Lets see . No stocking in many years. No known sellers of GSF. Stunted LMB (perfect size to wipe out 3-4in lepomis - normal GSF size). Low reproduction by GSF (2-10M) when compared to BG (50-80M) and LMB (15-20M). The one lepomis caught is a pure GSF. Must be Magic.

Or as Dave says "human assistance was involved". I assume that since it is described as a stock tank there is no stream influence. It would be good to see what a seine survey shows. Theories ?