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Otolith elemental analyses for migration history of fishes

鱼类洄游历史的耳石元素分析

基本信息

批准号：
14360109
负责人：
OTAKE Tsuguo
金额：
$ 7.49万
依托单位：
The University of Tokyo (2004)Mie University (2002-2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14360109/
关键词：
Fish Otolith Otolith Sr : Ca ratio Otolith microstructure Otolith oxygen isotope ratio Carbon and nitrogen isotope ratio Migration history Metamorphosis Sr : Ca比アユマアナゴ炭素・窒素安定同位体比ウナギ回遊成長微量元素酸素同位体比

项目摘要

1.Distribution and migration of Ayu.Age, birthdate, and migration history were examined for larvae and juveniles collected from coastal waters around the mouth of Miya river, Mie prefecture, and for adult fish from Miya river and Nagara river, Gifu Prefecture, using otolith microstructure and microchemistry (Sr : Ca ratio). After drifting into the sea, the larvae shifted the distribution from the coastal areas to the surf zone before they grew to 20 mm long. They subsequently occurred in the estuary after they reached 30-40mm, and then began their upstream migration. The earlier born and larger size juveniles tended to go upstream earlier in the spring. Furthermore, fish that were born earlier and underwent the upstream migration earlier at a larger size showed a tendency to spawn earlier and larger size. We also examined carbon and nitrogen stable isotopic compositions of "Shio-ayu" which distributes in the lowest reach in Choshi river, Mie Prefecture, and determined that it distribut … More ed in estuary and feed on estuarine attached algae as a major food.2.Migration of the Japanese eel.Otolith oxygen isotopic composition of glass eels collected from Tanegashima Island, Japan, was examined for determining the spawning temperature and depth. The oxygen isotopic composition of the otolith core was not different from those of otolith neighboring region deposited during leptocephalus stage, suggesting that the spawning temperature and depth were 12-28℃ and 320-50 m in the water column, respectively. Otolith microstructure and microchemistry (Sr : Ca ratio) of glass eels recruited in Ise bay and Kushimoto, Wakayama Prefecture, suggested that the duration of coastal migration was 20-24 days. The duration between the arrival at coastal waters and recruitment was estimated to 9-12 days. There was no difference in those durations among glass eels from the two sampling sites. The glass eels were suggested to migrate directly to each. river they recruited after they detrained from the Kuroshio.3.Migration and metamorphosis of Conger eel.Otolith microstructure and microchemistry (Sr : Ca ratio) of conger eel larvae collected from Ise bay and Hamashima, Mie Prefecture, and Oarai, Ibaraki Prefecture, were examined. There was no difference in ages at recruitment and at beginning of metamorphosis among the larvae collected from three sampling sites. They were found to undergo one month coastal migration with beginning of metamorphosis, after 3 month oceanic migration. Organ differentiation was completed for 60-80 days after the beginning of metamorphosis with the functional establishment of stomach. Less

1.阿玉的分布与迁移。采用耳石显微结构和微量化学（Sr: Ca）测定方法，对采自三重县宫宫河河口附近沿海水域的幼鱼、幼鱼以及采自岐阜县宫宫河和长原河的成鱼进行了年龄、出生和洄游史分析。漂入海后，幼虫在长到20 mm之前，从沿海地区向冲浪区转移分布。在水深达到30 ~ 40mm后，在入海口发生，并开始向上游迁移。出生较早、体型较大的幼鱼倾向于在春季较早逆流而上。此外，出生较早、上游洄游较早、体型较大的鱼类，产卵时间较早、体型较大。研究了分布在三重县长实河下游的“Shio-ayu”的碳氮稳定同位素组成，确定其主要分布在河口，以河口附着藻为主要食物。日本鳗鱼的迁徙。对采集自日本种子岛的玻璃鳗耳石氧同位素组成进行了测定，以确定其产卵温度和深度。耳石岩心氧同位素组成与钩头期耳石周边沉积区氧同位素组成无明显差异，提示其产卵温度为12 ~ 28℃，产卵深度为320 ~ 50 m。在和歌山县伊势湾和Kushimoto捕获的玻璃鳗耳石微观结构和微化学（Sr: Ca比）表明，玻璃鳗的沿海迁移时间为20 ~ 24天。从抵达沿海水域到招募人员的时间估计为9-12天。在两个采样点的玻璃鳗中，这些持续时间没有差异。建议玻璃鳗鱼直接迁移到每一个。他们从黑潮撤退后招募了一条河。长鳗的迁徙与变态。对采自三重县伊势湾、滨岛和茨城县大斋的长鳗幼鳗进行了耳石微观结构和微化学（Sr: Ca）测定。三个采样点采集的幼虫在采食时和变态开始时的年龄没有差异。发现它们经过一个月的沿海迁徙，开始蜕变，三个月的海洋迁徙。器官分化在变态开始后60-80天完成，胃功能建立。少