Do mackerel have fins and scales?
There are many classes of fish which do not have scales nor
fins. The Agnatha has neither fins nor scales; the Condrichthye,
including sharkes, rays and skeats have fins but no scales; the
Ostichthyes, of which several families have members with the common
name, mackerel, with both scales and fins. The King Mackerel, S.
cavalla, has very tiny scales and fins.