I also shot a little underwater movie of a Damsel nymph swimming but I still need to figure out how to edit it and load it on Youtube.
One of the fish my friend caught this morning took the fly deep into it's gills and had to be killed. When opening its stomach it was stuffed with Damsel fly nymphs. The below patter has always worked for me when the fish are eating Damsel fly nymphs like this. Sadly I didn't have any of these patterns in my box this morning.