How do you track a fish underwater? Rethinking the conventional, ad hoc approach to acoustic telemetry, scientists have suggested a new state-space model for analyzing fish movement data gathered by marine observation networks. Its goal is to evaluate the doubt associated with this imperfect locating system and to improve its accuracy.
The radio signals that are the central source of traditional GPS cannot pass through seawater. But sound moves extremely well, so scientists often use acoustic telemetry to calculate an individual fish's place. That means attaching an acoustic transmitter to a fish and then using a network of stationary underwater listening stations to monitor for the short clicking sounds to be that these tags emit. When a fish can swim near to a recipient, its click is heard, and its individual code number is recorded.
Underwater Tracking Systems evaluate roles comparative to a framework of baseline stations, which must be implemented prior to functions. In the case of a long-baseline (LBL) program, a set of three or more baseline transponders are implemented on the sea floor. The location of the guideline transponders either comparative to each other or in global coordinates must then be calculated precisely. Some techniques assist this task with an automated acoustic self-survey, and in other cases, GPS is used to determine the position of each baseline transponder as it is implemented or after deployment.
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