Thats a totally awesome video, much more interesting than a lot of the videos in fly shops that you pay $40 for. You're getting pretty good at this. Loved your underwater videos that you shot earlier this year. Keep working on it, you're doing great.
Really liked the way you composed the shot so that the viewer could see you off to the side, and the fly line arching over the water, settling on the water, and the fish taking the fly.
You already said you "mumbled". You might be able to edit the video to tone down the gurgling water, and boost the voice. Just a thought.