In general, a pond can support between 50-100 pounds fo LMB per acre. The higher end being those ponds that are very fertile. So, let's go middle of the road and say your pond supports 75 pounds of LMB per acre, so together it supports 150 pounds of LMB.

How old is the pond? What is the stocking history of it? Answering these questions can perhaps give a better final answer.

Assuming anything in pond management usually isn't good. However, there is a high likelihood many if not most of your bigger bass were killed.