Abstract Fish telemetry is a potential method to monitor the well-being of farmed fish, where a reference group of fish are equipped with sensors tags that oversee their health and wirelessly transmit the data. Many fish must be tagged to get statistically reliable information. In this paper, very-high-frequency (250 kHz) acoustic channels are characterized using data recorded in an Atlantic salmon pen containing 180 000 fish. The results reveal vertical pen channels characterized by a direct path and a delayed tail of fluctuating multipath arrivals with an angular spread and a coherence time of order 14 ms. It is demonstrated that multichannel equalization applied to a 64-element hydrophone array enables high-speed (78 kbps) coherent communication in short bursts. We discuss the possibilities of using high-speed acoustic communication for fish telemetry and show that it has the potential of serving hundreds of distributed unsynchronized fish tags.

中文翻译：

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商业大西洋鲑鱼围栏内的相干高速声学通信

摘要 鱼类遥测是一种监测养殖鱼类健康状况的潜在方法，其中一组参考鱼类配备了传感器标签，可以监测它们的健康状况并无线传输数据。许多鱼必须贴上标签才能获得统计上可靠的信息。在本文中，使用包含 180 000 条鱼的大西洋鲑鱼围栏中记录的数据来表征甚高频 (250 kHz) 声学通道。结果揭示了垂直笔信道，其特征是直接路径和波动多径到达的延迟尾部，具有角扩展和 14 ms 的相干时间。结果表明，应用于 64 单元水听器阵列的多通道均衡能够在短脉冲串中实现高速 (78 kbps) 相干通信。