In the lower part of the Prut River, from the confluence with its tributary, the Elan river from the right side, to the confluence with the Danube river, on both sides of the Prut river, in the mirror, there are protected areas at national, european and world level. Thus, on the Romanian side was established in 2005, at the national level, the Natural Park of the Lower Prut Floodplain, with an area of 8247 ha, and at the European level it was designated in 2008 year, ROSCI 0105 Lower Prut Floodplain with an area of 5,852 and ROSPA0070 Prut-Vlădeşti-Frumuşiţa Floodplain with an area of 14600 ha.These two sites overlap mostly with the Natural Park of the Lower Prut Floodplain. On the moldavian side, from July 2018, Biosphere Reserve Prutul de Jos has been set up, with an area of almost 15,000 hectares, of which two thirds are occupied by Lake Beleu.On the basis of the expeditions on the Romanian side, carried out between August and November 2018, the presence, frequency, abundance of the 9 fish community importance species, present in the ROSCI0105 was evaluated by the structure survey method among commercial and amateur fishermen. These species are: Aspius aspius, Misgurnus fossilis, Cobitis taenia, Pelecus cultratus, Rhodeus sericeus amarus, Zingel streber, Zingel zingel, Gobio kessleri, Gymnocephalus schraetzer. Acknowledgement: The study was performed within the project with code BSB165– HYDROECONEX.