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This study analyses settlement process of megalopa, which is final stage of crab larva, on a tidal lagoon based on population sampling of juvenile crabs and numerical simulation. According to population sampling, the observed results indicated many megalopae have settled down at around points of 0.2 meters elevation. Then, to grasp the relationship between megaloal settlement and flow field, numerical tracer chasing by 2-D Lagrangian model was conducted. This study brought up tractive force as settlement parameter of tracer. By comparison the distribution, the calculated result with considering tractive force agreed with the observed result. Additionally, spatial distribution of juveniles could change under the complicated flow filed caused by tidal and wind conditions.

Effect of Water Flow on Megalopal Settlement in Nagura Amparu Tidal Lagoon, Ishigaki Island, Okinawa