Su Ürünleri Temel Bilimler Bölümü Koleksiyonu

Bu koleksiyon için kalıcı URI

https://hdl.handle.net/20.500.12428/2459

Listeleniyor 1 - 20 / 37

The impact of acute cold water stress on blood parameters, mortality rate and stress-related genes in Oreochromis niloticus, Oreochromis mossambicus and their hybrids
(Elsevier Ltd, 2021) Yılmaz, Sevdan; Ergün, Sebahattin; Çelik, Ekrem Şanver; Banni, Mohamed; Ahmadifar, Ehsan; Dawood, Mahmoud A. O.
This study aims to evaluated the response of Oreochromissp. to cold stress. Two experiments were conducted involving a total of 1080 juvenile Oreochromis niloticus, O. mossambicus, O. niloticus♂ × O.mossambicus♀=F1♂ × O.mossambicus ♀ (Hybrid 1; H1) and O. mossambicus♂ × O. niloticus♀ (Hybrid 2; H2). In the 1st experiment, fish were exposed to cold water (12 °C) for 24 h and then hematological parameters, serum biochemical variables, innate immune responses, antioxidant status, and liver gene expression responses (hsp70, hsp27, hsp90, hsp40, cat, sod, eef1a1 and calreticulin) were analyzed. Hematological and serum biochemical responses involved species-specific differences. At optimal temperatures (28 °C), respiratory burts activity (RBA) and myeloperoxidase (MPO) values of H1, H2 and O. mossambicus were significantly higher than O. niloticus (p< 0.05). While the RBAvalue of O. mossambicus decreased after exposure to cold water (p< 0.05), lysozyme activities of O. niloticus and H2 and MPO activities of all experimental fish increased significantly (p< 0.05). At control conditions (28 °C), cortisol levels were found to be higher in O. mossambicus than in H1 and O. niloticus (p< 0.05). A significant increase in cat and sod transcripts was observed in liver of fish being very pronounced in O. mossambicus and H2. The highest up-regulation was observed for hsp70 target where the lowest but significant up-regulation was observed for hsp90 gene. In 2nd experiment, water temperature was gradually decrease from 28 °C to 12 °C (average, 1 °C/1 h).Survival rates of H1 and H2 were found to be different compared to O. mossambicus and O. niloticus (p< 0.05) after 20 days of cold water challenge.O. mossambicus was the most cold-sensitive group, followed by the H2, H1 and O. niloticus. Our data should be carfully considered in view of the possible physiological and anti-stressor responses being species-specific in fish.
Understanding the public attitude towards sharks for improving their conservation
(Elsevier Ltd, 2021) Giovos, Ioannis; Barash, Adi; Barone, Monica; Borme, Diego; Tunçer, Sezginer
Sharks are among the oldest residents of the planet, they possess a unique value as top predators and constitute irreplaceable elements of marine ecosystems. Unfortunately, contemporary narratives widely presented in popular mainstream media have attached an utterly negative connotation to sharks, propagating an unsubstantiated and fabricated image of them as implacable and voracious predators. Recently a lot of attention is devoted to understanding the public perception towards sharks in order to promote their conservation given that a quarter of all shark species are facing extinction. This work assessed the current attitude of the public towards sharks on a global scale, utilizing modern technology through a single protocol that explored the importance of factors like culture, history, or educational level in shaping attitudes. We collected 13,800 questionnaires from 137 countries, with 25 countries presenting more than 100 answers each, representing in total 92% of the filled questionnaires. A generally positive attitude towards sharks emerged from our study, influenced significantly by several factors including knowledge and participation in marine conservation projects. Interestingly, shark attacks emerged as an important factor, with countries having high numbers of shark attacks exhibiting a highly positive attitude towards sharks, potentially because their citizens are more aware of the issue and the importance of sharks for the marine ecosystems. Guidelines for shifting public attitude towards sharks and consequently advancing shark conservation were also drawn.
Length-Weight Relationships of Elasmobranch Species From Gokceada Island in the Northern Aegean Sea
(Springer Science and Business Media Deutschland GmbH, 2021) Cabbar, Koray; Yığın, Cahide Çiğdem
Lenght – weight relationships (LWRs) were estimated for eight elasmobranchs (five sharks and three batoids) off the Gökçeada Island, Northern Aegean Sea. All specimens were collected by commercial bottom trawl at depths ranging from 120–400 m between February and November 2019. A total of 2991 individuals (1143 Scyliorhinus canicula, 110 Scyliorhinus stellaris, 795 Galeus melastomus, 575 Etmopterus spinax, 48 Squalus acanthias, 255 Raja clavata, 29 Raja miraletus, 36 Dipturus oxyrinchus) were sampled and studied. Results showed that most species had positive allometric growth and the values of parameter b ranged between 2.93 and 4.01. Furthermore, five shark (Mustelus asterias, Mustelus mustelus, Centrophorus granulosus, Hexanchus griseus, Oxynotus centrina) and eight batoid species (Dasyatis pastinaca, Gymnura altavela, Pteromylaeus bovinus, Leucoraja naevus, Rostroraja alba, Myliobatis aquila, Torpedo marmorata, Tetronarce nobiliana) were described, yet because they amounted to less than ten, only their respective descriptive statistics were determined.
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.
Farklı Bitki Ekstrakt ve Esansiyel Yağların Lakerda Örneklerinden İzole Edilen Bakteriler Üzerine Antibakteriyel Etkilerinin Araştırılması
(Çanakkale Onsekiz Mart Üniversitesi, 2023) Kahraman Yılmaz, Dilek; Berik, Nermin
In this study, the in vitro antimicrobial effects of citrus flower, clove and orange peel essential oils and ethanolic extracts on different bacteria isolated from lakerda samples were investigated. It was determined that essential oils were more effective than ethanolic extracts. Citrus flower and clove essential oils showed strong effects on Pseudomonas fluorescens, Staphylococcus pasteuri, Staphylococcus equorum, Carnobacterium mobile, Carnobacterium maltaromaticum, Vibrio hibernica and Vibrio rumoiensis. Essential oils showed the highest inhibitory effect on C. mobile. It was found that the essential oil of citrus flower and clove were effective on C. mobile at concentrations 0.00977% and 0.00488%, respectively. It was determined that citrus essential oil provided a stronger inhibition on Staphylococcus pasteuri at a concentration of 0.3125%. The clove essential oil at a concentration of 1.25% had the least effect on S. pasteuri. In this study, it was determined that the essential oils of citrus flowers and clove had strong inhibitory effects on the tested bacteria. In conclusion, our findings supports that addition of citrus flowers and clove essential oils to lakerda had positive effects with respect to food safety.
Çanakkale Mutfağında Su Ürünlerinin Yeri
(Çanakkale Onsekiz Mart Üniversitesi, 2022) Kahraman Yılmaz, Dilek; Berik, Nermin
The city of Çanakkale, located in the westernmost part of Turkey, has a unique location as being a junction between two continents and having a strait system. Çanakkale has a rich variety of seafood, which has been reflected in its cuisine throughout the history. The people of Çanakkale are proud of their local seafood cuisine with diverse presentation techniques. The rich marine biodiversity is the basis of the menus of coastal towns and villages, playing a major role in gastronomic tourism. In this context, the present study investigates local dishes such as scorpion fish soup, stuffed mussels, fried mussels, fried squid, stuffed squid, squid kokoreç, octopus salad, octopus stew, shrimp salad, shrimp stew, sardines in vine leaves, swordfish on skewers, fried horse mackerel, steamed lanternfish, roasted sea bass, which are commonly available both in local restaurants and homes. The study aims to characterize popular regional seafood dishes of Çanakkale that has endured the test of time from the past to the present.
Effect of Anisakis pegreffii (Nematoda: Anisakidae) on Biochemical and Haematological Characteristics of Chub Mackerel (Scomber japonicus Houttuyn, 1782) Caught in the Dardanelles at Çanakkale, Türkiye
(Çanakkale Onsekiz Mart Üniversitesi, 2022) Çelik, Ekrem Şanver; Kanat, Rıdvan Erdem; Dermancı, Pınar; Kahraman Yılmaz, Dilek; Turgay, Emre; Karataş, Süheyla; Yılmaz, Sevdan
Chub mackerel (Scomber japonicus Houttuyn, 1782) were obtained from the commercial fishermen in Çanakkale, Turkey, in July, 2017. We examined a total of 40 fish (20 non-infested and 20 infested) and assessed the biometric indices, haematological parameters and serum biochemical variables. The hepatosomatic index and gonadosomatic index of infested chub mackerel fish were lower than those of non-infested fish. Blood haematocrit ratio and haemoglobin concentration in naturally parasite-infested chub mackerel fish were significantly lower than those in non-infested fish. However, white blood cell counts of the parasite-infested chub mackerel fish were higher than those of healthy ones. Serum total protein, globulin, glucose, cholesterol, triglyceride, urea, chlorine and iron levels in naturally parasite-infested chub mackerel fish were significantly lower than those in non-infested fish. Moreover, serum lactate dehydrogenase, aspartate aminotransferase, alkaline phosphatase and alanine aminotransferase activities of the parasite-infested chub mackerel fish were higher than those in healthy ones. Therefore, observed variations in haematological parameters, serum biochemical variables and biometric indices influenced by the parasite, A. pegreffii, may potentially increase sensitivity of the chub mackerel, Scomber japonicus, to diseases and environmental conditions.
Çanakkale Kemer Bölgesi’ndeki Marya Ağlarının Teknik ve Operasyonal Özellikleri
(Çanakkale Onsekiz Mart Üniversitesi, 2022) Şen, Yusuf; Özekinci, Uğur
Av araçlarının teknik ve operasyonal özellikleri; av verimi ve seçicilik gibi balıkçılık parametrelerini etkilediği için, av araçlarının tanımlanması gerekmektedir. Aynı türü avlayan fakat farklı bölgelerde kullanılan av araçlarında, atadan kalma bilgiden veya av sahasından kaynaklı teknik ve operasyonal farklılıklar görülebilmektedir. Bu doğrultuda, Marmara Denizi’nin Çanakkale-Kemer Bölgesi’ndeki ticari balıkçıların kullandıkların fanyalı uzatma ağlarından marya ağlarının teknik ve operasyonal özellikleri belirlenerek, Marmara Denizi ve Çanakkale Bölgesi’ndeki önceki çalışmalar ile karşılaştırılmıştır. Eylül 2020-Eylül 2021 arasında ticari balıkçıların kullandıkları marya ağlarına ait özellikler, gözlem ve yerinde ölçümler ile kayıt edilerek değerlendirilmiştir. Yapılan değerlendirmeler sonucunda Çanakkale Kemer Bölgesi’nde, genellikle 20-70 metre derinliklerde, 3-4 güne kadar suda bekletilerek ekonomik değeri yüksek demersal (ıstakoz, sübye, pisi, dil, fener, kırlangıç, lipsoz ve bakalyaro vb.) türleri avlamak için genellikle Aralık-Mayıs arasında kullanılan ağlar, “Marya ağı” olarak tanımlanmıştır. Saha çalışmaları sırasındaki gözlemlerde ticari balıkçıların marya ağlarının 1-14 gün, ortalama 5 gün suda bekletildiği belirlenmiştir. Bölgede en çok 46 mm göz genişliğinde, kırmızı renk, 6 numara ip kalınlığı ve ortalama 51500 metre uzunluğunda marya ağlarının kullanıldığı tespit edilmiştir. Kemer Bölgesi’nde ve Çanakkale ile Marmara Denizi’nde daha önce gerçekleştirilen çalışmalarda, ticari balıkçıların kullandığı marya ağlarının tor göz genişliği, fanya göz genişliği, yükseklik göz sayıları, ip kalınlığı, renk gibi teknik özellikleri ile ağ miktarları, suda bekletilme süreleri gibi operasyonel özelliklerinin farklılaştığı belirlenmiştir. Sonuç olarak; Çanakkale-Kemer Bölgesi’ndeki yoğun kullanılan marya ağları gibi balıkçılık kaynaklarında kullanılan av araçlarının tanımlanması, av gücü ve av baskısının tespit edilmesine katkı sağlarken, uygun balıkçılık yönetim politikaları geliştirmek ve sürdürülebilir balıkçılık açısından oldukça önemlidir.
First Record of the Epizoic Octolasmis angulata (Cirripedia) on Maja squinado (Herbst, 1788) (Majoidea, Crustacea) from Çanakkale, Türkiye
(Çanakkale Onsekiz Mart Üniversitesi, 2022) Acar, Seçil; Şen, Yusuf
Some morphometric and biological characteristics of a European spider crab, Maja squinado (Herbst, 1788) caught off Aksaz region, (Biga, Çanakkale, Türkiye) were investigated. In addition, an epizoic species infesting this M. squinado specimen has been identified. The crab specimen was caught by a commercial fisherman using trammel nets. Carapace length, carapace width and weight of the crab were 15.9 cm, 14.5 cm, and 1109 g respectively. The specimen was an ovigerous female with a calculated fecundity of 3.48x104 eggs. Eggs were in stage 4th of development and covered the whole carapace region. Additionaly, it was observed that the specimen was infested with the epixoic barnacle Octolasmis angulata (Aurivillius, 1894). A total of 46 O. angulata individuals were observed; 32 from the gill lamellae, and 14 from the carapace. This study reports the existence of the epizoic O. angulata on Maja squinado for the first time in Türkiye.
Hydrochemical and Bacteriological Status of a High Altitude Karstic Cave Stream (Güvercinkaya Cave: Çanakkale, Turkey) with Aquatic Macroinvertebrates Findings
(Çanakkale Onsekiz Mart Üniversitesi, 2022) Odabaşı, Deniz Anıl; Odabaşı, Serpil; Deniz, Ozan; Çakır, Fikret; Elipek, Belgin; Arslan, Naime; Özbek, Onur; Özalp, H. Barış
Caves are laboratories for many disciplines that work in natural sciences including mineralogy, biology, hydrogeology, and archaeology. In this study, bi-monthly samplings were carried out from three smapling locations within and around the Güvercinkaya Cave, a high-altitude cave located in nortwestern Turkey, to evaluate the hydrochemical and microbiological properties and the aquatic macroinvertebrates of the cave stream. Some parameters of the water including pH, electrical conductivity, temperature, oxidation-reduction potential, dissolved oxygen were measured in-situ, while elemental (70 in total) and ionic composition of water were analyzed in the laboratory. Microbiological analyses of the cave stream were examined through analyses of total bacteria, total coliforms, fecal coliforms, fecal Streptococcus, and Escherichia coli. According to the Piper diagram of hydrochemical data, the cave stream had mainly Ca-Mg-HCO3 character, on the other hand, the Schoeller diagram indicated a common water source in Güvercinkaya cave due to the similar components of the main ionic components of the water. As a result of microbiological analysis, fecal contamination was determined, indicating an active wildlife in the cave. Additionally, several aquatic macroinvertebrates taxa, Rhynchelmis limosella, Dugesia sp., Gammarus uludagi which have non-troglobiont character were found in the cave stream. Rhynchelmis limosella detected in this study is the first record for the Turkish fauna.
Cyanobacterial Communities in Mucilage Collected from Çanakkale Strait (Dardanelles): Metagenomic Approach
(Çanakkale Onsekiz Mart Üniversitesi, 2022) Yılmaz, Sevdan; Çelik, Ekrem Şanver; Yılmaz, Dilek Kahraman; Küçüker, Mehmet Ali
In this study, cyanobacterial communities in mucilage samples collected from three stations in the Dardanelles Strait were analyzed with a metagenomic approach. Mucilage samples were collected at the beginning of June 2021 from three points of the Dardanelles (Station 1: 40°6'42.78"N, 26°23'57.00"E; Station 2: 40°9'8.09"N, 26°24'16.19"E; Station 3: 40°6 '21.62"N, 26°22'41.25"E). The dominant cyanobacteria were Prochlorococcus marinus (39.17%), Synechococcus sp. (20.85%), Lyngbya sp. (12.00%), Trichodesmium erythraeum (7.33%), Aphanocapsa sp. (4.33%) and Leptolyngbya sp. (3.33%), which constituted 87.00 % of the total number of sequences. In this study, cyanobacteria species that can cause harmful algal blooms and have toxic effects on the mucilage structure have been determined. The Marmara Sea and the Dardanelles Strait, which have been affected by serious disturbances, including industrial activities, anthropogenic impacts, tourism and artificial lighting, will never be fully restored to their former ecological state. In addition, cyanobacteria species in the mucilage may cause harmful algal blooms and have toxic effects that threaten the future well-being of coastal populations and ecosystem stability. Thus, the government and local authorities should pay more attention to combating the mucilage.
Dalyan-İztuzu (Doğu Akdeniz) Sahilinde Mikroplastik Kirliliğinin Araştırılması
(Çanakkale Onsekiz Mart Üniversitesi, 2021) Zilifli, Aytuğ; Tunçer, Sezginer
In the present study, 14 sampling stations along the Dalyan-Iztuzu beach were sampled in June and July 2019 for the examination of microplastics. Samples were taken from surface waters (0-15 cm) using a manta trawl with a towing speed of 2 knots/h and a towing duration of 20 minutes. Microplastics were separated according to their shapes, types and sizes under a binocular stereo microscope. Results indicated that, the average density of microplastics were 0.148 ±0.07 particles/m2. Microplastic densities in the present study were lower compared to those of earlier studies carried out in the other parts of Mediterranean coasts and the Sea of Marmara.
Gökçeada Kıyılarında (Kuzey Ege Denizi) Paracentrotus lividus ve Arbacia lixula Gonadlarında Metal Konsantrasyonları
(Çanakkale Onsekiz Mart Üniversitesi, 2021) Yılmaz, Melis; Tunçer, Sezginer
In this study, Pb, Cu, Zn, Cd and Fe levels in the gonads of Paracentrotus lividus and Arbacia lixula collected from the coasts of Gökçeada were determined seasonally between 2014-2015. Trace element concentrations of P. lividus from highest to lowest ranked as Zn> Fe> Cu>Pb>Cd. Trace element concentrations of A. lixula gonads from highest to lowest ranked as Fe> Zn>Cu>Pb> Cd. Trace element concentrations were statisticaly different between species and between stations and seasons. For comparison purposes in biomonitoring studies only trace element concentrations in identical tissues of sea urchins should be used. Among body tissues, gonads are recommended to be considered as biomonitor tissues, except during reproductive periods.
Biological Aspects of the Brown Ray (Raja miraletus Linnaeus, 1758) in the Saros Bay, the Northern Aegean Sea
(Çanakkale Onsekiz Mart Üniversitesi, 2021) Yığın, Cahide Çiğdem; İşmen, Ali
The present study reports the age, growth, and reproduction parameters of 52 brown rays (Raja miraletus) captured from the Saros Bay (Northern Aegean Sea) between September 2006 -2008. The males and females accounted for 44.2% and 55.8% of the sample, respectively. The males measured 10.5-53.5 cm (disc width, 6.5-32 cm) and the females ranged 25.5-47.7 cm (disc width, 18-30.5 cm) in total length (TL). The equations TW=0.0017*TL3.27 and TW=0.0017*DW3.38 were used to describe the total length-weight and disc width-weight relationships, respectively. The length-at-age data on vertebrae were used to estimate the von Bertalanffy growth equation: L∞ = 62.43 cm, K = 0.28 year−1, t0 = −0.54 year. The maximum age was found to be 4 years for both the males and females.
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.
Peracarid Crusteceans Species from Upper Infralittoral Rocky Shores of Gokceada Island (Aegean Sea)
(Çanakkale Onsekiz Mart Üniversitesi, 2019) Aslan, Herdem; İşmen, Pınar
The abundance of the peracarid crustacean fauna were studied on a spatial scale of Gokceada Island which is located Northern Aegean Sea. Samples were collected seasonally from 13 coastal stations at depth 0.1- 0.5 m, during years of 2010 and 2011. The surface was scraped by means 20 x 20 cm quadrats and sieving 0.5 mm mesh size. Result of identified and counting all peracarid species, a total of 142,906 individuals/m2 were obtained belonging to 88 species and 66 of them were new record for the island’s fauna. Amphipods were the dominant group both in terms of species Margalef richness and abundance. Ampithoe ramondi, Hyale schmidti and Elasmopus brasiliensis were the most abundant species. Number of species, density, richness, evenness, diversity of stations and similarity are also discussed.
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.
The Relationship of Bristle Worm, Protodorvillea kefersteini (McIntosh, 1869) (Eunicida, Dorvilleidae) Abundance with Environmental Variables in Çardak Lagoon (Turkish Straits) Exposed to domestic Discharge
(Istanbul University Faculty of Aquatic Sciences, 2024) Dağlı, Ertan; Ateş, A. Suat; Acar, Seçil; Büyükateş, Yeşim
This study presents the correlations between opportunistic polychatea, Protodorvillea kefersteini (McIntosh, 1869) abundance, and environmental variables in cardak Lagoon. Samplings were carried out on the bottoms using a 30x30 cm quadrate seasonally between 1 and 1.8 m depths of seven sampling points in October 2018, February, April, and June 2019. A total of 1094 specimens belonging to P. kefersteini were collected. Environmental variables such as gravel content in sediment, pH, and salinity levels in the water had the highest correlations with the abundance through the sampling periods. Considering the sampling points, the highest correlation value was between water salinity and the abundance. Sediment gravel content, pH, salinity, temperature, anionic surfactant levels, and NO2+NO3 were major environmental variables affecting P. kefersteini abundance in the study area spatially and temporally.
Exotic Polychaetes of a Sewage Pollution Influenced Lagoon (cardak Lagoon, Turkish Straits)
(MDPI, 2023) Dağlı, Ertan; Ateş, Abdullah Suat; Acar, Seçil; Büyükateş, Yeşim; Dogan, Alper; Bakır, Ahmet Kerem
This paper includes three exotic polychaeta species, Hydroides dianthus (Verrill, 1873), Polydora cornuta Bosc, 1802, and Pseudopolydora paucibranchiata (Okuda, 1937), found during benthic samplings in Çardak Lagoon (Turkish Straits). The sampling was collected from the sandy and silty bottoms known to be polluted by sewage discharges. A total of 45 specimens of exotic polychaetes (H. dianthus: 1; P. cornuta: 4; P. paucibranchiata: 40) were found. The correlation values between the annual average values of the nutrients and the polychaeta abundance showed that the highest positive relationships with the abundance were between sand content, total phosphate, and pH. P. cornuta was the most observed species with a frequency index value of 75%, while H. dianthus was represented with a single species in the study area. Albeit the previous studies, P. paucibranchiata was observed most abundantly in the sampling station having low organic matter amounts. The study showed that opportunistic polychaetes observed in Çardak Lagoon mostly preferred organically poor sediments.
Evaluation of metabolic stress status in common carp (Cyprinus carpio) exposed to the fungicide folpet
(Elsevier Inc., 2023) Acar, Ümit; Erden, Yavuz; İnanan, Burak Evren; Kesbiç, Osman Sabri; Yılmaz, Sevdan; Çelik, Ekrem Şanver
Among pesticides, fungicides are the most extensively used ones in agriculture and their effects on fish health and indirectly human health are needed to evaluate. Folpet has been used for over 50 years as a fungicide across the world. The mechanism of action of folpet on non-target aquatic organisms is so poorly understood and there is no available information about potential acute toxicity of folpet and its mechanism of action in non-target aquatic organisms. With this motivation, two successive experiments were set up: first, 96 h-LC50 value of folpet for common carp (Cyprinus carpio) was determined; and second, effects of different sublethal concentrations (0, 0.025, 0.50, 0.1 and 0.15 mg/L) of folpet on hematological serum biochemical blood parameters, DNA damages, expression levels of catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione S-transferase (GST), and cortisol receptor (HSP70) genes were evaluated in this study. It was calculated that 0.199 mg/L of folpet was the 96 h-LC50 value. After the folpet exposure for 14 days, significant decreases in red blood cells, hemoglobin, hematocrit, serum total protein, and GST gene expression levels were observed while serum glucose, liver enzymes activities, and expression levels of CAT, SOD, GPx, HSP70 genes increased. Also, folpet induced a significant genotoxic effect on the blood cells regarding to DNA damages. Consequently, the results have shown the toxic effects of folpet even at the lowest concentration on common carp.

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