Analysis of migration paths and life histories of aquatic animals by means of biotelemetry system

1996年对鱼类耳石中的微量元素进行了分析，以直接估计鱼类的生活史。1997年，我们尝试用微量元素分析与微数据标签相结合的方法直接测量鱼类的生活史。微量元素分析结果表明，鲑鱼耳石中最有效的元素是锶。这个元素特别适用于了解鲑鱼从河流游到海边或从海洋游到河流产卵时的时间周期，因为海水中的锶浓度比淡水高100倍。耳石中锶的浓度直接受环境水浓度的影响。1997年10 - 11月，在相模湾对黄尾鱼幼鱼进行了微数据标签实验。从实验鱼身上回收了12个标签，并分析了它们的数据。

Trace element in fish otoliths were analyzed in 1996 to estimate the life histories of fish in derectly. In 1997, we tried to measure life histories of fish directly by means of micro-data tags in parallel with trace element analysis. The results of trace element analysis indicated that most available element is Sr in salmon otolith. This element especially available to understand the temporal period of salmon when swimming down to the sea side from river or swimming up from the sea to river to spawn, since Sr soncentration in sea water is higher 100 time than the fresh water. And Sr concentration in the otolith is directly influenced by the concentration in environmental water. The micro-data tag experiment was carried out using young yellow tail fish in the period of October and November at the Sagami Bay in 1997. The 12 tags were recovered from the experimental fish and analyzed their data.