The fish body is slender and oval, and the outline of the back of the head is round; The upper jaw is short and cannot reach the front edge backwards; There are four canine teeth on the upper and lower edges. The head is quite large, the back edge is slightly steep, slightly uniform and round, and the caudal fin is segmented. The body is dark blue. Small fish are light in color, with many irregular blue stripes on the upper part of the head and the base of pectoral fin, blue spots on the scales on the side of the body, and a black spot slightly larger than the pupil on the last two hard spines of dorsal fin. There are no blue spots on the head and scales of adult fish, but there is a blue saddle point about 4 scales wide and 5 scales long below the starting point of dorsal fin. Hard spine of dorsal fin 13, soft spine of dorsal fin 7, hard spine of gluteal fin 3, soft spine of gluteal fin 10. The body length can reach 100 cm.

The scientific name of fish in Tsing Yi is Shu's pig-toothed fish. There are many species in Tsing Yi, collectively referred to as "leading fish", and some are also called "leading fish". Its biggest feature is that the skull is a whole piece. Most other fish are covered with four bones. Hong Kong is called Tsing Yi, also known as the black-spotted porodon and the blue snapper in Tsing Yi. The common name is four-toothed shark, male-toothed shark, stone shark and Wei Qing shark, which is a kind of Cephalopoda of Perciformes. The model origin of this species is Sulawesi.