OK. But respectfully, Jeff, all you can conclude from your 'experiment' is that you don't know if you did or didn't have any kind of fish kill for any kind of reason.

When you have a pond, as a minor example, you see dead fish all the time. Does any of it mean you had a fish kill?

I think when you see no dead fish, what you can safely conclude is....I don't know if I had any kind of a fish kill or not.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."