Flounders are benthic feeders, meaning they obtain and consume their food from the seafloor. Juveniles younger than two years old tend to be non-selective with their diet, feeding on mostly small assorted invertebrates and detritus (decomposing plant, animal and other organic matter) at the bottom of shallow mudflats. Their diet consists of mainly amphipods, but they also eat other small crustaceans, annelids, molluscs, and nematodes, which are funnelled into their mouth using their asymmetric jaw. This feeding technique also means that a lot of sand, rock fragments, mud and detritus is funnelled in as well.