Under the circumstances, my first thought, too. They have poisoning food and water plans.
Birds drank the water then the fish died of the same poison?
Location of dead fish most likely poisoning spot. birds drank and died later.
Pure speculation by me. No basis in facts I may have. I don’t
I would go with a toxin being released also, volcanic activity seems unlikely in that area and radiation is normally a slower death. Even with most toxins animals die at different rates. This is interesting, whatever it was must of been pretty concentrated.
I was thinking last night about it and trying to figure it out. If it was poisoning how could they be 125 miles apart?Your analogy is excellent.