Simplicity is something that is a trademark of a fish catching fly. Ben Lupton looks at a pattern that fits the brief perfectly.
I stumbled across an interesting pattern a couple of years ago while doing a bit of research on the Sawyer's Killer Bug - a pattern called the Utah Killer bug. At the time it had only been revealed and talked about on the US Tenkara forums, many even called it their one fly pattern. A blog post I wrote last year is my most read post by several thousand views, I can only assume the UKB is a universally popular fly and rightly so - this is a devastatingly deadly fly. As with Sawyer's bug this is also tied with particular materials; the yarn is Jamieson's of Shetland spindrift wool, the colour Oyster. The original dressing uses pink thread for tying and pink wire for weight. For simplicity I have omitted the thread tying as I would a Sawyer's Killer bug using just the wire. Tied on a curved grub hook the profile screams shrimp and when wet this fly glows, it is translucent with a fantastic pink hue, it makes a great subtle replacement for the gaudy pink grayling bugs.
The grayling population in my club river is sparse and localised, as such it is hard to go out for a day and specifically target them. When I do fish for them, the Utah Killer bug catches its fair share and not just on my limestone club river, it has caught me many fish on northern freestone rivers, but don't be fooled, this isn't just a fly for grayling as proved by some superb trout caught this year, including a 17" trout from a coarse section of my club river that was captured on film.
To tie my version of the UKB you need only two materials: 0.20mm pink wire and oyster coloured Jamieson's of Shetland Spindrift wool. I have found the best size for this fly is 12, although I do tie them in 14s. The wool can easily be purchased directly from Jamieson's themselves or through fly tying material stockists that sell smaller amounts, personally a whole ball represents much better value for money and you'll have more than enough to last as well as passing some on to friends.
Use a drop of superglue to secure the wire under-body and start wrapping the wire at around the two-thirds point back from the eye.
Wind the wire in touching turns to the eye. Take one long wrap back so the wire is at the one-third point on the hook shank and recommence the touching turns back around the bend. Once you have wrapped a second layer of wire covering the middle section of the shank, make another long wrap to the starting point of the wire and trap down the tag end. Helicopter the tag end off and make another couple of turns of wire and leave; the wire will not unravel. The under-body should appear to taper up from the eye to a thicker middle and taper back down at the end of the body.
Tie in a length of wool starting where the second layer of wire ends - keep hold of the tag end - wrap the wool to the eye, then wind the wool back towards the bend so there are two layers of wool. When you reach the tag end of wool, trap it with one or two wraps of wool and cut off the excess. Continue to where the wire has been left and tie off the wool with four or five turns of wire working back towards the eye. Trim the remaining length of wool and cut the wire close; a drop of superglue on the wire will keep it from coming undone.
A quick simple tie and very effective. For more weight wrap a layer or two of adhesive lead and wind a single layer of wire starting at the eye.
Of course the proof is in the pudding. I wrote earlier about a 17" trout caught on film on the Utah Killer Bug, this fish had refused several flies including some that I consider to be very effective and one that rarely gets declined, the JP Pupa. Tying on the UKB more as a last gasp - not so much a last resort - but I was beginning to despair, thinking it would be long before the trout spooked and taking my chance and the other fish with it. Second cast and the trout tilted up and then shook it head as it tried to eject the fly, the video tells the whole story, from then on this season I started to fish the UKB much more, recently using it as a single fly on the end of a French leader during low summer flows, because it is tied with just copper wire it isn't too heavy to fish during drought conditions.
My biggest fish to date caught on a UKB is a grown-on stocked trout that measured 18 1/2" and weighed 2lb 13 1/2oz, this fish is a few miles down stream of where it was likely stocked and certainly wouldn't have been more than 12" when first stocked. The grayling fishing has been improving since the season started and of late they have far outnumbered trout, sometimes by a big margin. A recent afternoon trip with my friend Tom, saw us catch over thirty fish with grayling making nearly three quarters of the total catch - we both fished a single size 12 UKB on the end of a French leader, my preferred method at the moment.
I implore you to give this fly a go, of course you can experiment with different colour combinations - in fact I have just ordered a few new balls of yarn - the profile of this fly suggests that of a shrimp so think of the colours you tie your shrimp/scud patterns in - I'll be tying up some orange, bright pink, watery olive/grey as well as dark grey versions - you can't get any simpler.
For more fishing and fly tying be sure to visit Ben's blog "In Pursuit of Spotties".