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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50141

Title: Identification and growth rates comparison of divergent migratory contingents of Japanese eel (Anguilla japonica)
Authors: Wann-NianTzenga
Hideo POkac
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: Japanese eel
Sr/Ca ratio
Environmental history
Date: 2003
Issue Date: 2018-09-17T03:34:56Z
Publisher: Aquaculture
Abstract: Abstract: The strontium (Sr) and calcium (Ca) concentrations in the otoliths of the Japanese eels Anguilla japonica collected from China, Japan and Taiwan were measured by electron probe micro-analyzer. The Sr/Ca ratios indicated that the eels beyond elver stage can be classified into three types of migratory contingents. Type 1 (seawater), the Sr/Ca ratios from approximately 150 μm from primordium to edge of the otolith maintained at the level of approximately 4–10‰, indicating that the eel after elver stage stayed in sea water until the silver eel stage. Type 2 (freshwater), the ratios were lower than 4‰, indicating that the eel stayed in freshwater from elver stage to the silver eel stags. Type 3 (estuarine), the ratios fluctuated between those of Types 1 and 2, indicating that eel migrated between freshwater and sea water before the silver stage. The estuarine contingents constituted the majority of the eel population and grew faster than the freshwater contingents.
Relation: 216(1-4) pp.77-86
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50141
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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