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首页> 外文期刊>Aquatic Biology >Otolith elemental and Sr isotopic composition as a natal tag for Biwa salmon Oncorhynchus masou subsp. in Lake Biwa, Japan
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Otolith elemental and Sr isotopic composition as a natal tag for Biwa salmon Oncorhynchus masou subsp. in Lake Biwa, Japan

机译：耳石元素和锶同位素组成作为琵琶鲑鱼Oncorhynchus masou亚种的出生标记。在日本琵琶湖

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摘要

We examined the elemental and Sr isotopic composition of otoliths from Biwa salmon Oncorhynchus masou subsp., an endemic subspecies of the O. masou complex in the Lake Biwa (Japan) water system, to evaluate the usefulness of otolith chemistry as a natural tag for studying homing and migration history. Fish and water samples were collected from 5 major spawning rivers and 2 hatcheries. The elemental content relative to calcium (Na/Ca, Mg/Ca, K/Ca, Mn/Ca, Sr/Ca, and Ba/Ca) and Sr isotopic ratio (87Sr/86Sr) of the samples were analyzed using laser ablation inductively coupled plasma mass spectrometry and thermal ionization mass spectrometry, respectively. Significant variations in otolith and water sample chemistry were detected. We also observed significant relationships between the Sr/Ca, Ba/Ca, and 87Sr/86Sr ratios of otoliths and those of ambient water samples from which the fish were collected. The other elemental ratios and all elemental concentrations in the otoliths showed variations independent of water chemistry. Jackknife cross-validation using quadratic discriminant function analysis showed that otolith elemental composition could classify Biwa salmon juveniles by sampling location, with a high level of accuracy (mean 79%). The mean accuracy increased to 89% when Sr isotopic ratios were combined with elemental data. This study thus demonstrated the suitability of otolith chemistry for determining fish distribution. Otolith chemistry successfully revealed the natal (hatching) locations ofindividual fish, facilitating further understanding of migration history and habitat use, which are essential for establishing effective fishery management strategies for this Near Threatened subspecies.
机译：我们研究了琵琶鲑鱼Oncorhynchus masou亚种（琵琶湖（日本）水系统中O. masou复合体的特有亚种）中耳石的元素和Sr同位素组成，以评估耳石化学作为研究天然标签的有用性归巢和迁移历史。鱼和水样本是从5条主要产卵河和2个孵化场收集的。使用感应烧蚀法分析了样品中相对于钙的元素含量（Na / Ca，Mg / Ca，K / Ca，Mn / Ca，Sr / Ca和Ba / Ca）和Sr同位素比（87Sr / 86Sr）。耦合等离子体质谱和热电离质谱。检测到耳石和水样化学的显着变化。我们还观察到耳石的Sr / Ca，Ba / Ca和87Sr / 86Sr比与从中收集鱼的环境水样品的比之间存在显着关系。耳石中的其他元素比率和所有元素浓度均显示出与水化学无关的变化。利用二次判别函数分析进行的刀切交叉验证表明，耳石元素成分可以通过采样位置对琵琶鲑鱼的幼体进行分类，准确性很高（平均为79％）。当Sr同位素比与元素数据结合使用时，平均准确度提高到89％。因此，这项研究证明了耳石化学在确定鱼类分布方面的适用性。耳石化学成功地揭示了个体鱼类的出生（孵化）位置，有助于进一步了解迁徙历史和栖息地使用，这对于建立该濒危亚种有效的渔业管理战略至关重要。

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