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I'd have to say it is a cross breed of gill and rock bass
I believe its a green sunfish on its own or a hybrid green sunfish and gill. You can buy the hybrids for stocking, my grandfather has them in his pond. Georgia giants I think there referred too.
Yes i purchased mine at local hatchery 3-4 yrs ago just about breed out know must have to add a few every yr think i might get more this spring?