I have had none to very little recruitment of bass in my pond over the last year (unlike you, I want them tho). Couple things that I might suspect: GSF are taking out the fry, RBT are stocked in the fall and they might be going after them in the spring like the do minnows, and I have CC. I know this might not help you much, but thought I'd throw it out there. I also have a heron around a lot lately.

Can you run a net thru the pond?