Predicting non-native channel catfish expansion in Lake Biwa based on past capture data and swimming performance measurement ―Channel Catfish Behavior Research Group―

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  • 琵琶湖における外来魚アメリカナマズの捕獲情報収集および遊泳能力計測に基づく分布拡大予測 ―チャネルキャットフィッシュ行動研究グループ―

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<p>Recently, non-native channel catfish Ictalurus punctatus, an invasive alien species in Japan, has been repeatedly caught in Lake Biwa. However, the speciesʼ present status in the lake is unclear, and there seem to be more unreported capture records than have been reported. To reveal its distribution in the lake, we collected capture records of channel catfish from citizens including leisure anglers. In addition, we quantified its thermal tolerance using a swimming chamber to predict its dispersal in the Lake Biwa/Yodo River basin. Our survey has revealed that 314 individuals were caught across the basin during 2005–2019. While most of the capture records occurred near the Setagawa Weir, some records were reported from the Uji and the Kizu River in Kyoto Prefecture, the Yodo River in Osaka Prefecture, and the Nunome River in Nara Prefecture, indicating the speciesʼ range expansion in the downstream direction. Moreover, our laboratory experiments have confirmed the speciesʼ thermal tolerance up to 40 ºC in summer season. Yet the species has been caught only three times in the North basin of Lake Biwa for 5 years, it may also expand its range in the area, where the average water temperature during summer has rising gradually along with global warming.</p>

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Details 詳細情報について

  • CRID
    1390004222629001216
  • NII Article ID
    130007919082
  • DOI
    10.32215/pronatura.29.0_150
  • ISSN
    21897727
    24320943
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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