Fig. 7. Relationships between tidal height and the timing of hatch induction of Periophthalmus modestus. The horizontal grey bar represents heights of mudflat surface in which openings of P. modestus burrows were located. Different curves show changes in tidal height during the last tidal cycles of egg incubation periods determined for 11 burrows. Curves are adjusted to the peaks of flood tide (time zero). The rectangle encloses the curves for an approximate range in which hatch induction occurred.