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Varna, Bulgaria

Dineva S.,Institute of Fish Resources
Bulgarian Journal of Agricultural Science | Year: 2015

In terms of water resources, important concern and one of the challenging issues will continue to be reliable seawater for a growing population, development of coastal infrastructure, and associated social and environmental activities. As the Varna Bay and the Black Sea coastal area near to Cape Galata contribute greatly to the well-being of a large number of people, in 2013, in response to social and environmental concerns, hydrological and hydrochemical research was fulfilled. This investigation promotes protection and development of the Varna Black Sea region for years to come and to be met various demands. Varna region’s seawater protection has to encompass also effective policies and management practices so that the impacts of rapid urbanization can be managed better and sustainable development for all to be achieved. © 2015, National Centre for Agrarian Sciences. All rights reserved.


Dineva S.,Institute of Fish Resources
Bulgarian Journal of Agricultural Science | Year: 2015

Lake water to fulfill vital ecosystem functions and to serve human needs is of great importance. Study of the long-term evolution of the Beloslav and the Varna lakes’ water environment has become increasingly challenging because of the significance both for a wide range of environmental and social activities and for a multi-sectoral concern. Monthly and seasonal research approach was applied to long-term investigations of key lake water characteristics that matter to broader issues like environmental protection, public and private regional business development, and stakeholder collaborations. The challenges related to the Beloslav and the Varna lakes imply environmental, social, and economic aspects to be taken into consideration that would result in more effective regulations, incentives, instruments, and investment plans in the region. © 2015, National Centre for Agrarian Sciences. All rights reserved.


Uzunova S.,Institute of Fish Resources
Bulgarian Journal of Agricultural Science | Year: 2015

In 2006, 2011 and 2013 benthic macrofauna investigations were carried out in the region between Cape Kaliakra and Cape Galata, situated at 1 mile distance in front of the Bulgarian Black Sea coast and two stations in Varna Bay, so that to reveal the present situation with the benthic communities in the studied area in 2013, compared to 2006 and 2011. The results show strong increase in abundance of benthic macrofauna from 2006 to 2013 and reverse trend for the biomass values. Similar results were established for the period 1998-2002, which prove that situation within benthic community is still very unstable. Trend of decrease in mollusk’s share in species composition and increase of polychete number was found in 2013. Shannon - Wiener index shows improvement of the state of benthic communities in the investigated area. Values of Marine Biotic Index (AMBI) and multivariate AMBI (M-AMBI) are in conformity with Shannon-Wiener index and confirm the relatively good state of the ecosystem in the investigated area. © 2015, National Centre for Agrarian Sciences. All rights reserved.


Dineva S.,Institute of Fish Resources
Bulgarian Journal of Agricultural Science | Year: 2013

The world is heating up and assessment of the magnitude of temperature increases refers to the Earth's seas and oceans. The seas and oceans act as a giant rechargeable battery for the Earth. It takes a lot of energy and time to change sea temperature so that seas and oceans can be called the 'memory' of the Earth's climate system. The Black Sea in front of the Bulgarian coast becomes climate change affected area. Research in the 30-mile Black Sea zone in front of the Bulgarian coast, down to 100-m isobaths was done, with aim climate-driven changes to be established. In-situ measurements of temperature, salinity, oxygen and oxygen saturation were done. Processing of samples for nutrients was performed via unified methods for marine waters. Climate-driven transformation of the thermo-haline structure was ascertained. Because of warming, the Black Sea Cold Intermediate Layer in front of the Bulgarian coast was warmer in the frame of isotherms of 8 °C, with greatly elevated bottom border. Salinity was above the long-term average throughout the 100 m investigated layer. The greatly elevated Cold Intermediate Layer bottom border brought about rise of high-salinity deep waters. Owing to crucially reduced fresh water inputs, extremely low were the concentrations of nutrients. The organic nitrogen share was dominating at total nitrogen formation in the open-sea.


Tserkova F.,Institute of Fish Resources
Bulgarian Journal of Agricultural Science | Year: 2013

The goal of the present paper is to define some basic characteristics of the population of Black Sea sprat (Sprattus sprattus L.) along the Bulgarian cost such as size and age composition, performance and character growth, relationship between weight and length and index of Fulton. It was found that the growth in the period 2010-2012 is alometric. The values of the parameter n, characterizing the relationship between growth in weight and length, were ranging from 1.475 to 3.074. It was found that in autumn - winter season, the Fulton's index was decreasing and in the spring- summer it was increasing The parameters in the equation of Von Bertalanffy, estimated by the lengths of the periods from April to October 2011 and November 2011 - March 2012 were as follows: Lt = 12.68 {1 - exp [- 0.138 (t + 4.283)]} and Lt = 13.68 {1 - exp [- 0.267 (t + 1.975)]}.

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