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The influence of seasonal variations on the chemical composition and composition of fatty acids in five commercially important freshwater fish species from the Danube: white bream, bream, vimba, zope, and Prussian carp, during May, July and September was determined. Changes in the chemical composition of meat of all examined species had the same tendencies. Water and protein content in the meat decreased, while fat content increased. The most frequent fatty acids in the meat of all the examined fish were the following: 18:1 n-9 (oleic), 16:0 (palmitic), 16:1 (palmitoleic), 18:2 n-6 (linoleic), 20:1 (eicosenoic), 20:5 n-3 eicosapentaenoic acid (EPA), 20:4 n-6 arachidonic acid and 22:6 n-3 docosahexaeonic acid (DHA). The content of saturated fatty acids (SFA) ranged from 25.03% to 32.43% and displayed a tendency to increase during the observed period. The total content of the n-6 group in the meat of Prussian carp was higher than in other species, which was probably a consequence of specific diet. The total content of n-3 fatty acids in the meat of white bream, bream, vimba and zope was the highest in May, and it declined during July-September. We can conclude that the meat of white bream and vimba contains high nutritional values in terms of EPA and DHA content. The n-3/n-6 ratio was also very favourable: 0.9 to 2.0 in the meat of white bream, bream, vimba and zope, with a clear downward tendency in the observed period.

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. [19] Šoltész A. , Baroková D. Analysis of surface and ground water interaction in the Danube River branch system , Proc. of 14th International

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Water resources management and its homeland security aspect in Hungary

Vízbiztonság mint belbiztonság Magyarországon

Scientia et Securitas
Authors:
László Balatonyi
,
Krisztina Ligetvári
,
László Tóth
, and
Ádám Berger

. 6 ICPDR (2015a) Annual Report on the Activities of the ICPDR 2014, International Commission for the Protection of the Danube River, Vienna, ICPDR, pp. 8

Open access
Pollack Periodica
Authors:
Michaela Červeňanská
,
Dana Baroková
, and
Andrej Šoltész

the northeast by the Little Danube River. It is a lowland area, which is protected by dykes against direct flooding, with relatively small depths of groundwater level below the ground. However, dykes do not exclude the possibility of bank filtration

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. [5]. Vízügyi és Környezetvédelmi Központi Igazgatóság, Duna-vízgyűjtő magyarországi része, Vízgyűjtő-gazdálkodási terv [Hungarian Central Directorate for Water and Environment, Hungarian part of the Danube River Basin, River Basin Management Plan

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Risks of agricultural water management and opportunities to reduce them in V4 countries

Mezőgazdasági vízgazdálkodás kockázatai és azok csökkentési lehetőségei a V4-ek országaiban

Scientia et Securitas
Authors:
János Tamás
,
Attila Nagy
, and
Tamás Németh

Treatment, Vol. 1. No. 2. http://dx.doi.org/10.16966/2381-5299.107 6 Guidance Document on Sustainable Agriculture in the Danube River Basin (ICPDR IKSD

Open access

Task of shipping operations control of the Gabčíkovo Project is to synchronize several requirements. These come from versatility of GAP and must meet with the following goals. The operation of GAP must be effective (maximization of the ship locks capacity, maximization of income from electricity production in hydropower plant); reliability of operation of the ship locks must not be limited or endangered by defects on technology parts of the ship locks caused by illegal parameters of water flow in the filling and emptying system; and shipping safety must not be endangered or limited by unsuitable parameters of river way (navigable depth below minimal shipping depths in ford sections caused by flow changes on Gabčíkovo Project and ships crushing into riverbed of the Danube river).

By taking these goals into account, it is possible, in general, to define operation of Gabčíkovo Project as complex multi-criteria optimization task with many technological, water management, energetic and environmental constrains. Standard approach in solving this problem includes elaboration of optimization or simulation model of Gabčíkovo Project operation. If mathematical description of problem does not exist, ‘classic’ expert control system management must be applied. Based on above stated criteria, most effective approach to this problem appears to be creating software application that combines both approaches.

In this case, expert control system of shipping operation on Gabčíkovo Project will be software application to model hydraulic links and hydraulic regimes (discharges, water levels and flow velocities) based on relevant inputs on the ship locks and whole section of the Danube river, that is affected by Gabčíkovo Project operation.

The paper describes possible optimization solution for achieving above mentioned goals. Architecture of proposed expert control system is described in the paper and the focus is mainly on analyzing suitability of heuristic optimization methods for solving above the stated optimization problems.

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Danube River’s water level on the gravity gradient, Student reserach paper , 2010. Cerovský I., Meurers B., Pohánka V., Frisch W., Goga B. Gravity and magnetic 3D modeling software — Mod3D, in Meurers, B. and Pail, R. (eds

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Danube River , 2nd International Conference on Fluvial Hydraulics, River Flow 2004 , Naples, Italy , 23–25 June 2004 , pp. 135 – 142 . [11] Russ J. C

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. , Tanos P. , Trásy B. , Várbíró G. Developments in water quality monitoring and management in large river catchments using the Danube River as an example , Environmental Science & Policy , Vol. 64 , 2016 , pp. 141 – 154

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