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> > Penns Creek Slate Draker's

This topic is about the Mayfly Genus Isonychia

Sporadic hatches are rarely as outstanding as those of Isonychia. On streams with good populations, they are reliably hatching in light numbers, here and there, for most of the evening through most of the mid- to late season.

The spinners, and occasionally the duns, produce more concentrated action, but the real value of the Isonychia hatch is its duration and the size of the flies; large trout become ever watchful for them, even when they aren't emerging.

All the species of Isonychia are similar in appearance and behavior. Read more...

There are 17 more specimens...

The Discussion

Jsell925July 17th, 2007, 6:07 pm
williamsport pa

Posts: 1
Penns is one of the few places where a #10 iso will nail em' all year long
GONZOJuly 18th, 2007, 8:43 am
Site Editor
"Bear Swamp," PA

Posts: 1681

Welcome to the site! Many find that the Delaware is also a great place to use the slate drake as a searching fly. The rainbows of the Big D seem to be especially fond of a big Iso imitation fished anytime from late spring into the fall. Personally, I'm a big fan of imitating the nymphs.
JimphotoSeptember 20th, 2007, 5:08 pm
Northumberland, PA

Posts: 1
I've found an emerger pattern to be successful on Penns. Apparently not all the nymphs crawl out on stones or the bank to hatch.
KonchuSeptember 22nd, 2007, 4:24 pm
Site Editor

Posts: 505
Curious. Could it be that some get splashed back into the stream? Just a thought for discussion.
Shawnny3September 23rd, 2007, 6:25 am
Pleasant Gap, PA

Posts: 1197
...or could it be that the technical details of our flies don't matter all that much to the fish?

(I say this as much to draw Gonzo out of hiding as to make any serious point.)

Jewelry-Quality Artistic Salmon Flies, by Shawn Davis

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