Spatial Orientation Of Fish Embryos In Magnetic Field
Adam Tański, Krzysztof Formicki, Agata Korzelecka-Orkisz, Aleksander Winnicki
Department of Fish Anatomy and Embryology, Agricultural University of Szczecin, Kazimierza Królewicza 4, 71-550 Szczecin, Poland
Abstract: Orientation, i.e., spatial arrangement, of fish embryos in artificially generated (with constant magnets) 0.5; 1.0; 2.0, and 4.0 mT horizontal magnetic fields, superimposed on the geomagnetic field was compared to the orientation in the Earth’s magnetic field alone (control). In addition, effects of artificially generated 0.5 mT magnetic field superimposed on the geomagnetic field, but rotated by 90º relative to it, were followed. Fish eggs were incubated in a constant, unchanging position, until the blastomere closed, and the orientation of the embryo was determined. The embryos showed statistically significant preferences towards the N-S orientation of their axis of symmetry. In addition, the artificially generated constant magnetic fields were found to induce significantly stronger orientation responses, compared to those elicited by the geomagnetic field alone.
Key words: fish embryos, orientation in magnetic field