This is the first time I have seen it.

 The water from the agricultural water path in the countryside near my home has turned orange in color.

Yesterday, September 7th, the temperature dropped below 30 degrees for the first time in a long time, so I went on a bike ride through the countryside to observe wild birds.

When I arrived at the Drainage Bridge, I looked at the waterway and saw that the river surface range visible to the naked eye had turned orange, both upstream and downstream.

Although I've been watching this waterway for decades, this is the first time I've seen it.

I researched it up online and found that it is caused by changes in a microorganism called Euglena Sanguinea caused by the high temperature.                                                                                                                                                                         (Captured by my phone)