A number of new advances have been made in the study of environmental adaptability of largemouth bass

Largemouth bass is an important freshwater economic fish in China, because of its fewer spines and high quality of fish meat, it is deeply loved by consumers. With the success of artificial breeding and seed rearing, the production of largemouth bass has increased year by year, and the annual output has exceeded 600,000 tons in 2021. However, the cultivation process of largemouth bass is highly susceptible to the influence of fluctuating dissolved oxygen in water bodies, which will cause low-oxygen stress to have a huge impact on the industry when severe.

Recently, Professor Yang Song of the College of Animal Science and Technology of Sichuan Agricultural University published a research paper entitled “Metabolic Response of Largemouth Bass under Intermittent Hypoxia Conditions Provides New Ideas for Exploring Its Hypoxia Adaptation Mechanism”, which provides basic resources and new insights for understanding the adaptation of largemouth bass to low oxygen environment.

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Image source: College of Animal Science and Technology, Sichuan Agricultural University

The study used the intermittent hypoxia exposure (IHE) model to simulate the characteristics of dissolved oxygen instability and large fluctuations in the natural aquatic environment. The study found that IHE significantly enhanced the low oxygen tolerance of largemouth bass, and its critical dissolved oxygen value of imbalance decreased significantly compared with the control group. The results of whole transcriptome sequencing showed that the differentially expressed mRNA was mainly enriched in signaling pathways such as PPAR, fatty acid metabolism, and fatty acid degradation. Combined with the analysis of biochemical indexes, IHE promotes the process of gluconeogenesis, lactic acid metabolism and fatty acid oxidation in the liver of largemouth bass. The results show that IHE can improve the ability to tolerate hypoxia by regulating the ability of largemouth bass to remove anaerobic metabolic by-products and the selection of metabolic substrates, and the results also provide new insights to solve the important stress factor of largemouth bass in intensive aquaculture, low oxygen.

Zhao Liulan, associate professor of Sichuan Agricultural University, is the first author of the paper, Yan Haoxiao, a 2020 master’s student, is the co-first author, and Yang Song is the corresponding author. Sichuan Agricultural University is the only communication unit. In addition, the research team recently achieved new research results on the genome of largemouth bass and the promotion of angiogenesis of largemouth bass by hypoxic stress, and the results have been published in Scientific Data and Fish & Shellfish Immunology. The research has been funded by the National Natural Science Foundation of China and the Double Branch Program of Sichuan Agricultural University. (Source: China Science Daily Zhang Qingdan)

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