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Atlantic Mackerel (Scomber scombrus), an important Atlantic Ocean commercial fish, also known as Mackerel, Common Mackerel, Boston Mackerel, Caballa; weight – 1 kg (2.2 lb); length – up to 42 cm (16.5 in); lifespan – up to 20 years. Atlantic Mackerel feed heavily on crustaceans such as copepods, krill, and shrimp. Image courtesy of NOAA.