Yet another example of DO level dropping so low that fish were killed. 

Punjab: Hundreds of fish die in Kali Bein Days after the water supply from the Mukerian hydel channel was snapped, hundreds of fish have died in the Kali Bein at Sultanpur Lodhi.

Environmentalist Balbir Singh Seechewal said, “It is the fourth time that this is happening. The water flow from the Mukerian hydel channel was stopped on April 17.

We had informed the PPCB that the pollutants from the toxic discharges into the Bein might kill the fish. While officials came to visit the spot, fresh water in the Bein was still not released. The level of the oxygen in the water has been reduced to 0.4 mg/L. Dead fish began turning up yesterday. The number is likely to rise tomorrow.

The toxic discharges from the Bhalane Dian Colonian and the partially operational STP, Kapurthala, have also choked the Bein. Without fresh water, the fish die due to the toxic discharge.