[2]: 6 Marlins have elongated bodies, a spear-like snout or bill, and a long, rigid dorsal fin which extends forward to form a crest.

[3] The larger species include the Atlantic blue marlin, Makaira nigricans, which can reach 5 m (16 ft) in length and 820 kg (1,810 lb) in weight[4] and the black marlin, Istiompax indica, which can reach in excess of 5 m (16 ft) in length and 670 kg (1,480 lb) in weight.

On the 85th day, Santiago, the old fisherman, hooks a resolute marlin; what follows is a great struggle between man, sea creature, and the elements.

Frederick Forsyth's story "The Emperor", in the collection No Comebacks, tells of a bank manager named Murgatroyd, who catches a marlin and is acknowledged by the islanders of Mauritius as a master fisherman.

A marlin features prominently in the last chapter and climactic scenes of Christina Stead's The Man Who Loved Children.