The fresh water center of the Chinese Academy of Fishery Sciences has made new progress in the study of artificial breeding and feeding domestication of freshwater Sciaenops
By: Date: 2022-07-14 Categories: foodtechnology Tags: ,
Recently, the innovation team of the Chinese Academy of Fishery Sciences and the”innovation team of aquatic animal breeding with Yangtze River characteristics” of the Freshwater Fisheries Research Center have made new progress in the research of fully artificial breeding and feeding domestication of freshwater Sciaenops.
 
In recent years, with the continuous improvement of people’s living standards, high-quality protein sources have become an extremely important part of the dietary structure. Among them, aquatic products with low fat content but rich in unsaturated fatty acids are an important source of high-quality protein. However, in the current aquaculture structure, 90%of the aquaculture production comes from only 27 major aquaculture varieties; In view of this, domesticating new species of aquatic animals with good biological characteristics, high nutritional value and great social and economic value is of great significance to the sustainable development of aquaculture.
 
Freshwater Sciaenidae, also known as freshwater Pseudosciaena crocea, native to North America, is the only species of Sciaenidae that lives in fresh water all its life. Freshwater Sciaenops has the advantages of delicious meat, high nutritional value (high content of protein, amino acids and unsaturated fatty acids), high edible rate, no intramuscular spines, suitable for processing and so on. It is a high-quality aquatic animal protein source. In 2016, the freshwater center introduced the original species of freshwater stonehead from the United States, led by researcher Xu Pao, to carry out scientific research. In 2019, it broke through the artificial breeding technology for the first time in the world. In 2022, with the continuous recurrence of the COVID-19, researchers Xu Pao and Wen Haibo led the team to overcome many difficulties, and through the domestication and cultivation of F1 parents, they obtained F2 generation freshwater Sciaenops sinensis seedlings, which realized the full-scale artificial breeding of seedlings, and laid a solid foundation for the large-scale breeding and industrialized development of freshwater Sciaenops sinensis seedlings in China.
 
Domestication of the feeding habits of wild species has always been a major problem that puzzles the animal community. Freshwater Sciaenops is a carnivorous fish, which mainly feeds on benthos and fish in nature. Therefore, the ingestion and domestication of artificial formula feed is a major problem restricting the artificial cultivation of freshwater Sciaenops. After scientific research, the research group designed a pond domestication model to conduct a 4-month artificial compound feed domestication experiment on the freshwater Sciaenops sinensis seedlings 21 days after incubation. The results showed that the final weight of the fish in the diet group (DOM) was 21.66 times that of the non diet group (WT); And DOM fish’s digestive ability to sugar, fat and protein was significantly enhanced, and their appetite and perception were significantly enhanced. Transcriptome analysis showed that DOM significantly improved the digestion and absorption of fish protein, inhibited cell apoptosis through AGE-RAGE signal, and activated extracellular matrix remodeling through relaxin signal; Intestinal microbiological analysis showed that the abundance of Pseudomonas in DOM group increased significantly, becoming the dominant flora. Through the joint analysis of transcriptome and intestinal microorganisms, the researchers further confirmed that Pseudomonas and its regulated feeding perception, protein utilization and the interaction of intracellular homeostasis are the potential regulatory mechanisms of feeding domestication. The results showed that Pseudomonas and its regulated feeding related genes were potential targets to change the feeding of freshwater Sciaenops, which provided an important theoretical basis for feeding domestication. On this basis, the research group also screened the feeding attractants that can effectively regulate Pseudomonas, and conducted scientific and effective feeding domestication and feeding habits transformation research.
 
Related research paper”gut microbes reveal pseudomoNAS medicates ingestion preference via protein utilization and cellular homestasis under feed housekeeping in fresh water drum, applodinotus grunniens”was published in the authoritative journal in the field of Microbiology froNtiers in Microbiology (impact factor 6.064, JCR zone I). Dr. songchangyou of the gene center of biotechnology research laboratory is the first author, and associate researcher Li Hongxia and researcher Xu Pao are the corresponding authors. Full text link:https://doi.org/10.3389/fmicb.2022.861705