Fig. 5

a, b For all possible mean body angles (0°- 360°): a all treatment groups of fish show similar density, or total spatial use, of the arena under no flow conditions; b however, the controls (control, n = 248 fish) used the front of the arena and the lateral-line lesioned fish (CuSO4, n = 204 fish; neomycin, n = 222 fish; 18 experimental sessions) used the back of the arena under flow. c, d Filtering the data for mean body angles required for rheotaxis (0° ± 45°): c all groups clustered along the left and right sides of the arena under no flow; d but under flow, the controls used the front-left and the lesioned use the back-right portions of the arena. Dotted lines and labels in capital letters indicate spatial regions of interest (ROI). For clarity, statistical comparisons among treatment and ROIs were not included in the figure; however, there were significant fixed effects for CuSO4 and neomycin treatments, the back ROI, and interactions between treatment and ROI (Supplementary Table 8).