Pantnagar Journal of Research

Abstract

The study discusses the massive mortality of fishes from the mudflats of Point Calimere Wildlife Sanctuary Wetland in India during July 2023, and examined the possible causes of this phenomenon. The physicochemical properties of water indicated that there was an evidence of reduction in water level, reduced dissolved oxygen (DO), low salinity, and acidic pH. The DO concentration varied from 0.3 to 1.2 mg/l, pH fluctuated between 5.5 and 6.4 and temperature ranged between 24.2 and 31⁰C. As a result it was found that abrupt fluctuations in temperature and salinity lead to low DO, which caused mass mortality of fishes.