Istituto Nazionale di Fisica Nucleare (INFN) 1 article published in JoVE Behavior Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish Alessandro Cresci1, Rosario De Rosa2,3, Claudio Agnisola4 1Rosenstiel School of Marine and Atmospheric Science, Department of Ocean Sciences, University of Miami, 2Department of Physics, Monte S. Angelo (MSA) Campus, University of Naples Federico II, 3Istituto Nazionale di Fisica Nucleare (INFN), 4Department of Biology, MSA Campus, University of Naples Federico II We describe a behavioral protocol designed to assess how zebrafish’s personalities influence their response to water currents and weak magnetic fields. Fishes with the same personalities are separated based on their explorative behavior. Then, their rheotactic orientation behavior in a swimming tunnel with a low flow rate and under different magnetic conditions is observed.