Wenzhou, Zhejiang River in China becomes RED river?

The river in Cangnan country Wenzhou, Zhejiang province July 24, 2014 didn't know what is the main cause why the river becomes red.

Villagers trash the polluted river in Ruian Zhejiang province on February 18, 2013

Because of over pollution and Hot weather 50,000 fishes died in Lake in Wuhan Central China Hubei province on July 2007.