Piranha and freshwater pomfret are similar in body shape. The main difference is that the upper and lower jaw teeth of freshwater pomfret each have 2 rows. The teeth are flat and wide, and the first row of the lower jaw only has 12-14 teeth. 2 in the second row; when the mouth is closed, the upper and lower jaw teeth are in parallel contact. The piranha has only one row of teeth in the upper and lower jaws, which are sharp and triangular. There are 28-31 teeth in the lower jaw; when the upper and lower jaws are closed, they fit together in a jagged shape.

Freshwater white pomfret, scientific name is Cyprinidae, suborder Cyprinidae, Cyprinidae, Cyprinae subfamily, Cyprinidae genus. Native to the Amazon River in South America, it is a tropical and subtropical fish. Freshwater white pomfret (hereinafter referred to as freshwater pomfret) has the characteristics of diverse feeding habits, fast growth, large size, few diseases, easy fishing, thick meat with less thorns, delicious taste, and rich nutrition. It is an ideal choice for expanding pond culture objects and increasing output per unit area. A valuable fish, it can also be used as an ornamental fish in its juvenile stage. Freshwater pomfret was introduced to Taiwan Province of China in 1982. After successful artificial breeding, its culture began to be promoted in freshwater fish ponds. In 1985, it was introduced from Taiwan Province via Hong Kong to Guangdong Province for trial breeding. In 1987, it was successfully artificially propagated. After that, it was gradually promoted across the country and became one of the famous and special varieties with the highest annual output.

Piranha is a kind of fish distributed in the Amazon River in South America, belonging to the suborder Cyprinidae, Cyprinidae, and the genus Cyprinidae. It is a type of piranha. There are nearly 56 species of piranhas, belonging to the subfamily Cyprinidae of the family Cyprinidae. According to different feeding habits, they can be divided into two types: herbivorous and carnivorous. The carnivorous man-eating pomfret is named nattereri, that is, Nattereri. The fish is 30 cm long (excluding tail fin). Mainly distributed in rivers east of the Andes to the Brazilian plains. In addition to the Amazon River, the Cuiabá and Orinoco rivers are also its main producing areas. It is now located in the Amazon River Basin of South America, distributed in Argentina and Brazil.