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The study provides a summary of information on the population dynamics of crustacean (isopod) parasites that were isolated from the fish Rastelliger kanagurta in Bhaucha Dhakka along west coast of Mumbai, India. The purpose of the study was to know the prevalence and severity of infestation of isopods during various seasons. The majority of the time, isopods parasitize the fish in warmer oceans. The report examines the altering of isopod population dynamics with the overall warming of the Arabian Sea brought on by climate change. Over the course of a year from May 2019 to April 2020, isopods were collected. Out of 185 Rastelliger kanagurta that were examined for infection, a total of 39 (27 females and 12 males) were found to be infected. The scope of the study is to examine the isopod intensity on fish and the factors that contribute to their spread, with the ultimate goal of improving the health and sustainability of the fish populations and the fishing industry.