We had a careless crop duster spray our pasture, waterways, and pond. I called the State and they sent someone out to take samples for testing. Certain chemicals are regulated and can't be used in watersheds. If a professional lawn service messed up and caused the kill they could be covered with insurance. You won't get those fish back but you might get them replaced. And IF that's what happened there would probably be less chances of it happening again if a claim was filed.

19 acre watershed pond
LMB, BC/WC, Bluegill, Crawfish, GShiners