfly from CSIRO
Information on the Willow Sawfly from Goulburn Broken Catchment Management Authority

Willow Grub – Antony’s version    How to tie the australian willow grub (sawfly) fly pattern  

Hook: Light gauge Curved grub hook

Thread:  Green 8/0 Uni-Thread

Body: Green Foam – available Spotlight

1/ When tying this fly, hook selection is all important. We have come to the conclusion that a curved hook works best, the finer the gauge the better. All hook manufacturers make a version to suit. Once you have your hook, secure it in the vice and wrap a base of thread, stopping somewhere in line with the hook barb.

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2/ Take some foam and cut it to shape. Its almost boomerang shaped, the idea to represent the C shape that the grubs immediately take once they fall onto the surface of the water. The best way to do this is to cut several pieces at once. I have included some examples down below as seen against a 5c piece. Personally I like a greater curve as per the photo on the right.

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3/ Start tying the foam onto the hook by tying at approximately the 1/3 point of the pre-cut foam body. As you can see, I lash it to the side of the hook rather than the top, as this is the way we want it to float. Make half a dozen tight wraps in the same plane, being careful not to cut/damage the foam.

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4/ This is really the same step but a different view. As seen from above, the body now has a section that kicks out at an angle from the hook. This is first part of creating the illusion of a C shaped grub on the surface. Note again that we have not tied the foam on top of the hook but rather to the side.

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5/ Now skip wrap the thread to a point approximately 1/3-1/4 of the hook shank length back from the hook eye. This is where the next stage will be added and the fly pretty much completed.

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6/ Do exactly as you did in step 4 and tie the foam onto the side of the hook, so that the body sticks out at an angle to the side. Half a dozen wraps should be ample to secure it, remembering to not damage the foam in the process.

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7/ Once again this is another view of the same step. As seen from above, tying the body to the hook at the 1/3 and 2/3 points has created the impression that we have a curled up grub floating on the surface. Of course it isn’t a perfect C, but it is as good as we can get using the materials that we are forced to use, and also when considering that an exact imitation will spin and cause presentation problems.

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8/ Now to finish you can simply use a couple of half hitches or whip finish but I like to do one more thing. Wrap the thread over the top of the body using a small amount of pressure to create a sort of segmented appearance. Take 2 wraps to go to the rear tie in point and a further two to make your way back to the forward tie in point. Then simply finish the fly. This step is often skipped as these extra thread wraps and come apart and a being removed from the sharp teeth of a trout.

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9/ The finished fly as seen from above. This is how it looks floating on the water. It is deliberately tied about 30% oversize as most fish will still take it at this size and it floats well. A small pair of scissors should be carried in case of a refusal. A small trim usually sees any picky fish come to the party.

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For the past few seasons we have been playing with patterns to correctly imitate our local fall of willow grubs. This ubiquitous terrestrial has quickly become a staple food item of our trout from November to March of each season. During the process of developing this fly, there were many dead ends. We played with numerous materials and construction techniques trying countless combinations over a two year period, before finally cracking the code.

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The answer lay in the foam that we were using and also the way in which it was cut and applied to the hook. Many earlier versions used this exact foam, but due to the method used in tying the fly, they mostly spun and caused damage to tippets. They also started twisting when on the water as the spinning tippet tried to straighten. How to tie the australian willow grub (sawfly) fly pattern

After much gnashing of teeth and stuffing about, the answer was found. The foam had to be cut to suit the curled shape of the grub and then simply attached to the hook. This allowed for a curved shape yet at least a third of the body in the centre section, being lashed to the hook. This solved the spinning problem. Then after a little bit of trial and error, we settled on a specific colour in the foam that worked more often than not.

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This foam is not specifically aimed at the fly fishing market. As a result it comes in large quantities/colours for relatively little cost. Spotlight stores carry it and it costs about $20 for 40 Sheets. It measures 6”x9” and has an adhesive back making it also fabulous for hopper bodies and Chernobyl ants. It is made by Darice and called FOAMIES. www.darice.com
Geoff has his own version of the fly, tied completely differently, as does James. These will feature at a later date.

Go fishing…..
Antony