scholarly journals A study on Maximum Length Record of Saddled Seabream (Oblada melanura Linnaeus, 1758) Caught Off Gökçeada Island (Northern Aegean Sea, Turkey)

2020 ◽  
Vol 9 (1) ◽  
pp. 58-61 ◽  
Author(s):  
Özgür CENGİZ
Keyword(s):  
Aegean Sea ◽  
Maximum Length ◽  
Northern Aegean Sea

scholarly journals A New Maximum Size Record of the Shi Drum (Umbrina cirrosa Linnaeus, 1758) for Aegean Sea

2020 ◽  
Author(s):  
Ö. Cengiz ◽  
Ş. Ş. Paruğ
Keyword(s):  
Aegean Sea ◽  
Maximum Size ◽  
September 11 ◽  
Maximum Length ◽  
Total Weight ◽  
Single Specimen ◽  
Total Length ◽  
New Findings ◽  
The World ◽  
Northern Aegean Sea

Abstract The present study has been conducted to find out new findings on maximum length and weight values of Umbrina cirrosa in the Bay of Saros (Northern Aegean Sea, Turkey). On September, 11, 2016, a single specimen of Umbrina cirrosa with 68.8 cm total length and 2600.00 g total weight was caught by handline at a depth of 20 m. The provable size is the second largest length ever reported in the all seas of the world

Genetic studies in four populations of the Northern Aegean Sea, Greece

1989 ◽  
Vol 78 (1) ◽  
pp. 89-106
Author(s):  
R. Schliwa ◽  
Angela Dannewitz ◽  
K. Gilbert ◽  
H. Walter
Keyword(s):  
Aegean Sea ◽  
Genetic Studies ◽  
Northern Aegean Sea

Abundance and population structure of the blue crab Callinectes sapidus (Decapoda, Portunidae) in Thermaikos Gulf (Methoni Bay), northern Aegean Sea

Crustaceana ◽  
2018 ◽  
Vol 91 (6) ◽  
pp. 641-657 ◽  
Author(s):  
Kosmas Kevrekidis ◽  
Chryssanthi Antoniadou
Keyword(s):  
Population Structure ◽  
Blue Crab ◽  
Callinectes Sapidus ◽  
Carapace Width ◽  
Seawater Temperature ◽  
Aegean Sea ◽  
Cold Season ◽  
Mean Size ◽  
Northern Aegean Sea ◽  
Fyke Nets

Abstract The blue crab Callinectes sapidus is an alien decapod established in the Mediterranean Sea. Since 2007, increased abundance has been reported from the northern Aegean Sea sustaining local scale fishery. The present work aims to assess the abundance and population structure of C. sapidus in Thermaikos Gulf using fyke nets. Population abundance, estimated as CPUE, exhibited strong temporal variability with decreased values in the cold season; this pattern was correlated with seawater temperature. Females exhibited also spatial differences with increased abundance close to the Aliakmon estuary. In total, 543 individuals were measured for carapace width. Males prevailed in the population; however, mean size was similar between sexes. Larger individuals were caught from deeper waters and the estuarine areas, whereas mean size decreased temporally. The fyke nets used proved to be size-selective, thus preventing fisheries mortality for juveniles. However, recurrent monitoring is necessary for a sustainable management of blue crab fisheries in the gulf.

scholarly journals The Maximum Length Record of the Blackspot Seabream (Pagellus bogaraveo Brünnich, 1768) for the Entire Aegean Sea and Turkish Territorial Waters

2020 ◽  
Vol 8 (10) ◽  
pp. 2125-2130
Author(s):  
Şenol Paruğ ◽  
Özgür Cengiz
Keyword(s):  
Stock Assessment ◽  
Biological Activities ◽  
Aegean Sea ◽  
Maximum Length ◽  
Northern Spain ◽  
Domestic Markets ◽  
Total Length ◽  
North East ◽  
The North ◽  
Pagellus Bogaraveo

The maximum length, weight, and age information of organisms in an ecosystem, moreover, the first records of migrated exotic species are essential in terms of the basis for the studies on population dynamics, stock assessment, and biological activities. Therefore, the recording of such data may be necessary for scientific databases and new related studies. The Blackspot seabream (Red seabream - Pagellus bogaraveo), which belongs to the Sparidae family, is an important seafood which is marketed fresh and frozen around the Mediterranean and the Aegean seas. Nowadays, this species has high prices depending on market demands in domestic markets as a result of overfishing and is also cultured in northern Spain. It is classified as “Near Threatened Species” in the red list due to its decreasing population trend by the IUCN. A single specimen of the Blackspot seabream with 30.7 cm in total length and 390.00 g in total weight, which was angled in the Saros Bay with a handline by a fisherman on February 08, 2019, was obtained from a fishmonger in Çanakkale. Even though there are bigger individuals in the North-east Atlantic probably depending on polar and/or deep-sea gigantism, the mentioned measurement is the proven maximum total length of this species for the Aegean Sea up to the time.

scholarly journals Temporal variations of the fractal properties of seismicity in the western part of the north Anatolian fault zone: possible artifacts due to improvements in station coverage

1995 ◽  
Vol 2 (3/4) ◽  
pp. 147-157 ◽  
Author(s):  
A. O. Öncel ◽  
Ö. Alptekin ◽  
I. Main
Keyword(s):  
Fault Zone ◽  
Statistical Significance ◽  
Rock Fracture ◽  
Aegean Sea ◽  
B Value ◽  
Temporal Variations ◽  
North Anatolian Fault ◽  
North Anatolian Fault Zone ◽  
The North ◽  
Northern Aegean Sea

Abstract. Seismically-active fault zones are complex natural systems exhibiting scale-invariant or fractal correlation between earthquakes in space and time, and a power-law scaling of fault length or earthquake source dimension consistent with the exponent b of the Gutenberg-Richter frequency-magnitude relation. The fractal dimension of seismicity is a measure of the degree of both the heterogeneity of the process (whether fixed or self-generated) and the clustering of seismic activity. Temporal variations of the b-value and the two-point fractal (correlation) dimension Dc have been related to the preparation process for natural earthquakes and rock fracture in the laboratory These statistical scaling properties of seismicity may therefore have the potential at least to be sensitive short- term predictors of major earthquakes. The North Anatolian Fault Zone (NAFZ) is a seismicallyactive dextral strike slip fault zone which forms the northern boundary of the westward moving Anatolian plate. It is splayed into three branches at about 31oE and continues westward toward the northern Aegean sea. In this study, we investigate the temporal variation of Dc and the Gutenberg-Richter b-value for seismicity in the western part of the NAFZ (including the northern Aegean sea) for earthquakes of Ms > 4.5 occurring in the period between 1900 and 1992. b ranges from 0.6-1.6 and Dc from 0.6 to 1.4. The b-value is found to be weakly negatively correlated with Dc (r=-0.56). However the (log of) event rate N is positively correlated with b, with a similar degree of statistical significance (r=0.42), and negatively correlated with Dc (r=-0.48). Since N increases dramatically with improved station coverage since 1970, the observed negative correlation between b and Dc is therefore more likely to be due to this effect than any underlying physical process in this case. We present this as an example of how man-made artefacts of recording can have similar statistical effects to underlying processes.

scholarly journals Hemiasterella aristoteliana n. sp. (Porifera, Hadromerida) from the Aegean Sea with a discussion on the family Hemiasterellidae

1991 ◽  
Vol 61 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Eleni Voultsiadou-Koukoura ◽  
R.W.M. van Soest
Keyword(s):  
New Species ◽  
Mediterranean Sea ◽  
Aegean Sea ◽  
Shallow Waters ◽  
The Family ◽  
The Status ◽  
Northern Aegean Sea ◽  
The Mediterranean ◽  
First Time

A representative of the genus Hemiasterella Carter, 1879 was found for the first time in the Mediterranean Sea during sampling in the shallow waters of the northern Aegean Sea. The new species, H. aristoteliana, is compared with Atlantic Hemiasterella elongata Topsent, 1928. The status of the family Hemiasterellidae is discussed.

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