I know harvest and fertilization are the backbone, and way more important, and I intend to do those, but

If I have an old pond in NC, 1.6 acres, that is stereotypical in that it's mostly small bass, a couple of donkeys, and big bream, and I'm seriously considering f1's...

How many do I add? I know a ton of them will be eaten, but I want some to grow and pass on their genetics.