Otolith microstructure of chum salmon Oncorhynchus keta: formation of sea entry check and daily deposition of otolith increments in seawater conditions
Otolith microstructure of chum salmon Oncorhynchus keta: formation of sea entry check and daily deposition of otolith increments in seawater conditions
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DOI：
10.1111/j.1444-2906.2007.01298.x
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发表时间：
2007-02
影响因子：
1.9
通讯作者：
Toshihiko Saito;T. Kaga;J. Seki;T. Otake
中科院分区：
文献类型：
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作者：
Toshihiko Saito;T. Kaga;J. Seki;T. Otake
为了将耳石显微结构应用于近海沃茨大麻哈鱼幼鱼年龄和生长的研究，对海水水族箱和网笼中饲养的大麻哈鱼幼鱼耳石生长进行了研究。在所有的耳石检查，一个独特的检查时，形成的海洋进入的鱼。检查后的耳石增量的沉积是每天在水族箱（57天）和网围栏（26天）饲养。检查形成与入海口也观察到幼鲑耳石收集1公里的海岸Shari，北海道，日本。透射光观察发现，这些鱼的耳石增量外观从黑暗到光明的过渡。耳石Sr：Ca比值由低到高的变化趋势与耳石形态的转变相一致。有人建议，过渡与个人的海上入境。这项研究表明，检查和/或过渡与入海适用于一个基准的幼鲑鲑栖息在沿海沃茨的耳石增量计数。
To apply otolith microstructure to examination of age and growth of juvenile chum salmon Oncorhynchus keta inhabiting coastal waters, formation of otolith increments was investigated for juveniles reared in a seawater aquarium and in net pens. In all otoliths examined, a distinctive check was formed at the time of sea entry of the fish. The deposition of otolith increments after the check was daily for rearing both in the aquarium (57 days) and in the net pens (26 days). Check formation associated with sea entry was also observed in otoliths of juvenile salmon collected 1 km off the coast of Shari, Hokkaido, Japan. Transmitted light observation of otoliths of those fish revealed a transition in otolith increment appearance from dark to light. Otolith Sr: Ca ratio remarkably changed from a low to a high level, coinciding with the transition in otolith appearance. It is suggested that the transition was associated with individual sea entry. This study demonstrated that the check and/or transition associated with sea entry are applicable to a benchmark for otolith increment counts of juvenile chum salmon inhabiting coastal waters.