It is a fish of the warm seas, approaching the shores for spawning and feeding when the temperature becomes suitable. It appears on the Gulf coast of Florida in March and April, though I have observed it as early as January in forward seasons. Its advent on the Atlantic coast is later, progressing gradually northward, reaching the vicinity of New York in July and August, and disappearing in October or November. Its breeding season in the Gulf of Mexico is in the early spring, and as late as August or September at the northern extent of its range. Its spawning may cover a period of many weeks, as the fish do not all mature at one and the same time. The eggs are quite small, about twenty-five to the inch, float at the surface, and hatch in a single day. The newly hatched fry are very small, about the tenth of an inch long, but in a year will have attained a length of six inches. The average weight of a mature fish is from two to four pounds, rarely exceeding six or eight pounds.
The Spanish mackerel is held in the highest esteem as a food-fish, being considered one of the very best, second only to the pompano of the Gulf or the whitefish of the Great Lakes. It has a mackerel flavor, but one peculiarly its own for richness and sapidity of savor. It is a game-fish of high degree, and worthy of the angler's highest regard. Its manner of fighting, when hooked, is mostly on the surface of the water, darting here and there with dazzling rapidity, in straight and curving lines, leaping into air, and bounding over the water with a velocity and nimbleness that is difficult to follow with the eye in the bright sunlight.
In northern waters it is usually taken by trolling with a small mother-of-pearl squid, or one of block tin, using a long hand-line, as the fish is rather shy and difficult to approach with a boat. In Florida, however, great sport can be had with a light rod, both in fly-fishing and bait-fishing, from the sand-spits at the entrance to deep inlets, and from the long piers and wharves that extend to deep water. The angling is done in March and April, when the fish are running into the bays in great schools on the flood tide, often in company with the salt-water trout.