Qualitative and quantitative considerations of phytoplankton and zooplankton, in the first sector of maritime Danube, Cotu Pisicii - Gropeni.

Abstract. Given the importance of phytoplankton and zooplankton (Bud et al., 2004), assigned to two groups of organisms, the role of an essential component of aquatic ecosystem, these being the main source of oxygen and biomass. Our aim was to evaluate in terms of quality and quantity the plankton of the Danube, in Cotu Pisicii–Gropeni sector. For this we have proposed the following objectives: plankton harvesting in two differents points (station 1 GalaŃi, respectively station 2 Brăila); quantitative assessment of collected plankton; plankton preservation using the establish techniques; qualitative analysis of plankton in the laboratory by determining the species and their share of total; dissemination of the results.