First evidence of fish sensing geomagnetic fields from a Czech Christmas market.
Christmas carp at Czech markets suggest fish geomagnetic sensing capabilities
Carp stored in large tubs at Czech Christmas markets align themselves in the north-south direction, suggesting they possess a previously unknown capacity to perceive geomagnetic fields, according to a new study published December 5 in the open access journal PLOS ONE, led Hynek Burda from the University of Life Sciences (Prague), Czech Republic and colleagues from other institutions.
The authors photographed and analyzed the positions of fish in the traditional Czech Christmas market, where carp are stored live in large tubs prior to being sold for the holiday feast.
The fish were accustomed to human onlookers, and street lights and other potential disturbances seemed to have no effect on the orientation of the fish.
In the absence of other common stimuli for orientation like light, sound or the flow of water, the authors suggest that the fish most likely align themselves to geomagnetic cues.
(Source:Eurekalert) Citation: Hart V, Kusˇta T, Neˇmec P, Bla´hova´ V, Jezˇek M, et al. (2012) Magnetic Alignment in Carps: Evidence from the Czech Christmas Fish Market. PLoS ONE 7(12):e51100. doi:10.1371/journal.pone.0051100