The average percentage of fish school (n = 12) in each arm over five minutes. There is significantly less fish, on average, in the arm when magnet is present compared to when sham in present in the same arm (*** p < .0005 Mann-Whitney U Test). This is a Spear Box Plot with the box showing 25% to 75% interquartile range and median represented as a black line, whiskers show minimum and maximum values. Arm 1 Magnet: median = 8.33%, IQR = 25%; Arm 1 Sham: median = 25%, IQR = 58.77%; Arm 2 Magnet: median = 0%, IQR = 25%; Arm 2 Sham: median = 16.67%, IQR = 41.67%; Arm 3 Magnet: median = 41.67%, IQR = 33.33%; Arm 3 Sham: median = 50%, IQR = 25%.