Feed additive for preventing early death of prawns and its preparation method and application

Abstract

The invention relates to a feed additive for preventing early death of prawns and its preparation method and application. The main components of the additive include microencapsulated Haematococcus pluvialis algae powder, organic acids and esters. The slow release and protection of organic acids and algal astaxanthin are achieved through two coating solutions with different functions; the use of double-layer coating technology improves the relative independence of the additive and effectively avoids the interaction with feed ingredients in the application process. reaction. Adding 0.5% to 1% of the additive in the feed of Penaeus vannamei can effectively enhance the immunity of the body of Penaeus vannamei, effectively control the reproduction of Vibrio parahaemolyticus, improve the balance of intestinal flora, and enhance the disease resistance of the shrimp. , thereby preventing the outbreak of the early mortality syndrome of Penaeus vannamei, promoting the healthy growth of the shrimp, and having no adverse effects on the palatability of the feed. The additive has no pollution, no residue, no side effects, is safe and environment-friendly, and can be widely used in 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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