IPHC to test revamped halibut tracking iTags in Glacier Bay next month (Fish Radio)
SEAFOODNEWS.COM [Fish Radio with Laine Welch] September 23, 2014
A project that uses Smart Phone technology to track halibut is being retweaked. The internal tags, which are the first to test geomagnetism to track fish migrations, were implanted in 30 halibut over two years ago. The iTags record magnetic field strength on three axes and have accelerometers and pitch and roll detectors. But it turns out, magnets were the tags undoing.
"The early version of the tags we deployed in 2011 had some metal components inside that were actually picking up magnetic charges and maintaining those charges and screwing up the calibrations by the time we got them back there was no way to really track the fish."
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