Originally Posted by Ray
Ray,
the fly I have tied is a single hackle in the style of Griffiths whereas the Bivisible incorporates an additional couple of turns of white hackle at the head to aid in it's visibility to the angler. Looking at the link you provided, the Bivisible is also 'tailed' where the Griffiths Gnat is tail less. A variant across here uses a couple of fine strands of pearl mylar to imitate a shuck and can increase the taking capabilities of this fly no end at all.
Representative of a Midge cluster in it's fully dressed form with Peacock Herl under the hackle, Griffiths created a fly that no dry fly fisher should be without in his or her box.
Taking this fly down to sizes 20 to 24 can fool a lot of smutting fish that would ignore any representative patterns at other times.
Clever man was your Mr Griffiths!
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