It has a rather long, shapely body, with pointed head and an evenly curved profile. Its mouth is large, with projecting lower jaw. Both jaws are armed with narrow bands of sharp teeth and two canines, the upper ones directed forward. The predominating hue of the gag is brownish or brownish gray, with lighter sides, in deep-water specimens; those of shallow water, especially in grassy situations, are greenish or olivaceous, mottled with a darker shade, and more or less clouded. Very small and indistinct dusky spots sometimes cover the entire body, and a faint mustache is usually present. The dorsal fin is olive; the top of the soft dorsal fin rays is darker, with white edge; the caudal fin is bluish black, with white edge. It is a voracious fish, feeding on small fishes and crustaceans, and grows to a large size; twenty or thirty, or even fifty, pounds in weight is not uncommon, though usually taken of from six to ten pounds. It resorts, when large, to the banks and rocky reefs in deep water. Those of less size frequent the inshore waters. It is a fine food-fish, and a very game one on the rod. A light striped-bass rod, or the natural bamboo chum rod, with good multiplying reel and fifty yards of braided linen line, size E, and Sproat or O'Shaughnessy hooks, Nos. 3-0 or 4-0, on gimp snells, with a brass box-swivel for connecting snell and line, and a sinker adapted to the strength of the tide, make up the tackle for the gag. A large landing-net or a gaff-hook should not be forgotten. Rod fishing is done in comparatively deep water on the rocky reefs or shelly banks along the keys, from an anchored boat. Any natural bait, as a small fish, crab, crawfish, or conch, will answer, though a small fish, as the mullet, sardine, or anchovy, is the best. When of large size the gag is a very gamy fish, and must be handled very carefully to preserve one's tackle intact. It is taken more frequently by trolling with a strong hand-line from a sailing yacht, in the same way as trolling for bluefish. A small silvery fish is the best lure, though a strong spinner or a shell or block-tin squid answers well. Even a piece of bacon-rind cut in the semblance of a fish proves very attractive, in the manner commonly used by the fishermen of Key West in trolling for the kingfish.