The Kansas Dept of Wildlife used Florida strain LM for their brood stock until a few years back. When they started testing LM in lakes they had stocked, they were not finding any genes from the florida strain LM. Apparently the Florida LM were not surviving our winters. The Northern strain LM are all KDWP has in their brood stock now. Alot of money and time was wasted stocking the Florida's here in Kansas. I know you are in Texas and the Florida LM are doing fine there. I am not a biologist so I am not sure if your native bass will breed with the Florida's to create the F1 or if that is done in labs.