The Atka mackerel (Pleurogrammus monopterygius) is a mackerel in the family Hexagrammidae. Atka mackerel are common to the northern Pacific ocean, and are one of only two members of the genus Pleurogrammus - the other being the Arabesque greenling (Pleurogrammus azonus). The Atka mackerel was named for Atka Island (Atx̂ax̂ in Aleut), the largest island of the Andreanof islands, a branch of the Aleutians.