I have a very small pond/water hole, about 60’x75’. Its about 7 years old and all good up until Sunday. It has a few bass and several crappie that have lived there since shortly after construction. They both reproduce. Sunday I visited and found about twenty dead fish, all about 2-3” long. There were plenty of other same size fish swimming about normally. Also saw a couple of the bigger fish as well. Here in SE Georgia we have an abundance of rainfall this winter. Pond water is clear and steady running out the standing drain.
Any ideas on a cause for the dieoff?

Thank any replies.