Both. They were actually spawning. I had never seen it in "action" before. The male was vibrating next to the female and then the female would turn sidways, beat the gravel and release. We missed timing on those pics, didn't have the camera. Other than a few of them the rest were there to feed. They were rising regularly for bugs which was also great to see with that vantage point.
Northfork, hot flies were a black and brown maribou leech, double shrimp and cronimids.
Yeah, they call me "smiley" sometimes. Can't wipe the permanent grin I have