Fig. 4. The scaling of coasting performance in zebrafish. (A) Video frames of a larva (orange border), juvenile (purple border) and adult (green border) illustrate the difference in size and shape of three stages. Scale bars, 2 mm. (B) The position function (Eqn 4; coloured lines) fit to measurements of body position (filled circles; down-sampled for clarity) provided measurements of the time constant, , and initial speed, U₀. Glide distance, d, was measured at the mean glide duration for all fish (broken grey line). (C) Changes in speed are drawn according to measured parameter values entered into the speed equation for each fish (Eqn 3). (D-F) The mean (filled circles) and distribution (± 1 S.D.) of kinematic parameters plotted against the body length (L) for each fish. Orange, purple and green points correspond to the same individuals shown in panels A-C.