Yazar "Gundogdu, Ayse" seçeneğine göre listele

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    Effects of anthropogenic activities on nutrient parameters in the North Eastern Mediterranean Sea (Bay of Sigacik/Aegean Sea)
    (Walter De Gruyter Gmbh, 2022) Culha, Saniye Turk; Karaduman, Fatma Rabia; Gundogdu, Ayse; Baris, Kamil Emre
    This study aims to examine the physicochemical parameters of seawater (temperature, pH, salinity, dissolved oxygen, suspended particulate matter, ammonium-nitrogen, nitrite-nitrogen, nitrate-nitrogen, and phosphate-phosphorus, burnable organic matter in the sediment), and possible effects of pollution in Sigacik Bay where different anthropogenic activities are carried out. Samples of surface seawater (0 m), bottom seawater (2 m), and sediment were collected monthly from four sampling sites between September 2013 and September 2014. Annual mean nutrient values were determined as 1.6 +/- 0.14 mu g.at.NH4+-N l(-1), 0.1 +/- 0.01 mu g.at.NO2--N l(-1), 0.8 +/- 0.08 mu g.at.NO3--N l(-1), 0.7 +/- 0.08 mu g.at.PO43--P l(-1), SPM 21.4 +/- 0.33 mg l(-1). The BOM content in the sediment was 5.6 +/- 0.39%. As a result of the study, it was determined that Sigacik Bay was polluted by anthropogenic point and non-point source pollution. According to the water quality criteria, the bay was found to be in the group of polluted seawater in terms of phosphate phosphorus.
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    Effects of dietbome copper on accumulation hi the tissues and organs, growth and feed utilization of rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) Juvenile
    (2009) Gundogdu, Ayse; Harmantepe, F. Burcu; Dogan, Gaye; Karsli, Zafer; Asci, Mehtap Yagan
    The present experiment was conducted to study effects of elevated dietary Cu and establish upper limits of Cu in fish feed. Accumulation and growth of dietbome copper in the gill, muscle tissue, digestive system and whole body of rainbow trout (Oncorhynchus mykiss, Walbaum). Four experimental isonitrogenic (460 g kg-1) and isolipidic (200 g kg-1) diets were formulated. Diets were prepared by adding 0 (control), 0.1, 0.4 or 1.6 g kg-1 CuSO4.5H2O feed, respectively. Each diet was randomly assigned to triplicate groups of 576 juvenile fish whose average weight 19.97±0.048 g. Fish were fed to satiation for experimental period. After 15, 30, 45 and 60 days, the fish were sampled and Cu accumulation in the gill, muscle tissue and the digestive system were determined. The data were presented in ug of sample Dry Weight (DW). At the end of the trial, with increasing dietary Cu concentration, Cu accumulation of gill, muscle tissue, liver and the digestive system were increased. However, accumulation of gill were not significant (p>0.05) in the fish fed with 0.4 (D 3) and 1.6 (D 4) g kg-1 CuSO4.5H2O diets. Accumulation of muscle tissue were not significant (p>0.05) in the fish fed with 0 (D 1) and 0.1 (D 2) g kg-1 CuSO4.5H2O diets. The accumulation of Cu in the digestive system increased with increasing dietary Cu concentration and at periyot were significant (p<0.05) in group fed with the highest Cu concentration diet. © Medwell Journals, 2009.
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    Effects of supplementing the rainbow trout (Oncorhynchus mykiss) diet with Spirulina and Chlorella on the tissue's cadmium detoxification capacity, growth performance, fatty acid composition, antioxidant defense system and liver histology
    (Elsevier, 2025) Harmantepe, Fatma Burcu; Gundogdu, Ayse; Karsli, Zafer; Sagir, Dilek
    This study aimed to determine the effects of the addition of Spirulina and Chlorella of the diets of rainbow trout (Oncorhynchus mykiss) on their growth, nutrient composition, the parameters of their antioxidant defense systems, liver histology, and the cadmium removal process of their tissues. Fish with an average weight of 84.25 +/- 3.55 g containing Cd in their tissues were distributed in 15 tanks with 18 fish per tank. The fish were fed diets consisting of 0% (Control-1), 0% (Control-2), 4% Chlorella, 4% Spirulina and Chlorella +2% Spirulina twice a day until they were satiated for a period of 80 days. At the conclusion of the experiment, it was determined that diets containing microalgae demonstrated increased growth rates, and that the growth values obtained from the 4% Spirulina and the Control-1 were similar (p > 0.05). Regarding the fatty acid content, with the addition of microalgae to the diet, a significant (p < 0.05) decrease in SFA values and a significant (p < 0.05) increase in PUFA values were observed compared to the groups Control-1 and Control-2. On days 40 and 80, Cd levels in the muscle and liver tissue of the fish were found to be significantly (p < 0.05) lower in the groups that were fed diets containing microalgae in comparison with the Control-2 group. On days 40 and 80, the SOD, CAT, GSH, GST, and GPx values of liver tissues were higher (p < 0.05) than those of the Control-2 group. As a result of the semiquantitative histopathological evaluation of the liver tissues, improvements were observed in all groups containing microalgae; however, the most remarkable improvement was achieved in the Spirulina group. The results obtained in the study revealed that the addition of microalgae to rainbow trout feed removed Cd from liver and muscle tissues, reinforced the antioxidant defense system parameters, and increased growth. However, when the groups containing microalgae were compared among themselves, the diets containing 4 % Spirulina and 2 % Chlorella +2 % Spirulina were found to be more effective on these parameters.
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    Elimination of copper in tissues and organs of rainbow trout (Oncorhynchus mykiss, Walbaum, 1792) following dietary exposure
    (Taylor & Francis Ltd, 2011) Gundogdu, Ayse; Harmantepe, F. Burcu; Karsli, Zafer; Dogan, Gaye
    Copper (Cu) elimination was investigated in the tissue and organs of rainbow trout (Oncorhynchus mykiss, Walbaum, 1792), after Cu-free diets exposure. In the current study, fish were fed to satiation on diets containing 0.022 (Group 1; Control), 0.043 (Group 2), 0.123 (Group 3), 0.424 (Group 4) g Cu*kg(-1) diet for 60 days before elimination experiment. A total of 288 fish (mean weight 84.28 +/- 1.05 g) were randomly transferred to 12 fibreglass tanks. The fish were fed the Cu-free diet twice daily, until apparent satiation, during 60 days. Subsequently, the experiment was established for a period of elimination, during which samples were taken at days 15, 30, 45 and 60. Cu concentration in the muscle, gill tissue, digestive system, liver and whole body of fish were determined after 60 days depuration. Cu concentrations in tissues of rainbow trout decreased during depuration period, and the order of Cu elimination in tissue and organs of rainbow trout was: digestive system (73.1 %), then gill (41.1 %), muscle (31.5 %) and liver (17.2 %) for group 2; digestive system (74.1%), then muscle (65.8%), gill (60.0%) and liver (34.6%) for group 3; and digestive system (85.8%), then muscle (80.8%), liver (50.5%) and less/equal in gill (50.2%) for group 4. In statistical analysis, both groups and time were significant factors (P<0.05) on elimination rate. Moreover, significant interaction between groups and time were identified on elimination rate. Digestive system showed the fastest elimination rates of Cu at all groups compared with other tissues.
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    Heavy Metal Accummulation in Muscles and Total Bodies of Mullus barbatus, Trachurus trachurus and Engraulis encrasicolus Captured from the Coast of Sinop, Black Sea
    (Zoological Soc Pakistan, 2016) Gundogdu, Ayse; Culha, Saniye Turk; Kocbas, Fatma; Culha, Mehmet
    The levels of heavy metals viz., Cd, Cu, Fe, Ni, Pb, Zn and Al were determined by ICP-AES in the muscles and total bodies of Mullus barbatus (Linnaeus 1758), Trachurus trachurus (Linnaeus 1758), Engraulis encrasicolus (Linnaeus 1758) captured from the coast of Sinop. The order of the levels of the heavy metals in the total fish samples was Fe > Zn > Al > Pb > Cu > Ni > Cd, whereas in the muscles, the order was Zn > Fe > Cu > Al > Pb > Ni > Cd. The experiment results are discussed by comparison with literature values.
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    The seasonal distribution of heavy metals in Mussel sample from Yalova in the Marmara Sea, 2008-2009
    (Springer, 2011) Culha, Saniye Turk; Kocbas, Fatma; Gundogdu, Ayse; Baki, Birol; Culha, Mehmet; Topcuoglu, Sayhan
    Concentration of the some heavy metals (Co, Cu, Fe, Ni, Pb and Zn) Mediterranean mussel Mytilus galloprovincialis from Yalova (Marmara Sea) were investigated seasonally. The mean concentrations of Co, Cu, Fe, Ni, Pb and Zn in the soft tissues were 4.08 +/- 0.67, 5.54 +/- 0.59, 156.72 +/- 20.18, 3.71 +/- 1.14, 2.92 +/- 0.51 and 106.23 +/- 5.66 mg kg (-aEuro parts per thousand 1) dry weights, respectively. There were no significant differences between the metal concentrations among the seasons (P > 0.05). The mean Pb and Zn concentrations were higher than the acceptable limit proposed by International Turkish standards.