Re: [VFB] Unknown Bugs? Pictures & Video

[DonO]

Those look like mayfly nymphs, perhaps Ephermera simulans , otherwise known as the Brown Drake. Your nymph looks very similar, except that the gills are darker.  Other than that, I see very little difference. I'm comparing your photos to a photo in 'Selective Trout'.  I remembered it from previous encounters with similar nymphs in high lakes in Wyoming, and using the photo to tie the nymph.   DonO