Coastal mangroves serve various ecological and socio-economic functions, including as a driver of the coastal blue economy in the Northern Indian Ocean; hence, they are crucial to achieving the United Nations Sustainable Development Goals (SDGs). Sundarbans, the world’s largest contiguous mangrove forest, a UNESCO World Heritage Site, and a RAMSAR site formed on the delta of Ganga-Brahmaputra-Meghna, faces the northeast coastal Bay of Bengal (BoB). This ecosystem is key to the sustenance of the blue economy in the Bay of Bengal, including BoB rim countries. The coastal Indian Sundarbans is intensively used for aquaculture practices, leading to continuous anthropogenic stressors, including the release of pollutants. Moreover, such aquaculture practices are considered to unsustainable and can cause irreversible damage to the health of coastal oceans. In the present study, the efficacy of mangrove vegetation planted along the boundaries of aquaculture ponds in Sundarbans (integrated mangrove aquaculture-IMA) has been evaluated by investigating the role of mangrove leaf-derived phenolic groups (tannic and gallic acids) that can contribute significantly to carbon and nitrogen pools leading to better coastal bioresources yield. The values of dissolved inorganic nitrogen (50-300µM), o-phosphate (0.5-10µM), reactive silicate (10-80 µM), dissolved organic carbon (37 mg/L – 80 mg/L) exhibited wide variation, indicating a strong influence of anthropogenic forcings in recent years, and that the breakdown of mangrove leaf litter favored the ecological stoichiometry. The observed higher concentration of tannic acid encountered during the studied period highlighted alteration in the nitrogen cycle and showed that tannic and gallic acids maintained water quality and may have ultimately led to improved yield of coastal bioresources in the IMA pond. The current study provides a new approach to nature-based solutions (NbS) and for improving the income of aquaculture practitioners through a sustainable blue economy.