Abstract: To explore the correlation between fatty acids and trophic level in freshwater fish, six fish species in different trophic levels were collected from Dongting Lake, and were dissected to muscle, liver, kidney, intestine, gill, eye, bladder, skin and lipid tissue. In this study, the stable nitrogen isotope abundance values(δ¹⁵N values)and fatty acid in fish tissues were determined with the stable isotope analysis and gas chromatography-mass spectrometry analysis(GC-MS), respectively. The results indicated that the saturated fatty acids and monounsaturated fatty acids have an even distribution in different fish tissues, while the polyunsaturated fatty acids has obvious differences distribution. It showed an increase with δ¹⁵N value that the ratio of docosahexaenoic acid to eicosapentaenoic acid in the muscle, gill, liver, skin and intestine of fish from Dongting Lake. It suggested that the ratios of DHA/EPA in these tissues could indicate the trophic level of fish from Dongting Lake.- DOI:10.3969/j.issn.1000-1565.2019.06.010洞庭湖鱼中脂肪酸的组织分布特征及其与δ¹⁵N值的相关性张可欣,郭睿,葛芳芳,安立会,赵兴茹(中国环境科学研究院 湖泊水污染治理与生态修复技术国家工程实验室,北京 100012)摘 要:为探究淡水鱼体内脂肪酸与营养级的相关性,采集了洞庭湖6种不同营养级的鱼,将其解剖为肌肉、肝脏、肾脏、肠、鳃、眼、鳔、皮和脂肪等组织样品,采用稳定同位素和气相色谱-质谱联用(GC-MS)分析技术测定不同营养级鱼组织中氮同位素丰度比值(δ¹⁵N值)和脂肪酸的含量. 结果表明,不同鱼组织中,饱和脂肪酸和单不饱和脂肪酸的分布较均匀,而多不饱和脂肪酸的分布却存在明显的差异. 在洞庭湖鱼类的肌肉、肝脏、鳃、皮和肠中二十二碳六烯酸与二十碳五烯酸的比值(DHA/EPA)随δ¹⁵N值的增加而增加,表明鱼组织中的DHA/EPA可以指示洞庭湖淡水鱼类营养级的高低.关键词:洞庭湖;鱼组织;脂肪酸;δ¹⁵N值中图分类号:O657.63 文献标志码:A 文章编号:1000-1565(2019)06-0629-08Distribution characteristic of fatty acid in fish tissues from Dongting Lake and its correlation with δ¹⁵N valueZHANG Kexin, GUO Rui, GE Fangfang, AN Lihui, ZHAO Xingru(National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China)Abstract: To explore the correlation between fatty acids and trophic level in freshwater fish, six fish species in different trophic levels were collected from Dongting Lake, and were dissected to muscle, liver, kidney, intestine, gill, eye, bladder, skin and lipid tissue. In this study, the stable nitrogen isotope abundance values(δ¹⁵N values)and fatty acid in fish tissues were determined with the stable isotope analysis and gas chromatography-mass spectrometry analysis(GC-MS), respectively. The results indicated that the saturated fatty acids and monounsaturated fatty acids have an even distribution in different fish tissues, while the polyunsaturated fatty acids has obvious differences distribution. It showed an increase with δ¹⁵N value that the ratio of docosahexaenoic acid to eicosapentaenoic acid in the muscle, gill, liver, skin and intestine of fish from Dongting Lake. It suggested that the ratios of DHA/EPA in these tissues could indicate the trophic level of fish from Dongting Lake.- 收稿日期:2019-06-10 基金项目:科技基础性工作专项(2015FY110900-6) 第一作者:张可欣(1994—),女,河北唐山人,河北师范大学硕士研究生,主要从事持久性有机污染物的迁移转化研究. E-mail:1468847709@qq.com 通信作者:赵兴茹(1965—),女,河北定州人,中国环境科学研究院研究员,主要从事持久性有机污染物的迁移转化方向的研究. E-mail: zhaoxr@craes.org.cn第6期张可欣等:洞庭湖鱼中脂肪酸的组织分布特征及其与δ¹⁵N值的相关性

Key words: Dongting Lake, fish tissue, fatty acid, δ¹⁵N value