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Enhanced local recruitment of glass eel Anguilla japonica in Oyodo River, Miyazaki and offshore environmental conditions in 2002

  • Kazuhiro Aoki
  • Toshihiro Yamamoto
  • Nobuto Fukuda
  • Kazuki Yokouchi
  • Hiroaki Kurogi
  • Takashi Setou
  • Hiroshi Kuroda
  • Takahiko Kameda
  • Kazuhiro Takafuji
  • Tsutomu Tokeshi
Original Article Biology

Abstract

To examine the environmental factors controlling the inshore recruitment dynamics of Anguilla japonica in the Oyodo River, Miyazaki Prefecture, Kyushu, glass eel samplings were carried out using fyke nets during winter (November–March) of 1994–2014. The peak CPUEs (catch per unit effort) were observed between November and February, but differed from year to year. The yearly CPUE was extremely high in 2002, when the sea surface temperature (SST) in the offshore area of the Oyodo River was the lowest in winter of all the sampling years. The negative SST anomaly of less than − 0.5 °C was sustained in the offshore area during the recruitment season in 2002, which was caused by two combined factors; low air temperature and the Kuroshio path. The oceanographic data showed that the dominant path of the Kuroshio was displaced eastward at 31°N in 2002, which was different from the average Kuroshio path. The eastward displacement of the Kuroshio induced a cyclonic mesoscale eddy in the offshore area of the Oyodo River, resulting in the entrainment of the cold seawater into coastal waters from deep water. The oceanographic condition in relation to the continuous low SST could be favorable for local recruitment of glass eels.

Keywords

Anguilla japonica glass eels Low seawater temperature Kuroshio Cyclonic eddy Oyodo River 

Notes

Acknowledgements

This research was partly commissioned by the Fisheries Agency of Japan and grants from the Japan Fisheries Research and Education Agency. We are grateful to the Japan Meteorological Agency and Ministry of Land, Infrastructure, Transport and Tourism, Japan for providing the observational data. We used the supercomputer of the Japan Agriculture, Forestry and Fisheries Research Information Technology Center for analyses.

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Copyright information

© Japanese Society of Fisheries Science 2018

Authors and Affiliations

  • Kazuhiro Aoki
    • 1
  • Toshihiro Yamamoto
    • 2
  • Nobuto Fukuda
    • 2
  • Kazuki Yokouchi
    • 2
  • Hiroaki Kurogi
    • 2
  • Takashi Setou
    • 1
  • Hiroshi Kuroda
    • 1
    • 3
  • Takahiko Kameda
    • 1
  • Kazuhiro Takafuji
    • 4
  • Tsutomu Tokeshi
    • 5
  1. 1.Japan Fisheries Research and Education AgencyNational Research Institute of Fisheries ScienceYokohamaJapan
  2. 2.Arasaki Marine Biological Station, Japan Fisheries Research and Education AgencyNational Research Institute of Fisheries ScienceYokosukaJapan
  3. 3.Japan Fisheries Research and Education AgencyHokkaido National Fisheries Research InstituteKushiroJapan
  4. 4.Miyazaki Prefectural Inland Waters Fisheries Promotion CenterMiyazakiJapan
  5. 5.Fisheries Research InstituteMiyazaki Prefectural GovernmentMiyazakiJapan

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