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Quantitative protocols for exploring the optimal measurement points for estimating body length and weight from otolith information using the blackthroat seaperch in the western Sea of Japan

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Abstract

The accuracy of the back-calculation method to estimate past individual growth based on the relationship between otoliths and body length is important. However, limited studies have examined the variation in accuracy by measurement site used for estimation, and little has been done to evaluate its effectiveness. Currently, effective utilization of juvenile fish in the blackthroat seaperch fishery in the Sea of Japan does not always take place, so it is necessary to investigate the complex relationship between population density and growth rate. This study estimates body length and weight from otolith length, weight, and area of blackthroat seaperch, analyzes variations in estimation accuracy at each measurement site, and provides a general quantitative protocol for evaluating the performance of each measurement site. The conversion models for body length and body weight indicate that models using otolith weight and area are more accurate than those using otolith length. There were no significant differences in the estimation accuracy of these models, and the estimation errors were all less than 0.7% of the original body length and weight means. Searching for the best model, verifying the estimation accuracy quantitatively, and selecting the model to use is important when performing back-calculations.

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Data availability

The data supporting the findings of this study are available from the corresponding author, MK, upon reasonable request.

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Acknowledgements

We are grateful to Shimane Prefecture for sampling and supporting our study. We also express our appreciation to the two reviewers and the editor.

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Shimane Prefecture.

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Correspondence to Minoru Kanaiwa.

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Conflict of interest

The research was conducted as part of Sorata Tanaka's graduation and master's studies from October 2018 with the cooperation of Shimane Prefecture, and based on the data, the analysis methods were reviewed and compiled. It was also part of a joint research project between Mie University and Shimane Prefecture, which provided significant assistance in the sampling. There is nothing special to report regarding conflicts of interest with the content of the research.

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Tanaka, S., Kato, M., Kanamoto, Y. et al. Quantitative protocols for exploring the optimal measurement points for estimating body length and weight from otolith information using the blackthroat seaperch in the western Sea of Japan. Fish Sci (2024). https://doi.org/10.1007/s12562-024-01764-3

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  • DOI: https://doi.org/10.1007/s12562-024-01764-3

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