actually i think the tiger striped mackerel are Atlantic mackerel
http://en.wikipedia.org/wiki/Atlantic_mackerel
EDIT..... The
chub mackerel,
Scomber japonicus, also known as the
Pacific mackerel or
blue mackerel and sometimes referred to as a "hardhead" or "bullseye", closely resembles the
Atlantic mackerel (Scomber scombrus)
doh!!!!!