scholarly journals Comparative Diplectanum aequans (Monogenea) infestations in cultured European seabass (Dicentrarchus labrax) in the Black Sea and the Aegean Sea

2019 ◽  
Vol 36 (2) ◽  
pp. 163-169
Author(s):  
Ahmet Özer ◽  
Sevilay Okkay ◽  
Türkay Öztürk ◽  
Birol Baki ◽  
Gökçe Acar ◽  
...  
Keyword(s):  
Black Sea ◽  
Average Length ◽  
Dicentrarchus Labrax ◽  
Aegean Sea ◽  
The Black Sea ◽  
Homogeneous Distribution ◽  
Mean Intensity ◽  
European Seabass ◽  
Significant Difference ◽  
The Difference

In the present study, monogenean infestations were investigated on the gills of the European seabass Dicentrarchus labrax grown in culture cages located at Yakakent coast of the Black Sea and Milas coast of the Aegean Sea. Parasitological investigations were conducted simultaneously at both localities during September 2014, February and April 2015. While a total of 100 fish specimens were examined from Yakakent samples whose average length was 19.37 cm, a total of 88 fish specimens were examined from Milas samples whose length was 22.67 cm in average. Only one monogenean species Diplectanum aequans was recovered from investigated fish specimens at both sampling localities. Infestation prevalence (%) and mean intensity values of D. aequans were 89.0% and 9.6 ± 0.8 in Yakakent samples while those infestation indices were 90.9% and 13.3 ± 1.2 in Milas samples, respectively. The difference between the infestation prevalence (%) values of D. aequans at both sampling localities was not statistically significant, on the other hand, the difference was statistically significant in the mean intensity values at both locations. Diplectanum aequans showed a homogeneous distribution in all gill arches of fish without any statistically significant difference. This is the first comparative study on the infestation of D. aequans on the gills of European sea bass D. labrax cultured in the Black Sea and the Aegean Sea.

scholarly journals Comparative fatty acıd composıtıon of European seabass Dıcentrarchus labrax (Linnaeus, 1758) durıng theır growth perıod ın dıfferent productıon regıons ın the Aegean Sea and the Black Sea coast of Turkey

2019 ◽  
Vol 66 (2) ◽  
Author(s):  
Birol Baki ◽  
Dilara Kaya Ozturk ◽  
Murat Kerim
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Black Sea ◽  
Dicentrarchus Labrax ◽  
Aegean Sea ◽  
The Black Sea ◽  
Black Sea Region ◽  
European Seabass ◽  
Fish Samples

The aim of this study was to analyse the fatty acid composition of European seabass Dicentrarchus labrax (Linnaeus, 1758), farmed in marine cages in the Aegean Sea and in the Black Sea coasts of Turkey. The study was conducted between June 2014 and September 2015 using the same feed in all the cage farms. Fish samples representing the stock were collected at regular intervals and morphometric measurements were taken in the laboratory. Fatty acid analyses were carried out by gas chromatography. Biochemical composition of harvested European seabass indicated high dry matter and crude fat values in the Black Sea region and high crude protein and crude ash values in the Aegean region. Significant regional differences between fatty acid composition (p<0.05) was observed, despite being fed with the same diets.

CORRELATION OF THE BLACK, MARMARA AND AEGEAN SEAS DURING THE HOLOCENE

2017 ◽  
Author(s):  
Nikolay Esin ◽  
Nikolay Esin ◽  
Vladimir Ocherednik ◽  
Vladimir Ocherednik
Keyword(s):  
Mathematical Model ◽  
Sea Level ◽  
Black Sea ◽  
Aegean Sea ◽  
The Black Sea ◽  
Sea Level Changes ◽  
The Holocene

A mathematical model describing the change in the Black Sea level depending on the Aegean Sea level changes is presented in the article. Calculations have shown that the level of the Black Sea has been repeating the course of the Aegean Sea level for the last at least 6,000 years. And the level of the Black Sea above the Aegean Sea level in the tens of centimeters for this period of time.

A voyage to Ancient Greek Harbours on board Limenoscope

2007 ◽  
Vol 7 (1) ◽  
pp. 253-260 ◽  
Author(s):  
T. Theodoulou ◽  
C. Memos
Keyword(s):  
Black Sea ◽  
General Public ◽  
Aegean Sea ◽  
Relevant Information ◽  
The Black Sea ◽  
Ancient Greek ◽  
Web Based ◽  
Database Structure ◽  
Historical Role ◽  
Concise Information

Limenoscope is a web based database aiming at promoting the cultural heritage regarding ancient Greek harbours and disseminate the relevant information equally to the general public and to researchers with an interest in that particular cognitive field. The scope of the project is the realization of a database, where one can search for concise information relevant to the historical role, the topography, the morphology, as well as the technical works and installations of ancient harbours in the Mediterranean and the Black Sea. The Database started off with the registration of harbours located in the Aegean Sea and Cyprus, dating from Archaic to Byzantine times. Special emphasis is laid on the bibliographical update of the data forms of the harbour sites, as well as on the related references in ancient literature. The database enables the locating of these sites on a general map, where photographs, plans etc. are also archived. The principles of the database structure are briefly presented along with an example, that of the harbour of Phalasarna, among the harbours registered therein.

scholarly journals Aeromonas veronii Infection Associated with High Morbidity and Mortality in Farmed European Seabass Dicentrarchus labrax in the Aegean Sea, Greece

2017 ◽  
Vol 52 (2) ◽  
pp. 68-81 ◽  
Author(s):  
Maria Smyrli ◽  
Athanasios Prapas ◽  
George Rigos ◽  
Constantina Kokkari ◽  
Michail Pavlidis ◽  
...  
Keyword(s):  
Dicentrarchus Labrax ◽  
Aegean Sea ◽  
Morbidity And Mortality ◽  
High Morbidity ◽  
Aeromonas Veronii ◽  
European Seabass

scholarly journals Modern state of the reproductive potential of Black Sea sprat Sprattus sprattus phalericus (Risso, 1826) (Pisces: Clupeidae) in Crimean region and conditions for its formation

2019 ◽  
Vol 4 (4) ◽  
pp. 3-14
Author(s):  
G. V. Zuyev
Keyword(s):  
Black Sea ◽  
Average Length ◽  
Reproductive Potential ◽  
Danube River ◽  
The Black Sea ◽  
Total Catch ◽  
Sprattus Sprattus ◽  
The Absolute ◽  
Individual Fecundity

Black Sea sprat Sprattus sprattus phalericus (Risso, 1826) is one of the abundant species of fish in the Sea of Azov – Black Sea basin. Due to its large number sprat plays an extremely important role in the ecosystem of the sea, being an intermediate link between zooplankton and representatives of the highest trophic level – large predatory fish, dolphins, and birds. At the same time sprat is one of the important commercial fish in all the Black Sea countries, steadily being on the second place of catch volume in recent decades (after anchovy). The total catch reaches 100 thousand tons. Turkey and Ukraine are the main producing countries. Monitoring and forecast of biological state of sprat population with rising fishing intensity and climate changes are urgent tasks. The research subject of this article is the long-term (2000–2016) dynamics of biological (qualitative) parameters determining the population fecundity of Black Sea sprat in Crimean region, the current state of reproductive potential, and the conditions for its formation. The article is based on the results of own research. Parameters determining the population fecundity – the length-age structure of the spawning part population, the absolute individual fecundity, and the sex structure population (ratio between females and males) – were studied. In the long-term plan (in 2011–2016 compared with 2000–2004) the average length of spawning females decreased by 1.22 times (from 7.36 to 6.03 cm). It was accompanied by a decrease in the absolute individual fecundity by 2.39 times (from 13 625 to 5690 eggs). The numerical ratio between females and males decreased by 1.23 times (from 1.95 to 1.59). Simultaneously the sprat stock in the northern part of the Black Sea was reduced by more than 2.5 times (from > 500 thousand tons to < 200 thousand tons). As a result, the population fecundity of sprat in Crimean region decreased by more than 7 times (2.39 × 1.23 × 2.5). The conditions of sprat fishing in the northern part of the Black Sea (from the mouth of the Danube River to the Kerch Strait) were studied. They showed 2-fold decrease (from 251.9 thousand tons in 2000–2004 to 129.1 thousand tons in 2011–2016) in the total catch and more than 2.3-fold decrease (from 50.4 to 21.4 thousand tons) in average annual catch in this region. On the contrary, in the Crimean shelf the total catch at that time increased by 1.2 times (from 76.9 to 92.2 thousand tons), and its average annual value remained constant (15.4 thousand tons). While reducing the stock by 2.5 times, this means that the fishing pressure on the Crimean population increased 2.5 times. This fact suggests considering the factor of fishing as the main cause of its degradation. Validity of this version is confirmed by the fact of conjugacy (inverse connection) of interannual fluctuations between the catch and the length-age parameters of sprat in Crimean region in 2003–2013 previously found: catches over 15–16 thousand tons were accompanied by a next year decrease in the fish average length. Regulation of fishing is a necessary condition for preventing further degradation, for restoring and maintaining sustainable state of sprat population in Crimean region and its reproductive potential. The negative impact of natural (climatic and trophic) factors on the state of the population should be recognized as a secondary one. Local overfishing indicates indirectly the structuring of the commercial stock of Black Sea sprat, its division into a number of geographical aggregations (stock units), i. e. the presence of intraspecific differentiation.

ARYENS ET SÉMITES: QUEL AVENIR? ARCHÉOLOGIES, LANGUES ET VISIONS DU MONDE

Numen ◽  
2003 ◽  
Vol 50 (2) ◽  
pp. 172-189
Author(s):  
Paul-Louis Van Berg
Keyword(s):  
Black Sea ◽  
Human Body ◽  
The Black Sea ◽  
Human Beings ◽  
The Caucasus ◽  
Linguistic Communication ◽  
Near Eastern ◽  
Eastern Cultures ◽  
The Difference ◽  
North And South

AbstractFriedrich Max Mueller thought that the "absurdity" of Aryan myths could be explained by a "disease of language," that is a shift implying that metaphor was taken for reality. Thus, cosmic and meteorological phenomena came to be considered as human beings living human adventures. He found the etiology of this disease in language, and specially in the polysemy and ambiguity of Vedic Sanskrit which he opposed to the limpidity of Hebrew. While the difference between the two languages does exist, the explanation has long been acknowledged to be false. Actually, the opposition becomes understandable if we consider that Indo-Europeans and Semites belong to much wider cultural basins. Indeed, characteristics attributed by Max Mueller to the Aryans also belong to the Altaic cultures, while those assigned to the Semites are shared not only by Hebrews, but also by many other Semitic and by non-Semitic cultures of the Near East. Hence, we can define two large cultural sets north and south of the Black Sea and the Caucasus. In the northern one, Indo-European and Altaic cultures share many traits: organization of space and time, society and knowledge, unreliability of the visible world, conception of the human body, rejection of figuration, for instance. In the southern one, we find radically different conceptions shared by the indigenous Near Eastern cultures. Considering that linguistic communication and ways of thinking are only aspects of these two cultural sets, elaborated separately since the Neolithic and adapted to different conditions of life, we may expect mythologies to reflect these differences and understand that the opposition of Vedic Sanskrit and Hebrew is only a small facet of a global phenomenon.

scholarly journals IX. Observations on the currents and undercurrents of the Dardanelles and Bosphorus, made by Commander J. L. Wharton, of H. M. Surveying-Ship 'Shearwater,' between the months of June and October, 1872. From a report of that officer to the hydrographer of the admiralty. Communicated by Admiralty

1873 ◽  
Vol 21 (139-147) ◽  
pp. 387-393
Keyword(s):  
Black Sea ◽  
Sea Water ◽  
Large Rivers ◽  
The Black Sea ◽  
General Flow ◽  
The Mediterranean ◽  
The Difference

There is a general flow of the Black-Sea water through the Bosphorus, Marmara, and Dardanelles to the Mediterranean, probably caused by the combination of three things:—first, the prevalence of N. E. winds in the Black Sea; secondly, the excess of water received from the large rivers over the amount lost by temperature at some seasons; and, thirdly, the difference of specific gravities in the two seas. Of these, observation goes to prove that the wind has by far the greatest influence.

scholarly journals Heterotrophic bacterial growth and substrate utilization in the oligotrophic Eastern Mediterranean (Aegean Sea)

2003 ◽  
Vol 4 (1) ◽  
pp. 23 ◽  
Author(s):  
U. CHRISTAKI ◽  
F.V. WAMBEKE ◽  
M. BIANCHI
Keyword(s):  
Amino Acids ◽  
Black Sea ◽  
Bacterial Growth ◽  
Bacterial Production ◽  
Sea Water ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Substrate Utilization ◽  
The Black Sea ◽  
Respiration Rates

Heterotrophic bacterial growth and substrate utilization were studied in March and September of 1997 in the oligotrophic Aegean Sea. Maximum velocities of ectoproteolytic activity (ectoaminopeptidase ctivity, EAP), as well as amino acid assimilation and respiration rates (AA-A, AA-R) were measured along with bacterial production (protein synthesis). At the northern stations which are influenced by the input of the Black Sea waters, rates at 5 m depth of EAP, AA-A and bacterial production were 2 to 3 times higher than at southern stations. Influenced by the Black Sea water, mean bacterial numbers in the 0-100 m layer showed typical oceanic concentrations averaging 0.7 x 10 6 cells ml -1 . These values, along with low bacterial production rates (30 ng C l -1 h -1 ) implied slow growth for bacteria and/or that a large number among them were inactive. Neither bacterial abundance nor production were correlated with primary production. The percentage of amino acids respired was higher in September compared to March, particularly in the northern Aegean (mean 69 %). The enzyme kinetic analysis showed a biphasic model, the transition between the high and low affinity enzymes being obtained at 50 ΜM. Ectoaminopeptidase activity was weakly correlated with bacterial production (p < 0.05), but strongly correlated with respiration rates of amino acids (p < 0.001), suggesting that the substrate used was devoted to maintain energy requirements.

Sign in / Sign up

Export Citation Format

Share Document