The mackerel fish does have scales as an outer covering. The mackerel is a fish that can be eaten without removing the scales, though. The scales are so small, it does not cause a problem for eating.
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.
The fish is kosher, since it has fins and scales, but may NOT be prepared the kosher way.
Yes all tuna have fins and scales
Yes all species of Tuna have both scales and fins.
Most. There are very few fish that have no scales and all fish have fins.
No it does not have scales, and yes, it has fins
Yes, they do have both fins and scales.
Mackerel
Yes, the Spanish mackerel has scales. These scales which only partly cover this species, are so small however that they are frequently overlooked. Many fish, such as tuna, herring and mackerel, shed their scales when removed from the water.
Yes, it is a kosher fish. It has scales and fins.
Mackerel meets the halachic (Jewish law) requirements for being a kosher fish because it actually does have both fins and scales - when the fish is netted, it sheds its scales. It is, therefore, a kosher fish.
Tilapia fish has fins and scales like any other fish. The tilapis fins and scales are less difficult to remove.