Deniz Bilimleri ve Balıkçılık Dergisi (2018 - halen)
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Öğe Comparison of CPUE, Size Distribution and Bycatch Rates of Gill and Trammel Net Used for Supplying Bait to Setline Fishing(Çanakkale Onsekiz Mart Üniversitesi, 2024) Özyurt, Caner; Köylü, İbrahimWithin the scope of this study, 15 experimental fishing operations were carried out from the beginning of March 2020 until mid-June of the same year, to compare the gill net and trammel nets (16mm gill net, 16mm gill net and 18mm trammel net) used to supply bait to the setline fishing. The results obtained showed that the dominant species for both 16mm gill net and 16mm trammel nets was Chelon auratus. There were no statistically significant differences between the two types of nets in terms of CPUE (number/operation), average length and length distribution (p>0,05). It was determined that 41% of all individuals caught in gill nets and 44% of all individuals caught in trammel nets were bycatch species. When 16mm and 18mm trammel nets were compared with respect to catch composition, the dominant species for these two mesh widths was Chelon auratus, and the difference between the two mesh widths in terms of CPUE was not statistically significant (p>0,05), but the difference was statistically significant in terms of average length and length distribution (p<0,05). The rate of non-target species caught in 16mm and 18mm trammel nets was determined to be 41% and 22%, respectively. It was determined that the number of fishing hooks (fishing power) used in a season in professional fishing gear fishing was 67553 pieces. This data also approximated the number of mullets (approximately 3.3 tons) used as bait in Yumurtalık Bay in a season. As a result, the rate of bycatch in bait fishing with gillnets is remarkable and it is recommended to conduct studies on the survival rate of bycatch species released back into the sea. In addition, it is recommended to investigate the potential of substituting mullets which can be used as human food with artificial baits.Öğe Reproductive Biology of Red Pandora (Pagellus bellottii Steindachner, 1882) from the Coast of Ghana and Implications for Management(Çanakkale Onsekiz Mart Üniversitesi, 2024) Amponsah, Samuel K.K.A total of 933 samples of Pagellus bellottii were obtained from the coast of Ghana between January and December 2019, from commercial catches to determine the sex ratio, maturity stages, spawning period, and length at first maturity. The male to female ratio was 1.39:1. July and May were the main spawning peaks for female individuals of the assessed fish species. Two spawning periods were observed with a minor spawning period from November to January and major spawning from March to September. Female individuals matured slightly earlier than male individuals at 20 cm and 20.8 cm respectively. The results of this study could help to revise the existing minimum capture size of Red Pandora in Ghana.Öğe Determination of the Length-Weight Relationship and Otolith Biometry Characteristics of Scorpaena scrofa (Linnaeus, 1758) in the Çanakkale Region(Çanakkale Onsekiz Mart Üniversitesi, 2024) Uğur, Gençtan Erman; Öztekin, AlkanThis study, conducted from October 2019 to September 2021 in the regions of the Çanakkale Strait and the Northern Aegean incleuding, Kepez, Kumkale, Yeniköy, Dardanos, Güzelyalı, Morto Bay, and Saros Bay. 162 individuals of the species Scorpaena scrofa examined. The total weights and lengths of the individuals were recorded. The average otolith weights of female and male individuals were found to be 0.023 g and 0.023 g, respectively (P<0.05); otolith lengths were 5.13 mm and 4.67 mm (P<0.05); and otolith widths were 2.01 mm and 1.87 mm (P<0.05), respectively. It was determined that males had smaller values than females across all three otolith biometric measurements, and these differences were statiscially significant. Additionally, there were no differences in size between the left and right otoliths (P>0.05). The lenght-weight relationship analysis indicated that the species exhibited isometric growth, with b values approaching 3.Öğe Türkiye Kıyılarında Kırlangıç Balığının (Chelidonichthys lucerna Linnaeus, 1758) Otolit Kimyası ve Otolit Şekil Analizi Kullanılarak Populasyon Yapısı(Çanakkale Onsekiz Mart Üniversitesi, 2024) Atak Sanduvaç, Sibel; İşmen, AliChelidonichthys lucerna ekonomik öneme sahip demersal bir türdür. Ülkemizde aşırı avcılık baskısı altındadır ve elde edilen miktar azalmaktadır. Türün populasyon yapısı, habitat bağlantıları hakkındaki bilgi sınırlıdır. Bu çalışmada Türkiye kıyılarında dört avlanma bölgesinde (Karadeniz/Ordu, Marmara Denizi/Bandırma, Ege Denizi/Foça ve Akdeniz/Mersin) Şubat 2020-Aralık 2020 tarihleri arasında yakalanan 160 adet bireyin otolit şekli ve kimyası incelenmiştir. Boy aralığı benzer bireylerin TL (19-25 cm, TL) otolit morfolojisi ve kimyası (Li:Ca, Na:Ca, Mg:Ca, Mn:Ca, Fe:Ca, Co:Ca, Ni:Ca, Cu:Ca, Zn:Ca, Sr:Ca, Ba:Ca, Pb:Ca, K:Ca, P:Ca) tek ve çok değişkenli istatistiksel analizlerle değerlendirilmiştir. Otolit morfolojisi ve kimyası tekniklerinin genel kombinasyonu, örneklerin orijinal konumlarına en yüksek yeniden sınıflandırma başarısını (%75-%90) ve örnekleme bölgeleri arasında önemli farklılıkların varlığını ortaya çıkarmıştır. Otolit şekil analizleri ve otolit kimyası birlikte değerlendirildiğinde dört denizden örneklenen (Karadeniz, Marmara, Ege ve Akdeniz) C. lucerna bireylerini tam olarak ayırt edebilmiştir. Ayrıca, analiz sonuçları, Marmara ve Ege denizlerindeki bireyler arasında habitat bağlantılarının bulunduğunu, C. lucerna stokları açısından Karadeniz ve Akdeniz'in izole bölgeler olduğunu ortaya koymuştur. Elde edilen şekil ve kimyasal bulgular, C. lucerna'nın Türkiye kıyılarında tek bir stok birimi olmadığını ve bu balık stoklarının balıkçılık amacıyla ayrı ayrı yönetilmesi gerektiğini göstermiştir.Öğe Chemical Composition of Two Grey Mullet Species (Chelon auratus, Mugil cephalus): A Comparative Study on Wild and Aquaculture-Adapted Species(Çanakkale Onsekiz Mart Üniversitesi, 2024) Çankırılıgil, Ekrem Cem; Altuntaş, AyçaThis study assessed the chemical composition of wild and culture-adapted golden grey mullet (Chelon auratus) and flathead grey mullet (Mugil cephalus). Wild samples were collected seasonally from Trabzon shores and compared to those adapted to aquaculture conditions for one year. Both species had high levels of glutamate, aspartate, alanine, leucine, and isoleucine. Mugil cephalus was a high protein source for adults, with a digestible indispensable amino acid score (DIAAS) score above 100 in both wild and culture forms. However, a DIAAS score exceeding 100 was only detected in wild Chelon auratus in the winter and spring. Both species had high levels of EPA and DHA, with Mugil cephalus having the highest lipid quality. Despite seasonal variations, cultured fish maintained a good nutritional profile similar to wild fish, especially in the autumn and summer.Öğe Variations Observed in the Muscle Scars of Left Valve of Pododesmus patelliformis (Linnaeus, 1761) [Bivalvia: Anomiidae](Çanakkale Onsekiz Mart Üniversitesi, 2024) Albayrak, Serhat; Çağlar, SenemThis study investigates the unusual muscle scars observed in some specimens of Pododesmus patelliformis (Linnaeus, 1761). Materials were collected between 1964 and 1977 from 18 stations across the Sea of Marmara and the Aegean Sea. In only 49 out of the 85 specimens examined (57,7%), the muscle scars were distinctly separated from each other as described in the general literature. Thirty-six specimens (42,3%) exhibited muscle scars that differed from the known pattern. These atypical muscle scar types were categorized into five types, explained, photographed, and illustrated in this study.Öğe Sade Uzatma Ağları Avcılığında Bazı Balık Türlerinde Farklı Seçicilik Analiz Yöntemlerinin Seçicilik Parametrelerine Olası Etkileri(Çanakkale Onsekiz Mart Üniversitesi, 2024) Demirdak, Çağdaş; Ayaz, AdnanBu çalışmada voli yöntemiyle uygulanan uzatma ağlarıyla avcılık sonucunda farklı seçicilik analiz yöntemlerinin seçicilik parametrelerine etkisi araştırılmıştır. Çanakkale kıyılarında farklı ağ göz genişliğindeki (20, 22, 23 ve 25 mm) uzatma ağlarıyla toplamda 31 operasyon yapılmıştır. Operasyon sonucunda avlanılan kupes (Boops boops) ve melanur (Oblada melanura) balıklarının hem Holt hem de SELECT yöntemiyle seçicilik analizi yapılmış ve seçicilik parametrelerinin farklılıkları karşılaştırılmıştır. Seçicilik analizleri sonucunda tüm ağ göz genişlikleri için Holt yöntemi sonucunda hesaplanan optimum yakalama boyları kupes balıkları için sırasıyla 20,50, 22,55, 23,57 ve 25,62 cm, melanur balıkları için sırasıyla 9,65, 10,61, 11,09 ve 12,06 cm’dir. SELECT yöntemiyle yapılan analizler sonucunda tüm ağ göz genişlikleri için hesaplanan optimum yakalama boyları sırasıyla kupes balıkları için 19,89, 21,88, 22,87 ve 24,86 cm, melanur balıkları için 13,55, 14,91, 15,58 ve 16,94 cm’dir. Seçicilik analiz yöntemlerinin karşılaştırılması için Holt ve SELECT yöntemiyle oluşturulan seçicilik eğrilerinin altında kalan alanlar (SEA) ve seçicilik aralığı değerleri hesaplanmıştır. Kupes balıklarının 20, 22, 23 ve 25 mm ağ göz genişliğinde Holt yöntemiyle oluşturulan seçicilik eğrilerinin SEA değerleri, SELECT yöntemi ile oluşturulan seçicilik eğrisinden sırasıyla %37, %25, %20 ve %10 daha büyük olduğu hesaplanmıştır. Melanur balıklarının 20,22,23 ve 25 mm ağ göz genişliğinde Holt yöntemiyle oluşturulan seçicilik eğrilerinin SEA değerleri, SELECT yöntemi ile oluşturulan seçicilik eğrisinden sırasıyla %41, %29, %24, %14 daha büyük olduğu hesaplanmıştır. Çalışma sonucunda farklı seçicilik analiz yöntemlerinin analiz sonuçlarında farklılıklara neden olduğu özellikle melanur gibi yassı balıkların seçicilik parametrelerini %40 kadar değiştirdiği belirlenmiştir.Öğe Genetic Confirmation of the Striped Eel Catfish Plotosus lineatus (Thunberg, 1787) from Iskenderun Bay (Eastern Mediterranean, Türkiye)(Çanakkale Onsekiz Mart Üniversitesi, 2024) Turan, Cemal; Ergenler, Ayşegül; Turan, Funda; Doğdu, Servet AhmetThe records of the striper eel catfish Plotosus lineatus have been assigned based on morphological characters in the Mediterranean Sea. However, molecular and genetic analyses are needed to confirm the morphological taxonomic determination and avoid misidentification. In this study, the mitochondrial cytochrome c oxidase subunit I (COI) gene region was used for genetic confirmation of Plotosus lineatus in the Mediterranean Sea. The obtained P. lineatus sequences were found to have a 100% identity match with the Red Sea and Mediterranean records. The present molecular genetic study confirms the presence of P. lineatus in Turkish marine waters. Also, this study is the first genetic confirmation of P. lineatus on the coast of Türkiye and in the Mediterranean Sea.Öğe Can DNA Barcode Study be Done from a Museum Specimen Fixed in a Formaldehyde Solution? A Case of Emys orbicularis (Linnaeus, 1758)(Çanakkale Onsekiz Mart Üniversitesi, 2024) Günay, Ulvi Kerem; Yakın, Batuhan Yaman; Pipilos, Atakan; Keskin, Emre; Tok, Cemal VarolDNA barcoding, a molecular taxonomy technique, has been increasingly used by herptile taxonomists in recent years. In DNA barcoding studies with museum specimens, there are difficulties in achieving success in specimens that have been exposed to formaldehyde, which is usually used as a fixative, for a long time and intensively. Here we studied the effect of formaldehyde on the application of the DNA barcode method in Emys orbicularis specimens stored in 4% formaldehyde and 70% ethanol solution since 2008 and 2014. Sanger sequence analysis of tissues taken from samples stored in both ethanol and formaldehyde solution successfully yielded sequences of 623 bp. In conclusion, the use of ethanol solutions should be preferred for mid or long-term sample storage, especially in the context of molecular studies. In cases where the use of formaldehyde is unavoidable, it may be advisable to use extremely low concentrations to increase success in molecular research.Öğe Van (Türkiye) İlinde Bulunan Bazı Göletlerin Su Kalite Özellikleri(Çanakkale Onsekiz Mart Üniversitesi, 2024) Demir, MuhammetBu çalışma, Sonbahar (Kasım 2022), İlkbahar (Mayıs 2023) ve Yaz (Temmuz 2023) mevsimlerinde, Van ilinde bulunan Aşağı Tulgalı, Oymaklı, Sırımlı, Morçiçek ve Sağmalı gölet sularının fiziksel ve kimyasal özelliklerini araştırmak amacıyla yapılmıştır. Arazide yerinde yapılan ölçümlerde ortalama, çözünmüş oksijen 8.70±0.77 mgL-1, su sıcaklığı 13.56±0.62°C, bulanıklık 18.09±12.57 NTU, elektriksel iletkenlik 423.67±156.37 μScm-1, tuzluluk ‰0.21±0.08 mgL-1, pH 8.77±0.18, TÇK 215.26±80.04 olarak ölçülmüştür. Laboratuvarda yapılan kimyasal analizlerde ise ortalama, Cl2 27.36±3.81 mgL-1, Ca+2 52.50±14.43 mgL-1, Mg+2 22.95±10.49 mgL-1, Ca+Mg 151.97±48.96 mgL-1, CO32- 6.21±0.92 mgL-1, HCO3- 130.61±61.39 mgL-1, NO2- 0.07±0.02 mgL-1, NO2—N 0.02±0.01 mgL-1, NO3- 3.93±2.38 mgL-1, NO3—N 0.94 ±0.56 mgL-1, NH3 0.36±0.45 mgL-1, NH3-N 0.31±0.39 mgL-1, NH4 0.38±0.47 mgL-1, PO4-3 0.10±0.10 mgL-1, P 0.03±0.04 mgL-1, SO4 102.95±32.12 mgL-1, K 2.16±1.01 mgL-1, Na 9.76±3.12 mgL-1, B 0.56±0.38 mgL-1, Toplam sertlik 20.33±10.82 mgL-1, Organik madde 1.35±0.39 mgL-1, SAR 0.29±0.07 mgL-1, Cr+6 0.001±0.001 mgL-1, Fe+2 0.032±0.023 mgL-1, Mn+2 0.075±0.129 mgL-1, Cu 0.005±0.003 mgL-1, nikel ve kobalt değerleri ölçülebilir değerin altında ve Zn 0.010±0.003 mgL-1 olarak tespit edilmiştir. Elde edilen sonuçlar ilgili su kalitesi yönetmeliklerine göre değerlendirilmiştir. Gölet suları, YSKYY ve SKKY’ye göre, pH dışındaki parametrelerin tarımsal sulamada kullanılabilecek kalitede olduğu, ASSKY’ye göre, amonyak (Sırımlı ve Morçiçek hariç) ve nitrit dışındaki parametrelerin ise sazan ve alabalık üretimine uygun olduğu belirlenmiştir.Öğe Extraction and Characterization of Acid Soluble Collagen From Golden Grey Mullet (Chelon auratus) Scale(Çanakkale Onsekiz Mart Üniversitesi, 2023) Metin Hacisa, Cansu; Baygar, TaçnurIn the present study, the potential of waste fish scales for obtaining a valuable bioactive material was evaluated. Acid soluble collagen from golden grey mullet (Chelon auratus) scales was isolated and characterized successfully. Proximate composition, denaturation temperature, Sodium dodecyl sulphate gel electrophoresis (SDS-PAGE), amino acid composition, Scanning electron microscopy and Energy dispersive X‑ray spectroscopy (SEM-EDS), Fourier transform infrared spectrophotometer (FTIR), Thermogravimetric analysis (TGA), antioxidant and antimicrobial activity analyses were performed for the extraction of collagen and extracted collagen was compared with commercial collagen. As a result, an alternative and useful source for mammalian collagen for the industrial applications like food and cosmetics was extracted from the fish scale waste material, which may help mitigate the management of natural wastes or environmental problems.Öğe Spatial and Temporal Variability of the Surface Temperature in the Black Sea Between 2000-2022(Çanakkale Onsekiz Mart Üniversitesi, 2023) Çokacar, TülayThis study presents a comprehensive assessment of the spatio-temporal variability of Sea Surface Temperature (SST) in the Black Sea at monthly to interannual scales, with a focus on understanding its connection to major large-scale atmospheric forcing during the period 2000-2022. Monthly variations of SST in the Black Sea reveal distinct seasonal patterns. The study evaluates the potential impacts of large-scale atmospheric patterns on interannual SST variations using climate indices such as the North Atlantic Oscillation (NAO), East Atlantic/West Russia (EA-WR) and El Niño-Southern Oscillation (ENSO) during the winter months. The results indicated that these large-scale atmospheric oscillations played a substantial role in influencing SST anomalies, with the NAO and EA-WR indices particularly affecting the Black Sea's SST anomalies. The NAO index exhibited negative values during warm winters and positive values during cold winters, with extreme cold and warm winters corresponding to specific years, as observed in 2003, 2006, 2012, 2017 (cold) and 2018, 2020, 2021 (warm). Notably, the relationship between NAO and SST anomalies was not as dominant during 2000-2022. This difference might be explained by the combined influence of NAO and ENSO, which is beyond the scope of this study. The EA-WR pattern was identified as another significant large-scale atmospheric dynamic affecting the Black Sea's SST. Although it explains the cold SST anomalies in certain years, it cannot account for extreme warm SST years. While the influence of ENSO remains somewhat inconclusive for the extreme warm period, the SST pattern between 2016-2022 aligns closely with El Niño events, particularly in 2018 and 2021 when positive SOI index values coincide with warm SST years in the Black Sea.Öğe Chasing Light: How Dichromatic LEDs Affect the Elemental Profile of Gongolaria barbata(Çanakkale Onsekiz Mart Üniversitesi, 2023) Yılmaz, Melis; Ak, İlknurThis study aims to investigate the influence of three different dichromatic LED light sources and varying photoperiod durations on the mineral content and trace element compositions in cultivated Gongolaria barbata under controlled culture conditions. During the experiment, red-blue (RB), blue-green (BG), red-green (RG) and fluorescent lights were examined at 16:16, 12:12, and 8:16 Light: Dark (L:D) photoperiods, and at 150 μmol photon m-2 s-1 intensity of light in all treatments. The elemental compositions of the thallus samples were analyzed for Mg, Ca, K, Na, P, Zn, Mo, Cu, Mn, Cr, Co, Cd, Fe, and As.. Our results showed that macro element and trace element compositions significantly varied among different experimental groups. Regarding the order of abundance, macroelements were ranked as follows: K > Na > Ca > Mg > P. Meanwhile, trace elements followed this order: As > Zn > Mn > Cr > Co > Cu > Cd > Mo > Fe. Among the experiment groups, the highest value of the macro elements was recorded as 1041.3±22.2 mg kg-1 for K, and the lowest value was 26.61±0.02 mg kg-1 for the P. Among the trace elements, for As, the highest value was recorded as 1339.86±5.27 µg kg -1, and the lowest was determined at 1.93±0.04 mg kg-1 for the Fe. The findings highlight that LED lighting conditions can significantly influence the elemental composition of G. barbata.Öğe Some Biological Characteristics of the Invasive Moon Crab Matuta victor (Fabricius, 1781) (Crustacea: Decapoda: Matutidae) in Karataş Coasts (Adana, Türkiye)(Çanakkale Onsekiz Mart Üniversitesi, 2023) Türeli, Canan; Leba, TamerIn this study, some biological characteristics of the invasive moon crab, Matuta victor, which has recently entered the waters of the northeastern Mediterranean, Türkiye, were investigated for the first time. The study was carried out seasonally on sandy bottoms at 0.5-3 m depths along Karataş (Adana, Türkiye) coasts between 2020 -2021. A total of 364 crabs were obtained, 93 females (27 ovigerous), 270 males and one juvenile. The carapace width of female crabs ranged between 27.49-49.30 mm with a mean of 41.55±4.01 mm. The carapace width of male crabs ranged between 21.28-66.70 mm with a mean of 49.15±8.97 mm. Mean carapace length measurements in females and males were 26.83±2.52 mm and 32.71±5.85 mm, and the mean total weights were 8.18±1.99 g and 16.27±7.30 g, respectively. The male:female ratio was 2.16:1. Morphometric relationships indicated negative allometric growth for females, males, and both sexes. Ovigerous females were obtained in all seasons except the winter. The female crabs with carapace widths that ranged between 35.31-48.84 mm and a mean of 41.97±3.29 mm had a mean fecundity of 36822.04±29745.9 eggs.Öğe Evaluation of Illegal, Unreported and Unregulated (IUU) Trawl Infringements Committed by Turkish Fishing Vessels(Çanakkale Onsekiz Mart Üniversitesi, 2023) Karabacak, Gürkan Salih; Deval, Mehmet CengizThis study analyses a highly damaging and prevalent fishing practice of trawl infringements, which is one of the crucial components of IUU fishing in Turkish waters. The raw data gathered from the Turkish Coast Guard Command (TURCG), covered 2012 – 2014 period. Data covered a total of 1040 trawl infringements, with considerable differences in trawling violations among the seas surrounding Türkiye; the Black Sea, the Sea of Marmara, the Aegean Sea, and the Mediterranean Sea. With respect to trawling infringements, the Sea of Marmara (37%) and Istanbul Strait (15%) were the hot points. The most common infringement type was trawling in a closed area (43%) and when combined with the rate of infringements on trawling during the closed season (10%), these violations accounted for 53% of spatio-temporal infringements. Regarding illegal trawling by vessel type, trawl vessels had a 44% share and non-trawlers had a share of 56%, of which included infringements by other type of fishing vessels (46%) and non-fishing vessels (10%). It was also found that infringement by vessels smaller than 12 meters in length had a share of 46%. These vessels (known as "şebeke" in Turkish), trawl illegally using small types of nets and gears in coastal waters without giving any obvious indication of fishing activity. The results of this study will be useful to policy-makers, practitioners and scientists to successfully combat trawling infringements by providing information on distribution, intensity and methods of trawl violations.Öğe Çardak Lagünü’nde (Çanakkale, Türkiye) Liocarcinus depurator (Linnaeus, 1758)’un Kan Parametreleri ile Çevresel Değişkenler Arasındaki İlişkisi(Çanakkale Onsekiz Mart Üniversitesi, 2023) Küçükballı, Hasan AliBu çalışmada, portunid yengeç Liocarcinus depurator ‘un kan değişkenleri üzerine sıcaklık, tuzluluk, pH ve doymuş oksijen gibi çevresel değişkenlerin etkileri belirlenmiştir. Çardak Lagünü'nde 4 farklı dönemde; Şubat 2020, Mayıs 2020, Temmuz 2020 ve Kasım 2020’ de toplam 50 yengeç bireyi toplanmıştır. Yengeçlere ilk olarak buzda 10 dk anestezi uygulandı ve 1mL’lik plastik bir şırınga kullanılarak her bir yengeçten yürüme bacakların koksalarından 500 μL kan örnekleri alınmıştır. Toplanan hemolenfler daha sonra santrifüj edilerek ELISA (enzime bağlı immünosorbent testi) analizi yapılmıştır. Mevsimsel değişkenlerin kan değişkenleri üzerindeki etkisi Pearson korelasyon analizi kullanılarak değerlendirilmiştir. Sıcaklık ile albümin (ALB) arasında negatif bir ilişki bulunurken, doymuş oksijen ile glukoz (GLU) ve kolesterol (CHOL) arasında negatif ilişki bulunmuştur. pH ile CHOL arasındaki ilişki de negatifti.Öğe Assessment of Potentially Toxic Element Pollution in Tributaries of Mogan Lake, Türkiye(Çanakkale Onsekiz Mart Üniversitesi, 2023) Pulatsü, Serap; Latifi, DijarIn this study, four tributaries (Başpınar, Gölcük, Sukesen and Yavrucak Creeks) of Mogan lake under anthropogenic pressure and declared as a Special Environmental Protection Area were investigated with the following goals: a) Determination of the variations in potentially toxic element concentrations (Cr, Ni, Cu, Zn, As, Cd, Hg, Pb) in the creek waters between different months (December 2002, February 2023, April 2023), b) Calculation of potentially toxic elements indexes (Heavy Metal Pollution Index-HPI and Heavy Metal Evaluation Index-HEI) in terms of irrigation water quality, based on international and national values, c) Determination of the potential ecological risk (PER) status of the creeks in terms of irrigation water quality, d) Comparison of potentially toxic element concentrations with the environmental quality standard values specified in the current “Turkish Surface Water Quality Regulation”. According to the findings; a) In terms of overall potentially toxic element levels, the creeks are ranked as follows: Başpınar Creek> Sukesen Creek>Gölcük Creek>Yavrucak Creek. The heavy metal As was identified as having the highest contribution to metal pollution and the potentially toxic element concentrations in all creeks in February and April were found to be higher compared to that in December, b) The HPI value was found to be less than 15 for all months and creeks, with the highest HPI value of 13.21 calculated in Başpınar Creek in February, c) The HEI values were found to be less than 10 (ranging from 0.02 to 0.84), indicating a low level of potentially toxic element pollution according to this index, d) In terms of irrigation water quality, all creeks exhibited a low level of PER, with the highest PER value of 13.54 belonging to Başpınar Creek, e) The detected potentially toxic element concentrations in all four creeks did not exceed the maximum EQS values provided. In this context, it has been determined that the potentially toxic element levels in creek waters, due to anthropogenic activities, are not currently causing significant pollution. However, it is noted that Başpınar Creek is at a higher risk compared to other creeks. Furthermore, because of the ongoing anthropogenic activities in the basin, long-term metal monitoring studies are important in terms of the sustainability of Lake Mogan.Öğe 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, CeydaIn 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.Öğe The Presence of the Monogenean Helminth Grubea cochlear Diesing, 1858 from Chub Mackerel (Scomber japonicus) Caught in The Çanakkale Strait, Türkiye(Çanakkale Onsekiz Mart Üniversitesi, 2023) Aldık, Ruhay; Çakır, FikretIn this study, 75 chub mackerels that were caught in the Canakkale Strait in Türkiye between October to December, 2019, were examined for the presence of parasites. The length and weight of all fish were measured and the external body area, oral cavity, nostrils, fins, and gills were examined. Gill samples were examined under a stereomicroscope and all suspicious findings were preserved in 99.99% ethanol. The mean length and weight of fish were 24.84±0.39cm and 146.01±7.16 gr, respectively. It was determined that the collected parasite is Grubea cochlear, a monogenic helminth belonging to the Mazocraeidea family. The chub mackerel, in which the specimen of G. cochlera was isolated among the gill filaments, was a female with a total length of 18.5 cm and a weight of 49.80 gr. This finding of Grubea cochlear isolated from the gills of chub mackerel is the first record of this species in this region.Öğe İzmir Körfezi (Ege Denizi) Lesepsiyen Balıkları(Çanakkale Onsekiz Mart Üniversitesi, 2023) Akyol, OkanTürkiye kıyılarından bildirilen yabancı balık türü sayısı 80'e ulaşırken, Ege Denizi kıyılarından bildirilen yabancı balık türü sayısı 44'tür. Diğer taraftan, İzmir Körfezi'nden bildirilen Lessepsiyen türü sayısı 15'tir. İzmir Körfezi'nden bildirilen Lessepsiyen balık türleri sırasıyla Saurida lessepsianus, Lagocephalus sceleratus, Siganus rivulatus, S. luridus, Scomberomorus commerson, Bregmaceros nectabanus, Champsodon vorax, Etrumeus golanii, Stephanolepis diaspros, Nemipterus randalli, Upeneus moluccensis, Hemiramphus far, Lutjanus argentimaculatus, Acanthopagrus bifasciatus, Pterois miles’tir. Bu derleme, Lessepsiyen türlerinin İzmir Körfezi'ndeki ticari balıkçılık faaliyetleri ile etkileşimini tartışmaktadır.
