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Dispersion mechanism of hatchlings of horseshoe crab Tachypleus tridentatus at tidal flat off the Yasaka Rivermouth in Moriye Bay in Oita Prefecture was investigated by field observations of tidal currents and numerical simulation. Hatchlings of horseshoe crab creep out of the sea bottom of the spawning site between two hours before and after the high tide. Field observation of tidal currents on and off the tidal flat and Lagrangian analysis of neutral floats modeled hatchlings show that hatchlings can reach tidal flat, where larva horseshoe crabs live, by the dispersion effect of tidal currents in spite of their low swimming capability. This well explained observed results.

DISPERSION MECHANISM OF HATCHLINGS OF HORSESHOE CRAB TACHYPLEUS TRID ENTATUS AT TIDAL FLAT OFF THE YASAKA RIVERMOUTH IN MORIYE BAY