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http://dx.doi.org/10.7850/jkso.2013.18.4.206

Food Habits of the Glass eel Anguilla japonica in the West Coast Estuaries of Korean Peninsula Determined by Using C and N Stable Isotopes  

Kim, Jeong Bae (National Fisheries Research and Development Institute)
Lee, Won-Chan (National Fisheries Research and Development Institute)
Kim, Dae-Jung (National Fisheries Research and Development Institute)
Seong, Ki Baik (National Fisheries Research and Development Institute)
Choi, Hee-Gu (National Fisheries Research and Development Institute)
Choi, Woo-Jeung (National Fisheries Research and Development Institute)
Hwang, Hak Bin (National Fisheries Research and Development Institute)
Hong, Sokjin (National Fisheries Research and Development Institute)
Kim, Hyung Chul (National Fisheries Research and Development Institute)
Park, Sung-Eun (National Fisheries Research and Development Institute)
Shim, Jeong Hee (National Fisheries Research and Development Institute)
Kang, Chang-Keun (Ocean Science & Technology Institute, Pohang University of Sciences and Technology)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.18, no.4, 2013 , pp. 206-213 More about this Journal
Abstract
Glass eels (Anguilla japonica) are caught in the west coast of Korea on their migratory route from the breeding grounds in the Mariana Trench along the North Equatorial Current and the Kuroshio Current. To identify the food source of natural glass eels, we analyzed the stable C and N isotopes of glass eels caught in April 2012 and investigated possible food sources in the survey area. In particular, with respect to the stable C and N isotopes of particulate organic matter, we extended the surveying area to the northern parts of East China Sea as well as the west coast of Korea. The stable C and N isotope ratios of the glass eels caught in the west coast were found to be $-20.7{\pm}0.1$‰ and $5.0{\pm}0.2$‰, respectively. The stable C and N isotope ratios of the particulate organic matter in the west coast of Korea, in which the glass eels are assumed to eat the particulate organic matter as food source, were estimated to be $-24.0{\pm}0.3$‰ and $2.8{\pm}0.4$‰, respectively. Similar data were obtained from the northern part of the East China Sea, $-24.5{\pm}0.5$‰ and $0.8{\pm}0.3$‰. The stable isotope ratios showed values differing from the stepwise increasing rates up the food web in natural aquatic ecosystem, showing that particulate organic matter in the west coast of Korea and East China Sea was not served as the glass eels food source. This result suggested that the glass eels caught in the west coast might not assimilate nutrition from the marine environment during long migration.
Keywords
Glass eel; Anguilla japonica; Food web; Stable isotopes; Trophic level;
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Times Cited By KSCI : 2  (Citation Analysis)
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