This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
Taxon on Mar 30, 2017March 30th, 2017, 2:19 pm EDT
Welcome to this forum. In my opinion, a fly tied on a jig hook certainly qualifies as a fly.
As to your question about what amount of marabou to use, I believe that pretty much depends on the fly pattern you are tying, i.e. what you are trying to imitate, and perhaps other factors, such as water clarity, etc. Hope this helps.
PABrownie on Mar 31, 2017March 31st, 2017, 4:26 am EDT
Many modern nymphs are tied on jig hooks, as far as your marabou goes, do they work? The amount you use should be directly related to its fish catching abilities and not related to what everyone else is doing ;)