Abstract
By using the water-sediment quality model (WSQM), the numerical experiments were carried out for the management of water quality in the Seto-Inland Sea. A formula roughly forecasting water quality to estimate the effect of loading abatement was proposed. According to analysis of loading abatement, it was shown that relatively large effort of abatement would be required in the eastern Seto-Inland Sea, from Bisan Seto to Osaka bay, and that not only TP but TN load abatement was also required. On the other hand, it was indicated that the increase of loading lead to increase of the primary production, while not straightly to increase of fish catchment.
