You're right about the F1's, their F2, F3, etc. offspring don't retain their superior genetics, nor their hybrid vigor. If you want consistent double-digit Bass, you'll probably have to stock new F1's every year or every other year. I agree with what lmoore said above. If you have enough 3.5-4lb bass already, Gizzard Shad is definitely an option. You need a certain percentage of your bass to be over this number, otherwise they won't be able to control the Gizzard Shad and they'll end up taking over your pond/lake. I'm not sure what that percentage is, but the bass experts will probably chime in here soon.
