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February 2011 - present
Publications
Publications (76)
On 28 September 2024, an individual of the pomacentrid genus Abudefduf Forsskål, 1775, was recorded on video in the southwestern Black Sea, off the coast of Turkey. This is the first record of the A. cf. saxatilis/ vaigiensis/troschelii species complex in the Black Sea. The paper provides information on the colouration and some morphological charac...
Two gravid females and one maturing female of Oxynotus centrina were recently caught in the Sea of Marmara. Total length of the maturing and gravid females 482, 534 and 553 mm, respectively. Considering the examined average diameter and weight of the oocytes, as well as gonadosomatic index and hepatospo-matic index values, and ovarian and uterine m...
On 18 December 2023 and 17 August 2024, two male specimens of Mustelus mustelus (1321 mm and 1425 mm TL) were caught during scientific bottom trawling in the northern Sea of Marmara, the first off, the coast of Prince Islands and the second off Ambarlı. The results of the present study showed that male M. mustelus can grow extremely large (at least...
Tub gurnard, Chelidonichthys lucerna, is a common and widely distributed species throughout the Sea of Marmara (SoM). The knowledge on the spatial distribution of tub gurnards in the SoM in association with environmental factors is limited. The relationship between tub gurnard abundance and environmental variables (depth, temperature, dissolved oxy...
Two specimens of Epinephelus costae (Steindachner, 1878) have been observed in the rocky littoral zone of the northeastern Sea of Marmara in the early days of October 2024. E. costae is recorded for the first time from the Sea of Marmara. The present recording also emphasises that the northward migration of thermophilic Mediterranean species is gra...
Two specimens of Epinephelus costae (Steindachner, 1878) have been observed in the rocky littoral zone of the northeastern Sea of Marmara in the early days of October 2024. E. costae is recorded for the first time from the Sea of Marmara. The present recording also emphasises that the northward migration of thermophilic Mediterranean species is gra...
On 28 September 2024, an individual of the pomacentrid genus Abudefduf Forsskål, 1775, was recorded on video in the southwestern Black Sea, off the coast of Turkey. This is the first record of the A. cf. saxatilis/ vaigiensis/troschelii species complex in the Black Sea. The paper provides information on the colouration and some morphological charac...
On 3 September 2024, a longnosed skate, Dipturus oxyrinchus (Linnaeus, 1758), was incidentally caught in a trammel-net fishery in the northern Sea of Marmara at a depth of 100 m. It was a male with a TL of ca. 100 cm and a TW of ca. 3000 g. Surveys conducted in the late 1990s to assess the status of demersal fishery resources in the Sea of Marmara...
Between July 1967 and December 2023, 136 bluntnose sixgill sharks, Hexanchus griseus, were caught in the Sea of Marmara (SoM). Although both a generalised linear model (GLM) and the Mann-Kendall trend test indicated an increasing trend in annual landings of H. griseus, the estimated smoothing splines of the GLM regression trend line revealed a shar...
On 9 August 2024 two specimens of Helicolenus dactylopterus (Delaroche, 1809) were caught by means of a scientific bottom-trawl hauling
towed at a depth range between 143 and 188 m, at the central sector of the Sea of Marmara. After more than 30 years since the last occurrence of H.
dactylopterus in the region, the capture of only two specimens d...
Trawl surveys conducted in shelf waters of the northeastern Sea of Marmara revealed for the first time the occurrence of atypically colored thornback skates, Raja clavata Linnaeus, 1758 (Rajiformes: Raji-dae), in the region. Since atypical coloring may lead to confusion and misidentification of R. clavata, an integrated approach of conventional alp...
Present study deals with the species compositions of trawl haulings performed between December 2014 and September in the eastern part of the Sea of Marmara. As a result of 177 trawl operations, totally 88 species belonging to 7 taxonomic groups were encountered. Osteichthyes were represented by 42 species, Chondrichthyes by 11 species, Crustacea by...
On 21 February 2024, 12 neonate spurdogs (Squaliformes: Squalidae) were captured with a bottom trawl towed over a sandy-muddy bottom at depths of 121-126 m in the eastern sector of the Marmara Sea. Eleven out of 12 spurdogs were identified as Squalus blainville (Risso, 1827), but one of the spurdogs, specimen MD6-24-SquaSp, exhibited several charac...
Between July 1967 and December 2023, 136 bluntnose sixgill sharks, Hexanchus griseus , were caught in the Sea of Marmara (SoM). Although a generalised linear model (GLM) and Mann-Kendal trend analysis both showed an increasing trend in landings per year, the estimated smooth splines of the GLM regression trend line highlights a drastic decline in l...
On February 27, 2018, a female smoothback angelshark, Squatina oculata, was incidentally captured in a gill-net fishery off the Mudanya coast (southeastern Sea of Marmara). An opportunistic photographic record confirmed the emergence of S. oculata in the Sea of Marmara, where its status in the area is considered questionable because of its absence...
From 2010 to 2014, a seasonal study on round goby (Neogobius melanostomus) population dynamics was undertaken in the Southeastern Black Sea and Western Black Sea (Sakarya Shelf and Thrace littoral region). The population of N. melanostomus was highest (mean 23.8 kg/km²) in the coastal shelf regions where there is large river discharge, compared to...
The capture of 176 neonate longnose spurdogs Squalus blainville (Risso, 1827), suggests a potential nursery ground in the eastern Marmara Sea (GFCM GSA28). Sampling was performed by means of a scientific bottom trawl hauled at a depth range of 121-126 m on 21 February 2024. Available data show that S. blainville may be captured in demersal fishery...
On 28 December 2023 two specimens of Trachinotus ovatus (Linnaeus, 1758) have been captured by means of a commercial mid-water trawler off the coast of Türkiye in southwestern Black Sea. The presence of this thermophilic species is likely to be related to increasing seawater temperatures in the region. For the moment, capture locality of the presen...
On 21 December 2023 one specimen of Sebastes schlegelii Hilgendorf, 1880 have been captured by means of a commercial bottom trawler towed at a depth of 30 m off Şile coast. Following its first occurrence in Turkish Black Sea waters off Giresun coast on 6 March 2023, it has recently reported from the Marmara Sea (Gulf of İzmit) on 7 January 2024, ex...
In the present article, the authors report on the first record of Ophisurus serpens (Linnaeus, 1758) from the Sea of Marmara (GFCM geographical subarea 28). A sexually mature male specimen (TL 1841 mm and TW 1801 g) was captured in a gill-net fishery at 96 m depth off the Silivri coast (northern Sea of Marmara, Türkiye).
Morphometric measurements as percentages of total length of 6 specimens of Oxynotus centrina (Linnaeus, 1758), captured in the Sea of Marmara were reported. All of the analyzed proportions of landmark measurements as percentage of total length show allometry. Although, slight differences were seen between the morphometrics of Marmara specimens of O...
Morphometric measurements as percentages of total length of 6 specimens of Oxynotus centrina (Linnaeus, 1758), captured in the Sea of Marmara were reported. All of the analyzed proportions of landmark measurements as percentage of total length show allometry. Although, slight differences were seen between the morphometrics of Marmara specimens of O...
Fisheries are of immense importance to Mediterranean countries, for protein, employment and livelihoods. Studies addressing the factors affecting fish price dynamics are of interest to examine their drivers as prices often dictate target fisheries. This study investigates fish market prices in relation to landings and fish sizes from Türkiye's larg...
A sexually mature male specimen of Ophisurus serpens (Linnaeus, 1758) was caught on 14 January 2023 during gillnet fishing activity at 96 m depth off the coast of Silivri (Northern Sea of Marmara, Türkiye). The total length was 1841 mm and total weight was 1801 g. This individual is the first record for the Sea of Marmara.
In this study, a face-to-face survey was conducted with fishermen between January and May 2022 in order to determine the effects of the mucilage event on fishing activities in the eastern part of the Sea of Marmara. The event started to be seen in the Sea of Marmara in autumn 2020, and its effects gradually increased. A total of 226 fishermen (189...
Considerable by-catch problems have been occurred during deep water pink shrimp targeted commercial beam trawl fishery in the Sea of Marmara. In the study, grid systems were used in order to reduce the untargeted catch and improve the species selectivity. By-catch reduction ratios of beam trawls deployed with and without grid were compared by paral...
The stock structure and productivity components (growth, maturity and mortality) of the Black Sea whiting Merlangius merlangus were studied in the western Black Sea for a year. The results aim to improve fisheries management of whiting in the Black Sea. Fresh samples were collected from commercial bottom trawlers between October 2017 and September...
The study deals with the growth pattern, mortality, and reproduction of common sole, Solea solea (Linneaus, 1758), from the Sea of Marmara (Turkey). A total of 580 fish specimens were sampled monthly from October 2017 to September 2018. The total length of all sampled individuals ranged from 11.1 to 29.5 cm, corresponding to ages from 1 to 3 years....
This document is based on the activities of the ANEMONE project (Assessing the vulnerability of the Black Sea marine ecosystem to human pressures) with the financial support from the Joint Operational Programme Black Sea Basin 2014-2020.
The marbled spinefoot, Siganus rivulatus (Forsskål&Niebuhr, 1775) was recorded for the first time in Izmit Bay, Sea of Marmara. One specimen was caught on 30 September 2019 by a small scale fisherman at depth of 25 m. The fish measured 151 mm in total length and weighted of 43.45 g. S. rivulatus is one of the Lessepsian immigrants who entered the M...
In this study, the efficiency of two fishing methods (a) traditional handline commonly used in the Strait of Istanbul and (b) light rock fishing (LRF), which is beginning to spread in recent years, were investigated by monthly sampling between September 2014 and September 2015. One classic handline fishing tackle and one LRF fishing tackle were use...
This paper updates some information on fish catches from the last dalians (stationary uncovered pound nets) operating off the coast of Istanbul Strait. The data were collected on the weekly basis directly from the owners of the traps. Although the traps have been targeting migratory pelagic fishes during their migration, demersal species have been...
Background. This study is the first attempt to acquire information about growth, age composition, and mortality of European hake, Merluccius merluccius (Linneaus, 1758), in the northern Aegean Sea. In Turkey, the hake is a very important commercial species captured with demersal trawls. Therefore the management of the hake fishery is important for...
Some biometrical measurements and revision on the occurrences of Pterois miles in the Mediterranean Sea are here presented.
II. INTERNATIONAL FISHERIES SYMPOSIUM
IFSC 2018 / GIRNE – TURKISH REPUBLIC OF NORTHERN CYPRUS /
SYMPOSIUM PROCEEDINGS
The aim of this study was to derive length-weight relations (LWRs) for a wide range of fish species collected
from the narrow continental shelf of the western Black Sea, Turkey which is exploited by the bottom trawl fisheries.
Therefore, the present study describes the length-weight relationships for 24 fish species. A total of 31,553 individuals
c...
In this study, the composition and density of marine litter for 50 trawl hauls conducted seasonally between 2015 and 2017 in depths of 40-150 m in the Sea of Marmara were examined.
In this study, which was carried out in 2016 summer season to determine the situation of marine litter in the Black Sea, bottom trawling operations were performed in 20 stations within the scope of Integrated Marine Pollution Monitoring Project (CSB/CEDIDGM-TUBITAK/MAM, 2014-2016).
The main objective of this study was to analyze the differences and similarities in morphometric characteristics among specimens of juvenile little tunny (Euthynnus alletteratus) that were collected from commercial hand line fisheries of Turkish waters (Eastern Mediterranean Sea).
The study deals with the sexual maturity and reproductive patterns of European hake Merluccius merluccius
(L.) from the Sea of Marmara, Turkey. Totally, 777 specimens were sampled monthly between
October 2014 and September 2015. Total lengths of all sampled individuals ranged from 10.4 cm to 55.3
cm. The sex ratio (♂/♀) was 0.56. A total of 341 ova...
This study deals with the age composition, growth and mortality of European hake Merluccius merluccius (L.) from the Sea of Marmara, Turkey. A total of 777 European hakes were sampled monthly from October 2014 to September 2015. Total lengths of all sampled individuals ranged from 10.4 cm to 55.3 cm. The length–weight relationship for all samples w...
This study attempted to determine certain characteristics of the species caught in the boat seine fishery in the İstanbul Strait during the 2009–2010 fishing season, including catch composition, commercial and nontarget catch ratios, catch per unit effort (CPUE), and the length distributions of commercial species. A survey of 20 boat seine operatio...
Illegal trawl activities were evaluated with official records.
This paper presents some biological features of juvenile specimens of Atlantic bluefin tuna, T. thynnus Linnaeus, 1758, in the eastern Mediterranean Sea. A total of 369 specimens were analysed. Juvenile individuals ranged from 12.2 to 46.5 cm. In order to analyse biometry, 11 morphometric characters were analysed. Length-weight relationships of juv...
The main objective of this study was to analyse the differences in morphometric characteristics among specimens of Atlantic juvenile bluefin tuna Thunnus thynnus [12.2-46.5 cm fork length (FL)] and juvenile little tuna Euthynnus alletteratus (14.1-26.4 cm FL). A total of 353 bluefin tuna (young of the year) and 288 little tuna (young of the year) w...
The main objective of this study was to analyze the differences and similarities in morphometric characteristics among specimens of greater pipefish Syngnathus acus Linnaeus, 1758 that were collected and described based on data from bottom-trawl surveys and commercial trawl fisheries in the western Black Sea between September 2010 and October 2011....
In this study, some population parameters and relationship of otolith sizes-fish length of 372 annular sea bream caught from northern Aegean Sea (Gökceada Island) have been investigated. Fish samples were obtained from a survey conducted for selectivity by gill and trammel nets (inner mesh sizes 16, 18, 20,22, 26, 28, 30 and 32 mm (bar length)) in...
The objective of the present study is to assess and describe variation in morphometric characters of H. guttulatus from different southwestern Black Sea coastal locations of Turkey.
This study aims to investigate some biological characteristics of Atlantic bonito, Sarda sarda Bloch, 1793, from the Turkish coasts of the Black Sea and the Sea of Marmara. A total of 212 S. sarda (100 females, 89 males, and 23 undetermined) were sampled monthly between May 2011 and September 2012. The sex ratio (♂/♀) was 0.89; females prevailed bu...
This study aims at giving the results of the catch composition, by-catch and discard ratios in beach seine fishery in the Istanbul Strait. Samples were caught by commercial beach seine vessel from the depth interval 40-65 m, in the period of December 2009 and March 2010. The most abundant commercial species in terms of number and weight were Mullus...
This study aims at giving the results of the catch composition, by-catch and discard ratios in beach seine fishery in the Istanbul Strait. Samples were caught by commercial beach seine vessel from the depth interval 40-65 m, in the period of December 2009 and March 2010. The most abundant commercial species in terms of number and weight were Mullus...
The present study aims at giving the first results of the catch composition in bottom trawl fishery in the Western Black Sea. Samples were caught by commercial trawl from the depth interval 30-100 m, in the period of October 2010 – April 2011. The most abundant commercial species in terms of number and weight were Mullus barbatus and Merlangius mer...
This study aims at giving the results of the catch composition, by-catch and discard ratios in beach seine fishery in the Istanbul Strait. Samples were caught by commercial beach seine vessel from the depth interval 40-65 m, in the period of December 2009 and March 2010. The most abundant commercial species in terms of number and weight were Mullus...
This study aims at giving the results of the catch composition, by-catch and discard ratios in beach seine fishery in the Istanbul Strait. Samples were caught by commercial beach seine vessel from the depth interval 40-65 m, in the period of December 2009 and March 2010. The most abundant commercial species in terms of number and weight were Mullus...
This study aims at giving the results of the catch composition, by-catch and discard ratios in beach seine fishery in the Istanbul Strait. Samples were caught by commercial beach seine vessel from the depth interval 40-65 m, in the period of December 2009 and March 2010. The most abundant commercial species in terms of number and weight were Mullus...
