Telemetry

Telemetry is primarily used for tracking large-scale movement patterns of lampreys and fish which shift between different habitats with comparatively high speed in a wide radius. A telemetry system, independently of whether it works with radio waves or, in the case of acoustic telemetry, with sounds, fundamentally consists of an emitter and a receiver. The emitter is preferably applied into the abdominal cavity of a fish. Based on the individual signals sent by the implant, the animal can be located within a radius of up to 500 m from a receiver until the emitter's battery is depleted. While radio telemetry antennas are installed above the water surface, for acoustic telemetry hydrophones are used as receivers underwater. Whether radio or acoustic telemetry is used for a survey depends on the research goal, the environmental conditions in the project area, and the desired period of time the fish has to be tracked.

Acoustic emitter of the JSATS-type

Exposure of a buoy with a hydrophone