Licorice Extract is a perennial herb of the genus Licorice in the legume family, derived from the dried roots and rhizomes of the leguminous plants licorice, licorice or licorice glabra. It is one of the homology species of medicine and food in China. Licorice flavor sweet flat, according to the theory of yin and yang five elements, licorice belongs to the soil, the soil is in the middle, so licorice can be "warm", because traditional Chinese medicine believes that all poison meets the soil that is, licorice is the "essence of the nine soils", so licorice can detoxify all poisons. Commentary on "Materia Medica": Licorice is the king of all medicines, cures 72 kinds of milky stone poisons, resolves 1,200 herbs and wood poisons, and has the merit of harmonizing all medicines.

The roots and stems of licorice contain triterpene saponin glycyrrhizic acid, that is, glycyrrhizin, which accounts for about 6% ~ 14% of licorice, which is ammonium, calcium or potassium salt of glycyrrhizic acid, which has no hemolytic effect, while glycyrrhetinic acid has. Licorice contains a variety of flavonoids, including glycyrrhizin, isoglycyrrhizin, glycyrrhizin, etc. In addition, licorice also contains a variety of trace elements necessary for aquatic animals, such as Zn, Ca, Sr, Ni, Mn, Mg, Fe, Cu, etc.

So, what are the functional uses of licorice in aquaculture? The author has used licorice decoction juice many times to degrade heavy metal poisoning in aquaculture water, and practice has proved that it has a certain detoxification function. To this end, the author consulted many aquaculture friends, and searched for books and literature related to aquatic animals, and summarized them into a document for your reference.

Licorice has the function of detoxification and protection of liver cells of aquatic animals. Licorice can effectively alleviate and degrade aquatic animal liver poisoning caused by feed mildew, excessive heavy metals, antibiotics, pesticide residues and other factors, and repair liver function. Adding licorice or licorice extract to the feed can improve the feed conversion rate and promote the growth of fish and shrimp.

Antiviral. Glycyrrhizic acid, glycyrrhetinic acid and licorice flavonoids have good antiviral activity in vitro and in vivo. It may have a certain adjuvant therapeutic effect on grass carp reovirus (hemorrhagic virus), grouper iridescence virus, spotted catfish virus, crucian carp hemorrhagic virus, shrimp white spot syndrome virus, etc.

Antibacterial and antibacterial. Ethyl glycyrrhizinate extract and glycyrrhetinic acid have inhibitory effects on Staphylococcus aureus, Streptococcus haemolyticus, Escherichia coli, etc. in vitro.