A new apparatus for the direct measurement of otter trawling effects on the epibenthic and hyperbenthic macrofauna

2003 ◽  
Vol 83 (6) ◽  
pp. 1363-1368 ◽  
Author(s):  
P.T. Koulouri ◽  
C.G. Dounas ◽  
A.S. Eleftheriou
Keyword(s):  
Continental Shelf ◽  
Mechanical System ◽  
Direct Measurement ◽  
Eastern Mediterranean ◽  
Otter Trawl ◽  
Continuous Record ◽  
New Apparatus ◽  
Surface Vessel

A towed trawl simulator sledge (TTSS2) for collecting quantitatively small macrobenthic animals disturbed by the passage of otter trawl groundrope typical of the local fishery is described and illustrated. The TTSS2 was towed from a surface vessel at a speed within the range of commercial trawls, incorporating three sampling nets that open and close by means of an electro-mechanical system. An odometer in contact with the seabed provided a continuous record of the trawled ground. The degree of efficiency of the TTSS2—by means of the attached groundrope that stirs up the surface of the bottom ahead of the nets—was tested in the northern continental shelf of Crete (eastern Mediterranean). Additional trials with a much heavier groundrope were also performed. Analysis and comparison of TTSS2 samples with endobenthic, hyperbenthic and planktonic samples collected by means of conventional sampling gears indicate the presence of a well-defined and distinct fauna in the plume of resuspended sediment behind the groundrope.

scholarly journals ICHTHYOFAUNA IN THE INNER CONTINENTAL SHELF NEXT TO THE PARANAGUÁ ESTUARINE COMPLEX, SOUTHERN BRAZIL

2021 ◽  
Vol 46 (4) ◽  
pp. 1-13
Author(s):  
Cesar SANTOS ◽  
Roberto SCHWARZ JUNIOR ◽  
Helen Audrey PICHLER ◽  
Olímpio Rafael CARDOSO ◽  
Marcelo Renato LAMOUR ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Fish Assemblages ◽  
Fish Fauna ◽  
Temporal Variations ◽  
Otter Trawl ◽  
Rainfall Regime ◽  
Wet Season ◽  
Environmental Characteristics ◽  
The North ◽  
Inner Continental Shelf

The composition and structure of fish assemblages in the inner continental shelf of the Paraná State are affected by cold fronts and the rainfall regime. Data from fishing activities in this region, as well as the analysis of environmental characteristics, are the main tools available for understanding fish dynamics, under influence of increasing human activities. In order to better understand patterns and temporal variations in fish assemblages in the inner continental shelf of the Paraná State, a total of 24 double trawls were performed with an otter trawl between August 2000 and July 2001, in two sampling areas, the North area in front of the northern mouth of the Paranaguá Estuary Complex, and the South area, in front of the Leste beach. A total of 45,277 fish specimens belonging to 35 families and 97 species were caught. Sciaenidae was the most abundant family, with 37.1% of the total number of individuals caught, and with the highest richness (18 species). Statistical analyses evidenced significant differences in environmental characteristics and in fish fauna, and that both areas disturbances were observed in the fish assemblages during the dry and wet season, being more intense in the Southern area, disturbances that would be related to the shrimp fishing present in the two areas sampled in this study.

scholarly journals Demersal fish community on the inner shelf of Ubatuba, southeastern Brazil

1998 ◽  
Vol 46 (2) ◽  
pp. 93-109 ◽  
Author(s):  
Gecely R. A. Rocha ◽  
Carmen L. D. B. Rossi-Wongtschowski
Keyword(s):  
Continental Shelf ◽  
Coastal Water ◽  
Fish Community ◽  
Species Abundance ◽  
Fish Fauna ◽  
Sampling Period ◽  
Demersal Fish ◽  
Southeastern Brazil ◽  
Otter Trawl ◽  
South Atlantic Central Water

Fluctuations in the distribution and abundance of demersal fishes collected by otter trawl on the continental shelf of Ubatuba were examined over a two-year sampling period, in an area up to 50 m depth. A total of 111 species were collected. Seasonal and annual fluctuations in species abundance were related to differences in the distribution of Coastal Water and South Atlantic Central Water masses. The demersal fish fauna in the area was divided into three ecologically distinct communities: Tropical Sciaenid, Subtropical Sciaenid, and Gerreid-Haemulid. The most important one is the Tropical Sciaenid Community, characterized by Ctenosciaena gracilicirrhus, Paralonchurus brasiliensis, and Cynoscion jamaicensis.

Trace metal distribution in sediments of northern continental shelf of Crete Island, Eastern Mediterranean

2008 ◽  
Vol 58 (4) ◽  
pp. 843-857 ◽  
Author(s):  
S. E. Poulos ◽  
C. G. Dounas ◽  
G. Alexandrakis ◽  
P. Koulouri ◽  
P. Drakopoulos
Keyword(s):  
Trace Metal ◽  
Continental Shelf ◽  
Eastern Mediterranean ◽  
Metal Distribution ◽  
Crete Island ◽  
Trace Metal Distribution

scholarly journals Evidence of a dense water vein along the Libyan continental margin

2008 ◽  
Vol 26 (1) ◽  
pp. 1-6 ◽  
Author(s):  
G. P. Gasparini ◽  
A. Bonanno ◽  
S. Zgozi ◽  
G. Basilone ◽  
M. Borghini ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Continental Margin ◽  
Deep Water ◽  
Eastern Mediterranean ◽  
Water Production ◽  
Ionian Sea ◽  
Eastern Mediterranean Sea ◽  
Deep Layers ◽  
Water Production Rate ◽  
First Time

Abstract. For the first time it was possible to investigate a still poorly known region of the eastern Mediterranean Sea, the Libyan continental margin. An oceanographic cruise, performed during summer 2006, revealed an important and novel feature: a dense vein flowing along the continental slope. The paper describes the vein evolution with some insights on its dynamic and furnishes an estimate of its transport, which results to be comparable with the Adriatic Deep Water production rate. The cascading into a steep canyon which incises the continental shelf suggests that the vein may play an important role in ventilating the deep layers of the Ionian Sea.

Turkey’s Legal Approach to the Maritime Disputes in the Eastern Mediterranean

2021 ◽  
Vol 23 (Winter 2021) ◽  
Author(s):  
Yücel Acer
Keyword(s):  
Continental Shelf ◽  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Eastern Mediterranean Sea ◽  
Exclusive Economic Zones ◽  
Political Tension ◽  
Southern Cyprus ◽  
Maritime Disputes ◽  
Legal Arguments ◽  
Economic Zones

For more than a decade, the states bordering the Eastern Mediterranean Sea have been in disagreement over the delineation of their maritime boundaries. The disagreements concern various parts of the region and create enormous political tension over energy-related activities. Ever since Egypt and the Greek Administration of Southern Cyprus (GASC) signed the very first delimitation agreement of the region, without securing Turkey’s involvement, Turkey has issued many official statements and carried out energy-related activities in the region. Based on the principle that maritime delimitation should be carried out to reach an equitable solution by taking all the relevant circumstances into account, Turkey has developed a comprehensive legal approach as to the maritime delimitation in the Eastern Mediterranean and even submitted a map to the UN to demonstrate Turkey’s claimed continental shelf and Exclusive Economic Zones (EEZ) areas. The details of this comprehensive approach should be examined, to identify both the claims of Turkey over the maritime borders and the related legal arguments.

Root Causes of the Eastern Mediterranean Dispute: Approaches of the Main Actors

2021 ◽  
Vol 23 (Winter 2021) ◽  
Author(s):  
Sertaç Hami Başeren
Keyword(s):  
Continental Shelf ◽  
International Law ◽  
Preventive Measures ◽  
Eastern Mediterranean ◽  
Eastern Mediterranean Region ◽  
Western Boundary ◽  
The West ◽  
Southern Cyprus ◽  
And Control ◽  
Of Greece

The Eastern Mediterranean region is said to host five percent of the world’s known natural gas reserves. That stimulates tension when coupled with the aspirations of some states to claim these resources and control their transport to the markets. The claims of Greece and the Greek Administration of Southern Cyprus (GASC), which has always acted as if it were the sole representative of the island, seem to be extreme, given the relevant the rules of international law. In order to achieve its aspirations over Libya, France has recently intervened in regional developments on the side of Greece. Turkey has declared that its continental shelf in the Eastern Mediterranean extends up to 28° E longitude and that the western boundary of the Turkish continental shelf to the west of this longitude shall be drawn through equitable agreements with all concerned states. Turkey has also taken certain preventive measures to protect its rights and interests by making particular references to the relevant rules of international law. The present commentary examines the real motivations behind the acts of all sides and reviews their justifications with reference to international law, with particular reference to Turkey’s actions

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