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<p>Understanding ecological changes in urbanized regions is crucial to sustain the ecosystem services provided by marine environments. Fish growth in Tokyo Bay, Japan, with its highly urbanized watershed, is expected to have changed with environmental and population shifts. Thus, we aimed to assess the decadal changes in the growth of Japanese seabass (<i>Lateolabrax japonicus</i>), a representative fish species that has recently become dominant in Tokyo Bay. Angler-based tagging data of 664 cases collected by the Japan Game Fish Association from 1987 to 2023 were analyzed. Among recapture records of seabass released in Tokyo Bay, 98% were recaptured within the bay or its inflowing rivers. This finding suggests that migration is largely restricted to these areas and growth trends are influenced by factors within the bay. GROTAG models and generalized additive models were applied to estimate growth rates. We found contrasting growth trends between size classes: the growth rates of 30–40&#xa0;cm seabass were lower in 2010–2023 than in earlier periods, whereas the growth rates of 60–70&#xa0;cm seabass gradually increased from the 2000s to the 2020s. These changes may reflect shifts in environmental factors, such as oxygen concentration, and potential density effects driven by seabass population dynamics.</p>

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Size-dependent decadal changes in seabass growth in an urbanized bay revealed by angler-based tagging data

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Kazuha Takai,
  • Takashi Yamakawa,
  • Mari Kuroki

摘要

Understanding ecological changes in urbanized regions is crucial to sustain the ecosystem services provided by marine environments. Fish growth in Tokyo Bay, Japan, with its highly urbanized watershed, is expected to have changed with environmental and population shifts. Thus, we aimed to assess the decadal changes in the growth of Japanese seabass (Lateolabrax japonicus), a representative fish species that has recently become dominant in Tokyo Bay. Angler-based tagging data of 664 cases collected by the Japan Game Fish Association from 1987 to 2023 were analyzed. Among recapture records of seabass released in Tokyo Bay, 98% were recaptured within the bay or its inflowing rivers. This finding suggests that migration is largely restricted to these areas and growth trends are influenced by factors within the bay. GROTAG models and generalized additive models were applied to estimate growth rates. We found contrasting growth trends between size classes: the growth rates of 30–40 cm seabass were lower in 2010–2023 than in earlier periods, whereas the growth rates of 60–70 cm seabass gradually increased from the 2000s to the 2020s. These changes may reflect shifts in environmental factors, such as oxygen concentration, and potential density effects driven by seabass population dynamics.