Have a one acre pond on my property, spring and rain water fed. Every spring I add Cutrine and a pond die to control algae, was done before I bought the place and by me for the last five years. Never had any issues til this week. Went to visit my son in NC and when I left Friday AM all was well. Came back last night and found three dead bass 11-13 inches and a 30 inch carp floating in the pond. This AM found a 9 inch bass and a 2 inch panfish. None of the fish showed any obvious injury and given the size of the carp and bass don't think it is the Heron that sometimes visits.
Any one with experience with something like this?