I had to restock my Missouri pond with Bass last year. No one can explain but essentially every bass in a 3 1/2 acre deep pond died. The BG and CC and GC all were un affected. But to the issue...I restocked with 3-4 inch LMB last June, by November, the largest were 8-10 inches, the smallest 5-6.
They have a huge amount of forage with many age classes of BG available to them. And this spring there was a spawn from some of the bass.