scholarly journals Oyster farms are the main spawning grounds of the black sea bream Acanthopagrus schlegelii in Hiroshima Bay, Japan

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11475
Author(s):  
Kentaro Kawai ◽  
Hiroki Fujita ◽  
Gustavo Sanchez ◽  
Tetsuya Umino
Keyword(s):  
Black Sea ◽  
Food Sources ◽  
Sea Bream ◽  
The Black Sea ◽  
Spawning Grounds ◽  
Acanthopagrus Schlegelii ◽  
Low Salinity ◽  
Spawning Aggregations ◽  
Oyster Farms ◽  
The Impact

Understanding the anthropogenic impact of oyster farms is essential for the management and conservation of marine fishes. In Japan, Hiroshima Bay is the region with the most intense oyster farming and thus suitable to study the impact of these farms. Here, we surveyed spherical planktonic eggs of the black sea bream Acanthopagrus schlegelii, one of the most abundant fish in the Bay. Our survey was performed at fourteen stations which included places with oyster farms and historical spawning grounds. We found the highest egg densities in four stations, one with historical spawning aggregations and three with major oyster farms. Besides, surveys at the innermost part of Hiroshima Bay, where two major rivers discharge, showed a low density of eggs indicating that black sea bream avoids spawning in low salinity areas. Our study suggests that oyster farms benefit spawners of black sea bream by providing more food sources than historical spawning grounds for efficient spawning. Yet, whether oyster farms represent a full advantage for the species remains unclear, particularly because they are known to host jellyfishes that prey on eggs and limit water flow that can influence the survival of fish eggs.

Infestation of the Parasitic Isopod Mothocya parvostis on Juveniles of the Black Sea Bream Acanthopagrus schlegelii as an Optional Intermediate Host in Hiroshima Bay

2020 ◽  
Vol 37 (6) ◽  
Author(s):  
Hiroki Fujita ◽  
Kentaro Kawai ◽  
Ryota Taniguchi ◽  
Satoshi Tomano ◽  
Gustavo Sanchez ◽  
...  
Keyword(s):  
Intermediate Host ◽  
Black Sea ◽  
Sea Bream ◽  
The Black Sea ◽  
Acanthopagrus Schlegelii ◽  
Parasitic Isopod

Potential use of macro-algae Gracilaria lemaneiformis in diets for the black sea bream, Acanthopagrus schlegelii, juvenile

Aquaculture ◽  
2013 ◽  
Vol 412-413 ◽  
pp. 167-172 ◽  
Author(s):  
Xiongzhi Xuan ◽  
Xiaobo Wen ◽  
Shengkang Li ◽  
Dashi Zhu ◽  
Yuanyou Li
Keyword(s):  
Black Sea ◽  
Sea Bream ◽  
Gracilaria Lemaneiformis ◽  
The Black Sea ◽  
Acanthopagrus Schlegelii ◽  
Potential Use ◽  
Macro Algae

scholarly journals Multi-Criteria Analysis of the Mass Tourism Management Model Related to the Impact on the Local Community in Constanta City (Romania)

Inventions ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 46
Author(s):  
Catalin Anton ◽  
Angela-Eliza Micu ◽  
Eugen Rusu
Keyword(s):  
Black Sea ◽  
Seasonal Cycle ◽  
Local Community ◽  
Local Economy ◽  
Management Model ◽  
The Black Sea ◽  
Mass Tourism ◽  
Tourism Management ◽  
The Impact ◽  
The City

Traditionally and socially, the tourism in Constanta is considered to be important to the local economy. Sun and beach locations are both a draw for locals and tourists to the city, on the Black Sea. However, vacation-oriented activities in the city only have a seasonal cycle. In this paper, we proposed to analyze the mass tourist activity in Constanta, taking into account economic, social, and environmental conditions. Additionally, we attempted to build a model based on the data available. The model was developed using a PESTEL analysis to determine the supportability factor of the indicators identified. We also set out to create a projection of the activities proposed for analysis by 2050. To create a model for coastal areas, the data used in this research must be accurate and consistent. Furthermore, correctly identifying indicators and their relationships is a critical step in conducting a thorough study. Last but not least, finding the calculation coefficient for the activity in question is critical, as collecting data from various activities might be challenging when trying to find a feasible model.

Parentage determination of black sea bream (Acanthopagrus schlegelii) for stock enhancement: effectiveness and loss of genetic variation

2021 ◽  
Vol 40 (6) ◽  
pp. 41-49
Author(s):  
Binbin Shan ◽  
Yan Liu ◽  
Na Song ◽  
Changping Yang ◽  
Shengnan Liu ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Black Sea ◽  
Stock Enhancement ◽  
Sea Bream ◽  
Acanthopagrus Schlegelii

Anthropogenic Impact on the Lithodynamics of the Coastal Zone of the Southern and Western Black Sea Coast (Review)

2021 ◽  
Author(s):  
T. V. Efremova ◽  
Yu. N. Goryachkin ◽  
◽  
Keyword(s):  
Coastal Zone ◽  
Black Sea ◽  
Bottom Sediments ◽  
Anthropogenic Impact ◽  
River Flow ◽  
The Black Sea ◽  
Negative Consequences ◽  
Coastal Zones ◽  
Natural Dynamics ◽  
The Impact

Anthropogenic impact on lithodynamics of the coastal zone changes the natural dynamics of bottom sediments, which leads to increased abrasion and swelling of beaches, activation of landslide processes creating a threat of destruction of the coastal infrastructure. The article aims at providing an overview of the scientific literature on the anthropogenic impact on lithodynamics of the coastal zone of the southern and western coasts of the Black Sea (shores of Romania, Bulgaria and Turkey). The work shows that with all the differences in the natural conditions of the coastal zones of these countries the types of anthropogenic effects they undergo are almost the same. These include: hydrotechnical construction without regard to the impact on the neighbouring coast sections; reduction of solid river flow due to river regulation by reservoirs; construction of capital facilities directly on the beaches; illegal extraction of sand from beaches and river beds; dredging with sale of the extracted material to construction companies; covering of cliffs by various structures; destruction of coastal dunes, etc. The main negative consequences of these actions are reflected in disruption of natural dynamics and shortages of bottom sediments, changes in the coastline, reduced aesthetic attractiveness and accessibility of shores, destruction of coastal ecosystems. The article also provides information on the legislation of these countries regarding environmental management in the coastal zone

THE ECONOMIC-MILITARY IMPORTANCE OF THE BLACK SEA – NORTH SEA CORRIDOR FOR ENSURING STABILITY IN SOUTHEAST EUROPE

2021 ◽  
Vol 17 (1) ◽  
pp. 141-146
Author(s):  
Valentin-Costinel TOTIR ◽  
Roxana ALEXANDRU
Keyword(s):  
Eastern Europe ◽  
Black Sea ◽  
North Sea ◽  
The Black Sea ◽  
Southeast Europe ◽  
European Continent ◽  
Black Sea Region ◽  
South Eastern ◽  
South Eastern Europe ◽  
The Impact

Abstract: During history, the main channel of communication and cooperation between countries was through commerce and, consequently, through transport. Among all the transport ways, the maritime transport is the one that offers the best cost – benefits ratio. This article is addressed to all the people involved or interested in the economic and military fields and aims to highlight the importance of the Black Sea and North Sea connecting corridor in ensuring peace and stability in Europe in general and in South-Eastern Europe in special. To achieve this goal, we will review the historical conflicts among European countries for waterway control and make a descriptive analysis of the stability situation in the areas affected by them. Furthermore, using the hypothetical-deductive method, we will highlight the manner in which the connection of the Black Sea with the North Sea has influenced economic and military exchanges between riparian states and the impact on stability across European continent. At the end of the article, we will show how economic and military stability in south-eastern Europe is influenced and threatened by geopolitical changes in the wider Black Sea region and how this stability can be maintained and strengthened due to the great possibilities for economic cooperation among the countries of Western and South-Eastern Europe. The novelty of this approach is that it aims to analyze the importance of the Black Sea-North Sea channel in the context of fundamental changes in the politico-military situation in South-East Europe, generated by the expansion of the Russian Federation and the conflict between Turkey and Greece, NATO member countries.

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