Coastal tourism is a significant economic activity in Lekki and Epe mangroves in Nigeria. However, the presence of heavy metal pollutants in these areas due to uncontrolled industrialization and ecotourism-related pollution poses a potential risk to ecosystems. This paper examined the complex interplay between uncontrolled industrialization, ecotourism development, and fishery resources in coastal areas. Utilizing an eco-dynamical modelling approach, this paper quantified the impacts of these anthropogenic activities on fishery sustainability. Modelling incorporated key parameters such as the competitive rates of industrialization and ecotourism, mitigating effects on geometric increase in ecotourism and industrialization. Simulation results obtained using matlab showed the balance required to sustain fishery resources, showing that high levels of industrialization and ecotourism significantly degrade fishery stocks, while controlled development can mitigate these impacts. Specifically, Modelling demonstrated that fishery resources flourished under conditions where the adverse effects of ecotourism and industrialization are minimized. Findings highlight the need for strict regulations and sustainable coastal management to protect fishery resources. Hence, this will offer crucial insights for policymakers on integrating economic and ecological goals in the tourism context.