The Park National of El-Kala wetland complex is very varied ecosystems; classified as a world protected sites through a renowned international wetland complex. This work was conducted in Northeastern Algeria to study the physicochemical parameters and to determine trophic levels in three water bodies of the Park National of El-Kala wetland complex from January to December 2017. The relationships between phytoplankton density, the main environmental parameters (temperature, salinity, nutrients) and characterization of trophic status based on the references of the Chlorophyll levels were investigated. The monthly fluctuations of the physicochemical parameters of the water showed variations following the seasonal rhythm and are strongly dependent on abiotic factors in the region. The results of the statistical analysis revealed significant correlations between phytoplankton densities and nutrient concentrations and also Chlorophyll concentration. In conclusion, it was found hyper eutrophication status during the summer period as well as the autumnal period in all studied sites [Chla] > 25 µg/l. By contrast, Mellah lagoon is mesotrophic in winter ([Chla] =7.69 µg/l).