Age and growth of the four-spotted megrim (Lepidorhombus boscii) in eastern Mediterranean waters

1999 ◽  
Vol 79 (1) ◽  
pp. 171-178 ◽  
Author(s):  
V. Vassilopoulou ◽  
I. Ondrias
Keyword(s):  
Growth Rate ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Age And Growth ◽  
First Year ◽  
The North ◽  
Significant Difference ◽  
Negative Effect ◽  
North Aegean Sea ◽  
First Year Of Life

This paper analyses the age and growth pattern of the four-spotted megrim (Lepidorhombus boscii), collected in the north Aegean Sea. The otoliths of the species exhibit bilateral asymmetry. Our data indicates that males have shorter lifespans (0–6 y) than females (0–8 y) and reach lower asymptotic lengths. A significant difference in growth rate exists between the two sexes after the first year of life. Growth in length is greater in females than males, whereas males appeared to be heavier than females of the same size. The latter was also corroborated by the higher accumulation of lipids in the muscle of males in relation to females. The growth rate of the species in the Atlantic was higher than in the Mediterranean. The oligotrophic character of the study area seemed to have a negative effect on the growth of megrims.

scholarly journals A three dimensional, full life cycle, anchovy and sardine model for the North Aegean Sea (Eastern Mediterranean): Validation, sensitivity and climatic scenario simulations

2021 ◽  
Vol 22 (3) ◽  
pp. 653
Author(s):  
ATHANASIOS GKANASOS ◽  
EUDOXIA SCHISMENOU ◽  
KOSTAS TSIARAS ◽  
STYLIANOS SOMARAKIS ◽  
MARIANNA GIANNOULAKI ◽  
...  
Keyword(s):  
Temperature Increase ◽  
Eastern Mediterranean ◽  
Larval Growth ◽  
Somatic Growth ◽  
Aegean Sea ◽  
Fish Growth ◽  
Prey Concentration ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

We present the development of a 3D full-lifecycle, individual-based model (IBM) for anchovy and sardine, online coupled to an existing hydrodynamic/biogeochemical low-trophic level (LTL) model for the North Aegean Sea. It was built upon an existing 1D model for the same species and area, with the addition of a horizontal movement scheme. In the model, both species evolve from the embryonic stage (egg+yolk sac larva) to the larval, juvenile, and adult stages. Somatic growth is simulated with the use of a “Wisconsin” type bioenergetics model and fish populations with an adaptation of the ‘super individuals’ (SI) approach. For the reference simulation and model calibration, in terms of fish growth and population biomass, the 2000-2010 period was selected. Interannual biomass variability of anchovy was successfully represented by the model, while the simulated biomass of sardine exhibited low variability and did not satisfactorily reproduce the observed interannual variability from acoustic surveys. The spatial distribution of both species’ biomass was in relatively good agreement with field data. Additional single-species simulations revealed that species compete for food resources. Temperature sensitivity experiments showed that both species reacted negatively to a temperature increase. Anchovy, in particular, was more affected since its spawning and larval growth periods largely overlap with the period of maximum yearly temperature and low prey concentration. Finally, simulation experiments using IPCC climatic scenarios showed that the predicted temperature increase and zooplankton concentration decrease in the future will negatively affect anchovy, resulting in sardine prevalence.

scholarly journals Development, application and evaluation of a 1-D full life cycle anchovy and sardine model for the North Aegean Sea (Eastern Mediterranean)

PLoS ONE ◽  
2019 ◽  
Vol 14 (8) ◽  
pp. e0219671 ◽  
Author(s):  
Athanasios Gkanasos ◽  
Stylianos Somarakis ◽  
Kostas Tsiaras ◽  
Dimitrios Kleftogiannis ◽  
Marianna Giannoulaki ◽  
...  
Keyword(s):  
Life Cycle ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
The North ◽  
Full Life Cycle ◽  
North Aegean ◽  
Full Life ◽  
North Aegean Sea ◽  
Development Application

Age, growth and reproductive biology of the saddled seabream (Oblada melanura) in the North Aegean Sea, Eastern Mediterranean

2020 ◽  
Vol 49 (1) ◽  
pp. 13-22 ◽  
Author(s):  
Ismail Burak Daban ◽  
Ali Ismen ◽  
Mukadder Arslan Ihsanoglu ◽  
Koray Cabbar
Keyword(s):  
Growth Parameters ◽  
Eastern Mediterranean ◽  
Length Distribution ◽  
Total Mortality ◽  
Aegean Sea ◽  
Growth Equation ◽  
Weight Relationship ◽  
The North ◽  
North Aegean Sea ◽  
First Maturity

AbstractThis study determines the length distribution, length– weight relationship, age, growth parameters, mortality rate, sex ratios, length at first maturity and reproduction of saddled seabream (Oblada melanura) collected monthly by fishermen around the Northern Aegean Sea between November 2017 and October 2018. The length–weight relationship was calculated as W=0.0091×L3.11 (R2=0.95) and positive allometric growth was found. The condition factor and GSI varied between 0.81–1.58 and 0.01–9.61, respectively. The spawning season extended from May to July and peaked in June. Total lengths at 50% maturity were 18.97 cm for males and 18.83 cm for females. Parameters of the von Bertalanffy growth equation were: L∞ =29.91 cm, K =0.27 per year, t0 =−0.82 year and age varied between 1 and 8. The instantaneous rates of total mortality (Z) and natural mortality (M) were 1.36 and 0.58 per year, respectively. Rates for fishing mortality F and exploitation E were 0.78 and 0.57 per year, respectively. The mean absolute fecundity (F) was 117 075±23 243 oocytes, ranging from 19130 to 470 132.

Temporal Variations in Fine Sand Assemblages in the North Aegean Sea (Eastern Mediterranean)

2004 ◽  
Vol 89 (2) ◽  
pp. 175-187 ◽  
Author(s):  
Evdokia Kourelea ◽  
Dimitrios Vafidis ◽  
Chariton-Charles Chintiroglou ◽  
Georgios Trontsios ◽  
Louis Chicharo
Keyword(s):  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Fine Sand ◽  
Temporal Variations ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

scholarly journals New Fisheries-related data from the Mediterranean Sea (April 2014)

2014 ◽  
Vol 15 (1) ◽  
pp. 213 ◽  
Author(s):  
K. STERGIOU ◽  
D.C. BOBORI ◽  
F.G. EKMEKÇİ ◽  
M. GÖKOĞLU ◽  
P.K. KARACHLE ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Feeding Habits ◽  
Aegean Sea ◽  
Northern Greece ◽  
Related Data ◽  
The North ◽  
North Aegean ◽  
The Mediterranean ◽  
North Aegean Sea

As part of its policy, Mediterranean Marine Science started from 2014 to publish a new series of collective article with fisheries-related data from the Mediterranean Sea. In this first collective article we present length frequencies and weight-length relationships for the northern brown shrimp Farfantepenaeus aztecus in the eastern Mediterranean, length-weight relationships for 10 fish species in the North Aegean Sea, the feeding habits for 11 sparid fishes in the North Aegean Sea, a review of the existing literature on the feeding and reproduction of common carp Cyprinus carpio in Anatolia (Turkey) and mouth dimensions and the relationships between mouth area and length for seven freshwater fishes from Lake Volvi (Northern Greece).

Food-web traits of the North Aegean Sea ecosystem (Eastern Mediterranean) and comparison with other Mediterranean ecosystems

2010 ◽  
Vol 88 (2) ◽  
pp. 233-248 ◽  
Author(s):  
K. Tsagarakis ◽  
M. Coll ◽  
M. Giannoulaki ◽  
S. Somarakis ◽  
C. Papaconstantinou ◽  
...  
Keyword(s):  
Food Web ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Mediterranean Ecosystems ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

Age and Growth of the Red Mullet Mullus barbatus in the North Aegean Sea

2019 ◽  
Vol 59 (4) ◽  
pp. 572-582
Author(s):  
S. Tüzün ◽  
C. Dalyan ◽  
L. Eryilmaz
Keyword(s):  
Aegean Sea ◽  
Age And Growth ◽  
The North ◽  
Red Mullet ◽  
Mullus Barbatus ◽  
North Aegean ◽  
North Aegean Sea

The occurrence of the Atlantic penaeid prawn Farfantepenaeus aztecus (Ives, 1891) in the Thermaikos Gulf (Aegean Sea, eastern Mediterranean): considerations on the potential establishment and impact on the autochthonous Melicertus kerathurus (Forskål, 1775)

Crustaceana ◽  
2014 ◽  
Vol 87 (14) ◽  
pp. 1606-1619 ◽  
Author(s):  
Kosmas Kevrekidis
Keyword(s):  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Western Atlantic ◽  
The North ◽  
Levantine Sea ◽  
Farfantepenaeus Aztecus ◽  
Penaeid Prawn ◽  
North Aegean ◽  
Abiotic And Biotic Factors ◽  
North Aegean Sea

The penaeid prawn Farfantepenaeus aztecus (Ives, 1891), of western Atlantic origin, has been recently recorded in a lagoonal environment in the Thermaikos Gulf (North Aegean Sea) increasing the number of alien decapods in the Aegean Sea to 29. The present work reports the finding of F. aztecus in offshore waters on the trawling ground of the Thermaikos Gulf. The presence of this alien species in the area is probably due to ships’ ballast water or to expansion northward from the Levantine Sea where it was recently reported. The life cycle characteristics and several properties of the Atlantic species along with the abiotic and biotic factors of the Thermaikos indicate that the species will eventually be established successfully in the gulf. However, the potential establishment of F. aztecus in the Thermaikos Gulf raises concerns over the fate of the autochthonous penaeid prawn Melicertus kerathurus (Forskål, 1775) in the North Aegean Sea.

The biology of Acanthoclinus quadridactylus (Bloch and Schneider) (Teleostei-Blennioidea). I. Age, growth, and food

1968 ◽  
Vol 19 (1) ◽  
pp. 1 ◽  
Author(s):  
JB Jillett
Keyword(s):  
Growth Rate ◽  
Single Species ◽  
Age And Growth ◽  
Gut Contents ◽  
First Year ◽  
Selective Feeding ◽  
Important Food ◽  
Growth Zones ◽  
First Year Of Life

Age, growth, and food of a population of Acanthoclinus quadridactylus were studied from December 1959 to December 1960. Age and growth were investigated by means of length frequencies of fish and by the analysis of growth zones shown in their sagittal otoliths. The growth rate decreases with age and growth is retarded during winter months. Fish live to a maximum age of at least nine years at which time they are approximately 20 cm long. There are no marked differences in growth or longevity between the sexes. Analysis of gut contents showed that A. quadridactylus is an omnivorous carnivore. Diet is apparently restricted by availability rather than by selective feeding. Decapods were the most important food organisms and Petrolisthes elongatus was the most important single species. Other food organisms included (in order of importance) isopods, barnacles, amphipods, chitons, gastropods, bivalves, polychaetes, fish, and bryozoans. There is evidence of a change of diet in the first year of life.

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