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Figure 5 The circadian locomotor activity rhythm of medaka fish and AB strain zebrafish as the outgroup. (A) Comparison of the average speed between each tested fish species (medaka and zebrafish) during the day and night cycles. Comparisons of (B,H) average speed, (C,I) average angular velocity, (D,J) meandering, (E,K) freezing movement time ratio, (F,L) swimming movement time ratio, and (G,M) rapid movement time ratio between each tested fish species (medaka and zebrafish) in the day and night cycles, respectively. Data are presented as median with interquartile range, except for (G,M), which are presented as mean with a 95% confidence interval (CI) since some median of the data in those figures are 0. Data were analyzed by Kruskal–Wallis test continued with uncorrected Dunn’s test. Different letters (a, b, c, d, e) on the error bars represent a significant statistical difference (p < 0.05) (n = 18 for O. dancena, O. latipes, O. woworae, and D. rerio; n = 12 for O. sinensis).