Farmall concerning you not catching any fish for years, now it is easy, and you don't know where the GSF came from. If the ones you caught are pretty representative of size, maybe the GSF did not get into the pond until the last year or so. It would have only taken a couple of fish, male and female, to spawn a lot of GSF fry.
I'm just speculating. But for the size of the caught GSF you were holding in your hand, they could have been spawned last year or the year before.
Snrub,
That is certainly possible. My concern now is I don't want to over populate the pond. That's the biggest reason I didn't stock more than I did. I've heard it said for every fish you see, there are 20 you don't see. If that's the case, I've got a bunch of fish in there, but none of what we're seeing is big enough to catch and eat. Plus, I want some Tilapia to clean up my pond. I've got some thinking to do. Any Ideas?
