Fig. 4. Hatching profiles of two intact females (A and B) and the embryo cluster detached from each female. Top panel: hatching of the embryos attached to the female. Middle panel: hatching of the embryos detached on the day of larval release from the female. Bottom panel: hatching of the embryos detached one day before larval release. The area depicted by broken lines shows 95% hatching, while the downward arrow shows the median time in hatching distribution. The 24 h L:D cycle is shown by the horizontal bar at the top of the figure (the filled section represents the dark phase). Vertical solid lines indicate the times of light on and light off in the experimental room. N is the total number of zoeas hatched. SI, synchrony index. HW, predicted time of high tide.