Abstract
In the context of climate change observed in recent decades and taking into account the Danube input from the northern part of Romanian Black Sea waters, a research survey was conducted in order to obtain data regarding the ichthyofauna structure. During the survey conducted with the research vessel “Steaua de Mare 1” in 2019, 20 pelagic hauls and 4 fishing stations with gillnets of different mesh sizes were carried out. In pelagic trawling, 20 fish species have been identified, the dominant species being sprat (Sprattus sprattus) and whiting (Merlangius merlangus euxinus). In gillnet experimental fishing, 16 species were identified, Caspian shad (Alosa tanaica) and Danube shad (Alosa immaculata) being dominant. Also, in order to estimate the ichthyofauna biological diversity, the Margalef Index was calculated, values between 3.07-6.15 being recorded, indicating a high species diversity in the studied area.
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