One of the advantages of using acoustic tags to track fish movement is the ability to recover information from an individual fish without having to recapture it. Acoustic tags transmit an underwater sound signal or acoustic “ping” that sends identification information about the tagged fish. Hydrophone receivers can be deployed to remote locations where they “listen” for tagged fish 24 hours a day. At this particular location a single HTI hydrophone is tethered to an anchor in the middle of the river channel and a reader positioned on the bank records information gathered. A solar panel keeps a 12-volt battery charged and the detection station operational with minimal maintenance.
Photo source: FISHBIO