Abstract
Abstract Acoustic telemetry is increasingly used to observe and monitor animal movements in aquatic environments. Practical deployment mechanisms are needed to sustain consistent data flows in challenging environments. A tripod frame was developed to facilitate the deployment of acoustic receivers on the seabed, allowing for the recovery of all equipment with an acoustic release system. The procedures of deployment and recovery proved to be practical and efficient during a field trial in the North Sea. Compared to a common cabled design, the tripod frame realized a significantly higher detection probability and performed consistently better at greater distance and louder ambient noise. In the context of ocean observation in challenging environments, the tripod frame is a useful tool for temporary and continuous monitoring of tagged fish presence, potentially fitted with additional instruments.
Highlights
Acoustic telemetry enables the observation of animal movements in aquatic environments
A tripod frame was developed to facilitate the deployment of acoustic receivers on the seabed, allowing for the recovery of all equipment with an acoustic release system
The tripod frame facilitates the gathering of tracking data in challenging environments
Summary
Acoustic telemetry enables the observation of animal movements in aquatic environments. For deployment on the seabed, receivers are commonly fixed to a line that is attached to a float and anchored to a weight (Cowley, Bennett, Childs, & Murray, 2017; Ellis et al, 2019; Gazit, Apostle, & Branton, 2013; Hoenner et al, 2018). Two concerns regarding this design are the retrieval of equipment and the variability in receiver orientation.
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