Evaluation from otolith Sr stable isotope ratios of possible juvenile growth areas of Japanese eels collected from the West Mariana Ridge spawning area

Tsuguo Otake, Yosuke Amano, Kotaro Shirai, Noritaka Mochioka, Toshiro Takahashi, Seinen Chow, Hiroaki Kurogi, Shouzeng Dou, Asuka Yamaguchi, Katsumi Tsukamoto

Research output: Contribution to journalArticle

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Abstract

The widely distributed East Asian Japanese eel Anguilla japonica constitutes a single genetically homogeneous population with a single spawning area near the West Mariana Ridge. Otolith 87 Sr/ 86 Sr ratios of adults (categorized as “river“, “estuarine” or “sea” eels, according to their habitat use history determined from otolith Sr:Ca ratio analysis) collected from the spawning area in 2008 and 2009 were examined in an attempt to determine their juvenile growth areas. In addition, 87 Sr/ 86 Sr ratios of water samples from rivers in China, Taiwan, Korea, and Japan were determined. Otolith 87 Sr/ 86 Sr ratios of the “river”, “estuarine” and “sea” eels were 0.707793, 0.708580-0.709944 and 0.709068, respectively, and water sample ratios from China, Korea, Taiwan, and Japan were 0.7104320-0.7141010, 0.7190826-0.7227976, 0.7115523-0.7146914 and 0.706191-0.712484, respectively. “River” and “estuarine” eels, which had otolith 87 Sr/ 86 Sr ratios less than 0.7092 (seawater ratio), appeared to have inhabited Japanese rivers and/or estuaries because similarly low isotope ratios were recorded only from Japan. However, the juvenile growth areas of other eels were unknown, as their origins could not be determined from otolith 87 Sr/ 86 Sr ratios alone, and required further information regarding otolith elemental and isotope compositions.

Original languageEnglish
JournalFisheries science
DOIs
Publication statusPublished - Jan 1 2019

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Anguilla japonica
eel
otolith
otoliths
stable isotopes
stable isotope
spawning
rivers
river
Japan
Korean Peninsula
Taiwan
isotopes
isotope
China
habitat use
evaluation
estuaries
seawater
water

All Science Journal Classification (ASJC) codes

  • Aquatic Science

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Evaluation from otolith Sr stable isotope ratios of possible juvenile growth areas of Japanese eels collected from the West Mariana Ridge spawning area. / Otake, Tsuguo; Amano, Yosuke; Shirai, Kotaro; Mochioka, Noritaka; Takahashi, Toshiro; Chow, Seinen; Kurogi, Hiroaki; Dou, Shouzeng; Yamaguchi, Asuka; Tsukamoto, Katsumi.

In: Fisheries science, 01.01.2019.

Research output: Contribution to journalArticle

Otake, Tsuguo ; Amano, Yosuke ; Shirai, Kotaro ; Mochioka, Noritaka ; Takahashi, Toshiro ; Chow, Seinen ; Kurogi, Hiroaki ; Dou, Shouzeng ; Yamaguchi, Asuka ; Tsukamoto, Katsumi. / Evaluation from otolith Sr stable isotope ratios of possible juvenile growth areas of Japanese eels collected from the West Mariana Ridge spawning area. In: Fisheries science. 2019.
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abstract = "The widely distributed East Asian Japanese eel Anguilla japonica constitutes a single genetically homogeneous population with a single spawning area near the West Mariana Ridge. Otolith 87 Sr/ 86 Sr ratios of adults (categorized as “river“, “estuarine” or “sea” eels, according to their habitat use history determined from otolith Sr:Ca ratio analysis) collected from the spawning area in 2008 and 2009 were examined in an attempt to determine their juvenile growth areas. In addition, 87 Sr/ 86 Sr ratios of water samples from rivers in China, Taiwan, Korea, and Japan were determined. Otolith 87 Sr/ 86 Sr ratios of the “river”, “estuarine” and “sea” eels were 0.707793, 0.708580-0.709944 and 0.709068, respectively, and water sample ratios from China, Korea, Taiwan, and Japan were 0.7104320-0.7141010, 0.7190826-0.7227976, 0.7115523-0.7146914 and 0.706191-0.712484, respectively. “River” and “estuarine” eels, which had otolith 87 Sr/ 86 Sr ratios less than 0.7092 (seawater ratio), appeared to have inhabited Japanese rivers and/or estuaries because similarly low isotope ratios were recorded only from Japan. However, the juvenile growth areas of other eels were unknown, as their origins could not be determined from otolith 87 Sr/ 86 Sr ratios alone, and required further information regarding otolith elemental and isotope compositions.",
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AU - Mochioka, Noritaka

AU - Takahashi, Toshiro

AU - Chow, Seinen

AU - Kurogi, Hiroaki

AU - Dou, Shouzeng

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AU - Tsukamoto, Katsumi

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