研究揭秘虹鳟“抗高温”策略

Core Insights - The research conducted by the Qinghai University laboratory reveals the mechanisms by which rainbow trout adapt to chronic heat stress, which is critical for understanding the impacts of temperature changes on cold-water fish species [1][2] Group 1: Research Findings - Rainbow trout, a cold-water fish, show significant reductions in weight gain and feed intake under chronic heat stress, while feed conversion rates increase [1] - The study indicates that chronic heat stress leads to elevated expression of antioxidant-related genes in the liver, alongside increased oxidative stress and liver damage indicators, suggesting an activation of antioxidant defense mechanisms despite oxidative damage [1] - Structural remodeling occurs in the gill tissues of rainbow trout under chronic heat stress, with increased secondary gill lamella length and decreased inter-lamellar spacing and epithelial thickness [1] Group 2: Implications for Aquaculture - The adaptation mechanisms of rainbow trout to chronic heat stress, including accelerated liver glycogen breakdown and gut inflammation resistance, may lead to liver function impairment and decreased digestive capacity [2] - The findings provide a foundation for the development of high-temperature resistant feeds for cold-water fish species, which is essential for aquaculture sustainability [2]