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    Chronic effects of GM soybean oil on some semen characteristics of rainbow trout (Onchorhyncus mykiss W., 1792) in breeding season
    (ELSEVIER SCIENCE BV, 2012) Dogu, Zafer; Sahinoz, Erdinc; Aral, Faruk
    [Abstract Not Available]
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    Pesticide-Contaminated Feeds in Rainbow Trout (Onchorhyncus mykiss W. 1792) Aquaculture: Oxidative Stress and DNA Damage
    (ZOOLOGICAL SOC PAKISTAN, 2015) Dogu, Zafer; Sahinoz, Erdinc; Aral, Faruk; Celik, Hakim; Koyuncu, Ismail; Taskin, Abdullah; Aksoy, Nurten
    Although chlorpyrifos (CPF) is an organophosphate medium-toxicity pesticide, it is highly toxic to fish and aquatic animals This study was conducted with young rainbow trouts (n=20) raised on twelve floating cages on the Ataturk Dam Lake. The fish were divided into four groups and were fed no insecticide (control groups), 0.02, 0.04 and 0.08 mg/l CFP-contaminated feed orally for 30 days. The oxidative status of trout blood tissues and the comet assay was used to measure DNA strand breaks in blood erythrocytes. No significant differences were observed at all the doses of CFP between the values of hematocrit levels and total antioxidant status. On the other hand, there was a significant correlation of increased CFP doses with leucocyte levels (F<0.05), total oxidant status (F<0.01), oxidative stress index (P<0.05) and DNA damage (F<0.01).
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    Reproductive Characteristics of Mullet (Liza abu H., 1843) (Pisces, Mugilidae) in the Ataturk Dam Lake, Southeastern Turkey
    (CENTRAL FISHERIES RESEARCH INST, 2011) Sahinoz, Erdinc; Dogu, Zafer; Aral, Faruk; Sevik, Ramazan; Atar, Hasan Huseyin
    In this study reproductive biology of Liza abu (Pisces Mugilidae) from Ataturk Dam Lake in the Euphrates River Basin was observed. Some reproductive characteristics such as age, egg number, sexual determination, gonadosomatic index (GSI) of Liza abu (n=821) are taken into consideration. The relationship between total weight (W(t)), and total length (L(t)) and fecundity (F) were investigated during the period from January 2004 to December 2005. The ages of investigated fish ranged from 1 to 5. The ratio of the numbers of fish samples with egg (89): total of female (413): total sample of Liza abu (810) were determined as 1:4.64:910 respectively. Though the highest gonadosomatic index (GSI) of female was found in April, male's was highest in May. The relationships between the total weight (W(t)) and fecundity (number of eggs= F), total length (L(t)) and fecundity (F) of L. abu were found as F(w) = 25.5+0.00583W(t) (R(2)=0.557) and F(L) = 14.2+0.000373 L(t) (R(2)=0.496) respectively. Relationship between total weight (W(t)) and gonad weight (W(g)) in males and females were found as W(t)=38.5+2.55W(g) (R(2)=0.222) and W(t)=36.8+4.55W(g) (R(2)=0.331), respectively.
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    The Protective Effects of Curcumin on Organophosphate Insecticide Chlorpyrifos-Induced Oxidative Stress and DNA Damage in Oncorhynchus mykiss
    (Central Fisheries Research Inst, 2020) Sahinoz, Erdinc; Aral, Faruk; Dogu, Zafer; Koyuncu, Ismail; Yuksekdag, Ozgur
    The aim of this study was to determine the levels of enzymatic and nonenzymatic antioxidants and DNA damage in blood of rainbow trout (Oncorhynchus mykiss) exposed to chlorpyrifos (CPF) and the protective effects of curcumin (CUR) on CPF-induced oxidative stress and DNA damage. For this purpose, 0.5% and 1.0% of CUR was administered via the intraperitoneal route for 45 days during exposure to water containing 0.040 mg/L CPF in rainbow trout. We observed a significant decrease in total peroxide (TP), glutathione (GSH), GSH peroxidase (GPx), superoxide dismutase (SOD), catalase (CAT), paraoxonase (PON), and ferric ion reducing antioxidant power (FRAP) levels, whereas there was a significant increase in TP level in CPF-exposed rainbow trout (P<0.05). Antioxidants, depending on the dose, had relatively modest to significant effects on CPF-induced oxidative stress. Low doses of CUR also significantly increased serum FRAP levels in rainbow trout exposed to CPF (P<0.05). We observed increased comet assay levels in blood, predominantly in rainbow trout exposed to CPF (P<0.05). The amount of DNA damage induced by CPF exposure was more than that in the control. Overall, this study shows that CUR, depending on the dose, may modify CPF toxicity to a moderate or high degree in rainbow trout.