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<p>We analyzed body size: total body length (TL), total body weight (BW), condition factor (CF), and gonad somatic index (GSI) and chemical components: proximate composition, fatty acid, tocopherol, nucleotide, free amino acid, and imidazole dipeptide contents of <i>Trichiurus</i> sp. 2 and <i>T. japonicus</i>, which are species of hairtails (family Trichiuridae), for between May 2022 and March 2024 on the Miyazaki coast in Japan. Correlation coefficient and principal component analysis (PCA) was performed using 65 parameters to determine the correlation between the chemical composition of the samples. As a result, the GSI period for the two species were considered to be from June to August. The GSI of <i>Trichiurus</i> sp. 2 and <i>T. japonicus</i> were 3.71 ± 1.12 and 3.80 ± 3.57 on Jun 2023, respectively. The in-season for the two species of hairtails in terms of lipid content are from winter to early spring. The lipid composition of <i>Trichiurus</i> sp. 2 and <i>T. japonicus</i> were 11.14 ± 5.28% and 6.06 ± 2.16% on March 2024, respectively. Similarly, the in-season for the <i>Trichiurus</i> sp. 2 in terms of amino acids, which are directly related to taste, content are from winter to early spring. However, for <i>T. japonicus</i>, the in-season was not clearly defined. PCA analysis indicated that <i>Trichiurus</i> sp. 2 exhibited higher lipid and taurine content compared to <i>T. japonicus</i> throughout the year. Therefore, based on fatty taste and nutritional value, <i>Trichiurus</i> sp. 2 may be superior to <i>T. japonicus</i>.</p>

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Seasonal changes in the body size and nutritional components of Trichiurus sp. 2 and Trichiurus japonicus from the Miyazaki coast in Japan

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  • 发表日期：

    2025年10月6日

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  • Takumi Imagawa,
  • Ryohei Horie,
  • Misa Matsumoto,
  • Keito Tachibanagi,
  • Ryusuke Tanaka

摘要

We analyzed body size: total body length (TL), total body weight (BW), condition factor (CF), and gonad somatic index (GSI) and chemical components: proximate composition, fatty acid, tocopherol, nucleotide, free amino acid, and imidazole dipeptide contents of Trichiurus sp. 2 and T. japonicus, which are species of hairtails (family Trichiuridae), for between May 2022 and March 2024 on the Miyazaki coast in Japan. Correlation coefficient and principal component analysis (PCA) was performed using 65 parameters to determine the correlation between the chemical composition of the samples. As a result, the GSI period for the two species were considered to be from June to August. The GSI of Trichiurus sp. 2 and T. japonicus were 3.71 ± 1.12 and 3.80 ± 3.57 on Jun 2023, respectively. The in-season for the two species of hairtails in terms of lipid content are from winter to early spring. The lipid composition of Trichiurus sp. 2 and T. japonicus were 11.14 ± 5.28% and 6.06 ± 2.16% on March 2024, respectively. Similarly, the in-season for the Trichiurus sp. 2 in terms of amino acids, which are directly related to taste, content are from winter to early spring. However, for T. japonicus, the in-season was not clearly defined. PCA analysis indicated that Trichiurus sp. 2 exhibited higher lipid and taurine content compared to T. japonicus throughout the year. Therefore, based on fatty taste and nutritional value, Trichiurus sp. 2 may be superior to T. japonicus.