[2] Mackerels have a round body that narrows into the tail after the second dorsal fin, similar to a tuna fish.

[citation needed] Throughout the lives of these mackerel, they tend to stay in areas within a few degrees of 10 °C (50 °F)[4] in tropical to subtropical waters.

[citation needed] The blue mackerel is known as a voracious and indiscriminate carnivore, devouring microscopic plankton, krill, anchovies, and dead cut bait, and striking readily on lures and other flies.

When in a school and in a feeding frenzy, blue mackerel will strike at nonfood items such as cigarette butts and even bare hooks.

Due to their eating habits and their diurnal lifestyles, blue mackerel have evolved large eyes with higher sensitivity in their retinas.

The East Australian Current can carry eggs and larvae away from the original spawning grounds, broadening the area in which blue mackerel are located.