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美国华盛顿州国家海洋渔业中心的科学家正在应用新方法跟踪洄游的鲑。在幼鲑离开孵化场前,他们将一微电子装置插入鲑体内。这一装置对发自斯内克河和哥伦比亚河大坝上监测点的400千赫信号作出反应。该装置的天线接收来自监测点的信号并通过感应电流驱动芯片上的集成电路。每个装置均包括一个编程的微芯片,在感应激活时能发射一种独特的信号。在鲑游入海的过程中,对其无需处理便可记录到有关鲑的成活率、分布状况和洄游
Scientists at the National Marine Fisheries Center in Washington State are using new methods to track migratory salmon. Before the baby salmon leaves the hatchery, they insert a microelectronic device into the salmon. The device reacts to the 400 kHz signal from the monitoring points on the Snake River and the Columbia River dam. The antenna of the device receives the signal from the monitoring point and drives the integrated circuit on the chip by the induced current. Each device includes a programmed microchip that emits a unique signal when the sensor is activated. In the course of swimming into saltwater salmon, its survival rate, distribution and migration related to salmon can be recorded without treatment