ABOVE: Glass eels (Anguilla anguilla)
A. CRESCI ET AL. (2019)
Transparent European eel (Anguilla anguilla) larvae called glass eels have an internal magnetic compass that helps them migrate. After hatching, they travel from the Sargasso Sea in the middle of the Atlantic Ocean to estuaries throughout Europe, where they live for most of their adult life before returning to the Sargasso to spawn and die. Researchers wondered how eels determine what direction to swim, so they collected 222 glass eels from four estuaries flowing in different directions in Norway. Their findings were published in Communications Biology October 8.
Alessandro Cresci, a graduate student in the at University of Miami and the lead author of the study, worked in collaboration with colleagues at the Norwegian Institute of Marine Research. The scientists placed the eels into tanks with rotated magnetic fields and found that the animals swam in the magnetic direction of the ...
