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h i g h l i g h t s• In India, this is the first-ever assessment, which offer an insight on the accumulation of bacteria in farmed oysters.• We investigated the dynamic process of microbial bio-accumulation and how it is influenced by rainfall.• Bio-accumulation was high during the pre-monsoon season when the Lake is brackish.• Salinity and temperature play a major role in the survival of coliform bacteria in the shellfish growing water.• We can reduce input costs in the laboratory by analysing faecal coliform as a quality indicator instead of using E. coli as an indicator. a r t i c l e i n f o

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