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Body size estimation method for seasonally growing farmed yellowtail Seriola quinqueradiata in an aquaculture net cage using a stereo camera

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A Correction to this article was published on 14 April 2024

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To determine the optimal method for monitoring the size distribution of cultivated yellowtail growth, we employed three different approaches: capture measurement, manual measurement using stereo cameras, and automatic measurement through stereo camera-based image recognition technology. Conventional capture measurements showed inadequate prediction interval owing to limited sample size, preventing accurate assessment of growth. Both manual and automatic camera measurements successfully conformed to a growth model exhibiting periodicity. The expected values derived from each model closely matched with the mean of landings conducted at the end of the study. However, the 95% prediction interval for manual measurement with cameras was comparable to that for the landing measurement, whereas the prediction interval for the automatic measurement with cameras was overestimated. Additionally, the growth rate of farmed yellowtail demonstrated seasonal fluctuations. Notably, the mean obtained from a single automatic measurement with cameras, prior to landing, significantly deviated from the overall mean of all measurements. This suggests a potential risk associated with relying on accidental outliers in a single measurement. Therefore, it is crucial to employ a growth model unaffected by outliers in continuous measurements to ensure reliable predictions.

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We sincerely thank Mr. R. Okazaki, Maruha Nichiro Cooperation, and Dr. Y Nishimori, FURUNO Electric Co., Ltd. and all staff of Maruha Nichiro Aquaculture Technology Development Centre Co., Ltd. who help daily operation of this study for their support and for providing the specimens. We also thank the anonymous referees for the detailed suggestions for improving this manuscript. This work was partially supported by JSPS KAKENHI grant no. JP20K06201 and funded research by FURUNO Electric Co. Ltd.


This study was funded by FURUNO ELECTRIN CO. LTD from August 2021 to March 2023 and partially supported by JSPS KAKENHI grant no. JP20K06201 from April 2020 to March 2023.

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Correspondence to Kazuyoshi Komeyama.

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Komeyama, K., Ikegami, A., Fukuda, K. et al. Body size estimation method for seasonally growing farmed yellowtail Seriola quinqueradiata in an aquaculture net cage using a stereo camera. Fish Sci 90, 227–237 (2024).

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