This is not the first massive die off of fish in recent history. Here’s one, here’s one, and this one is right down the street. I am not going to go on a tirade about Global Warming, because I just don’t know. What I do know that massive numbers of of animals dying at one place, and one time is not a sign of a healthy biosphere. Some attribute it to low oxygen in the water, others high temperatures (which leads to low oxygen).
We aren’t just talking fish either. This website tracks the progress JUST THIS YEAR, the strangest is the dropping from the sky in Arkansas. Weird stuff.