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

Autor:	Toshiro Takahashi, Kotaro Shirai, Shouzeng Dou, Tsuguo Otake, Hiroaki Kurogi, Asuka Yamaguchi, Yosuke Amano, Seinen Chow, Katsumi Tsukamoto, Noritaka Mochioka
Rok vydání:	2019
Předmět:	0106 biological sciences geography education.field_of_study geography.geographical_feature_category biology Stable isotope ratio 010604 marine biology & hydrobiology Population Estuary 04 agricultural and veterinary sciences Aquatic Science biology.organism_classification 01 natural sciences medicine.anatomical_structure Oceanography Habitat 040102 fisheries medicine 0401 agriculture forestry and fisheries Environmental science Juvenile Seawater Japanese eel education Otolith
Zdroj:	Fisheries Science. 85:483-493
ISSN:	1444-2906 0919-9268
DOI:	10.1007/s12562-019-01304-4
Popis:	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 87Sr/86Sr 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, 87Sr/86Sr ratios of water samples from rivers in China, Taiwan, Korea, and Japan were determined. Otolith 87Sr/86Sr 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 87Sr/86Sr 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 87Sr/86Sr ratios alone, and required further information regarding otolith elemental and isotope compositions.
Databáze:	OpenAIRE
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