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Öğe Bioaccumulation monitoring of chemical contaminants in mussels Mytilus galloprovincialis from the southern coast of the Marmara Sea, Turkey(Tubitak Scientific & Technological Research Council Turkey, 2020) Colakoglu, Serhat; Kunili, Ibrahim Ender; Colakoglu, FatmaMytilus galloprovincialis, the Mediterranean mussel, is an important shellfish species that constitutes the majority of production and consumption among bivalve mollusks in Turkey. Since shellfish can accumulate toxic chemicals from seawater, it is important to monitor bioaccumulation from their natural beds. For this reason, in this study, the aim was to monitor the levels of dioxins and dioxin-like polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and toxic metals (Pb, Cd, and Hg) in M. galloprovincialis collected from the southern coast of the Marmara Sea from 2014 to 2017. According to the results, the maximum levels of dioxins, PAHs, and toxic metals during the monitoring period were determined as 0.30 pg/g, 2.52 mg/kg, and 0.43-0.34-0.76 (Pb-Cd-Hg) mg/kg, respectively. Dioxin, PAHs, and toxic metal amounts in mussel samples were determined to be below the threshold levels enforced by the European Commission. The highest benzo(a)pyrene and total PAHs were determined in winter 2015, while toxic metals, dioxins, and dioxin-like PCBs (WHO/PCDD/F-PCB-TEQ) were higher in autumn 2014 than the rest of the sampling period. In conclusion, toxic chemicals monitored in M. galloprovincialis were found at low concentrations from the point of view of food safety. However, monitoring of these or other toxic chemicals should be repetitively performed in the future to ensure food safety in aquatic animals.Öğe Chemical and Microbiological Quality of the Chamelea gallina from the Southern Coast of the Marmara Sea in Turkey(Kafkas Univ, Veteriner Fakultesi Dergisi, 2010) Colakoglu, Fatma Arik; Ormanci, Hasan Basri; Kunili, Ibrahim Ender; Colakoglu, SerhatThe aim of this work was to analyze Chamelea gallina harvested in the Sea of Southern Marmara in terms of heavy metal, biotoxin, and microbiological contents. Samples were collected seasonally from five stations which were determined to be their natural habitats in the between February 2008 and January 2009. Heavy metal contents of the samples revealed statistically significant (P<0.05) differences between seasons and stations. In two stations, Pb and Zn content of the clams were determined to exceed legal limits imposed by Turkish Fisheries Regulation and EC Shellfish Hygiene Directive (91/492/EEC). Biotoxin was not detected in any sample analyzed and the counts of Escherichia coli and fecal coliform bacteria of the samples were lower than the legal limits. Salmonella spp. was not detected in the sampling stations, whereas Vibrio parahaemolyticus was isolated in two stations. In conclusion, clams harvested in the southern Marmara Sea, excluding Gelibolu and Karabiga stations, were found suitable for human consumption.Öğe Depuration Times of Donax trunculus and Tapes decussatus(Springer, 2014) Colakolu, Fatma Arik; Cardak, Mine; Colakoglu, Serhat; Kunili, Ibrahim EnderThe present study was performed to determine the depuration time and ability of Donax trunculus (Wedge Clam) and Tapes decussatus (Carpet Shell) contaminated with Escherichia coli, Salmonella enterica subsp. enterica serovar Typhimurium and Vibrio parahaemolyticus. Clams were contaminated with each bacterium at the level of 7.0-8.0 Log(10) cfu/g. After contamination, clams were analyzed every 3 h in the first 24 h time period and every 6 h until the 72nd hour. During the depuration process of both clams, the level of bacteria decreased quickly to 40% of initial load in the first 12 h. The results of this study indicate that the depuration time of carpet shells for all bacteria is 66 h. The depuration process of the wedge clam was different from the carpet shell; S. typhimurium and E. coli can be depurated in 66 and 78 h, respectively, while V. parahaemolyticus was present after 72 h at the level of 1.7 Log(10) cfu/g.Öğe Distribution of macrozoobenthic invertebrates in the South Marmara Sea(2010) Palaz, Mustafa; Colakoglu, Serhat; Yildiz, HarunA study was undertaken between 2007-2009 in the Dardanelles. Monthly sampling was carried out in 4 stations up to 10m of water depths by using dredge. The samples were fixed and preserved in 5% formalin prepared in marine water. Morever, anatomical and morphological characteristics of identified species were illustrated with photographs. The specimens were examined the macroscopic and then microscopic under the light of binocular microscope. According to the results; total of 22 species belonging to 7 Order, 5 Kalssis was found in the South Marmara Sea. © Medwell Journals, 2010.Öğe Distribution of Macrozoobenthic Invertebrates in the South Marmara Sea(Medwell Online, 2010) Palaz, Mustafa; Colakoglu, Serhat; Yildiz, HarunA study was undertaken between 2007-2009 in the Dardanelles. Monthly sampling was carried out in 4 stations up to 10 m of water depths by using dredge. The samples were fixed and preserved in 5% formalin prepared in marine water. Morever, anatomical and morphological characteristics of identified species were illustrated with photographs. The specimens were examined the macroscopic and then microscopic under the light of binocular microscope. According to the results; total of 22 species belonging to 7 Order, 5 Kalssis was found in the South Marmara Sea.Öğe GROSS PATHOLOGY, BLOOD CHEMISTRY, LIPID AND PEROXIDE CONTENTS IN RAINBOW TROUT (ONCORHYNCHUS MYKISS WALBAUM) AFFECTED BY EXPERIMENTAL ARCOBACTER CRYAEROPHILUS INFECTION AT LOW WATER TEMPERATURE(Akademiai Kiado Zrt, 2009) Aydin, Seyit; Gure, Hayati; Cakici, Hasan; Colakoglu, Serhat; Bircan, RecepArcobacter cryaerophilus was isolated from naturally infected rainbow trout (Oncorhynchus mykiss Walbaum), and its pathogenicity was tested by intramuscular injection using healthy 1-year-old rainbow trout under cold-water conditions (at 5 degrees C). The lethal dosage of 50% end point (LD50) for A. cryaerophilus was calculated as 7.79 x 10(5) viable cells. Experimental infection caused gross clinical abnormalities such as fallen scales, exophthalmia, oedema in injection region and at the base of fins, pale gills, kidney necrosis, hyperaemic areas in pale liver, haemorrhagic spots in heart, elongated spleen and swollen gallbladder. Activities of aspartate aminotransferase and alkaline phosphatase, and concentrations of glucose, total protein, albumin, cholesterol, triglyceride and calcium in the serum of the experimentally infected rainbow trout were significantly decreased compared with the healthy fish. Positive correlations were observed among blood parameters. Total lipid weights increased in the brain, muscle and liver tissues of infected fish and dropped in the gill and spleen tissues. Lipid peroxide contents in the brain, liver, kidney, spleen, muscle and gill tissues of infected rainbow trout were significantly higher than in healthy animals. The present work shows that A. cryaerophilus can be moderately virulent for rainbow trout at low water temperature, and changes in lipid and lipid peroxide contents of tissues and blood indices can highlight barely detectable effects of A. cryaerophilus infection in rainbow trout under laboratory conditions. However, the application of these indices in farm biomonitoring using rainbow trout will need more detailed studies and a careful consideration of the environmental parameters.Öğe POPULATION STRUCTURE OF WEDGE CLAM, DONAX TRUNCULUS (BIVALVIA, DONACIDAE), IN THE SOUTHERN SEA OF MARMARA, TURKEY(Parlar Scientific Publications (P S P), 2019) Colakoglu, Serhat; Yildirim, Pinar; Cardak, Mine; Ihsanoglu, Mukadder ArslanThe growth, reproduction, and density of wedge clam (Donax trunculus) were studied at a depth of 0.5-2 m in Denizkent in the Southern Sea of Marmara, Turkey. Samples were collected monthly between May 2017 and July 2018. The average density of the studied population ranged between 118 individuals m(-2)(November) and 245 individuals m(-2) (July). von Bertalanffy growth parameters using the length-frequency distribution of Donax trunculus were estimated at L-x = 43.85 mm and the rate at which the asymptotic length (L-x) is approached (K) = 0.73y(-1). The slowest growth period was in Janu- ary. Growth performance index, potential longevity and maximum length derived from seasonal parameters were calculated as 3.15, 4.11 y and 42 mm, respectively. The growth pattern showed negative allometric growth (slope [b] = 2.71), the spawning period occurred from April to July and peaked between May and June.Öğe Proximate and Elemental Composition of Chamelea gallina from the Southern Coast of the Marmara Sea (Turkey)(Humana Press Inc, 2011) Colakoglu, Fatma Arik; Ormanci, Hasan Basri; Berik, Nermin; Kunili, Ibrahim Ender; Colakoglu, SerhatThe venerid clam Chamelea gallina is a popular and economic foodstuff around the Mediterranean countries especially in Italy, Spain, and France. The aim of this study is to evaluate the nutritional quality of striped venus of Southern Marmara. Samples were harvested seasonally at five stations and analyzed to determine meat yield, proximate, and elemental composition. According to the results, meat yield ranged from 20.24% to 29.94%. Means of water, protein, lipid, and ash content were 67%, 10.12%, 2.57%, and 1.66%, respectively. The mean concentrations (mg/kg wet weight) of elements in tissues are as follows: B: 2.37-4.24; Cr: 0-0.76; Co: 0-0.43; Cu: 0.71-5.30; Mn: 0.30-5.94; Zn: 13.08-77.76; Ni: 0-1.22; Fe: 2.46-114.22; Al: 1.23-75.49; Pb: 0.18-3.24; Ba: 0.66-15.97; Cd: 0.04-0.69. Among the reported metal levels, only Pb and Zn in two stations exceeded the maximum critical concentrations enforced by Turkish legislation and European Commission. Therefore, we report that striped venus from Southern Marmara Sea, in general, are safe for human consumption; nonetheless, Pb and Zn levels should be closely monitored in the future.Öğe Seasonal variations and human health risk assessment of trace elements in the bivalve ecosystem in the Sea of Marmara(Taylor & Francis Ltd, 2022) Yildirim, Pinar; Cardak, Mine; Colakoglu, Serhat; Turker, Gulen; Ormanci, Hasan BasriTwelve trace elements were studied in four economically important bivalve molluscs (Mediterranean mussel, manila clam, striped venus clam, and truncated wedge clam) from the southern Marmara Sea for seasonal bioaccumulation and human health risk assessment. According to the findings, Fe and Zn were the most accumulative and element concentrations changed considerably (P < 0.05) between seasons and species. Daily, weekly, monthly intake and target hazard quotients of the trace elements were estimated and compared with maximum limits. The results revealed that consuming these bivalve molluscs from the southern Marmara Sea could be considered safe for human consumption. Nevertheless, further monitoring is needed in order to better follow the development in time of elemental pollution due to increasing environmental pressure on the Marmara Sea basin, together with research on other different bioaccumulative organisms.Öğe Some population parameters of Ruditapes philippinarum (Bivalvia, Veneridae) on the southern coast of the Marmara Sea, Turkey(BMC, 2014) Colakoglu, Serhat; Palaz, MustafaRuditapes philippinarum, a venerid clam, is a dominant species in the sandy and muddy areas in the coastal waters of the Marmara Sea. Intensive commercial harvesting of this species is conducted in these regions. We studied the population dynamics of R. philippinarum on the southern coast of the Marmara Sea (Bandirma). Samples were collected on a monthly basis between September 2012 and August 2013. Seasonal von Bertalanffy growth parameters using the length-frequency distribution of R. philippinarum were estimated at L-infinity = 67.50 mm and K = 0.33 year(-1), and the seasonal oscillation in growth rate was 0.53. The slowest growth period was in January. The growth performance index and potential lifespan were 3.182 and 8.06 years, respectively. The growth relationship was confirmed to have a positive allometric pattern. The average total mortality rate was estimated to be 0.777 year(-1), whereas the natural and fishing mortality rates were 0.539 and 0.238 year(-1), respectively. The current exploitation rate of R. philippinarum was 0.306. The recruitment pattern peaked during June-August, and spawning occurred between May and August. The results of this study provide valuable information on the status of R. philippinarum stocks.Öğe Stuffed mussels in Turkish culinary culture: Ottoman Empire period(Ege Univ, Fac Fisheries, 2022) Colakoglu, Fatma; Yuzgec, Ibrahim Ulas; Colakoglu, SerhatFood and nutrition habits of societies are mostly shaped depending on the geography they live in and settle in their cultures over time. It is seen that the food culture of the Turks is shaped by the changing geography, climate, local products and various cultural interactions. Stuffed mussels is a type of street food that entered Turkish culinary culture during the Ottoman Empire. In fact, dolma is a name given to vegetables and fruits stuffed with rice, bulgur, meat, nuts, peanuts and spices, but in Turkish cuisine, this dish is served with almost all kinds of main ingredients; meat, chicken, seafood, vegetables, etc., can be made. Stuffed mussels is a unique flavor and practical product obtained by stuffing with a mixture of rice and spices. This product, the style of manufacture and content of which may vary slightly depending on the manufacturer, has become identical to Istanbul, its birthplace, and has come from the Ottomans to the present without slowing down.Öğe The fishing gear used in commercial bivalve fishery in Turkey(Ege Univ, 2017) Colakoglu, Serhat; Tokac, AdnanIn this study, general characteristics and technical features of the gear used in the commercial fishery of bivalve molluscs are evaluated in the coastal areas West Black Sea, Marmara Sea and Aegean Sea of Turkey. Bivalve fisheries are assessed in three main sections by dive fishing, man power coast fishing and boat power fishing, and 8 types are determined fishing gear and methods. A total of 57 various types gears of which eight wedges, five hand rake, eight hand shovel, thirteen hand dredges, three oyster's dredges, four mussel's dredges, nine mechanical dredges and seven hydraulic dredges were identified in the research areas.
