pomatomus saitatrix
Webster's Dictionary (GCIDE)
Bluefish \Blue"fish`\, n. (Zool.)
1.A large voracious fish (Pomatomus saitatrix), of the family Carangid[ae], valued as a food fish, and widely distributed on the American coast. On the New Jersey and Rhode Island coast it is called the horse mackerel, in Virginia saltwater tailor, or skipjack. [1913 Webster]
2.A West Indian fish (Platyglossus radiatus), of the family Labrid[ae]. [1913 Webster]
Note: The name is applied locally to other species of fishes; as the cunner, sea bass, squeteague, etc. [1913 Webster]