Why do mackeral have scales?

Question

Why do mackeral have scales?

Answer 1

Mackerel don't have scales, they are a smooth skinned fish. Ok, technically they do have scales, but they are tiny and you can barely tell they are there, that why most people filet/steak mackerel with the skin on and just don't eat the skin after cooking.

The scales are even smaller than those on trout.

Answer 2

The same reasons just about all fish have scales: protection and to allow a smooth flow of water over the body so they can swim with less effort (kind of like the new swimsuits they're using in the Olympics).