Fischmonitoring
Fishmonitoring
Tagging Techniques: Pop-up-Tags
Floating-up GPS-transmitters
...are being used more and more in the years past to monitor long distance fish migration routes (mainly at sea). These transmitters record GPS-Position, water depth, water temperature and light intensity. After a defined interval the transmitters detach from the test animal and float up to the surface. Once at the surface they send the recorded data to a satellite. From the satellite the data are transferred to a local computer that provides the data for analysis. Photo above shows a salmon that has been equipped with a pop-up-tag.
(source: http://www.miramichisalmon.ca/reward-offered-for-salmon-tagged-in-study/ ).
These investigations revealed interesting results with after-spawning-salmon (kelts). For kelts from Danish River Skjernau for example it has been found that they migrate up to the East-coast of Greenland and as far as Svalbard high in the North (red dots). Irish salmon (grey dots) on the other hand stayed far more South.
(Source of the graphic: http://www.salmoncomeback.org/wp-content/uploads/sites/14/2016/01/S_11.4_Frederick_Whoriskey-1.pdf on page 7.)
Known applications - do you know others? If yes, please give notice to: mail[at]wanderfische.eu
