lSAMU y AMAZI Seto Marine Biological Laboratory, Sirahama and TAIRA HORIBAT A Taizi Middle School, Taizi, Wakayama-ken With Plates XXI-XXII and 12 Text-figures With the object of studying the stability and the seasonal succession of plankton in inlet waters, the routine works have been started since July, 1951 and are now going on in bays of Taizi, Moriura and Tanabe along Kii Peninsula. In these works our special attention was paid to the following points: (1) How the plankton communities

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... r regionally from the innermost part of the i11let to the open sea being influenced by topographical and hydrographical conditions, (2) the relation between the predominance of oceanic or neritic plankton and the movements of water masses, and (3) the correlation between the fishery and the hydrological environment, of which the physical and chemical factors were referred to together with the plankton as the synthetic indicator. The last point has a concern in the fishery of yellowtail