Body length, flat side, slightly raised back, blunt and round back and abdomen; The head is of medium size and slightly pointed. The body length can reach 102 cm, the general weight is 1.5-2.5 kg, and the largest individual can reach more than 15 kg.
The fishes of Trachidae are divided into three families: temperate bass, of which four species are from Canada, namely American bass, golden-eyed bass, striped bass and sawfish; Molas, of which 12 species are produced in Canada, including sea bass, rock bass and small-mouthed sea bass; Sea bass family, including three species from Canada, namely yellow fin bass, sea bass and snow bass.
As can be seen from the above classification, some species are not called bass, and anglers often use this name to refer to other species of fish. Sea bass of temperate bass family live in seawater, brackish water and fresh water in eastern Canada, and striped bass has begun to live in the coastal areas of British Columbia since its introduction.
Similar to Japanese bass, it has teeth and spiny fins in its mouth. Generally, there are 1 gill cover fin and 2 dorsal fins, in which the dorsal fin of soft fin is separated from the spiny dorsal fin. The species of this family are usually used for fishing and less for commercial fishing. Sunfish and perch are mostly found in southern freshwater lakes and warm and slow-moving streams. It originated in the eastern waters and was introduced into the Pacific waters.
There are rows of teeth in the mouth, continuous dorsal fin, comb-shaped scales, and feed on fish such as insects and crayfish. Among them, sea bass and small mouth sea bass are important aquatic species in Canada. The species of sea bass are mostly found in the Atlantic coast, but little is known about them at present, among which the yellow-finned bass was recently discovered in Canadian waters.