Heat, sewage pollution caused fish kill
Preliminary study by varsity department points to dip in oxygen level in the Karamana
The mass mortality of fish reported from the stretch of the Karamana, near the Thiruvallam and Pallathukadavu ghats last week, could have been caused by the unusual rise in water temperature, reduction in flow and a surge in the concentration of sewage pollution.
A preliminary study conducted by the Department of Aquatic Biology and Fisheries, University of Kerala, says the mass fish kill was due to an abrupt dip in the dissolved oxygen in water. Head of the Department A. Biju Kumar says the rise in temperature and reduction in water flow coincided with the summer.