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The dispersion process of hatchlings of horseshoe crabTachypleus tridentatusat tidal flat off the Yasaka Rivermouth in Moriye Bay in Oita Prefecture was investigated by field observation and numerical simulation under the past condition without large-scale structures. Hatchlings of horseshoe crab creep out of the sea bottom of the spawning site between two hours before and after the high tide. Lagrangian analysis of neutral floats show that hatchlings can spread over the tidal flat, where larva horseshoe crabs live, by the dispersion effect of tidal currents in spite of low swimming capability. Dispersion capability is large off the mouth of large rivers.

REPRODUCTION OF DISPERSION PROCESS OF ENDANGERED HORSESHOE CRAB LARVAE IN PAST TOPOGRAPHIC CONDITION AND CONSERVATION OF HABITAT