Adina Popescu

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THE ASSESSMENT OF AQUATIC ECOSYSTEM MALINA, THROUGH PHYTOPLANKTON'S SAPROBITY INDEX

Adina Popescu, Daniela Ibanescu, Maria Fetecau

Abstract
This paper presents information about water quality classification for establishing the organic status in Malina fish farm, Galati county. The quality of water in the sample stations was evaluated on the basis of phytoplankton through saprobic index. The analysis of biological samples was achieved with the help of a stereomicroscope, using a rich special literature. The phytoplankton was present in all the samples from the sampling stations. The phytoplankton saprobic index calculated for each sampling station, has values between 1,98 and 2.11. From the quantitative point of view, the dominant species are β-mesosaprobe with values of numerical density and numerical abundance between 39520-ex 697528/l, respectively 91,78-98,82%. According to the upgrade of the 161/2006 these values indicate a good ecological status of the water that fits the second class of quality, the water being suitable for the growth and development of the Fisheries natural fund.

Key words: zooplankton, species, density, abundance, biomass