India, April 12 -- A decline in dissolved oxygen levels has been recorded in Pashan lake following the recent fish deaths, raising fresh concerns over water quality and pollution.

Water samples collected by the Pune Municipal Corporation's (PMC) Parvati laboratory on April 10 and submitted to the municipal commissioner show that while most chemical parameters remain largely unchanged, dissolved oxygen levels have dropped compared to earlier samples taken on December 27, 2025, and January 31, 2026.

Officials said low dissolved oxygen is harmful to aquatic life and is a key factor behind fish mortality.

The development comes amid reports of untreated sewage entering the lake, allegedly due to a malfunctioning sewage treatment plant, whic...