What type of fish is caught by the old man in Hemingway's The Old Man and the Sea?

Marlin ;The Old Man and the Sea is a novel written by American author Ernest Hemingway, in 1951 in Cuba. It was the last major work of fiction to be produced by Hemingway and published in his lifetime. One of his most famous works, it centers upon Santiago, an aging fisherman who struggles with a giant marlin far out in the Gulf Stream.