The scientific name of crayfish is Procambarus clarkii, which belongs to Crayfish, Procambarus and crayfish species. There are no subspecies under the species, but in the aquarium, the body color of some ornamental crayfish is different from that of conventional crayfish, such as orange neon red crayfish, blue ghost crayfish, yellow orange ghost or fireball crayfish and white ghost crayfish.

I. Species of crayfish

1, the scientific name of crayfish is Procambarus clarkii, which belongs to Arthropoda, Crustacea, Decapoda, Crayfish, and there are no subspecies (subspecies means that two exotic populations within a species are different from each other in classification, and the difference of individuals is at least 75% of the total population, that is, 75% of individuals in population A are different from all individuals in population B.

2. The body color of crayfish is generally red or dark red, but the body color of ornamental crayfish in the aquarium is different from that of conventional crayfish, such as neon red crayfish (orange), scarlet crayfish (dark red), ghost crayfish (blue), orange ghost or fireball crayfish (yellow) and white ghost crayfish (white).

Second, the specification division of crayfish

1, method 1

(1) Red shrimp: Xiaohong, weighing about 2-4 RMB. Medium red, weighing about 4-6 yuan. Bright red, weighing about 7-9 yuan. Red shrimps, weighing more than 1 2.

(2) Shrimp: Xiaoqing, weighing about 2-4 RMB. Zhongqing, weighing about 4-6 yuan. Daqing, the weight is about 7-9 yuan. Green shrimps, weighing more than 1 2.

2. Method 2

(1) Red shrimp: Kuxia, weighing about 10- 19g. Four-grade shrimp, weighing about 20-29g. The third-grade shrimp weighs about 30-39g. Secondary shrimp, weighing about 40-49g. First-class shrimp, weighing more than 50g.

(2) Macrobrachium nipponense: Macrobrachium nipponense, weighing about 10- 14g. Shrimp, weighing about 15- 19g. Shrimp, weighing about 20-29g. Macrobrachium nipponense, weighing over 30g.