The rock-bass was first described by the French naturalist, Rafinesque, in 1817, while travelling in America. His specimens were from New York and Vermont, which he named _rupestris_, "living among rocks." In the Northern states it is generally known as the rock-bass, but in Kentucky and other states of the Middle West it is called red-eye, goggle-eye, etc. Its original habitat was from Canada and Lake Champlain southward along the Mississippi Valley to Louisiana and Texas, but its range has been extended to many other states east and west by transplantation. In its general appearance it resembles somewhat the black-bass, but it is a deeper fish and is more compressed. Its dorsal and anal fins are comparatively larger and stronger. It has a large eye and a capacious mouth well filled with small teeth, some on the roof of the mouth being rather sharp. The color is of various shades of olive-green, with brassy or coppery reflection, more or less mottled with black, forming broken and indistinct lines along the sides. The iris of the eye is scarlet, hence "red-eye"; there is a black spot on the angle of the gill-cover and dark mottlings on the soft dorsal, anal, and caudal fins. It prefers clear streams and lakes, and congregates in small schools about rocky situations, gravelly bars, about mill-dams, and in the vicinity of weed patches in ponds. It spawns in the spring and early summer, making and guarding its nest like the black-bass, and feeds on crawfish, small minnows, and insect larvæ. In size it usually runs from a half-pound to a pound in streams, though reaching two pounds or more in lakes. It is a good pan-fish for the table, and is well thought of in the Mississippi Valley, though held in lighter esteem in the St. Lawrence basin, where it coexists with larger and better fishes. The rock-bass is an attractive-looking fish, and for its size is very pugnacious. It will take the artificial fly, or natural or artificial bait. It bites freely at small minnows, grubs, grasshoppers, cut-bait, or angle-worms. It is capable of affording considerable sport with light tackle, owing to its large and strong fins, and its habit of curling its sides in opposition to the strain of the rod.