The researchers studied fish and crustacean diversity in a sandy beach habitat across four seasons. They found that fish diversity was highest during the southwest monsoon and lowest during the pre-monsoon season. The number of fish and crustacean individuals varied, with Liza subviridis being the most abundant fish species. Physical factors like water temperature and salinity influenced species diversity. Overall, the study showed that fish species play a significant role in the coastal ecosystem, and their composition and diversity change with the seasons.