Biological filtration is a process used in aquaculture and water treatment systems to remove harmful contaminants from water using living organisms such as bacteria, algae, and plants. These organisms break down organic matter and metabolize pollutants into harmless substances through biochemical reactions. This process is essential for maintaining water quality and promoting environmental sustainability in aquatic environments. Biological filtration plays a key role in maintaining the health of aquatic ecosystems and is important for the success of aquaculture operations.