Figure 6.

Comparison in total distance moved in the open field test (A), time spent in the periphery in the open field test (B), and time spent in the bottom half of the novel tank diving test between young (6 weeks, red) and old (18 weeks, blue) killifish and zebrafish (dark gray) and medaka (light gray). Killifish move a much smaller distance than zebrafish and medaka (A) and initially spend more time in the periphery than zebrafish and medaka (B). (C) Comparison of time spent in the bottom half of the novel tank diving test with zebrafish and medaka, shows that killifish spent most of their time in the bottom half of the tank, which is much more than medaka and zebrafish [zebrafish and medaka data reused from Lucon-Xiccato et al. (2022)—Creative Commons—http://creativecommons.org/licenses/by/4.0/].