An Adaptive Neuro-Fuzzy Inference System (ANFIS) to Predict of Cadmium (Cd) Concentrations in the Filyos River, Turkey Introduction Metals move to rivers from different sources, such as soils and rocks directly get exposed to surface waters, fallout of atmospheric particulate matter, decomposing dead organic matter, and from anthropological activities, including the release of refined and unrefined liquid wastes into the water resource In particular, releasing of Cd into the aquatic environment from industrial activities is a serious threat for the aquatic ecosystems