Results of monitoring carried out in the coastal zone between Kuznica and Gorki Wschodnie (down to 20 m depth) in autumn 1994 and summer 1995 are presented. These investigations were a continuation of measurements taken in the areas of Hel and Krynica Morska in summer 1992 (down to the 60 m depth). The state and directions of seasonal and multi-annual changes of chemical, micro-biological and biological properties of the water and sediment environment of the Gulf's coastal zone are discussed. The results of presented investigations and of experimental research carried out in the Gulf of Gdansk environment were the basis for the development of a system for protection and regeneration of the biocenosis of the Gulf.