Fig. 5. Cyclic swimming in zebrafish larvae. Contours of the specific lateral displacement (left column) and specific curvature (right column) of the midlines of swimming larvae. Age post-fertilisation: A,E – 2 days; B,F – age 3 days; C,G – 5 days: D,H – 7 days. The contours are based on the same sequences as Fig. 2A,C,D,E. The thick, black lines indicate zero lateral displacement (h₀; A–D) and zero curvature (₀; E–H), respectively. Broken, black lines indicate the local extremes in the lateral displacement (h_max; A–D) and curvature (_max; E–H). The horizontal cross sections (red lines) indicate instantaneous body waves (A–D) and curvature waves (E–H). For further explanation, see main text and Fig. 4.