Trachurus trachurus, commonly known as the Atlantic horse mackerel, is a pelagic fish species found in the northeast Atlantic Ocean. Recognizable by its elongated body and metallic blue-green back, it thrives in schools, feeding on small fish and crustaceans. It plays a crucial role in marine food webs.

The Trachurus trachurus, commonly known as the Atlantic horse mackerel, is native to the eastern Atlantic Ocean. Its geographical distribution extends from Iceland and Norway in the north, down the European coasts, through the Mediterranean and Black Sea, and as far south as Senegal in West Africa.

The Atlantic horse mackerel typically inhabits coastal and offshore waters. It is found in waters with a temperature range of 11°C to 16°C, often dwelling at depths of 50 to 200 meters, though it can be found at depths of up to 500 meters. It prefers environments with moderate to high salinity.

Trachurus trachurus plays a significant role in the marine ecosystem as both predator and prey. It feeds on small fish, crustaceans, and plankton, while also serving as a food source for larger predatory fish, seabirds, and marine mammals. The species is known for forming large schools, which is a behavior that aids in foraging and protection from predators.