Fiddler crabs play an important role in the food chain and nitrogen cycle in the mangrove ecosystem. The waters of the Musi River Estuary receive flow from the Musi River and are affected by land activities such as industry, agriculture, plantations and which can pollute the environment. This study aims to measure the levels of lead (Pb) and copper (Cu) in fiddler crabs (Uca spp.) and assess th…