Stocking Florida bass on top of a Fx population will NOT maintain hybrid vigor. Once the population is Fx, the new Florida fish can either spawn with other new Florida fish, making Florida fish, or they can spawn with Fx fish, making Fx fish. The only way to make an F1 hybrid is for Florida and Northern bass to spawn together. Even if you replaced 50% of the Fx bass population with Florida bass, you'll end up with 25% Florida bass by generation 1, and 6% Florida bass by generation 2, with nearly all fish Fx by generation 3.
Generation Fl No F1 Fx
Refresher 50.00 0.00 0.00 50.00
Gen 1 (%) 25.00 0.00 0.00 75.00
Gen 2 (%) 6.25 0.00 0.00 93.75
Gen 3 (%) 0.39 0.00 0.00 99.61
Short of frequently removing large numbers of small Fx bass and stocking pure or F1 bass, the population will always shift to an Fx population in just a few genreations.
