Nonspecific immunity strengthening agent for shrimps and crabs, and preparation method thereof

Abstract

The invention relates to a nonspecific immunity enhancer for shrimps and crabs and a preparation method thereof, and belongs to the technical field of feed additive in the aquiculture industry. The immunity enhancer comprises the following components in weight percentage: 27 to 29 percent of radix isatidis, 15 to 17 percent of heroubill geranium, 7 to 9 percent of scutellaria, 7 to 9 percent of milk veteh, 7 to 9 percent of cordate houttuynia, 7 to 9 percent of dried orange peel, 3.5 to 4.5 percent of forsythia and the balance being yeast powder. The components are crushed to 100 meshes and added to basic bait according to a proportion of 1 to 2 percent, so as to improve nonspecific immunity of the shrimps and crabs remarkably, enhance phagocytosing function of blood cells of the shrimps and crabs, and effectively remove free radicals in vivo of the shrimps and crabs. Through activating self Pro proenzyme systems of the shrimps and crabs, the enhancer improves Pro enzyme activity remarkably and prevents cultivation diseases.

Description

technical field [0001] The invention belongs to the technical field of aquaculture feed additive and its preparation, and relates to a shrimp and crab non-specific immune enhancer and a preparation method thereof. Background technique [0002] Shrimp and crab aquaculture is the pillar industry of my country's aquaculture industry. However, with the rapid development of aquaculture scale, diseases are becoming more and more serious, especially the rapid increase of bacterial and viral diseases, which seriously affects the economic benefits of shrimp and crab aquaculture. Since a large-scale outbreak occurred in 1993 because of shrimp white spot syndrome virus (WSSV), the shrimp farming industry suffered a devastating blow. So far, more than 20 kinds of viruses have been found to infect shrimp, but there is no effective way to deal with these viruses. The use of antibiotics has alleviated the occurrence of diseases to a certain extent, but because antibiotics are easy to rema...

AI Technical Summary

Problems solved by technology

However, it is unrealistic to fully disinfect the entire water body during the onset of breeding; in the breeding stage of crab species, reducing the occurrence of diseases by reducing the stocking amount per unit of water body will increase the cost of breeding and increase the proportion of precocious crab species, significantly Reduce economic benefits; the prevention and treatment of cultured river crab diseases, such as using antibiotics for treatment, may be effective in the short term, but the negative effects are also obvious: (1) It is very easy to cause antibiotic residues in river crabs, which are passed through the food chain, and even directly threaten humans (2) easy to produce drug-resistant bacterial strains, so that low-dose disinfection reagents such as chlorine and formalin have no effect on pathogens at all; (3) affect the quality of river crabs, seriously affecting the export and domestic sales of river crabs

In fact, once river crabs get sick, it is completely impossible to treat all river crabs. In addition, river crabs do not have higher animal-specific immunity, and drug treatment is often difficult to achieve the desired effect.