It is possible that you could have quite a few hybrid bluegill babies if there are minimal predators. Example: with 100 HBG, let's assume that you have 90% males, which leaves about 10 female HBG. Young female HBG of 5" would have maybe 3000 - 6000 eggs times 10 females gives 30000 to 60000 eggs. Note -I could not find a lot of information about how many eggs a young, female hybrid bluegill will have. A 5" female greenie and bluegill will have an average of 6000-11000 eggs. Since these are hybrids lets say there is a low 15% hatch rate for the eggs which equals 4500 to 9000 fry for all 10 females. Without predation lets assume a 40% fry survival rate to fingerling size 1"-2" which equals 1800 to 3600 F2 hybrid bluegill. This is maybe why you are seeing quite a few offspring from your HBG with minimal predation.
