Abstract
This study used a delta-lognormal model to analyze monthly catches of age-0 Pacific bluefin tuna by the troll fishery. The model included fixed effects of month, area, and month–area interaction, and random effects of port, year and port–year interaction. The catch patterns by month and area predicted by the statistical model (standardized catch) revealed that main fishing grounds along the Tsushima Warm Current generally shifted from north to south as the season turned from autumn to winter. In contrast, the standardized catch along the Kuroshio Current did not show such clear spatiotemporal patterns. The standardized catch along the Tsushima Warm Current is significantly associated with average monthly sea surface temperatures in the fishing grounds and consistent with migration routes revealed by tagging experiments in previous studies. These associations indicate the spatiotemporal catch pattern in the Tsushima Warm Current region partly reflects seasonal migration. Knowledge of the possible associations among fish migration, environmental factors and spatiotemporal distribution of the catch will contribute to future management of this species.
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Acknowledgments
All scientists at the local fisheries institutes of Shizuoka, Mie, Wakayama, Kochi, Kagoshima, Nagasaki, Yamaguchi and Shimane prefectures are appreciated for providing the catch data used in this study. Thanks are extended to two anonymous reviewers and the associate editor Prof. Hiramatsu for their valuable and constructive comments. This study was financially supported by the Fisheries Agency of Japan. SAS software (ver. 9.4) used in this study was provided by AFFRIT, MAFF, Japan.
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Ichinokawa, M., Okamura, H., Oshima, K. et al. Spatiotemporal catch distribution of age-0 Pacific bluefin tuna Thunnus orientalis caught by the Japanese troll fishery in relation to surface sea temperature and seasonal migration. Fish Sci 80, 1181–1191 (2014). https://doi.org/10.1007/s12562-014-0806-y
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DOI: https://doi.org/10.1007/s12562-014-0806-y