Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations Minor fish kill?

All that seems plausible. Generally speaking if you have a fish kill that kills multiple species you are dealing with either an oxygen depletion or a organic toxin that went through your system.

Yes hot water temps can definitely effect your perch but shouldn't effect your bluegill.

If you aren't seeing any odd behavior start looking for an introduction of some foreign body that killed fish.

My money is still on oxygen depletion.