Enhanced local recruitment of glass eel <Emphasis Type="Italic">Anguilla japonica</Emphasis> in Oyodo River,Miyazaki and offshore environmental conditions in 2002 |
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| Authors: | Kazuhiro Aoki Toshihiro Yamamoto Nobuto Fukuda Kazuki Yokouchi Hiroaki Kurogi Takashi Setou Hiroshi Kuroda Takahiko Kameda Kazuhiro Takafuji Tsutomu Tokeshi |
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| Institution: | 1.Japan Fisheries Research and Education Agency,National Research Institute of Fisheries Science,Yokohama,Japan;2.Arasaki Marine Biological Station, Japan Fisheries Research and Education Agency,National Research Institute of Fisheries Science,Yokosuka,Japan;3.Japan Fisheries Research and Education Agency,Hokkaido National Fisheries Research Institute,Kushiro,Japan;4.Miyazaki Prefectural Inland Waters Fisheries Promotion Center,Miyazaki,Japan;5.Fisheries Research Institute,Miyazaki Prefectural Government,Miyazaki,Japan |
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| 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. |
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