Fish waste is a crucial aspect of aquaculture and fisheries management that often goes unnoticed by the general public. It encompasses various by-products generated throughout the fish production process, including uneaten feed, excretions, and other organic matter. A valuable tool in comprehending the intricate dynamics of fish waste is the fish poop chart, which visually represents the nutrient composition and ecological impact of different species’ excretions, aiding researchers and aquaculturists in making informed decisions for a more efficient and eco-friendly industry. Understanding fish waste is essential for maintaining a sustainable and environmentally responsible approach to fisheries and aquaculture.