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Öğe Age and growth of the nakedband gaper, Champsodon nudivittis (Ogilby, 1895), from the Iskenderun Bay, Northeastern Mediterranean(Cahiers De Biologie Marine, 2014) Yağlıoğlu, Deniz; Deniz, Tomris; Ergüden, Deniz; Gürlek, Mevlüt; Turan, CemalThe nakedband gaper Champsodon nudivittis (Ogilby, 1895) was first recorded in 2009 on Turkish coastal waters, and has rapidly increased around this region. C. nudivittis is the first lessepsian immigrant of Champsodontid species in the Turkish coastal waters. The present study aims to determine the age and growth parameters of C. nudivittis colonized in the Iskenderun Bay, North-eastern Mediterranean Sea. A total of 296 collected individuals (seasonally average 74 specimens) were studied from November 2011 to October 2012. Total specimen lengths and weights ranged from 6.00 to 14.40 cm and from 1.4 to 29.3 g respectively. Maximum age was 2 years for both sexes. The length-weight relationship was described as W= 0.0040 x L-3.207 (R-2 = 0.957)5 W= 0.0005 x L-3.158 (R-2 = 0.959) and W= 0.0040 x L-3.196 (R-2 = 0.955). The parameters of von Bertalanffy growth fitted to mean observed total lengths-at-age for each sex separately and estimated as L-infinity= 20.41 cm, K= 0.224 year(-1), t(0)= -2.491 year for females,L-infinity= 21.53 cm, K= 0.199 year(-1), t(0)= -2.154 year for males, and as L-infinity= 21.10 cm, K= 0.210 year(-1), t(0)= -2.639 year for combined sexes.Öğe Age and growth of the needlefish, Tylosurus imperialis (Rafinesque, 1810) from the Levantine coast, North-Eastern Mediterranean(Univ Oradea Publ House, 2025) Erguden, Deniz; Turan, Cemal; Ivanova, Petya Pavlova; Dogdu, Servet Ahmet; Raykov, Violin Stoyanov; Yankova, Maria; Yaglioglu, DenizThe present study is the first to determine the age and growth parameters of the needlefish Tylosurus imperialis in the Northeastern Mediterranean. A total of 320 specimens of T. imperialis were caught by gill nets from Turkish coasts (Iskenderun Bay) in the Northeastern Mediterranean between October 2020 and September 2021. The maximum age was 5 years for both sexes combined, and the age group 3-4 comprised 77.5 % of the samples. The total length distribution of T. imperialis was 60 to 109 cm, and the weight distribution was 309 to 1985 g. The b value was between 3.20 and 3.31 for females and males, respectively. The parameter b from the length-weight relationship characterizes a positive allometric growth. Growth equations were calculated as W=0.0006xL(3.2026) (R-2= 0.912) for females, W=0.0004xL(3.3163) (R-2= 0.896) for males, and W= 0.0005xL(3.2456) (R-2=0.904) for all specimens. Von Bertalanffy growth parameters were L-infinity= 139.29 cm, K= 0.119 year(-1), t(0)= -1.819 year for females, L-infinity= 138.50 cm, K= 0.113 year(-1), t(0)= -1.834 year for males and L-infinity= 138.33 cm, K= 0.112 year(-1), t(0)= -1.839 year for all specimens. The spawning period of T. imperialis was determined to be between April and August for both sexes. This data will be useful for the fisheries management of needlefish stocks in our study area and elsewhere.Öğe Biological and Growth Parameters of Short-beaked Garfish Belone svetovidovi from the Black Sea(Springer Int Publ Ag, 2025) Yaglioglu, Deniz; Turan, Cemal; Ivanova, Petya Pavlova; Erguden, Deniz; Dogdu, Servet Ahmet; Gurlek, Mevlut; Ergenler, AysegulThe age composition and growth parameters of the Short-beaked garfish Belone svetovidovi collected from the Ak & ccedil;akoca coast in the southwestern Black Sea (D & uuml;zce, T & uuml;rkiye) were investigated. A total of 352 B. svetovidovi individuals were collected monthly from January 2022 to December 2022, including 189 females (54.0%) and 163 males (46.0%). When the length-frequency distribution of B. svetovidoviwas analysed, it was found that the length group with the highest number of individuals was the same for both females and males (34.0-34.9 cm), with 35 females and 38 males. The b value in males, females and all individuals was greater than 3, indicating positive allometric growth. The samples of B. svetovidovi individualswere between 1 and 4 years old, with ages 2 and 3 years accounting for 73.54% of female individuals, 80.98% of male individuals and 76.99% of all individuals, respectively. There was no statistically significant difference between the age groups of males and females at ages 1, 2, and 3 while a significant difference was found between 4-year-old males and females (P < 0.05). The Von Bertalanffy growth values were determined as follows: for females, L = 65.501 [1-e(-0.109 (t+2.586))]; for males, L = 66.751 [1-e(-0.108 (t+2.621))]; and for all individuals, L = 66.596 [1-e(-0.108 (t+2.666))]. The mean condition factor values were found to be 0.1090 +/- 0.015 for females, 0.1085 +/- 0.015 for males, and 0.1087 +/- 0.015 for all individuals. The distribution of gonadosomatic index values by gender showed an increase in February-March-September and a decrease in October-December for both females and males. According to the data obtained from the study, the reproductive period for both female and male individuals was identified as the 7-month period from March to September. This study has revealed, for the first time, some reproductive and growth parameters of the ShÖğe Elasmobranch bycatch in a bottom trawl fishery in the Iskenderun Bay, northeastern Mediterranean(Cahiers De Biologie Marine, 2015) Yağlıoğlu, Deniz; Deniz, Tomris; Gürlek, Mevlüt; Ergüden, Deniz; Turan, CemalTotal biomass, species composition, depth distribution, seasonal distribution and abundance of elasmobranchs were examined by commercial bottom trawls between 2009 and 2010 from Iskenderun Bay, Turkish coast of the northeastern Mediterranean. From 52 bottom trawl surveys, it was estimated that elasmobranchs represented 23% (190.1 kg.km(-2)) of total fish biomass (840.8 kg.km(-2)) in Iskenderun Bay. Dasyatis pastinaca, Gymnura altavela, Raja clavata and Rhinobatos spp. (Rhinobatos rhinobatos and Glaucostegus cemiculus) showed high occurrence and represented each between 11.10 and 38.46% of the whole elasmobranch biomass. The other species, Dipturus oxyrinchus, Raja miraletus, Torpedo marmorata and Torpedo torpedo, represented each between 0.12 and 2.82% of the total elasmobranchs biomass. Shark species, Mustelus mustelus, Scyliorhinus stellaris, Scyliorhinus canicula, Galeus melastomus and Squatina squatina, represented each between 0.45 and 1.7% of the whole elasmobranchs biomass. When seasonal distribution was examined, total catch of fish were 32.38, 23.24, 10.71 and 33.65%, of which elasmobranchs species constitute 24.11, 34.12, 20.42 and 21.34% in autumn, winter, spring and summer respectively. Single or sporadic captures were also recorded for Isurus oxyrinchus, Carcharhinus plumbeus, Carcharhinus altimus, Oxynotus centrina, Raja radula, Rhinoptera marginata and Pteromylaeus bovinus.Öğe First record of the blue-barred parrotfish, Scarus ghobban Forsskal, 1775 from Turkish coastal waters(Wiley-Blackwell, 2014) Turan, Cemal; Ergüden, Deniz; Gürlek, MEvlüt; Yağlıoğlu, Deniz; Uygur, Necdet…Öğe Genetics Structure Analysis of Turbot (Scophthalmus maximus, Linnaeus, 1758) in the Black and Mediterranean Seas for Application of Innovative Management Strategies(Frontiers Media Sa, 2019) Turan, Cemal; Ivanova, Petya Pavlova; Raykov, Violin Stoyanov; Gürlek, Mevlüt; Ergüden, Deniz; Yağlıoğlu, Deniz; Giragosov, Vitaly…Öğe Occurrence of Dusky Grouper Epinephelus marginatus (Lowe, 1834) from the Black Sea: Is it the Mediterranization Process of the Black Sea?(Cemal TURAN, 2021) Yağlıoğlu, Deniz; Turan, CemalA single specimen of Dusky Grouper Epinephelus marginatus (Lowe, 1834) on 14 November 2021 at a depth of about 10 m from the southwestern Black Sea (Amasra, Turkey) was captured by a fisherman with fishnet. In this study, dusky grouper Epinephelus marginatus was recorded for the first time from the Black Sea as a new Mediterranean species for the Black Sea fish fauna.Öğe Occurrence of Schedophilus ovalis (Cuvier, 1833) (Osteichthyes: Centrolophidae) in the North-Eastern Mediterranean, Turkey(Wiley-Blackwell, 2013) Ergüden, Deniz; Yağlıoğlu, Deniz; Turan, Cemal…Öğe On the occurrence of the giant devil ray Mobula mobular (Bonnaterre, 1788) from the Mediterranean coast of Turkey - a by-catch documentation(Wiley-Blackwell, 2013) Yağlıoğlu, Deniz; Turan, Cemal; Gürlek, Mevlüt…Öğe POPULATION STRUCTURE ANALYSIS OF RED BARRACUDA, SPHYRAENA PINGUIS (PERCIFORMES, SPHYRAENIDAE) IN THE NORTH-EASTERN MEDITERRANEAN SEA USING MORPHOMETRIC AND MERISTIC CHARACTERS(Parlar Scientific Publications (P S P), 2015) Yağlıoğlu, Deniz; Turan, Cemal; Gürlek, MevlütPopulation structure of red barracuda, Sphyraena pinguis, in north-eastern Mediterranean waters was investigated using morphometric and meristic characters. In discriminant function analysis, first, second and third discriminant functions explained 48.6%, 30.2% and 21.2% of the between-group variation respectively. Plotting first and second discriminant functions explained 81.1% of the between-group variation, and revealed the existence of four morphologically distinct populations of S. pinguis in the north-eastern Mediterranean coastal waters. A correct classification of individuals into their original population was ranged from 93.3% to 96.7%, and the overall random assignment was high (96.7%). The proportion of correctly classified individuals into their original group was the same and greatest (96.7%) for the Iskenderun Bay and Syrian samples. In hierarchical cluster analysis, the Mersin Bay sample was clustered as the first clade, while the Iskenderun Bay and Syrian samples were in the neighbouring clades, and the Antalya Bay sample was clustered as the most divergent. Examination of the contribution of each morphometric and meristic character to the first and second principal components revealed that the observed differences were mainly from the characters associated on head length and eye diameter, indicating that these characters are important in the detected differentiation of the populations.Öğe Systematic identification of needlefish (Belonidae) species using molecular genetic and morphological markers in the Mediterranean and Black Seas(Public Library Science, 2025) Turan, Cemal; Ivanova, Petya Pavlova; Dogdu, Servet Ahmet; Erguden, Deniz; Raykov, Violin Stoyanov; Yankova, Maria; Yaglioglu, DenizIn this study, we aimed to clarify the taxonomic status of Belonidae species distributed in the Mediterranean Sea and the Black Sea by conducting detailed genetic and morphological markers. A total of 550 needlefish samples were caught between January 2022 and January 2024. The data set used in the study contains a total of 171 sequences for the COI gene and 120 sequences for the 12s rRNA gene from different Belonidae species, including data from GenBank. Systematic analysis of needlefish species was investigated by using sequencing of mtDNA COI and 12s rRNA gene regions and morphological characters in the Turkish Marine Waters. A separate analysis of the two mitochondrial genes supported by morphological characters revealed that each species is grouped within itself. The genetic and morphological analyses showed that Belone belone acus and Belone belone euxini which are considered as the subspecies of Belone belone are not subspecies of the genus Belone and should be considered at the species level, Belone belone. Belone svetovidovi is also considerably different from Belone belone and should be considered as a different species. T. acus imperialis, which is thought to be distributed in the Mediterranean Sea, is not a subspecies of Tylosorus acus and should be revised as Tylosorus imperialis which genetically differs from Tylosorus acus and also other Tylosorus species at the species level.
