Scales are the fishes protection and they serve the same/similar purposes as fur or hair in mammals. The fins are used for balance, propulsion/locomotion and display as are the limbs in mammals
No it does not have scales, and yes, it has fins
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.
Yes all tuna have fins and scales
Tilapia fish has fins and scales like any other fish. The tilapis fins and scales are less difficult to remove.
Yes all species of Tuna have both scales and fins.
Fish that do not have fins and scales include lampreys and hagfish.
Most. There are very few fish that have no scales and all fish have fins.
Pacu are a type of piranha. They do have scales, like most fish, as well as fins.
Yes, the tilapia fish has both fins and scales. Like most bony fish, tilapia possesses paired fins (pectoral and pelvic) as well as unpaired fins (dorsal and anal fins). Additionally, it is covered with scales, which are typical characteristics of many fish species.
Yes it does
Yes
Yes, Salmon do have fins and scales like most fish (although som fish, like catfish, do not have scales). I have never heard of a fish without fins, although eels have less fins than many other fish. The scales tend to be small and most fish vendors will sell salmon fillets with the skin and scales still on (although some people think the scales are unpleasant).