Matt Grobert, blogger and author of [easyazon-link asin=”1571884173″ locale=”us”]Fly Fishing New Jersey Trout Streams[/easyazon-link]┬ádemonstrates how to tie a Slate Drake (aka, Isonychia) emerger in this fly tying video produced by Tightline Productions. The Slate Drake is an important mayfly hatch, particularly in the Eastern US, with an emergence that can run from May through September….