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Enhanced Growth Performance Physiological and Biochemical Indexes of Trachinotus ovatus Fed With Marine Microalgae Aurantiochytrium sp. Rich in n-3 Polyunsaturated Fatty Acids

文献类型： 外文期刊

作者： Li, Shuangfei 1 ; Wang, Boyu 1 ; Liu, Liangxu 1 ; Song, Yingjie 1 ; Lv, Chuhan 1 ; Zhu, Xingyu 1 ; Luo, Yanqing 1 ; Cheng 1 ;

作者机构： 1.Shenzhen Univ, Coll Life Sci & Oceanog, Guangdong Technol Res Ctr Marine Algal Bioengn, Guangdong Key Lab Plant Epigenet, Shenzhen, Peoples R China

2.Shenzhen Univ, Coll Life Sci & Oceanog, Shenzhen Key Lab Microbial Genet Engn, Shenzhen Key Lab Marine Biol Resources & Ecol Env, Shenzhen, Peoples R China

3.Shenzhen Univ, Longhua Innovat Inst Biotechnol, Shenzhen, Peoples R China

4.Chinese Univ Hong Kong, Sch Biomed Sci, Hong Kong, Peoples R China

5.Guangdong Ocean Univ, Fisheries Coll, Guangdong Res Ctr Reprod Control & Breeding Techn, Zhanjiang, Peoples R China

6.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Shenzhen Base, Shenzhen, Peoples R China

关键词： n-3 polyunsaturated fatty acids; docosahexaenoic acid; polyunsaturated fatty acids; Aurantiochytrium sp; Trachinotus ovatus

期刊名称：FRONTIERS IN MARINE SCIENCE （ 影响因子：4.912； 五年影响因子：5.125 ）

ISSN：

年卷期： 2021 年 7 卷

页码：

收录情况： SCI

摘要： Aurantiochytrium sp. is a major source of n-3 polyunsaturated fatty acids (n-3 PUFAs), which are essential nutrients for marine fish. n-3 PUFAs have drawn increasing attention because of their great potential for improving the biological functions of fish. The growth performance and immune response of Trachinotus ovatus were studied by applying diets with various microalgae content from 1.00 to 11.00% for 8 weeks. The results showed that, with the addition of Aurantiochytrium sp., the survival rate, weight gain rate, and specific growth rate of fish increased by a maximum of 1.02, 1.16, and 1.08 times, respectively, indicating that the intake of marine microalgae Aurantiochytrium sp. was beneficial for fish growth. As the microalgae content increased, the feed utilization efficiency index feed conversion ratio decreased (maximum 15.00%) and feed efficiency increased (maximum 1.17 times), showing that the addition of Aurantiochytrium sp. contributed to the assimilation of fish feed. Furthermore, our results showed that as the addition of Aurantiochytrium sp. increased (from 1.00 to 11.00%), the glucose content increased in the blood (from 9.04 to 27.80%). The content of fatty acids ARA, ALA, DHA, and EPA in fish was significantly increased after adding Aurantiochytrium sp. in diets. In liver, ARA content increased from 1.17 to 1.63%, ALA increased from 0.56 to 0.85%, DHA increased from 14.44 to 20.61%, and EPA increased from 1.86 to 4.40%. In muscle, ARA content increased from 0.97 to 1.24%, ALA increased from 0.59 to 0.81%, DHA increased from 14.63 to 14.82%, and EPA increased from 4.58 to 5.19%. Positive changes were observed in the blood cell count of immune related cells (white blood cells, lymphocytes, monocytes, neutrophils, and red blood cells). These results indicated that microalgae rich in n-3 PUFAs could increase the number of immune cells, thus helping to improve fish immunity and disease resistance.

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