Seasonal Dynamics of Water Quality Parameters Supporting Lates calcarifer in the Vasishta Godavari Estuary, India

Abstract

The health and sustainability of estuarine fish species like Lates calcarifer depend on the stability and quality of their aquatic environment. This study investigates seasonal variations pre-monsoon, monsoon, and post-monsoon in key water quality parameters in the Vasishta Godavari estuary near Narasapuram, Andhra Pradesh, India, over two years (2013–2015). Parameters analyzed include temperature, pH, dissolved oxygen (DO), salinity, alkalinity, and total hardness. Results indicate that while most parameters fall within suitable ranges for L. calcarifer, distinct seasonal trends influence habitat conditions. Pre-monsoon months showed elevated temperatures and salinity; monsoon seasons introduced freshwater inflow, reducing salinity and pH; post-monsoon conditions stabilized water chemistry but increased nutrient concentrations. This seasonal analysis enhances our understanding of L. calcarifer ecobiology and emphasizes the importance of seasonal monitoring for sustainable estuarine fisheries and aquaculture practices.