Migratory history of the Japanese eeI Anguilla japonica, as revealed by otolith microchemistry and stable isotope markers

通过耳石微化学和稳定同位素标记揭示日本鳗鲡的迁徙历史

• 批准号: 13660185
• 负责人: MOCHIOKA Noritaka
• 金额: $ 2.3万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13660185/
• 关键词: Japanese eel; Anguilla japonica; Otolith; Migratory history; Sr; Ca; Growth; 微量元素分析

Environmental history of the Japanese eel Anguilla japonica collected from Omura Bay (54 Yellow eels, Kumamoto Pref.), Kuma River estuary (48 Yellow eels, Nagasaki Oref.), and East China Sea (7 Silver eels) were studied by examining strontium (Sr) and calcium (Ca) in their otoliths with wavelength dispersive X-ray spectrometry on an electron microprobe. The Sr/Ca ratios in the otoliths changes with both ontogenetic development and salinity of the habitat. The rarios significantly different between brackish and fresh water.The pattern change of the Sr/Ca ratios outside the freshwater mark indicated three types of migratory history : (A) river eels, (B) estuarines eels and (C) estuarine eeis with short period river life. According to the otolith Sr/Ca ratios, the occurrence of type A was 14% for Omura Bay, 15% for Kuma river estuary, and 14% for East China Sea and that of (B), 74% for Omura Bay, 62% for Kuma river estuary, 43% for East China Sea and that of (C), 12% for Omura Bay, 23% for Kuma river estuary, 43% for East China Sea. There was no difference in growth between each types.

大村湾日本鳗鲡的环境历史（54条黄鳝，熊本Pref.）熊川河口（48条黄鳗，长崎俄勒冈州），用电子探针波长色散X射线能谱法测定了中国南海和东海（7条银鳗）耳石中Sr和Ca的含量。耳石中Sr/Ca比值随个体发育和生境盐度的变化而变化。淡水界线外的Sr/Ca比值变化模式表明，淡水界线外有3种类型的洄游历史：（A）河鳗，（B）河口鳗，（C）河口鳗，河流生活期较短。根据Sr/Ca比值，A型在大村湾为14%，熊麻河口为15%，东海为14%，（B）型为74%，熊麻河口为62%，东海为43%，（C）型为12%，大村湾为12%，熊麻河口为23%，东海为43%。两种类型之间的生长没有差异。