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Title: INFLUENCE OF THE ANTHROPOGENIC PRESSURE ON VARNA AND BELOSLAV LAKES AND THEIR ICHTHYOFAUNA
INFLUENCE OF THE ANTHROPOGENIC PRESSURE ON VARNA AND BELOSLAV LAKES AND THEIR ICHTHYOFAUNA

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Radoslava Bekova; Bogdan Prodanov; Todor Lambev
10.5593/sgem2022/5.1/s20.032
10.5593/sgem2022/5.1
1314-2704
978-619-7603-46-0
English
22
5.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Ecology and Environmental Protection
The Varna and Beloslav lakes are the most strongly anthropogenized water bodies along the Bulgarian coast. At present, the lakes are again subject to deepening of the navigable channel, which significantly changes the quality of the habitats. An ecosystem approach was used to assess the status of the populations of fish species from the Varna-Beloslav Lake Complex. The paper's main purpose is to provide up-to-date information on the ichthyofauna of the largest northern Bulgarian Black sea brackish water bodies – Varna and Beloslav Lakes, the influence of the anthropogenic factor and its consequences.. The article includes data from mass kill fish and changes in physicochemical parameters in the period 2019 - 2021, compared to the previous periods, and identifies the main species affected by anthropogenic pressure. The data show that the mass death of fish includes small age groups and size classes. The anthropogenic pressure analysis shows that many fish species inhabiting the two lakes have lost their natural habitats.
[1] Georgiev Z. Species composition of the ichthyofauna of the Bulgarian Black Sea lakes. Proceedings of the Research Institute of Fisheries and Oceanology – Varna, Vol. VIII, pp. 211 – 227, 1967.
[2] Karapetkova, M., M. Zhivkov. The fish in Bulgaria. Gaia Libris, Sofia, 92 p., 2006.
[3] Lambev, T., Prodanov, B., Dimitrov, L., Kotsev, I.. Digital terrain model of the Varna and Beloslav Lakes, North Bulgarian Black Sea Coast. In Eighth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2020), Vol. 11524, pp. 740-747, 2020.
[3] Chugunova, N. Guidance for studying the age and growth of fish. ANSSR, Moscow, 156 p, 1959.
[4] Act № Н-4/14 September 2012
[5] NATURA 2000 „Mapping of conservation status and habitats - Phase 1“ - http://natura2000.moew.government.bg/Home/Map
[6] Regional report on the state of the environment in 2020. Ministry оf Environment And Water. Regional Inspectorate of Environment and Water. Varna, p. 188. 2020.
The study was realized with the financial support of the National Scientific Fund of Bulgaria through a project entitled: „Influence of the climate changes and the increasing anthropogenic pressure on the ichthyofauna in the brackish (transitional) waters along the Bulgarian Black Sea coast“, № КП-06-М41/2 / 27.11.2020.
conference
https://doi.org/10.5593/sgem2022/5.1/s20.032
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Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022
22nd International Multidisciplinary Scientific GeoConference SGEM 2022, 04 - 10 July, 2022
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
249-256
04 - 10 July, 2022
website
8696
anthropogenic pressure, mass kill fish, bathymetry, Varna Lake, Beloslav Lake, Northern Bulgarian Black Sea coastal sector