The paper provides hydrodynamic interpretation of the remote altimeter and biotic measurements; detects the patterns of spatial-temporary variability in PP-fields; describes and compares dynamical and biotical fronts of the Japan Sea. The dependence between year-averaged biotical and dynamical fronts is shown to be unstable. More close relation between these fronts may be observed in central sea during the monsoon circulation change, as well in the western shelf part influenced by Primorskoe and North-Korean currents.