"Demersal" refers to fish and other marine organisms that live and feed on or near the bottom of oceans, seas, or lakes. These creatures often inhabit areas like the continental shelf, where they can find food sources such as smaller fish, crustaceans, and mollusks. Common examples of demersal fish include cod, flounder, and haddock. Demersal species play a crucial role in the aquatic ecosystem, contributing to nutrient cycling and serving as prey for larger predators. They are often targeted in commercial fishing due to their economic value, leading to the need for sustainable practices to ensure their populations remain healthy.