The GSF will only spawn annually. And 99% of them will be eaten. But then, only about 1% of fish ever reach maturity.
Admittedly, I'm a GSF fan. They outfight a BG every time.
When my uncle built his 5 acre lake about 9yrs ago. There was a small pond that got flooded in the process. We stocked CNBG, RE, FHM, LMB, and a small amount of Hybrid Crappie.
In the first few years we caught A LOT of GSF. More of them than any other fish if I had to guess. All of them with that large gsf mouth. I have fished this lake a bunch this year and not caught one fish with that large mouth. What I am catching with some frequency now are large crosses like this one. Picture does not do this fish justice. The coloring on the fins was beautiful. It was 10" long, weighed 13oz, hit a big skitterwalk topwater lure and pulled like mule.
