Figure 2. Naive preference for light/dark zones with and without a black floor.

(A) When a black floor was used, zebrafish spent more time in the dark zone (186.9±11.16 sec, n = 20) compared to the light zone (113.1±11.16 sec, n = 20). (B) With a white floor, the fish also spent more time in the dark zone (207.8±15.37 sec, n = 12) compared to the light zone (92.22±15.37 sec, n = 12). ***p<0.001, paired t-test.