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Bivisible Dun, Baetis Tying Instructions |
Materials:
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Actual Baetis 
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Variations: |
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Bivisible Dun, PMD 
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Materials: (to Order Material, click the link)
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Bivisible Dun, Callibaetis 
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Materials: (to Order Material, click the link)
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Bivisible Dun, Green Drake 
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Materials: (to Order Material, click the link)
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The Bivisible Dun is a mayfly emerger pattern that was designed by Sierra fly fishing guide Ralph Cutter of Nevada City, CA. Ralph and Lisa Cutter owned California School of Fly Fishing which taught fly fishing for over 36 years. Ralph and Lisa closed the school in 2017 to retire. They are still active with Cal Trout, Trout Unlimited, Fly Fishers International, and United Anglers. The Bivisible Dun has no resemblance to the more reknown Bivisible. The Bivisible is an attractor dry that is tied with two palmered hackle, the front hackle usually being a lighter color, often white. The Bivisible Dun is a Parachute Dun pattern with a two colored post and a trailing shuck similar to a sparkle dun. The only reason Ralph used the name Bivisible Dun is due to the two color post of white and black calf tail. Having this two-tone wing post can be a great advantage when the fly moves into and out of shadows. One or the other colors will stand out. The two-tone wingpost is also an advantage during a massive hatch where it distinguishes itself to the flyfisher from amongst the actual duns. Ralph incorporated the characters of certain patterns and brought them together for this one. It tends to have the sillouette of a Sparkle Dun with it's Z-lon tail and tapered dubbed body. The post and parachute characteristics come from a Parachute Dun. Calf Tail can be tricky since the kinky nature of the material makes it impossible to even the tips. AK Best focused on Turkey Flats for this reason. The color contrast of the black and white calf tail is distinct and a valuable aspect of this pattern. Try to keep the bulk of the material to a minimum by preening out the smaller underfur.
When fishing this pattern look for signs of rises on the water surface where the trout are taking the emergers. The trout will often select an "observation post" that will be upstream of the the actual rise impression and it will be necessary to cast upstream from the rise so that the trout can actually observe the pattern prior to the take. Vince Marinaro illustrates this action within his book, Ring of the Rise, in 1995. Placing the fly within the cone of sight of the trout is a function of depth of the observation post. If the trout is 3 feet below the surface, it can only see a cone of 2'8" at the surface. If the trout is 12 inches below the surface it can only see a cone of 11" at the surface. This illustrates the importance of presenting the fly within a narrow range that the trout can actually observe and react too.