Despite intensive management, the increasing conflict between humans and saltwater crocodiles in places such as Queensland, Australia, has led to the investigation of alternative techniques to improve public safety. The reliability of digital video surveillance systems (DV) placed above water and multi-beam sonar (sonar) placed under water to detect and monitor saltwater crocodiles was tested in a seminatural freshwater environment over a 2 h period (16:00–18:00 h). A total of 29 crocodiles were detected within the study area using DV, and 28 with sonar. One was obscured by a section of bank, and thus not visible on sonar. Of the 28 crocodiles detected by both methods, sonar recorded both entry and exit for all, while DV recorded both entry and exit for 15 crocodiles. The length of time that crocodiles were detected was longer on average for sonar (4 min 27 s) compared with DV (2 min 50 s). This reflected the time spent above (detected by sonar and DV) or below water (not detected by DV), as only sonar was able to detect crocodiles underwater. The use of sonar may provide a valuable management tool for detecting and monitoring saltwater crocodiles in areas frequented by people (e.g. beaches, boat ramps, upper freshwater areas) where there is a high chance of a negative interaction.

尽管进行了密集的管理，但人类与澳大利亚昆士兰州的咸水鳄之间的冲突日益加剧，导致人们对改善公共安全的替代技术进行了研究。在半天然的淡水环境中，在2小时内（16：00-18：00），对置于水上的数字视频监视系统（DV）和置于水下的多束声纳（声纳）的可靠性进行了检测，以检测和监测盐水鳄鱼。 H）。使用DV在研究区域内总共检测到29条鳄鱼，使用声纳检测到28条鳄鱼。一个人被一段河堤遮住了，因此在声纳上看不见。在这两种方法检测到的28条鳄鱼中，声纳记录了所有鳄鱼的进入和退出，而DV记录了15条鳄鱼的进入和退出。与DV（2分钟50 s）相比，声纳检测到鳄鱼的时间平均更长（4分钟27 s）。这反映了在声波和DV探测上方或水下或DV探测不到水下所花费的时间，因为只有声纳才能够探测到水下的鳄鱼。声纳的使用可能提供一种有价值的管理工具，用于检测和监视在人们经常出入的地方（例如海滩，船舷梯，淡水上游地区），其中有很大的负面影响，它们中的咸水鳄。