Application of yeast hydrolysate in aquaculture

The application of yeast hydrolysate in aquaculture mainly includes the following aspects:

As a high-quality protein source

Partial replacement of fish meal: Fish meal is a high-quality source of protein in aquatic feed, but its resources are limited and its price is relatively high. Yeast hydrolysate has a high protein content and is rich in various essential amino acids, with a balanced amino acid composition. It can replace fish meal to a certain extent and reduce feed costs. For example, there have been successful cases of substitution in the feed of aquatic animals such as vannamei and hybrid snakehead.

Improving the nutritional value of feed: In addition to protein, yeast hydrolysate also contains rich nutrients such as vitamins, minerals, nucleic acids, etc., which can supplement various nutrients needed for the growth of aquatic animals, making the nutrition of feed more comprehensive.

Promote the growth of aquatic animals

Improving digestive enzyme activity: Small peptides, amino acids, and other components in yeast hydrolysates can stimulate the secretion of digestive enzymes in aquatic animals, such as proteases, amylases, lipases, etc., thereby improving the digestibility and utilization of feed and promoting the growth of aquatic animals. For example, in shrimp farming, the use of yeast hydrolysate can increase the amino acid content in shrimp bodies, enhance their digestion and absorption capacity, accelerate the conversion and absorption of food in the intestine, and thus improve the growth rate of shrimp.

Provide growth factors: Contains various bioactive substances such as nucleotides, growth factors, etc., which can directly participate in the metabolism of aquatic animals, promote cell division and growth, accelerate protein synthesis, and thus improve the growth performance of aquatic animals.

Enhance the immunity of aquatic animals

Activation of immune cells: Polysaccharides such as β - glucan and mannan in yeast hydrolysate can activate immune cells such as macrophages and lymphocytes in aquatic animals, enhance their non-specific immune function, and improve their resistance to pathogens. For example, feeding Chinese mitten crabs with yeast polysaccharides can enhance their disease resistance; Adding a certain amount of yeast culture to the feed of Penaeus vannamei can improve its non-specific immune indicators.

Regulating gut microbiota: Yeast hydrolysates help maintain the balance of gut microbiota in aquatic animals, promote the growth of beneficial bacteria, inhibit the proliferation of harmful bacteria, thereby reducing the occurrence of intestinal diseases and indirectly improving the immune system of aquatic animals. For example, adding Marine Red Yeast I to the bait can increase the survival rate of shrimp larvae and enhance their tolerance to environmental factors.

Improving the quality of aquatic animals

Improving muscle nutrition: The nutrients in yeast hydrolysate can promote the growth and development of aquatic animals, increase the protein content and make the fat content more reasonable in muscles. At the same time, it can also increase the content of essential amino acids, unsaturated fatty acids and other nutrients in muscles, improving the meat quality of aquatic animals.

Increasing body color and ornamental value: Some yeast hydrolysate products contain pigments such as astaxanthin, which can be directly absorbed, stored, and deposited in tissues by animals after feeding, thereby increasing the body color of farmed animals and enhancing their ornamental value. For example, adding Fafu yeast rich in astaxanthin to the bait and feeding it to Chinese goldfish, astaxanthin is deposited in its body in an esterified form, and the pigment content in various parts of the fish body is increased.

As a water quality regulator

Reduce water pollutants: Some components in yeast hydrolysate can decompose organic waste and sediment in water, reduce the accumulation of harmful substances such as ammonia nitrogen and nitrite in water, thereby improving water quality and providing a good living environment for aquatic animals. For example, some yeast metabolites can be used as water quality improvers to degrade harmful substances in water, such as ammonia nitrogen and nitrite, and maintain the ecological balance of the water body.

Stable aquatic ecosystem: By promoting the growth and reproduction of beneficial microorganisms in the water, yeast hydrolysates can regulate the microbial community structure of the water, making the aquatic ecosystem more stable and reducing aquatic animal diseases caused by water quality deterioration.