1. Breeding facilities: cement ponds or water tanks are mostly used for breeding Portunus trituberculatus larvae, either indoors or outdoors, but in the case of indoor ponds, transparent materials (such as glass or glass fiber reinforced plastic tiles, etc.) are used. ) is what the roof needs. The volume of cement pool or water tank is 20 ~ 60m3, and the water depth is1~1.5m. Rectangular shape is better. The swimming pool should be equipped with water intake and drainage, water filtration, aeration and other devices. Depending on the local water temperature, it is decided whether to add heating facilities. The bottom of the pond should have a large slope, generally 1.5% ~ 3.0%, and the bottom drain valve should be large enough with a diameter of 100 ~ 150 mm, so as to facilitate the crab seedlings to leave the pond. In some areas, soil ponds are also used for larval cultivation, and in some areas, at the end of the cultivation stage, they are moved into cement ponds by light trapping to continue the cultivation of megalopa. At present, shrimp, river crab and even shellfish culture facilities in coastal areas of China can carry out artificial culture of Portunus trituberculatus.

In the culture facilities of Portunus trituberculatus, there should be a certain proportion of single-cell algae culture ponds, rotifer culture ponds and Artemia incubation ponds. In addition, there are larval culture ponds, and the water ratio of the four ponds is roughly1:0.2: 0.1:0.1. It is best to set up a preheating pool, and the water ratio of the larval cultivation pool to the preheating pool is 5: 1, so as to ensure the water exchange temperature.

2. Disinfection and treatment: Disinfection includes disinfection and cleaning of nursery ponds and nursery water. All newly-built cement ponds, because of their strong alkalinity, will affect the development of larvae and need to be soaked in water for about 1 month. If the time is tight, adding a small amount of industrial hydrochloric acid can shorten the soaking time. 20 grams of potassium permanganate should be added to each cubic meter of water, and the bottom and wall of the cement pool should be washed before seedling raising.

Diseases have a great influence on larval rearing. Bacteria, parasites and fish and shrimp larvae in seawater are harmful to larvae. Therefore, the seedling water must be treated. It is simpler to filter with a sieve, which can remove some harmful organisms. In the early stage of seedling raising, 150 mesh screen can be used for filtration. 80 mesh sieve can be used in larval stage. Using sand filter to filter seawater can prevent plankton and organic debris from passing through, and the effect is ideal. Chemical disinfection is the most thorough. Generally, water containing available chlorine 8% ~ 120 ~ 150g/m3 is added to the seedling water for disinfection. 12 hours later, add an appropriate amount of sodium thiosulfate to eliminate residual chlorine. Because sodium thiosulfate consumes dissolved oxygen in water, it is necessary to aerate the water after chlorine removal.

The above is a summary of the breeding facilities and disinfection technology of Portunus trituberculatus larvae, hoping to help you in the breeding process.