Schematic representation of the apparatus used to assess inhibitory performance in zebrafish. Aerial view (top); lateral view of the front zone (bottom)

Latency to approach the prey of (a) zebrafish and (b) guppies from the different age groups. Points represent raw data, internal lines represent medians, box edges represent the first (Q1) and third (Q3) quartiles and whiskers represent Q1 + 1.5 × the interquartile range, IQR, and Q3 + 1.5 × IQR. Bars above the boxes indicate significant differences between age groups revealed by post hoc tests

Number of capture attempts observed in (a) zebrafish and (b) guppies from the different age groups across the 10 min of observation. The points indicated means and the error bars indicated standard errors. Note that the scale differs between the two panels

Index of inhibition calculated from the change in the capture attempts of the different age groups of (a) zebrafish and (b) guppies. Points represent raw data, internal lines represent medians, box edges represent the first (Q1) and third (Q3) quartiles and whiskers represent Q1 + 1.5 × the interquartile range, IQR, and Q3 + 1.5 × IQR. Bars above the boxes indicate significant differences between age groups revealed by post hoc tests. Note that the scale differs between the two panels