Assessing the Bioaccumulation of Heavy Metals in Aquatic Ecosystems: Implications for Human Health and Sustainable Ecotourism Practices

Heavy metal contamination of aquatic ecosystems has emerged as a critical global environmental issue due to its persistence, toxicity, and capacity to accumulate within biological systems. Aquatic environments act as major sinks for heavy metals released from both natural processes and anthropogenic activities, including industrial discharge, agricultural runoff, urbanization, and mining. Once introduced, these metals are not degraded but instead undergo complex interactions with water, sediments, and living organisms. A key concern associated with heavy metal pollution is bioaccumulation, a process through which metals progressively concentrate in aquatic organisms over time, often leading to biomagnification across trophic levels of the food web. This phenomenon results in elevated metal concentrations in higher-level consumers, including fish and shellfish that are directly consumed by humans. The bioaccumulation of heavy metals poses serious ecological risks, affecting growth, reproduction, and survival of aquatic organisms, ultimately altering biodiversity and ecosystem functioning. From a human health perspective, chronic exposure to metal-contaminated aquatic food resources is associated with neurological disorders, renal dysfunction, cardiovascular diseases, and developmental impairments, particularly among vulnerable populations. Beyond ecological and health concerns, heavy metal contamination has significant implications for sustainable ecotourism