None of the current methods used by marine biologists keeps accurate track of where an animal carrying the tag has been. That's where sonic beacons are stepping in
Save time by listening to our audio articles as you multitaskThat does not stop people tagging sea creatures. Data collected and stored in a tag can either be sent to a satellite in bursts if the species in question is one that comes to the surface from time to time, or the tag can be dispatched on a one-way trip to the surface after a set period. A tag may also be recovered if the animal carrying it is caught by a fishing boat.
Godi Fischer of the University of Rhode Island is one of those attempting this receiver-shrinking. His latest offering, now being tested on submersible drones called gliders, is 24mm long, 11mm in diameter and weighs just nine grams. That makes it tiny enough to be attached to a range of marine creatures. Even if the recipient is not in achannel, Dr Fischer says there is enough leakage from such channels for it to pick up a signal at a distance of perhaps 100km. Each tag costs just $200.
Dr Thorrold suspects it may be related to the way the fish interact with so-called mesoscale features. These are gyres tens of kilometres across which last for a month or so. In particular, a type of feature called a warm-core eddy may be crucial for populations of prey species. Plotting the way swordfish move in relation to eddies could reveal much about the workings of the marine ecosystem.
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