I have confirmed (to the best of my ability) that the water did indeed largely come from a bean field watershed.

Many large bass and a couple of my (less than 7) remaining grass carp are dead. They have now all sunk or otherwise disappeared. I saw no small fish, but have seen the one elusive white koi that has been the only fish I can spot from the bank, still swimming.

I checked my feeder and it was gummed up. In fixing it I allowed about 15 lbs of feed to spill into the pond. I saw no activity around the floating food. It would normally have caused a frenzy of bluegill, so that scares me.

I initially theorized that only the largest fish died because that’s all I saw. The white koi is the largest fish I’ve seen ever in my pond. I am now thinking that only the largest fish survived. What do you all think? What’s more likely to die, the large or small, from a herbicide runoff situation?

The positive: My pond has suffered from turbidity issues all year. It got muddy looking after this big rain. It has now cleared even better than after I did an alum/lime treatment a few years ago. However I had zero bites while fishing for an hour, so that scares me even more that nearly everything died. I normally see turtles all over too, and saw none.