Sludge in upstream area causing depletion of oxygen in water

Experts are debating bioremediation measures, including de-sledging the upstream areas of the Pathalam bund in the Periyar to avert fish deaths.
Mooting the idea of de-sludging the nearly 1-km upstream area, Bijoy Nandan, Associate Professor at the Cochin University of Science and Technology, said that partial bio-remediation measures could avert future fish deaths.