The names of the swordfish all have reference to that prominent feature, the prolonged snout. The “swordfish” of our own tongue, the “zwardfis” of the Hollander, the Italian “sofia” and “pesce-spada,” the Spanish “espada” and “espadarte,” varied by “pez do spada” in Cuba, and the French “espadon,” “dard,” and “epee de mer,” are simply variations of one theme, repetitions of the “gladius” of ancient Italy and “xiphius,” the name by which Aristotle, the father of zoology, called the same fish twenty-three hundred years ago. The French “empereur” and the “imperador” and the “ocean kingfish” of the Spanish and French West Indies, carry out the same idea, for the Roman Emperor was always represented holding a drawn sword in his hand. The Portuguese names are “aguhao,” meaning “needle,” or “needle-fish.”
This species has been particularly fortunate in escaping the numerous redescriptions to which almost all widely distributed forms have been subjected. By the writers of antiquity it was spoken of under its Aristotelian name, and in the tenth edition of his Systema Naturæ, at the very inception of binomial nomenclative, Linnaeus called it Xiphias gladius. By this name it has been known ever since, and only one additional name is included in its synonym, Xiphias rondeletic of Leach.
The swordfish has been so long and so well known that its right to its peculiar name has seldom been infringed upon. The various species of Tetrapturus have sometimes shared its title, and this is not to be wondered at, since they closely resemble Xiphias gladius, and the appellative has frequently been applied to the family Xiphiidæ—the swordfish—which includes them all.
The name “bill-fish,” usually applied to our Tetrapturus albidus, a fish of the swordfish family, often taken on our coast, must be pronounced objectionable, since it is in many districts used for various species of Belonidæ, the garfishes or green-bones (Belone truncata and others), which are members of the same faunas. Spear-fish is a much better name.
The “sailfish,” Histiophorus americanus, is called by sailors in the South the “boohoo” or “woohoo.” This is evidently a corrupted form of “guebum,” a name, apparently of Indian origin, given to the same fish in Brazil. It is possible that Tetrapturus is also called “boohoo,” since the two genera are not sufficiently unlike to impress sailors with their differences. Blecker states that in Sumatra the Malays call the related species, H. gladius, by the name “Joohoo” (Juhu), a curious coincidence. The names may have been carried from the Malay Archipelago to South America, or vice versa, by mariners.
In Cuba the spear-fish are called “aguja” and “aguja de palada”; the sailfish, “aguja prieta” or “aguja valadora”; Tetrapturus albidus especially known as the “aguja blanca,” T. albidus as the “aguja de castro.”
In the West Indies and Florida the scabbard-fish or silvery hairy-tail, Trichiurus lepturus, a form allied to the Xiphias, though not resembling it closely in external appearance, is often called “swordfish.” The body of this fish is shaped like the blade of a saber, and its skin has a bright, metallic luster like that of polished steel, hence the name.
Swordfish are most abundant on the shoals near the shore and on the banks during the months of July and August; that they make their appearance on the frequented cruising-grounds between Montauk Point and the eastern part of Georges Banks sometime between the 25th of May and the 20th of June, and that they remain until the approach of cold weather in October and November. The dates of the first fish on the cruising-grounds referred to are recorded for three years, and are reasonably reliable: in 1875, June 20th; in 1877, June 10th; in 1878, June 14th.
South of the cruising-grounds the dates of arrival and departure are doubtless farther apart, the season being shorter north and east. There are no means of obtaining information, since the men engaged in this fishery are the only ones likely to remember the dates when the fish are seen.
The swordfish comes into our waters in pursuit of its food. At least this is the most probable explanation of its movements, since the duties of reproduction appear to be performed elsewhere. Like the tuna, the bluefish, the bonito, and the squiteague, they pursue and prey upon the schools of menhaden and mackerel, which are so abundant in the summer months. “When you see swordfish, you may know that mackerel are about,” said an old fisherman to me. “When you see the fin-back whale following food, there you may find swordfish,” said another. The swordfish also feeds upon squid, which are at times abundant on our banks.