野生与养殖铜鱼营养及风味品质分析

Evaluation of nutritional and flavor quality of wild and cultured Coreius heterodon(Bleeker)

  • 摘要: 【目的】 探究野生与养殖铜鱼的营养和风味差异,为铜鱼养殖群体的营养学研究提供基本参数,并为铜鱼全营养配合饲料的开发和优化提供参考依据。【方法】 以野生与养殖铜鱼为研究对象,采用生化分析方法比较分析其肌肉中常规营养成分、氨基酸组成和含量、脂肪酸组成和含量及挥发性风味物质的差异。【结果】 养殖铜鱼肌肉中粗蛋白和粗脂肪含量分别显著(P<0.05,下同)和极显著(P<0.01,下同)高于野生铜鱼,分别提高6.17%和19.73%;养殖铜鱼肌肉中氨基酸总量(∑TAA)显著高于野生铜鱼,提高2.96%,除蛋氨酸和组氨酸外,其余7种必需氨基酸含量均极显著高于野生铜鱼,必需氨基酸总量(∑EAA)较野生铜鱼提高4.04%;野生与养殖铜鱼的第一限制性氨基酸均为蛋氨酸+胱氨酸,养殖铜鱼必需氨基酸指数(EAAI)为72.92,略低于野生铜鱼(76.55);养殖铜鱼肌肉中脂肪酸总量(∑FA)、不饱和脂肪酸总量(∑UFA)、n-6多不饱和脂肪酸总量(∑n-6 PUFA)、多不饱和脂肪酸总量与饱和脂肪酸总量比值(∑PUFA/∑SFA)均极显著高于野生铜鱼,而n-3多不饱和脂肪酸总量(∑n-3 PUFA)、二十碳五烯酸(EPA)和二十二碳六烯酸(DHA)含量、∑n-3 PUFA/∑n-6 PUFA均极显著低于野生铜鱼;野生与养殖铜鱼肌肉中共检测出40种挥发性风味物质,醛类占比最高,以(E,E)-2,4-癸二烯醛对样品总体风味贡献最大,野生铜鱼肌肉中呈鱼腥味的正己醛、庚醛和1-辛烯-3-醇相对含量均极显著高于养殖铜鱼,表明养殖铜鱼具有较好的风味。【结论】 养殖铜鱼肌肉中氨基酸和脂肪酸含量较高,氨基酸比例均衡,且整体鱼腥味较淡;野生铜鱼则在EPA、DHA及n-3 PUFA含量和脂肪酸比例方面更具优势。在养殖过程中,可进一步优化铜鱼人工配合饲料营养配比,提高养殖技术和水体质量,缩小野生与养殖铜鱼营养品质差异,使养殖铜鱼成为一种极具推广潜力的优良品种。

     

    Abstract: 【Objective】 To explore the nutritional and flavor differences between wild and cultured Coreius heterodon(Bleeker), provide basic parameters for the nutritional research of Coreius heterodon(Bleeker) aquaculture populations, which could provide reference basis for the development and optimization of full nutritional fomulated feed of Coreius heterodon(Bleeker). 【Method】 This study took wild and cultured Coreius heterodon(Bleeker) as research objects and used biochemical analysis methods to compare and analyze the differences in the conventional nutrients, amino acid composition and content, fatty acid composition and content, and volatile flavor substances in their flesh. 【Result】 The crude protein and the crude lipid content of the cultured Coreius heterodon(Bleeker) flesh was significantly(P<0.05, the same below) and extremely(P<0.01, the same below) higher than those of the wild Coreius heterodon(Bleeker), which were 6.17% and 19.73% higher than those of wild Coreius heterodon(Bleeker) respectively. The total amino acid content (∑TAA) in the flesh of the cultured Coreius heterodon(Bleeker) was significantly higher than that of the wild Coreius heterodon(Bleeker), which were 2.96% higher than that of wild Coreius heterodon(Bleeker). Except methionine and histidine, the contents of the rest 7 species of essential amino acid were all extremely significantly higher than those of the wild Coreius heterodon(Bleeker), and the total amount of essential amino acids (∑EAA) was 4.04% higher than that of wild Coreius heterodon(Bleeker); the first limiting amino acid of both wild and cultured Coreius heterodon(Bleeker) was methionine+cysteine(Met+Cys), the essential amino acid index(EAAI) of cultured Coreius heterodon(Bleeker) was 72.92, slightly lower than that of wild Coreius heterodon(Bleeker)(76.55); the total fatty acid content (∑FA), total unsaturated fatty acid content (∑UFA), n-6 unsaturated fatty acid content (∑n-6 PUFA), and the ratio of total polyunsaturated fatty acids to total saturated fatty acids (∑PUFA/∑SFA) of the cultured Coreius heterodon(Bleeker) flesh were all significantly higher than those of the wild Coreius heterodon(Bleeker), while the content of n-3 unsaturated fatty acid content (∑n-3 PUFA), eicosapentaenoic acid(EPA) and docosahexaenoic acid(DHA)contents, ∑n-3 PUFA/∑n-6 PUFA were all extremely significantly lower than those of the wild Coreius heterodon(Bleeker). A total of 40 volatile flavor substances were detected in the flesh of wild and cultured Coreius heterodon(Bleeker), with aldehydes accounting for the highest proportion; in both groups of Coreius heterodon(Bleeker) flesh,(E, E)-2, 4-decadienal contributed the most to the overall flavor of the samples. The relative contents of n-hexanal, heptanal and 1-octen-3-ol with fishy smell in wild Coreius heterodon(Bleeker) flesh were extremely significantly higher than those of cultured Coreius heterodon(Bleeker), indicating that cultured Coreius heterodon(Bleeker) had a better flavor. 【Conclusion】 The cultured Coreius heterodon(Bleeker) flesh has higher amino acid and fatty acid content and balanced amino acid ratio, and the overall fishy smell is weak, while the wild Coreius heterodon(Bleeker) has more advantages in EPA, DHA and n-3 PUFA content and fatty acid ratio. During the breeding process, the nutritional ratio of artificial compound feed of Coreius heterodon(Bleeker) can be further optimized, the breeding technology and water quality can be improved, the nutritional quality differences between wild and cultured Coreius heterodon(Bleeker) can be narrowed, and the farmed Coreius heterodon(Bleeker) can be made an excellent variety with great promotion potential.

     

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