Microplastics are plastic particles with a size of 1 μm – 5 mm that are widely present in surface water and sediments. Increased exposure of microplastics in water can affect food chain cycles, leading to bioaccumulation and biomagnification in fish. This study aims to analyze the abundance, types, and polymer types of microplastics in surface water and fish in the Air Hitam River, Pekanbaru…