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Additional Record of Rare Pilot Fish, Naucrates ductor (Linnaeus, 1758) with Some Biological Notes from the Northern Aegean Sea, Türkiye
(Çanakkale Onsekiz Mart Üniversitesi, 2023) Şen, Yusuf; Daban, İsmail Burak; Kalemli, Ceyda
In this study, four individuals of pilot fish Naucrates ductor which were accidentally caught by a commercial purse seiner in Edremit Bay (Aegean Sea) were investigated. The morphometric and meristic characteristics, sex, maturity stages, otoliths, age and stomach contents of the specimens were evaluated. This study contributes to the existing literature by providing additional records from specimens reported from the northernmost location reported so far as well as other biological information for the rarely observed pilotfish.
Age, Growth and Reproduction of the Thornback ray, Raja clavata (Linnaeus, 1758) in the Waters Off Gökçeada (the Northern Aegean Sea)
(Springer Science and Business Media Deutschland GmbH, 2023) Yığın, Cahide Çiğdem; Cabbar, Koray; İşmen, Ali; Daban, İsmail Burak; Arslan İhsanoğlu, Mukadder
In this study, the age, growth, maturity, and reproductive biology parameters of 262 Raja clavata, which were collected monthly from commercial trawlers off Gökçeada between February 2019 and February 2020, were estimated. The individuals comprise of 55.7% females and 44.3% males. The length of the females ranged between 23-84.2 cm (Disc width: 13.5-55.8 cm) and 11.2-74 cm (Disc width: 8-48.9 cm) for males. For age determination, age readings were performed on the vertebrae of 255 Raja clavata specimens (43.5% female, 56.4% male). The calculated von Bertalanffy growth parameters were estimated to be L∞= 93.04 cm, K=0.17 years-1, to=0.48 years for males, and L∞=102.46 cm, K=0.16 years-1, t0 =0.72 years for females. The minimum and maximum ages of the thornback rays ranged from 1 to 10 years. The first sexual maturity length of the population was measured to be L50 =57.7 cm in males, and L50 =66.1 cm in females.
Age, Growth, and Reproduction of Common Sole, Solea solea (Linnaeus, 1758) in the Sea of Marmara, Turkey
(2021) Daban, İsmail Burak; Ihsanoglu, Mukadder Arslan; İşmen, Ali; Yığın, Cahide Çiğdem
This study revealed the length-weight relationship, age, growth and mortality parameters, and reproductive biology of thecommon sole, Solea solea in the Sea of Marmara, Turkey. Samplings were conducted with bottom trawl between March2017 and December 2018 at 34 stations. The length-weight relationship was calculated as W=0.0082×TL3.01. Ages wereranged between 1 and 5 years. The von Bertalanffy growth parameters were calculated as L?=34.56 cm, K=0.48 y-1, and t0=-0.01 y. The size at first maturity was 21.9 cm TL. The extended reproduction period was observed (from September to April).The rates of natural mortality (M), total mortality (Z), fishing mortality (F), and exploitation rate (E) were calculated to be0.79, 2.4, 1.61, and 0.67, respectively. The biological reference points were calculated as Fopt=0.395; Flim=0.53 andEopt=0.333, respectively. The length where the maximum yield can be obtained (Lopt) was found as 22.3 cm TL. The resultsshowed that S.solea is under the influence of excessive fishing pressure in the Sea of Marmara.
Analysis of Demersal Fish Fauna off the Sea of Marmara, Turkey
(Çanakkale Onsekiz Mart Üniversitesi, 2021) Daban, İsmail Burak; İşmen, Ali; Şirin, Murat; Yığın, Cahide Çiğdem; Arslan İhsanoğlu, Mukadder
Demersal fish fauna of the Sea of Marmara, Turkey was determined by bottom trawl surveys between March 2017-December 2018 at 34 stations with the monthly samplings. During the study, a total of 61 teleost and 12 cartilaginous fish species belonging to 42 families were sampled. The target, bycatch and discard rates of CPUE were determined as 13.40%, 69.64% and 16.95%, respectively. In total, 53.9% of the CPUE was stemmed from Trachurus trachurus. Mustelus mustelus, Raja clavata, Merluccius merluccius and Merlangius merlangius had the highest CPUE with a mean of 77.63, 71.86, 71.72 and 72.68 kg/km2, respectively. The highest biodiversity was observed in the southwestern part of the Marmara Sea. With increasing depth, the species number of the teleost fish decreased, whereas the species number of the cartilaginous fish increased. The mean CPUE values of the economical demersal fish species were lower in comparison to those reported from other regions in Turkey. Evidence suggests fish stocks with shallower distribution is under heavier threat against fishing pressure. Since commercial trawling is banned in the Sea of Marmara, beam trawl fishery can be considered as the major threat to demersal fish stocks in the region.
ASLAN BALIĞI Pterois miles (Bennett, 1828)’NIN, EDREMİT KÖRFEZİ’NDEN İLAVE KAYDI
(Doğa ve Sürdürülebilirlik Derneği, 2023) Öztekin, Alkan; Ayaz, Adnan; Altınağaç, Uğur; Özekinci, Uğur; Çakır, Fikret; Daban, İsmail Burak; Şen, Yusuf
Pterois miles (Bennett, 1828) olarak bilinen aslan balığı istilacı tür olup denizel alanlar için son derece tehlikeli bir türdür. 2023 yılının Haziran ayında, Ayvalık/Edremit Körfezi’nde gerçekleştirilen hayalet ağların denizden çıkarılmasına yönelik dalışlarda 12 metre derinlikte tek bir aslan balığı fotoğraflanmış ve dalış ile örneklenmiştir. Bu çalışma aslan balığının Ege Denizi’nden daha kuzeye ilerleyişini destekleyici niteliktedir
Çanakkale Boğazı'nda ihtiyoplankton topluluk yapısı ve zamansal değişimi
(Çanakkale Onsekiz Mart Üniversitesi, 2013) Daban, İsmail Burak; Özen, Özcan
Çanakkale Boğazı'nda balık yumurta ve larvalarının topluluk yapısı ve zamansal değişimini tespit etmek amacıyla 2012-2013 yılları arasında 3 istasyondan (Kepez, Dardanos ve İntepe) yatay ve dikey çekimleri yapılmıştır. Örnekleme aracı olarak 57 cm ağız çapına ve 500 µ göz açıklığına sahip WP-2 tip plankton kepçesi kullanılmıştır. Deniz suyunun sıcaklığının (°C), tuzluluğun (ppt) ve çözünmüş oksijen miktarının (mg/l) balık yumurta ve larvalarının topluluk yapısına olan etkilerini belirleyebilmek amacı ile su parametreleri YSI 6600 MPS sistemi kullanılarak ölçülmüştür. Örneklemeler sonucu toplam 7 takımdan 25 familyaya ait 52 kemikli balık türünün yumurta ve/veya larvası tespit edilmiştir. Balık larvalarının bolluğu ile mevsimler arasında önemli derecede farklılık tespit edilmiştir. En yüksek yumurta tür çeşitliliğinin İlkbahar mevsiminde ve en yüksek larva tür çeşitliliğinin ise Yaz mevsiminde olduğu tespit edilmiştir. Kış mevsimi hem yumurta hem de larva açısından en az çeşitliliğe sahiptir. İstasyonlar ile yumurta ve larva bollukları arasında istatistiksel açıdan önemli fark bulunamamıştır. Çanakkale Boğazı'nda balık yumurtaları açısından M. barbatus barbatus, balık larvaları açısından ise E. encrasicolus en yüksek bolluğa sahip türlerdir. Anahtar sözcükler: Çanakkale Boğazı, İhtiyoplankton, Biyoçeşitlilik, Bolluk, Dağılım
Changes on the Temporal Patterns of Ichthyoplankton Assemblages in the Çanakkale Strait, Türkiye
(2024) Daban, İsmail Burak; Ayaz, Oğuzhan; İşmen, Ali
Monitoring studies in a particular area after a long period of time can provide opportunities to understand environmental, physical and biological events that have occurred over time. From this point of view, we aimed to reveal ichthyoplankton assemblages in the Çanakkale Strait after 10 year period. Our findings indicated a 3 oC difference in sea surface termperature in the late spring and early winter compared to earlier studies. As expected, the highest mean abundance and biodiversity of ichthyoplankton were found in the late spring-early summer period but they showed rapid fluctuations even in consecutive weeks. Coastal resident species such as Diplodus annularis, Gobius niger, and Spicara maena were found to be abundant. In Çanakale Strait, larvae of mesopelagic species were sampled for the first time in this study. The occurrence of mesopelagic species far from their natal habitat in the northern Aegean deep sea trench may indicate a change in the region's hydrodynamics.
Early-Life Population Parameters and Hatch-Date Analysis of Sharpsnout Seabream (Diplodus puntazzo Walbaum, 1792) Juveniles in the Sea of Marmara, Türkiye
(2024) Daban, İsmail Burak; Şen, Yusuf; Öztekin, Alkan; Ayaz, Adnan; Altınağaç, Uğur; İşmen, Ali; Yüksek, Ahsen
This research aims to determine early-life population parameters and hatch date of sharpsnout seabream (Diplodus puntazzo Walbaum, 1792) juveniles using microstructure analyses of sagittal otoliths collected from the Sea of Marmara, Türkiye. Specimens were collected using an experimental beach seine at 12 stations from November 2021 to March 2022. The mean catch per unit effort (CPUE) was 1.1 individuals per haul, with 44.4% of the total D. puntazzo specimens collected at the Erdek Station. A negative allometric growth was calculated from the length-weight relationship equation (W=0.0178L2.698). The daily age ranged between 39 days-1 and 141 days-1, with a mean of 78.9 ± 2.29 days-1. The daily growth rate and mortality ratio were calculated as 0.213 mm/day and 4.38%, respectively. The hatching mainly occurred in September and October.
Edremit Körfezi’nde Av Araçlarının Teknik ve Yapısal Özelliklerindeki Değişiklikler
(2024) Öztekin, Alkan; Şen, Yusuf; Ayaz, Oğuzhan; Uğur, Gençtan Erman; Daban, İsmail Burak; Ayaz, Adnan; Çakır, Fikret
Bu çalışmada, Nisan- Eylül 2023 tarihleri arasında Edremit Körfezi’nde küçük ölçekli balıkçılar tarafından kullanılan av araçlarının teknik ve yapısal özellikleri belirlenerek, av araçlarındaki yıllar içerisindeki değişim tespit edilmiştir. Çalışmada Edremit Körfezi’ndeki Behramkale (Asos), Küçükkuyu, Altınoluk, Güre, Akçay, Burhaniye (Ören), Gömeç, Ayvalık (Merkez) ve Ayvalık (Cunda) bölgelerinde toplam 9 farklı alanda, 399 ticari tekne içerisinden 256 ticari balıkçı ile anket çalışması yapılmıştır. Yapılan anket çalışması neticesinde bölgedeki küçük ölçekli balıkçıların farklı özelliklerde 3 ince ve 4 kalın paragat takımı, 1’er adet karides ağı, zargana ağı, dil ağı, bırakma ağı, bakalyaro ağı, 16 barbun ağı, 3 alamana ağı, 7 voli ağı, 2 köpekbalığı ağı, 4 uskumru-kolyoz ağı, 6 mezgit ağı, 8 kupes ağı ve 17 adet farklı tipte marya ağı kullandığı tespit edilmiştir. Bu çalışmada Edremit Körfez’inde yapılan önceki çalışmalara göre, uzatma ağlarında farklı özelliklerde 32 adet uzatma ağı, 3 adet farklı özellikte paragat takımı tanımlanmıştır. Sonuç olarak Edremit Körfezi’ndeki balıkçılık alanlarında küçük ölçekli balıkçıların kullandığı uzatma ağları ve paragat takımlarının çeşidi artarken, yıllara göre takımların teknik ve yapısal özelliklerinde değişiklikler olduğu belirlenmiştir. Av araçlarındaki bu değişimlerin bölgedeki balık stokları üzerindeki etkilerini ortaya koyan çalışmalar yürütülmelidir.
Feeding Ecology of Thornback Ray, Raja clavata (Linnaeus 1758) in Gökçeada Island, Northern Aegean Sea, Turkey
(Springer Science and Business Media Deutschland GmbH, 2022) Daban, İsmail Burak; Cabbar, Koray; Yığın, Cahide Çiğdem
The dietary composition and nutritional alteration resulting from time and size of thornback ray, Raja clavata, were investigated in the present research. For this purpose, the individuals were obtained from the commercial bottom trawl vessels operated around Gökçeada Island, North Aegean Sea, Turkey between February 2019 and February 2020. The female:male ratio was found to be 1:0.79. The vacuity index was calculated for males, females and both individuals to be 5.8%, 4.7%, and 5.3%, respectively. The major food item groups were determined to be decapod crustaceans, teleost fish, and cepholopoda with IRI% (Index of Relative Importance) values of 77.72, 7.05, and 0.25, respectively. The best-represented food item was found to be Goneplax rhomboides. The prey types, abundance, and biodiversity were observed to change with the increasing lengths of R. clavata. The trophic level (TLw) of R. clavata was calculated to be 3.27, and it was observed that the TLw values were increased with the increasing individual length. The diet overlap was found to range from 40 to 49 cm and 50 to 59 cm TL in autumn and winter. The highest prey biodiversity was found in the length group of 70–85 cm TL and during spring. This study presents detailed findings on the feeding behaviour of R. clavata. In the future, food competition between the species should be monitored to develop a better understanding of the diet overlap. Thus, more comparisons should be conducted between the studies performed in varied geographical areas.
Gökçeada kıyılarında bulunan bazı Sparidae türlerinin erken yaşam evrelerindeki populasyon parametrelerinin belirlenmesi
(Çanakkale Onsekiz Mart Üniversitesi, Lisansüstü Eğitim Enstitüsü, 2018) Daban, İsmail Burak; İşmen, Ali
Bu tez çalışmasında balıkların erken yaşam evrelerindeki değişimlerin belirlenmesi hedeflenmiştir. Bu amaçla tüm larvaların bolluk, çeşitlilik ve zamansal değişimi, referans türlerin (Pagellus bogaraveo ve Diplodus annularis) günlük büyüme ve ölüm parametreleri ile mide içeriği çalışılmıştır. Araştırma materyali Mayıs 2015–Mart 2016 tarihleri arasında Gökçeada kıyı sularından (0-20 m) WP-2 tip plankton kepçesi yardımıyla horizontal plankton örneklemesi gerçekleştirilerek temin edilmiştir. Çalışma bölgesinde, 31 familya ve 55 türe ait toplam 2281 adet balık larvası örneklenmiştir. Sardina pilchardus toplam 8036.1 n/1000 m3 (%55.1) bollukla en baskın tür olduğu görülmüştür. D.annularis türünün pelajik larval süresi, ortalama günlük büyüme oranı ve ölüm oranı sırasıyla 24 gün, 0,242 mm gün-1 ve 0,1444–0,3866 aralığında, P.bogaraveo için 31 gün, 0,164 mm gün-1 ve 0,164–0,242 aralığında belirlenmiştir. D.annularis ve P.bogaraveo larvaları yoğun olarak copepodun farklı evreleri ile beslenmektedir. D.annularis'in midelerindeki besin bileşen çeşidi ve sayısının P.bogaraveo'ya göre daha fazla olduğu görülmüştür. Ülkemizde larval aşamada büyüme özelliklerini inceleyen ilk ve başlangıç niteliğindeki bu çalışmanın sonuçlarının bundan sonra gerçekleşecek çalışmalara referans olabileceği, balıkçılık yönetimi açısından stokların korunması konusunda fayda sağlayabileceği düşünülmektedir.
Growth and exploitation of Salema Sarpa salpa (Linnaeus, 1758) (Sparidae) in the North Aegean Sea, Türkiye
(2023) Daban, İsmail Burak; Uğur, Gençtan Erman; İşmen, Ali
Salema, Sarpa salpa (Linnaeus, 1758), is a herbivorous fish species of the family Sparidae. It is an important predator of benthic algae, especially seagrass Posidonia oceanica. Due to excessive herbivorous behaviour, ecological importance becomes more significant than economical value. Thus, the aim of this study was to contribute scientific knowledge of Salema stock distributed around North Aegean Sea, Turkey with reveal age structure, growth, mortality, and exploitation rates. For this purpose, a total of 412 specimens, varied between 10.2 cm and 38.0 cm TL in length were obtained by commercial gill net fisheries monthly. The length-weight relationship (LWRs) was calculated as W=0.01898*TL2.883 (r2=0.97), and growth type was determined as negative allometric in all sexes. The von Bertalanffy growth parameters were calculated as L?=41.6 cm, K=0.21 y-1, and t0=-1.50 y, and the total mortality (Z), natural mortality (M), fishing mortality (F), and exploitation rate (E) were calculated as 2.04, 0.44, 0.81, and 0.65, respectively. The fishing mortality optimum reference point (Fopt), fishing mortality limit reference point (Flim), optimum exploitation rate (Eopt) and the length where the maximum yield can be obtained (Lopt) were calculated as Fopt=1.02, Flim=1.36, Eopt=0.44, and Lopt=28.6, respectively.
Growth Parameters and Reproductive Biology of Citharus linguatula (Linnaeus, 1758) from the Sea of Marmara (Turkey)
(2021) Daban, İsmail Burak; Ihsanoglu, Mukadder Arslan; İşmen, Ali; Şirin, Murat; Yığın, Cahide Çiğdem
An economically important species of Citharus linguatula was investigated in the Sea of Marmara (Eastern Mediterranean, Turkey). Length-weight relationships, growth parameters, reproductive time, and first sexual maturity length of the species were determined. A total of 236 individuals were analyzed, total length and weight varied from 7.5 to 26.5 cm TL (17.11±3.62 cm) and 2.67 to 180.81 g (44.07±1.84 g), respectively. The length-weight relationship was calculated as W=0.0047*TL3.17 in total. The growth type was positive allometry for both sexes. Total individuals were ranged in age between 1 and 4. According to sexes, von Bertalanffy growth parameters were calculated as L?=23.44 cm, K=0.74 per year, and t0=-0.09 year for females and L?=20.75 cm, K=0.56 per year, and t0=-1.14 year for males. The size at first maturity was 17.6 cm TL for males, and 16.7 cm TL for females. When sexual maturity, K, and GSI values were evaluated together, the reproduction period of C. linguatula was determined between September and December.
Kuzey Ege Denizi'nde kupes uzatma ağlarında hedef dışı av olarak yakalanan bazı balık türlerinin seçiciliği
(2017) Subakan, Gökhan; Öztekin, Alkan; Daban, İsmail Burak; Ayaz, Adnan
Bu çalışmada 20, 22, 23 ve 25 mm ağ göz genişliğine sahip kupes uzatma ağlarından yakalanan Melanur (Oblada melanura), Karagöz (Diplodus vulgaris), Isparoz (Diplodus annularis) ve Sarıkuyruk İstavrit (Trachurus meditterraneus) türlerinin uzatma ağı seçiciliği belirlenmiştir. Balikçilik denemeleri Mart 2008 - Şubat 2010 tarihleri arasinda Kuzey Ege Denizi'nde gerçekleştirilmiştir. Seçicilik parametreleri SELECT metot kullanılarak tahmin edilmiştir. En uygun seçicilik modelinin melanur (O. melanura) ve ısparoz (D. annularis) için log-normal, sarıkuyruk istavrit (T. meditterraneus) ve karagöz (D. vulgaris) için ise bi-modal olduğu belirlenmiştir. 20, 22, 23 ve 25 mm ağ göz genişliğinde optimum yakalama boyları sırası ile Isparoz (D. annularis) için 11.15, 12.27, 12.83 ve 13.94 cm, Karagöz (D. vulgaris) için 11.26, 12.39, 12.95 ve 14.08 cm, Melanur (O. melanura) için 15.3, 16.83, 17.59 ve 19.12 cm ve sarıkuyruk istavrit (T. mediterraneus) için 26.68, 29.35, 30.68 ve 33.35 cm olarak tespit edilmiştir. Bu sonuçlar Kuzey Ege Denizi'nde kupes avcılığında kullanılan uzatma ağlarında 23 mm ağ gözü genişliğinden daha büyüğünün kullanımının sürdürülebilir avcılık açısından önemli olduğunu ortaya çıkarmıştır.
Larval Morphological Development and Seasonal Variation of the Mediterranean Sand Eel, Gymnammodytes cicerelus (Rafinesque, 1810) in the Shallow Waters of Gökçeada Island, North Aegean Sea
(Çanakkale Onsekiz Mart Üniversitesi, 2020) Daban, İsmail Burak; İşmen, Ali
Kum yılan balığı, Gymnammodytes cicerelus (Rafinesque, 1810), Ammodytidae familyasına ait olan demersal ve subtropical bir türdür. Bu çalışmada kum yılan balığı larvalarının morfolojik gelişimi ve zamansal değişimi çalışılmıştır. İhtiyoplankton örnekleri Gökçeada kıyı sularından Eylül 2015 ile Nisan 2016 tarihleri arasında toplanmıştır. Örneklemeler horizontal çekimler ile WP-2 tip plankton kepçesi (500 μm netle donatılmış 57 cm çember çapına ve 3 m toplam net uzunluğuna sahip) ile gerçekleştirilmiştir. Erken yaşam evreleri fotoğraflanmış ve 2.73–7.91 mm standart boy aralığındaki bireylerin morfolojik değişimler kapsamlı olarak tanımlanmıştır. Üreme sezonunun Kasım ile Şubat arasında olduğu, üremenin Aralık ayında pik yaptığı tespit edilmiştir. Larval bolluk değeri birim alanda 6.36 ile 69.96 n/1000 m3 arasında değişmiştir. Bu çalışmada ilk kez türün Akdeniz’de ki larval bolluk ve dağılımı ortaya konmuştur.
New Occurrence of Atlantic Tripletail, Lobotes surinamensis (Bloch, 1790) from the Turkish Part of the Aegean Sea, with Biological Notes
(2021) Daban, İsmail Burak; Cabbar, Koray
A new record of Lobotes surinamensis (Bloch, 1790) around Saros Bay, North Aegean Sea is presented, based on a single hermaphrodite specimen with detailed biological information. On 12 June 2018, the specimen was captured by fishermen with gillnets at a depth of 25 m. Sex, age, and stomach content were determined. This new record proves the Northernmost distribution of the species in the Turkish part of the Aegean Sea.
Relationships between Otolith Dimensions and Total Length of Some Small-sized Fish Species from the Marmara Sea, Türkiye
(Mersin Üniversitesi, 2024) Şen, Yusuf; Daban, İsmail Burak
The small-sized adult and juvenile fish species have great ecological importance by means of the prey-predator relationship. Due to these species become prey of larger fish species, their otoliths are mostly seen in the stomach content of predators. The fish size-otolith size studies reveals robust data for estimating fish size from the otolith size. To contribute this aspect, the relationships between total length and otolith length (TL-OL), total length and otolith width (TL-OW), total length and otolith radius (TL-OR) of seven species (Liza sa-liens, Pomatoschistus marmoratus, Pomatoschistus bathi, Pomatoschistus minutus, Synapturichthys kleinii, Chelidonichthys lucerna and Symphodus roissali) were investigated. Species were obtained by beach-seine nets from 12 sampling stations in the shallow waters of the Marmara Sea. While calculating the relationships, linear regression analysis (y = bx + a) was used and the coefficient of determination (R2) was identified. The R2 values were usually seen as high in all equations. The highest values of R2 for TL-OL and TL-OW were obtained from P. minutus, while the highest values of TL-OR detected were for C. lucerna. The lowest values of R2 for TL-OW and TL-OR were obtained from P. marmoratus, while the lowest values of TL-OL were de-tected for P. bathi. This study revealed the first results for P. minutus, S. kleinii, S. roissali in the Turkiye Seas and for P. bathi in the worldwide by means of fish length – otolith size relationships
Reproductive biology of Penaeus kerathurus (Forskal, 1775) (Decapoda: Penaeidae) in the Sea of Marmara, Turkey
(De Gruyter Open Ltd, 2021) Arslan İhsanoğlu, Mukadder; Daban, İsmail Burak; İşmen, Ali; Cabbar, Koray; Yığın, Cahide Çiǧdem
One of the economically important species is Penaeus kerathurus (Forskål, 1755), which is widespread in the Mediterranean ecosystem. This paper presents results of research on reproductive biology of Penaeus kerathurus in the Sea of Marmara. A total of 1404 specimens were dissected to determine the maturity stages, reproduction time, and length at first reproduction. The female-to-male ratio was 1:0.9. A high percentage of mature females was determined in April, May and July. Moreover, the value of the gonadosomatic index (GSI) decreased after July. The spawning period was observed between April and July, and its intensity increased in July. The carapace length at first sexual maturity was determined to be 39 mm.
Selectivity of some fish species caught as bycatch by bogue gillnets around North Aegean Sea
(Ege Üniversitesi, 2017) Subakan, Gökhan; Öztekin, Alkan; Daban, İsmail Burak; Ayaz, Adnan
In this study, gillnet selectivity of saddled seabream (Oblada melanura), common two-banded seabream (Diplodus vulgaris), annular seabream (Diplodus annularis) and Mediterranean horse mackerel (Trachurus meditterraneus) which were caught by bogue gillnets with 20, 22, 23 and 25 mm mesh size (nominal bar lenght) have been determined. Fishing trials were carried out in Noth Aegean Sea from March 2008 to February 2010. Selectivity parameters were estimated using the Select method. Most suitable selectivity models were calculated as log-normal for saddled seabream (O. melanura) and annular seabream (D. annularis), bi-modal for Mediterranean horse mackerel (T. meditterraneus) and common two-banded seabream (D. vulgaris). Optimum catch lengths for 20, 22, 23 and 25 mm mesh size were 11.15, 12.27, 12.83 ve 13.94 cm for annular seabream (D. annularis), 11.26, 12.39, 12.95 and 14.08 cm for common two-banded seabream (D. vulgaris), 15.3, 16.83, 17.59 and 19.12 cm for saddled seabream (O. melanura) and 26.68, 29.35, 30.68 and 33.35 cm for Mediterranean horse mackerel (T. mediterraneus), respectively. These findings may help us to understand that using higher than 23 mm stretched mesh size with gillnets which have been used for commercial bogue fisheries around north Aegean Sea is important for sustainability of fisheries
Some Notes on Morphometry and Population Biology of Shi Drum Umbrina cirrosa Juveniles in the Marmara Sea, Turkiye
(Springer Science and Business Media Deutschland GmbH, 2024) Daban, İsmail Burak; Şen, Yusuf
In this study, we revealed ontogenetic development, length-weight relationship, otolith size relationships, otolith shape analyses, spatial distribution of mean abundance and feeding of Shi drum, Umbrina cirrosa juveniles in the Marmara Sea, Turkiye. The individuals ranged in total length (TL) between 49.44 mm and 128.46 mm, with a mean of 98.43 +/- 5.43 mm; and the specimens were distributed in weight from 1.15 g to 21.51 g, with a mean of 9.63 +/- 1.23 g. The total length-weight relationship was calculated as W = 0.000008xTL(3.0163) and an isometric growth was detected. U. cirrosa had relatively large sagittal otoliths, and the otolith size - fish size relationships were detected as linear. The otolith shape analyses showed that the juvenile sagitta shape indices are relatively the same as the adults. Stomach content of juvenile Shi drum contained mostly Amphipoda. The biological data on the early life stages of Shi drum is scarce, and the outputs of the presented data reveal first detailed results.

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