抄録
Transport of blown sole (Pleuronectes herzensteini) eggs and larvae from the spawning ground near Sado
Strait, Sea of Japan is simulated using a numerical model to evaluate the effect of daily wind variation on the
larval retention rate, which indicates the percentage of eggs and larvae retained in the shelf area shallower than
100m. Observed winds in March (main spawning period) of three years (1983, 1984 and 1996) and a current
profile observed by ADCP at the entrance of Sado Strait are used as driving forces. The vertical movement of
eggs and larvae estimated from field observations is also considered in the model. One hundred eggs are produced
every 5 days and tracked for the planktonic period (30 days) using a drifter advection/dispersion model based on
the water circulation calculated by a three-dimensional hydrodynamical model.
In 4 cases out of 21, the retention rates are over 30%. They have a similar wind condition that weak wind
continues for several days after spawning. Therefore short-term wind fluctuation could have a great effect on the
retention rate. From the simulation results under the modeled wind condition, it is revealed that the strong wind
blow during 9- 14 days after spawning increases the retention rate, while that during the other days decreases it.
