Feed additive for preventing early death of litopenaeus vannamei, and preparation method and application of feed additive

Abstract

The invention relates to a feed additive for preventing early death of litopenaeus vannamei, and a preparation method and application of the feed additive. The feed additive comprises the following major ingredients of microencapsulated haematococcus pluvialis powder, organic acid and esters. Slow release and protection of the organic acid and algae source astaxanthin are achieved through two kinds of coating liquid with different functions; and a double-layer coating process is used, so that the relative independence of the additive is improved, and the reaction with feed ingredients in the application process is effectively avoided. After 0.5 to 1 mass percent of additive is added into the feed for the litopenaeus vannamei, the body immunity of the litopenaeus vannamei can be effectivelyenhanced; the propagation of vibrio parahaemolyticus is effectively controlled, the intestinal flora balance is improved, and meanwhile, the disease resistance of the litopenaeus vannamei is enhanced; further, the outbreak of early death syndrome of the litopenaeus vannamei is prevented; healthy growth of the litopenaeus vannamei is promoted; and no adverse effect is caused on the palatability ofthe feed. The feed additive has the advantages of no pollution, no residue and no side effect, achieves safety and environment-friendly effects, and can be widely applied to the technical field of feed additives.

Description

technical field [0001] The invention relates to the technical field of feed additives, in particular to a feed additive for preventing early death of prawns, a preparation method and application thereof. Background technique [0002] Vannamei (Litopenaeus vannamei) is the main shrimp species cultured in many Asian countries. Since 2010, shrimp farmers have suffered significant economic losses due to Early Mortality Syndrome (EMS), where affected shrimp show signs of paleness due to pigment loss, discoloration, and hepatopancreatic atrophy, and these signs can occur as early as 4 years after stocking. Days become apparent. V. parahaemolyticus was the suspected pathogen responsible for mass mortality, as it caused 100% mortality of experimental prawns with typical EMS pathology. [0003] my country officially announced that starting from July 2020, the use of antibiotics in commercial feeds will be completely prohibited. In shrimp farming, it is necessary to find an alternat...

AI Technical Summary

Problems solved by technology

[0004] There are usually two ways to add organic acid and astaxanthin in the feed, one is the direct mixing and adding of finished feed, and the other is directly adding during the feed making process. Organic acids usually exist in the application process of prawn feed The following two problems: ①Because the feeding method of prawns is hugging and eating, the feed lasts for a long time in the water body, organic acids are mostly soluble in water, and long-term soaking will cause a large amount of active ingredients to be missing. React with the corresponding mineral components and alkaline components in the feed, affecting the efficacy of the feed

During the application of astaxanthin in prawn feed, there are usually the following problems: ①It is easy to oxidize in the air, and the loss rate is high under high temperature conditions

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