I am far from an expert in this, but I am pretty confident that you have enough BG in the pond even now that you found out it is bigger than you originally thought. The BG should pull off one heck of a spawn this spring and will quickly fill the void. If you intended goal is to grow some huge bass, the fewer bass you have in the pond the better. I don't think you will have to harvest bass until the year after you see your first reproduction happen in your pond. At that time you want to start removing the first generation of bass born in you pond. You don't want to remove the original stocker fish. Just the ones born in your pond and remove lots of them if your goal is big bass...
