Hybrids can not through reproduction with their own produce offspring that go back (revert)to the original parentals (GSF or CNBG) genetics. Hybrid lepomis exhibit outbreeding depression in the F2 and subsequent generations. That is why all of the fisheries scientists I am aware of state that HBG offspring are not a good thing in a pond. All of the HBG pond plans I am aware of are based on the idea that the predator fish need to be able to eat all the HBG offspring and that over time it will be necessary to restock HBG. The idea is to put them in grow them to size and fish them out while the predators eat all the offspring. Below is a pic of an FX GG.
If there are enough pure CNBG stocked with HBG then over time the CNBG will out produce the HBG and leave you with a CNBG population. They will not be crosses(hybrids). CNBG produce lots of babies 30 to 50 thousand a year while HBG if they spawn successfully will have only a few (1000 +-) babies a year.
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