Pacific Ocean

Pacific Mackerel (Scomber japonicas), also known as Chub Mackerel, Spanish Mackerel; weight – more than 2.7 kg (6 lb); length – up to 63 cm (25 in); lifespan – up to 18 years. Pacific Mackerel feed on plankton (tiny floating plants and animals) and the younger stages of all the pelagic species such as anchovies and sardines, as well as their own young. The head is dark blue, the back is dark blue with about 30 dark wavy lines, and the undersides are silver green. Image courtesy of NOAA.