Hm...it was a pretty nice day yesterday...a bit breezy, but not bad.
The fish locally seemed to be on the cold-water sluggish side. I still caught some crappies during my lunch hour.
Since you say "the fly I used" and not "the fly that caught all the fish"...and why would you be so willing to give away flies that actually caught fish...I was going to guess 0 fish, even though I know you're a great fisherman. But, I also know that if you aren't catching fish, you will change flies, so if you stuck with one fly you MUST have been catching fish.
Hmmmm. I bet you really got into 'em. I will guess you caught 78.