The smelts were formerly classed with the salmon family, but are now placed in a separate one, _Argentinidæ_, in which are included a number of allied species. To all external appearances the smelt is a true salmonid, and differs from the trouts and salmon chiefly in the form of the stomach and its appendages. The American or Atlantic smelt was first described by Dr. Mitchill, in 1815, from the vicinity of New York; he named it _mordax_, or "biting." Its habitat is along the Atlantic coast from the Gulf of St. Lawrence to Virginia, but it is most abundant northward. It islandlocked in a number of northern lakes. The smelt is a very pretty, graceful fish, with a long, slender body, long, pointed head, and large mouth, with a somewhat projecting lower jaw. The small adipose fin, which is peculiar to all of the salmonids, is situated far back, opposite the end of the anal fin; the caudal fin is deeply forked. Its color is pale olive-green above, silvery below, translucent, with an obscure, longitudinal, broad, satin-like band along the sides. The fins are greenish, with a few punctulations. The smelt enters the tidal rivers and brackish bays in the fall and winter in countless myriads, preparatory to spawning. It feeds principally on the small fry of other fishes, mostly at night, and along the shores in shallow water. It spawns in March, in both fresh and brackish water. The eggs are small, about twenty to the inch, and are adhesive. A medium-sized fish yields fifty thousand eggs, which hatch in two or three weeks, according to the temperature of the water, though usually in from sixteen to eighteen days. Though small, it is highly prized as a food-fish, having a delicate and delicious flavor. When fresh it emits an odor resembling that of cucumbers. Its usual size is from five to nine inches and weighing from two to four ounces, though occasionally reaching a foot or more in length. The smaller fish are more prized, the largest having a rank oily flavor. It is caught in large seines by fishermen and shipped fresh to the markets, and in winter is taken in great numbers with hook and line through the ice.