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A Hermatophroditic Specimen of Chub Mackerel Scomber japonicus in the Dardanelles, Turkey
(Medwell Online, 2009) Ozekinci, Ugur; Ayaz, Adnan; Altinagac, Ugur; Cengiz, Ozgur; Öztekin, Alkan
A hermaphroditic individual of the Chub mackerel, Scomber japonicus, caught in the Dardanelles is described in this study. This specimen is the first record of hermaphroditic Chub mackerel for the Mediterranean Sea.
Age, Growth, Mortality and Reproduction of the Chub Mackerel (Scomber japonicus Houttuyn, 1782) from Saros Bay (Northern Aegean Sea, Turkey)
(Central Fisheries Research Inst, 2012) Cengiz, Ozgur
Age, growth, mortality and reproduction of the chub mackerel (Scomber japonicus Houttuyn, 1782) were determined using specimens collected from Saros Bay between January 2009 and December 2009. The length-weight relationship was calculated as W=0.0061TL(3.12) for females, W=0.00691TL(3.08) for males and W=0.0066TL(3.10) for all samples Growth parameters of the populations were L-infinity=37.3 cm, k=0.22 year(-1), t(0)=-1.93 year for females; L-infinity=41.4 cm, k=0.17 year(-1), t(0)=-2.37 year for males and L-infinity=39.0 cm, k=0.20 year(-1), t(0)=-2.13 year for all samples. It was observed that spawning period occurred between June and August. The length at first maturity was estimated as 18.0 cm for all samples. Total mortality rate (Z), natural mortality rate (M), fishing mortality rate (F) and exploitation rate (E) of the chub mackerel were 0.91 year(-1), 0.34 year(-1), 0.57 year(-1) and 0.62 year(-1), respectively
An investigation on fyke nets in Canakkale Region
(Ege Univ, 2006) Ayaz, Adnan; Altinagac, Ugur; Cengiz, Ozgur
Fyke nets are type of traps are used in fresh - water such as lake, river and running water, also they are used in shallow water such as sea shore, lagoon, strait and having a current sea. They catch creatures by guiding with wings towards the entrance of the trap. In this study a fyke net has 36 mm mesh size, 6 m length and 1x 1.5 m entrance width was tried in the Dardanelles Strait. This trap was set up to right current and catching efficiency was observed. In the trials with this net, two banded bream (Diplodus vulgaris), rockfishes (Scorpaena sp.), annular sea bream (Diplodus annularis), painted comber (Serranus scriba), stripped mullet (Mullus surmuletus) and conger ell (Conger conger) were trapped. In addition bogue (Boops boops), saddle bream (Oblada melanura) and painted comber (Serranus scriba) were caught from gills by the wing nets.
Defining the reproductive period of the European pilchard ( Sardina pilchardus Walbaum, 1792) in Saros Bay (North Aegean Sea, Turkey)
(Mekelle Univ, Coll Natural & Computational Sciences, 2024) Cengiz, Ozgur; Ozekinci, Ugur; Oztakin, Alkan
The European pilchard ( Sardina pilchardus Walbaum, 1792) is one of the main target species of commercial fishery along the Aegean coasts. This work was carried out between July 2014 and June 2015 off Saros Bay (North Aegean Sea, Turkey). The study focuses on determining the reproductive period of the species. The elevated GSI values suggested the spawning period occurred mainly between September and May with a peak in February.
Effects of Hanging Ratio on Gill Net Selectivity for Annular Sea Bream (Diplodus annularis) in the Northern Aegean Sea, Turkey
(Medwell Online, 2010) Ayaz, Adnan; Altinagac, Ugur; Ozekinci, Ugur; Cengiz, Ozgur; Öztekin, Alkan
This study has been conducted in the North Aegean Sea around the coasts of the Gallipoli peninsula at 3-30 m of water depth between February 2007 and June 2009. In order to test the effect of the hanging ratio on the selectivity, 9 gillnets with 3 different hanging ratios (E = 0.4-0.6) and 3 different mesh sizes (18-20-22 mm) have been made use of. Other than, the hanging ratios and mesh size all other features and specifications of gill nets were identical. Select method was used to fit gillnet selectivity curves. A total of 64 fishery operations have been performed in the study. The lognormal model gave the best fit for all hanging ratios (for hanging ratio (E) = 0.4-0.6, the model deviance = 138.9, 66.19, 56.23, respectively). It was determined that there was no significant selectivity differences among the same mesh size for different hanging ratios. The results showed that there is no effect of hanging ratios on size selectivity of annular sea bream (Diplodus annularis L.) in north Aegean gillnet fishery.
Further range expansion of the blue crab Callinectes sapidus (Rathbun, 1896) (Crustacea: Decapoda: Brachyura) in Turkish waters, Northern Aegean Sea: insight into distribution depth
(Cahiers De Biologie Marine, 2016) Daban, Ismail Burak; Cengiz, Ozgur; Tuncer, Sezginer
A new record of Callinectes sapidus from the northern eastern part of the Aegean Sea is presented, based on a live single female sampled off northern part of the Gokceada (Imbroz) Island. Surprisingly, the individual which is known shelf-estuarine species was sampled at 220 m depth with a bottom trawl on November 15th, 2015.
Gear characteristic of gillnet and trammel net used in Dardanelles Region and problems of fishermen
(Ege Univ, 2006) Ozekinci, Ugur; Cengiz, Ozgur; Butuner, Sefa
Dardanelles is one of the important fishing areas. In this area, there are 1065 registered fishing boats, %3.2 of these are purseseine and trawl boats, %96.8 of these are other fishing boats which are used for small-scale fishing activities (angling and gillnet trammel net boats). In this study, questionnaire was made with gillnet and trammel net fishermen's. According to the questionnaire results, in Dardanelles region, gillnets, trammel nets (naming as Marya nets) and Stacked trammel nets were determinated as 4.5%, 5.3%, and 90.2%, respectively. Technical plan of nets, used in this area, was drawn and fishermen's problems were presented.
Gillnet selectivity for bogue boops boops caught by drive-in fishing method from Northern Eagean Sea, Turkey
(2009) Ayaz, Adnan; Kale, Serkan; Cengiz, Ozgur; Altinagac, Ugur; Ozekinci, Ugur; Öztekin, Alkan; Altin, Aytac
This study was carried out in six different stations in the Northern Aegean Sea between February-May 2008. In the study, the three different fishing nets which were intensively being used by the region fishermen, the net height of which was 105 meshes and the mesh sizes of which were 44, 46 and 50 mm. In the operations performed with the drive-in fishing method, 5867 and 740 kg fish pertaining to the total 30 species were caught and 4791 were got from bogue being the target species. This value composes of approximately 82% of the total catching. SELECT method was used to fit gill net selectivity curves. Log normal model gave the best fit for the bogue selection. It was observed that modal length and spread values increased as far as the net mesh grew. It was determined that the length groups of bogue individuals we got in our study were quite above the first reproduction length. For this reason, it was seen that the gillnets used in the region did not create fishing pressure over the population. © Medwell Journals, 2009.
Gillnet Selectivity for Bogue Bopps boops Caught by Drive-in Fishing Method from Northern Eagean Sea, Turkey
(Medwell Online, 2009) Ayaz, Adnan; Kale, Serkan; Cengiz, Ozgur; Altinagac, Ugur; Ozekinci, Ugur; Öztekin, Alkan; Altin, Aytac
This study was carried out in six different stations in the Northern Aegean Sea between February-May 2008. In the study, the three different fishing nets which were intensively being used by the region fishermen, the net height of which was 105 meshes and the mesh sizes of which were 44, 46 and 50 mm. In the operations performed with the drive-in fishing method, 5867 and 740 kg fish pertaining to the total 30 species were caught and 4791 were got from bogue being the target species. This value composes of approximately 82% of the total catching. SELECT method was used to fit gill net selectivity curves. Log normal model gave the best fit for the bogue selection. It was observed that modal length and spread values increased as far as the net mesh grew. It was determined that the length groups of bogue individuals we got in our study were quite above the first reproduction length. For this reason, it was seen that the gillnets used in the region did not create fishing pressure over the population.
Growth Characteristics of Annular Seabream (Diplodus annularis Linnaeus, 1758) for Turkish Waters
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019) Cengiz, Ozgur; Kizilkaya, Bayram; Parug, Sukru Senol
This study was conducted between January 2016 and December 2016 in Saros Bay. The weight-length relationship was calculated as W = 0.0331TL(2.77) for all samples. A single specimen of D. annularis with the maximum size (23.2 cm in total length and 180.00 g in total weight) was caught off ibrice Bight (Saros Bay) with han (Hine by fisherman on 25 August 2016. The aim of this study was to present the maximum size record of the related species for the Turkish Waters.
Length-weight relationships for 48 fish species of the Gediz estuary, in Izmir Bay (Central Aegean Sea, Turkey)
(Cambridge Univ Press, 2018) Kara, Ali; Saglam, Cemil; Acarli, Deniz; Cengiz, Ozgur
Length-weight relationships were calculated for 48 fish species from Izmir Bay in the Aegean Sea, Turkey. A total of 3584 fish specimens were captured with beach seine, handline, fyke net, scoop net, castnet and trammel net in 2010-2014. The sample size ranged from three individuals for Squatina squatina to 140 for Mugil cephalus. R-2 values varied between 0.95 for Pomatoschistus bathi and 0.99 for Argyrosomus regius, Chelon labrosus and Mugil cephalus. All regressions were highly significant (P < 0.001). Values of the exponent b in the length-weight regression (W = aL(b)) ranged from 2.750 for S. squatina to 3.514 for Syngnathus acus and the median value was 3.134 with 25-75% of the values ranging between 3.030 and 3.218.
Length-weight relationships of 22 fish species from the Gallipoli Peninsula and Dardanelles (northeastern Mediterranean, Turkey)
(Tubitak Scientific & Technological Research Council Turkey, 2013) Cengiz, Ozgur
Length-weight relationships are presented for 22 fish species from the Gallipoli Peninsula and Dardanelles between September 2006 and October 2009. The b values ranged between 2.78 and 3.28. All species' length-weight relationships were highly significant (P < 0.001).
Maximum Length Record of Common Two-banded Seabream (Diplodus vulgaris Geoffroy Saint-Hilaire, 1817) for Aegean Sea with Turkish Waters
(Adem Yavuz Sonmez, 2019) Cengiz, Ozgur; Parug, Sukru Senol; Kizilayka, Bayram
The maximum length, weight, and age information of living things in an ecosystem are necessary for population dynamics and stock assessment studies. Hence, the recording of such data may be beneficial for scientific databases for life history and fisheries science. The common two-banded seabream (Diplodus vulgaris Geoffroy Saint-Hilaire, 1817) is a widespread demersal marine fish, which belongs to the Sparidae family and inhabits down to 90 m depth. Because it is a demanded seafood, it has commercial importance and usually available in the fish market almost every month of the year in Turkey. A single specimen of common two-banded seabream with 31.9 cm in total length and 467.00 g in total weight, which was caught off Ibrice Bight (Saroz Bay) with handline by a professional fisherman on 12 June 2015, was obtained from a fishmonger. This study aims to present the maximum size record of this species for the Aegean Sea with Turkish waters.
Maximum Size Record of Brown Meagre (Sciaena umbra Linnaeus, 1758) for Aegean Sea
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019) Cengiz, Ozgur; Kizilkaya, Bayram; Parug, Sukru Senol
This study was conducted between January 2013 and December 2013 in Saros Bay. A single specimen of S umbra with the maximum size (41.7 cm in total length and 180.00 g in total length) was caught from Ibrice Bight (Sams Bay) with hand line by fisherman on 20 April 2013. The weight-length relationship was calculated as W = 0.0268TL(2.79) for all samples. The aim of this study is to present the maximum size record of the species for the Aegean Sea.
Monofilament gillnet selectivity parameters for European chub (Leuciscus cephalus L.1758) in Atikhisar Reservoir, Canakkale, Turkey
(Asian Network for Scientific Information, 2007) Ozekinci, Ugur; Altinagac, Ugur; Ayaz, Adnan; Cengiz, Ozgur; Ayyildiz, Hakan; Kaya, Hasan; Odabasi, Deniz
Selectivity parameters of gillnets used for fish catching are very important for fisheries management in lakes. The main purpose of the present study was to estimate the selectivity parameters of monofilament gill nets mesh size of 56, 64 and 72 mm (stretched mesh size) used for European chub (Leuciscus cephalus L.1758) in Atikhisar Reservoir, Canakkale, Turkey. The indirect method proposed by Holt was used for the estimation of the selectivity parameters. The common selection factors and common standard deviation of monofilament gill nets were determined as 4.25 and 2.37, respectively. For sustainable fisheries of european chub, the minimum mesh size of monofilament gill nets must be greater than 47 mm stretched mesh size. © 2007 Asian Network for Scientific Information.
REPRODUCTIVE BIOLOGY OF THE SPOTTED FLOUNDER, CITHARUS LINGUATULA (ACTINOPTERYGII: PLEURONECTIFORMES: CITHARIDAE), FROM SAROS BAY (NORTHERN AEGEAN SEA, TURKEY)
(Wydawnictwo Akad Rolniczej W Szczecinie, 2014) Cengiz, Ozgur; İşmen, Ali; Ozekinci, Ugur
Background. Understanding the reproduction of the spotted flounder, Citharus linguatula (Linnaeus, 1758), has been considered a major step toward understanding its population dynamics, especially, in the northern Aegean Sea. So, the presently reported study aimed to study the reproductive biology of C. linguatula and provided the first data of its fecundity. Materials and methods. This study was carried out between September 2006 and September 2008 in Saros Bay (Northern Aegean Sea, Turkey), which had been closed to trawl fishing since 2000. The gonadosomatic index, length at maturity (L-50), and absolute fecundity were analysed. Results. The elevated GSI values observed, suggested the spawning period was from September to November. The length at maturity (L-50) was at 15.0 cm TL for females and 14.0 TL cm for males. The relations between the absolute fecundity and total length, total weight, and age of the spotted flounder females were estimated as F-a = 0.1878TL(3.29), F-a = 58.515TW + 36.453, and F-a = 887.59A - 389.43, respectively. Conclusion. The identification of reproductive strategy is necessary to obtain a better understanding of its biology.
Second Record of Atlantic Lizardfish, Synodus saurus (Linnaeus, 1758), from the Northern Aegean Coast of Turkey
(Inst Zoology, Bas, 2015) Cengiz, Ozgur; Tuncer, Sezginer
A single specimen of Synodus saurus was caught on 29 May 2014 in the Guneyli Bight. This paper presents the first record of S. saurus in the Gallipoli Peninsula. It is the second finding of the Atlantic lizardfish for the northern Aegean coast of Turkey.
Some biological characteristics of Atlantic bonito (Sarda sarda Bloch, 1793) from Gallipoli Peninsula and Dardanelles (northeastern Mediterranean, Turkey)
(Tubitak Scientific & Technological Research Council Turkey, 2013) Cengiz, Ozgur
This study was carried out to determine some biological characteristics of Atlantic bonito (Sarda sarda Bloch, 1793) from the Gallipoli Peninsula and Dardanelles (northeastern Mediterranean, Turkey) between September 2006 and October 2009. The length weight relationship was estimated as W = 0.0020TL(3.41)(r(2) = 0.96) for females, W = 0.0029TL(3.32) (r(2) = 0.97) for males, and W = 0.0028TL(3.32) (r(2) = 0.97) for all samples. The von Bertalanffy growth parameters were computed as L-infinity 68.5 cm, k = 0.78 year(-1), t(0) = -0.34 years for females; L-infinity = 72.2 cm, k = 0.69 year(-1), t(0) = -0.52 years for males; and L-infinity = 69.8 cm, k = 0.76 year(-1), t(0) = 0.44 years for all samples. The length at first maturity was estimated to be 41.9 cm for females and 35.8 cm for males.
Some Reproductive Characteristics of Four-spotted megrim (Lepidorhombus boscii Risso, 1810) from Saros Bay (Northern Aegean Sea, Turkey)
(Ankara Univ, Fac Agr, 2015) Cengiz, Ozgur; Ozekinci, Ugur; İşmen, Ali; Öztekin, Alkan
This study was carried out between September 2006 - September 2008 in Saros Bay (Northern Aegean Sea, Turkey). The fish samples were collected using a commercial bottom trawl net with 44 mm codend mesh size at depths ranging from 0 to 500 m The spawning period of four-spotted megrim (Lepidorhombus boscii Risso, 1810) occurred between February and May. First sexual maturity length was 14.9 cm for females and 15.3 cm for males. Absolute fecundity - total length, absolute fecundity - total weight and absolute fecundity - age relationships were estimated as F=1.487 x TL3.22, F=264.39 x W + 14.103 and F= 12.207 x A - 11.279, respectively. This study includes first data on some reproductive characteristics of four-spotted megrim for Turkish waters.
Weight-Length Relationship and Reproduction of Bogue (Boops boops Linnaeus, 1758) in Saros Bay (Northern Aegean Sea, Turkey)
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019) Cengiz, Ozgur; Parug, Sukru Senol; Kizilkaya, Bayram
This study was conducted between January 2014 and December 2015 in Saros Bay. The spawning period was estimated by monthly analyses. the changes of the gonad somatic index (GSI) using the equation: GSI = (Gonad Weight / Total Weight - Gonad Weight) x 100. The weight - length relationship was calculated using the equation W = aL(b). It was observed that spawning period occurred between March and May. The weight-length relationship was calculated as W = 0.008511(3.11) for females. W = 0.0095TL(3.07) for males.

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