Demersal fish are species that live and feed on or near the bottom of oceans, seas, and lakes. They are typically found in deeper waters and include various types such as flatfish, cod, and haddock. These fish often have adaptations that help them thrive in their benthic habitats, such as flattened bodies or camouflage. These fish play a crucial role in marine ecosystems, serving as both predators and prey. They feed on smaller fish, crustaceans, and other organisms found on the seafloor. Demersal fish are also important for commercial fishing, contributing significantly to the global seafood supply.