Natures wonders: American eels migrate to mate (Introduction)

by David Turell @, Wednesday, October 28, 2015, 00:28 (1423 days ago) @ David Turell

About 2,400 km to the Sargasso Sea:

http://phys.org/news/2015-10-year-old-mystery-adult-eel-sargasso.html

After more than a century of speculation, researchers have finally proved that American eels really do migrate to the Sargasso Sea to reproduce. A team supervised by Professor Julian Dodson of Université Laval and Martin Castonguay of Fisheries and Oceans Canada reports having established the migratory route of this species by tracking 28 eels fitted with satellite transmitters. One of these fish reached the northern boundary of the Sargasso Sea, the presumed reproduction site for the species, after a 2,400 km journey.

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Analysis of the data revealed that all the eels adopted similar migratory paths and patterns. Near the coastline they appear to use the salinity level and temperature to find the high seas. A single eel provided data for the ocean segment of the migration. Its transmitter showed that it turned due south upon reaching the edge of the continental shelf, and headed straight to the Sargasso Sea. In 45 days, this eel captured in the province of Quebec covered 2400 km. "This points to the existence of a navigation mechanism probably based on magnetic field detection," asserted Professor Dodson

Comment: It seems everyone uses the magnetic field. A pattern?


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