So I bought a farm with a nice 1.5 acre pond on it that is over 30 years old. The dam has the spillover pipe sticking 10 ft above the water level. The dam is grown over with autumn olive too thick to walk.

The dam might have a leak in it. I'm not sure.

I fished it for the first time today not knowing it even had fish at all. Caught about ten tiny 4" -5" crappie in an hour.

What can I do to get bigger crappies (big enough to eat) and manage this pond better?

Any help is appreciated.