Deleatidium Pre-emerger  |Originator : Marc Griffiths | Size: 18

Trout often lock onto pre-emergers during moderate to good mayfly hatches, completely ignoring the duns. Trout feeding on pre-emergers exhibit a bulging rise form with the tail and dorsal fin breaking the surface. This pattern is designed to imitate pre-emergent Deleatidium nymphs and can be fished in the surface film, if you grease the fly, and just below the surface if you don't.  This pattern is deadly during mayfly hatches, on the Mataura River for example.

Fishing Tip:  To fish the Dileatidium Pre-emerger in the surface film, or thereabouts, attach it to the bend of a visible dry fly, which serves as a sighter. Use it in tandem with a heavier nymph for fish selectively feeding on small nymphs in deeper water.