Growth Parameters of Blotched Picarel (Spicara maena Linnaeus, 1758) From Saros Bay (Northern Aegean Sea, Turkey)

In this study, the growth parameters of the four-spotted megrim, (Lepidorhombus boscii Risso, 1810), were studied in Saros Bay, which had been closed to bottom trawl fishery since 2000. The sex ratio of females to males was 1:0.42. Length-weight relationships were W=0.0032L3.31 and W=0.0069L3.04 for females and males, respectively. Growth parameters of the populations were L∞=49.8 cm, k=0.09 year-1, t0=-2.15 year for females; L∞=39.1 cm, k=0.11 year-1, t0=-2.59 year for males. The growth performance index (Φ’) was found to be 2.35 and 2.23 for females and males, respectively.

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

Zeitschrift für Morphologie und Anthropologie ◽

10.1127/zma/78/1989/89 ◽

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

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

Crustaceana ◽

10.1163/15685403-00003795 ◽

2018 ◽

Vol 91 (6) ◽

pp. 641-657 ◽

Cited By ~ 4

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.

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Feeding Ecology of Thornback Ray, Raja clavata (Linnaeus 1758) in Gökçeada Island, Northern Aegean Sea, Turkey

Thalassas An International Journal of Marine Sciences ◽

10.1007/s41208-021-00363-8 ◽

2021 ◽

Author(s):

İsmail Burak DABAN ◽

Koray CABBAR ◽

Cahide Çiğdem YIĞIN

Keyword(s):

Feeding Ecology ◽

Aegean Sea ◽

Thornback Ray ◽

Raja Clavata ◽

Northern Aegean Sea

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Earthquake in the northern Aegean Sea, 2001

Earthquake Prediction by Seismic Electric Signals ◽

10.1007/978-3-642-24406-3_19 ◽

2012 ◽

pp. 165-168

Author(s):

Mary S. Lazaridou-Varotsos

Keyword(s):

Aegean Sea ◽

Northern Aegean Sea

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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

Nonlinear Processes in Geophysics ◽

10.5194/npg-2-147-1995 ◽

1995 ◽

Vol 2 (3/4) ◽

pp. 147-157 ◽

Cited By ~ 16

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.

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

Bijdragen tot de Dierkunde ◽

10.1163/26660644-06101004 ◽

1991 ◽

Vol 61 (1) ◽

pp. 43-49 ◽

Cited By ~ 7

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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