The hepatopancreas-transferring period of penaeus vannameiis one of the most important period.Thehepatopancreas are the chemical plant of the penaeusvannamei, which responsible forsecretion,detoxification,immunity,hematopoiesis,detoxificationand physiological regulation of digestive enzymes. Even a small problem happening during the hepatopancreas-transferring period will affect the future whole life activities of the vannamei, and even lead to its death.
In general, when the shrimp seedling has been carefully cared for more than 20 days, or when its body grows up to 4-6 cm, a white covering will be formed around the hepatopancreas, and after the white covering disappears, the covering of the hepatopancreas will turn brown. The above process is called hepatopancreas-transferring period.
In the hepatopancreastransferring period, in addition to paying attention to how to protect and care about the hepatopancreas, the pond bottom quality is also an important aspect. Since the temperature during the hepatopancreas-transferring period is already relatively high and the water temperature is above 25°C, bad control of the pond quality will cause the bottom heat with a large amount of toxic and harmful substances like hydrogen sulfide and methane in the bottom spilling into the water, which directly harm the health of hepatopancreas of vannamei. Therefore, we need to use the oxidative base to oxidize the bottom organic matter during the hepatopancreas-transferring period to reduce the generation of harmful substances at the bottom and prevent the bottom heat.
It is also very important to cultivate excellent algae during the hepatopancreas-transferring period. The most important thing is to stabilize the water, prevent algae from algae, and inhibit the growth of harmful algae. If harmful algae such as dinoflagellates predominate in the pond, it will produce large amount of algae toxins, which can cause irreversible damage to the hepatopancreas and nerve system of vannamei. So we should cultivate excellent algae in ponds, and if there are more excellent algae, bad algae will not accumulate. Chlorella and diatoms are the best examples of excellent algae, and chlorella is the most common and effective product in the algae cultivation process.
The feed contains a lot of fat and protein, and the daily feeding amount is very large, which inadvertently increases the burden on the hepatopancreas, so we can mixin the vannamei feed during normal feeding. The main role ofis to protect the hepatopancreas of vannamei and to promote the development of hepatopancreas. The use ofduring hepatopancreas-transferring period can promote the regeneration of hepatopancreas cells and hepatic lobules, promote hepatopancreas development, enhance hepatopancreas function, and promote hepatopancreas detoxification socan help vannamei to successfully pass the hepatopancreas-transferring period. In addition,can also improve anti-stress ability to get higher survival rate, reduce the incidence rate, and ensure the health of the vannamei.