California bass, as a prominent hot species in aquaculture, has been widely sought after by the market in recent years. At the same time, various diseases represented by "hepatobiliary syndrome" have become more and more serious, which has become a major bottleneck restricting the development of California bass industry. How to do a good job of liver and gallbladder health care of California bass is the key factor to raise this fish well.

Problems such as "flower liver" and "white liver" are concentrated, which is what we feel most deeply in field research. Many California bass feeds are high in protein, sugar and fat, but the digestibility of nutrients is relatively low, which requires farmers to pay attention to protecting liver and gallbladder in their daily feeding. The appearance of Youdanling is aimed at this pain point, and it has finally been recognized by farmers through a lot of practice. < Youdanling > has the effects of protecting liver and gallbladder, detoxicating and reducing fat, so it is usually mixed with materials in practical application, and its rich bile acid has the following two functions:

0 1 emulsifying, activating and promoting absorption bile acids are amphipathic, which can emulsify feed fat into the water environment of intestine, thus contributing to the digestion of fat; Bile acid can also activate pancreatic lipase, which makes lipase have higher enzyme activity in the anterior segment of small intestine with pH6-7. Bile acids that form chylomicrons with fatty acids, phospholipids and other fat-soluble substances can be recognized by the receptors of intestinal epithelial cells, thus promoting the absorption of lipid nutrients.

Bile acid, as a signal molecule, regulates the metabolism of fat and sugar by binding with farnesol X receptor (FXR) and G protein-coupled receptor (TGR5).

Hepatobiliary syndrome

However, it is not enough to protect the liver and gallbladder for California bass culture. How to better protect the health of the body from the source, enhance immunity and increase the survival rate is the key to culture. As a natural astaxanthin product, < Youqingsu > has played an inestimable role in improving the health status of California bass and enhancing its nutritional value, which is also an important reason why such products have been widely used in aquaculture in recent years:

0 1 strong antioxidant astaxanthin is a powerful antioxidant, which can effectively scavenge free radicals (free radicals are an important factor causing physical decline and immune decline) and play an antioxidant role. Astaxanthin prevents the oxidation reaction by preventing the interaction between oxygen atoms and unsaturated fatty acids in the cell membrane, thus protecting cells and DNA from the damage of oxidation reaction, protecting intracellular protein, and enabling cells to metabolize efficiently.

Enhancing immunity Natural astaxanthin can promote the production of immunoglobulin in the body, enhance the immune function of the body, improve the microecological balance in the body, prevent the invasion of viruses and bacteria, and improve the vitality and growth rate of the body; After full absorption, it can help to fight against various diseases caused by sudden environmental changes such as temperature difference, algae bloom, high temperature and heavy rain, and its anti-stress ability is greatly strengthened.

Improving the nutritional value Astaxanthin can also improve the nutritional value of California perch. Long-term feeding with feed containing astaxanthin can significantly increase the contents of vitamins A, C, E and lipids in body tissues.

Liver after using Youdanling and Youqingsu

After using Youdanling and Youqingsu, the problems such as "flower liver" and "white liver" of California perch have been significantly improved, and the liver color is ruddy (returning to the common pig liver color), the blood vessels are clear, and there is basically no swelling, whitening, yellowing and bleeding, and farmers are satisfied with this.

The liver of California perch has detoxification and immune function. Once the liver is damaged, the immunity of fish decreases, which will easily lead to various diseases. If the health care work is done well, the disease resistance of California bass is naturally strong. In view of hepatobiliary syndrome, prevention should be given priority to, scientific feeding should be done on the premise of maintaining good water quality, and < Youdanling > and < Youqingsu > should be added to the feed, so as to finally improve the breeding efficiency.