Non-destructive evaluation of the gonad weight and index of Japanese sea urchins using near-infrared spectroscopy

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  • Kimura Yuki
    Graduate School of Food, Agricultural and Environmental Sciences, Miyagi University Food Research Institute of Aomori Prefectural Industrial Technology Research Center
  • Kimiya Takashi
    Fisheries Technology Institute, Japan Fisheries Research and Education Agency Marine Fisheries Research and Development Center
  • Yoshida Shuhe
    Graduate School of Food, Agricultural and Environmental Sciences, Miyagi University
  • Ito Mizuki
    School of Food Industrial Sciences, Miyagi University
  • Hoshina Yuchie
    Graduate School of Food, Agricultural and Environmental Sciences, Miyagi University
  • Nishikawa Masazumi
    Graduate School of Food, Agricultural and Environmental Sciences, Miyagi University School of Food Industrial Sciences, Miyagi University

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  • 近赤外分光法を用いたキタムラサキウニ生殖巣重量および生殖巣指数の非破壊評価
  • キンセキガイ ブンコウホウ オ モチイタ キタムラサキウニ セイショク ソウ ジュウリョウ オヨビ セイショク ソウ シスウ ノ ヒハカイ ヒョウカ

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Abstract

<p>It is difficult to predict the gonad weight and index of edible sea urchins from just their appearance. In this research, we attempted to develop a non-destructive method for evaluating the gonad weight and index of Strongylocentrotus nudus using a transmission-type near-infrared spectrometer, which is widely used for non-destructive evaluation of the internal quality of fruits and vegetables. Two hundred sixteen S. nudus samples were collected in the Pacific Ocean near Ishinomaki City and Onagawa Town, Miyagi Prefecture, in 2021 and 2022. The obtained near-infrared absorption spectra were analyzed by principal component analysis. The first principal component explained 90 % of the second derivative-processed spectra. A negative peak was observed in the first loading vector around 930 nm, which is known as the lipid absorption band. The partial least squares regression model using second derivative-processed absorption spectra successfully predicted gonad weight with a factor number of 4, correlation coefficient of 0.78, and standard error of 4.4 g. Similarly, for the gonad index, a partial least squares regression model using 4 factors showed a correlation coefficient of 0.76 and a standard error of 4.6 g/100 g. These results suggest that near-infrared spectroscopy can evaluate the gonad weight and index without harming or damaging live specimens. This is mainly due to measuring the lipids in the gonads. This method could be used for non-destructive, auto-sorting systems for wild and cultured sea urchins.</p>

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