Also known as Brown-striped Macerel Scad, Japanese Scad, Mackerel Scad, Mexican Scad, Southern Mackerel Scad, Stonebrass, Stonebrass Scad, Temperate Scad.
Found in schools, both over inshore, and in oceanic waters.
They feed on planktonic invertebrates.
Length - 35cm
Depth - 1-320m
Jacks are fast swimming fish that can roam over great distances. The larger fish hunt other fish and the smaller fish eat zooplankton. In turn they are hunted by large Tuna and Dolphins. Ref: https://www.fishbase.se/summary/12302