Xu Yongjian, Yang Bo, Jinyang Xie, Lou Yejing
Key Laboratory of Aquacultural Biotechnology of MOE, School of Marine Sciences, Ningbo University, Meishan Campus, No.169 Qixing South Road, Meishan Island, Ningbo City, Zhejiang Province, 315832, People's Republic of China.
Fish Physiol Biochem. 2025 May 31;51(3):106. doi: 10.1007/s10695-025-01514-x.
Feed is very important for fish farming. The appropriate composition and proportion of feed ingredients can promote the growth of fish, maintain normal physiology and behavior, and even improve the resistance ability to disease and stress, etc. The core of artificial compound feed (ACF) is the composition and proportion of lipid, protein, and carbohydrate, which are also the main nutritional components required by fish. Appropriate levels and ratios can promote fish growth and save costs, and the improper would affect the biological clock systems of fish, leading to metabolic abnormalities. This study explored the preparation of ACF for H. kuda. The composition and proportion of the three main nutrients in ACF were screened based on the synchronicity between six pairs of clock genes (Clock, Bmal1, Per1, Per2, Per3, Cry1, and Cry2) in the central and peripheral clock systems, as well as the expression of eight lipid-metabolism genes (Hmgcr, Mvk, Mvd, Lss, Fdps, Cetp, Scap, Srebp1, Srebp2) in the liver and their synergy with liver clock genes. The results showed that, based on several parameters such as gene expression cycle, relative expression level, and top phase appearance time, the best synergy between the central and peripheral circadian clock systems was observed in ACF with crude fat content of 8.80%, crude protein content more than 38.4%, and carbohydrate content of 23.5%. Based on the expression relationship between lipid metabolism genes and circadian clock genes in the liver, it was further clarified that the optimal levels of fat, protein, and carbohydrate were determined with 8.80%, 38.4%, and 23.5%, respectively. After 4 weeks of breeding validation, compared with frozen Mysis, the screened ACF fed for H. kuda showed significant advantages in body length specific growth rate (SGR), body weight specific growth rate (SGR), and feed conversion rate (FCR).
饲料对于养鱼业非常重要。饲料成分的适当组成和比例可以促进鱼类生长,维持正常的生理和行为,甚至提高对疾病和应激等的抵抗能力。人工配合饲料(ACF)的核心是脂质、蛋白质和碳水化合物的组成和比例,它们也是鱼类所需的主要营养成分。适当的水平和比例可以促进鱼类生长并节省成本,而不适当的水平和比例会影响鱼类的生物钟系统,导致代谢异常。本研究探索了用于黑背鼻鱼的ACF的制备。基于中枢和外周生物钟系统中六对时钟基因(Clock、Bmal1、Per1、Per2、Per3、Cry1和Cry2)之间的同步性,以及肝脏中八个脂质代谢基因(Hmgcr、Mvk、Mvd、Lss、Fdps、Cetp、Scap、Srebp1、Srebp2)的表达及其与肝脏时钟基因的协同作用,筛选了ACF中三种主要营养素的组成和比例。结果表明,基于基因表达周期、相对表达水平和峰值出现时间等多个参数,在粗脂肪含量为8.80%、粗蛋白含量超过38.4%、碳水化合物含量为23.5%的ACF中观察到中枢和外周昼夜节律生物钟系统之间的最佳协同作用。基于肝脏中脂质代谢基因与昼夜节律生物钟基因之间的表达关系,进一步明确了脂肪、蛋白质和碳水化合物的最佳水平分别为8.80%、38.4%和23.5%。经过4周的养殖验证,与冷冻糠虾相比,筛选出的用于黑背鼻鱼的ACF在体长特定生长率(SGR)、体重特定生长率(SGR)和饲料转化率(FCR)方面显示出显著优势。