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Fig. 1 | Animal Biotelemetry

Fig. 1

From: An acoustic sensor transmitter for in situ assessment of water quality and fish behaviour during chemical treatment of a parasite-infected river system: tag design and practical use

Fig. 1

The conductivity and temperature acoustic transmitter tag (CondTag) with three concurrent transmitter functions. Transmitter function (i) sends S256-encoded messages on odd IDs that contain instantaneous measurements of conductivity and temperature, where the data byte is split in two 4-bit values serving as indices into a look-up table specifying predefined conductivity and temperature intervals. Transmitter function (ii) sends S256-encoded messages on even IDs that contain information reporting how many hours over the last 45 h the tag has resided in two predefined water quality categories (WQC) defined on the basis of time averages and fluctuations in conductivity measurements. See Table 1 for a description of the WQCs. Transmitter function (iii) runs in parallel with function (i) and (ii) and emits a 20-ms acoustic “pinger” pulse every 5 s on one of three selectable tracking frequencies (72, 75 and 78 kHz), and is included to enable manual localization and tracking of the fish using manual receivers with a directional hydrophone. The inset image shows the tag with a 4-pole conductivity cell embedded in its endcap. The temperature sensor (not seen) is located on the opposite side of the endcap

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