The mass death follows similar incidents last week in which a total of 60,000 fish were found dead in the waters of Shamirpet lake and Medchal lake on the outskirts of the city.
Local officials claim the fish succumbed to a bacterial infection caused by high temperatures – but environmental activists insist responsibility lies with domestic and industrial polluters.
Speaking to the Times of India, environmental expert Prof K Purushotham Reddy said: “Lakes and [water] tanks around city are becoming a deadly mix of domestic sewage, municipal waste and hazardous waste dumped irresponsibly by industries. When it rains, all this flows into lakes and tanks."
“Since these wastes contain all kinds of acids, plastics and chemicals, the subsequent reactions reduce the level of dissolved oxygen in water which makes it impossible for fish to survive.”
Members of a local fishermen’s cooperative refuse to place the blame squarely on industrial chemical plants surrounding the lake. They point to the area’s increasing urbanization as well as the fact that Rampally is at the apex of three interconnected lakes which are all similarly polluted.