Effects of salinity and alkalinity on fatty acids, free amino acids and related substance anabolic metabolism of Nile tilapia

Aquaculture and Fisheries

Christian Larbi Ayisi¹  Jinliang Zhao²  Xiaoying Cao³  Yamei Cheng³ 

[1] Center for Research on Environmental Ecology and Fish Nutrition of the Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai, 201306, China;Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, Shanghai Ocean University, Shanghai, 201306, China;Key Laboratory of Freshwater Fishery Germplasm Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai, 201306, China;

关键词: Nile tilapia;    Nutritional value;    Flavor;    Metabolism;    Salinity;    Alkalinity;   

DOI  :  

来源: DOAJ

【 摘 要 】

A 56-day experiment was conducted to investigate the effects of ambient salinity and alkalinity on fatty acids, free amino acids and related anabolic metabolisms of Nile tilapia. The fatty acid and free amino acid contents in the muscle of tilapia cultured in saline water (SW), alkaline water (AW), saline–alkaline water (SAW) and fresh water (FW) conditions were analyzed and compared. The mRNA levels and enzymatic activities of fatty acyl desaturase (FADS2), elongation of very long-chain fatty acids (ELOVL5), Δ1-pyrroline-5-carboxylate synthase (P5CS), ornithine-δ-aminotransferase (δ-OAT), and proline dehydrogenase (PDH) were also determined. The contents of saturated and monounsaturated fatty acids were significantly higher in the AW and SAW groups than those in the SW group, and those of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were the highest in the SAW group. The contents of flavor amino acids in the SAW and AW groups were significantly higher than that in the SW group, and that of proline in the SW, AW, and SAW groups was 3.58-, 4.11-, and 4.15-times higher than that in the FW group. The mRNA levels and enzyme activities of FADS 2, ELOVL5, PDH and P5CS were found to differ among the different groups. The results suggested that ambient salinity and alkalinity could effectively improve flesh quality of tilapia by regulating lipid and proline metabolism pathways.

【 授权许可】

Unknown