We validated the performance of two types of predation sensors on acoustic telemetry transmitters in a combined field and laboratory study design using juvenile Atlantic Salmon Salmo salar and a predator large Brown Trout Salmo trutta. One tag model was outfitted with an acid-sensitive predation sensor, and the other was equipped with a tilt-based orientation sensor. We found similar response times for the two tag types to identify a predation event (time between known ingestion of a tagged fish and triggering of the predation sensor). However, the orientation sensor model was more accurate in laboratory trials, correctly identifying 100% of events in which predators were fed the tagged fish, whereas correct identification of predation events was 50% for the acid-sensitive sensor in similar trials. The acid-sensitive tags were smaller (0.65 g in air), and all 10 were eventually expelled by predators in the laboratory (2–22 d after tag ingestion). By contrast, only two of five tags with orientation sensors (1.4 g in air) were expelled in a similar period (13 and 16 d after tag ingestion). Both tags had distinct benefits: acid-sensitive sensor tags were very small, and orientation sensor tags were seemingly more accurate and transmitted raw orientation data to receivers for postprocessing.

中文翻译：

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两种不同捕食传感器的实验室和现场实验验证，用于渔业研究中的声学发射器仪表

我们使用的少年大西洋鲑鱼验证了联合现场和实验室研究设计两种类型的声学遥测发射机捕食传感器的性能大西洋鲑和大捕食褐鳟鲑 鳟. 一个标签型号配备了酸敏感捕食传感器，另一个配备了基于倾斜的方向传感器。我们发现两种标签类型的响应时间相似，以识别捕食事件（已知摄入标记鱼与触发捕食传感器之间的时间）。然而，方向传感器模型在实验室试验中更准确，正确识别捕食者被喂食标记鱼的事件 100%，而在类似试验中，酸敏感传感器正确识别捕食事件的准确率为 50%。酸敏感标签较小（空气中 0.65 克），所有 10 个最终都被实验室中的捕食者驱逐（标签摄入后 2-22 天）。相比之下，五个标签中只有两个带有方向传感器 (1. 空气中 4 克）在相似的时间段内（标签摄入后 13 和 16 天）被排出。两种标签都有明显的优势：对酸敏感的传感器标签非常小，方向传感器标签似乎更准确，并将原始方向数据传输到接收器进行后处理。