OOOPS! I missed the fish population question. The best way to determine what is in the pond is to fish it. See how many bass you catch as well as catfish and bluegill. A farm pond is like raising cattle, you have to harvest some each year to allow the younger ones some room to grow. Harvest those small 8" - 10" bass as well as a slug of perch. Harvest 15 -20 perch for every bass you take. If all the perch are 5-6" then throw them on the bank and let the coons feast on them. Plant some under your tomatoes or flowers just get rid of them

If you have anything else to ask then holler.

Be good.