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    BIOACCUMULATION OF CADMIUM BY NILE TILAPIA Oreochromis niloticus (L.) IN THE PRESENCE OF GREEN ALGAE Cladophora glomerata (L.) Kutz.
    (Parlar Scientific Publications (P S P), 2009) Unlu, Erhan; Karadede-Akin, Hulya; Akturk, Mehmet Nuri; Yanar, Mahmut
    Accumulation of cadmium (Cd) was determined in the muscle and gill tissues of Nile tilapia Oreochromis niloticus (L.) exposed to sublethal concentrations of Cd (0.1 and 1.0 mg/L) under laboratory conditions for 15 and 30 days, in the absence or presence of green algae Cladophora glomerata (L.) Kutz. Results showed that muscles, irrespective of treatments, accumulated less Cd than gills. Cd accumulation significantly increased in both the tissues in treatment groups as compared to control groups (p<0.05), except in muscle of fish exposed to 0.1 mg/L Cd for 15 days (p>0.05). Presence of green algae did not influence accumulation of Cd in muscle. But Cd accumulation was significantly reduced in gills, in the presence of green algae, in all treatments groups, except in 0.1 mg/L Cd exposure for 15 days. In the presence of green algae, the reduced Cd accumulation in gills might be due to its uptake from the medium by the algae.
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    The effect of vitamin E supplementation on ovary and testis histopathology in Oreochromis niloticus exposed to deltamethrin
    (Taylor & Francis Ltd, 2014) Bayar, Ahmet Serhat; Bilici, Serbest; Cengiz, Elif Ipek; Satar, Ali; Yanar, Mahmut
    The effects of deltamethrin on the histology of Oreochromis niloticus testis and ovary and the protective effect of vitamin E supplementation were investigated. The fish were divided into four groups, i.e. a control group, a vitamin-E-treated group, a deltamethrin-treated group and a vitamin E+deltamethrin-treated group. In the control and vitamin-E-treated groups, the ovaries and testes were normal at the end of 7, 14, and 21 days. In the deltamethrin-treated group, deformed oocytes, atretic oocytes, melanomacrophage centers, and focal necrotic areas were noted in the ovaries. Deltamethrin also caused cell necrosis, nuclear pycnosis, decreasing number of spermatogenic cells, decreasing spermatozoa within the lumen of tubule, decreasing number of spermatocyte cells, hypertrophy and degeneration of spermatogonia cells, and increasing number of macrophages in testis. Vitamin E decreased some histopathological changes induced by deltamethrin, but did not confer complete protection.
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    The protective role of vitamin E on gill and liver tissue histopathology and micronucleus frequencies in peripheral erythrocytes of Oreochromis niloticus exposed to deltamethrin
    (Elsevier Science Bv, 2012) Kan, Yeter; Cengiz, Elif Ipek; Ugurlu, Pelin; Yanar, Mahmut
    Deltamethrin, is a commonly used pyrethroid pesticide. Vitamin E is a antioxidant that plays an important role in protecting cells against toxicity by inactivating free radicals generated following pesticides exposure. Therefore, it was evaluated whether deltamethrin induced histopathological changes and nuclear abnormalities using micronucleus test in Oreochromis niloticus, and the possible protective effect of vitamin E against deltamethrin inducing adverse effects in O. niloticus were investigated. Fish was fed with no pesticide + control diet, no pesticide + vitamin E-supplemented diet, 1.45 mu g/l deltamethrin + control diet, 1.45 mu g/l deltamethrin + vitamin E-supplemented diet for 30 days. Pesticide and diet quality made an impact on histopathological lesions. In treatments of deltamethrin, group fed with control diet showed much greater damage in comparison with group fed with vitamin E supplemented diet. Vitamin E decreased some histopathological changes induced by deltamethrin, but did not confer complete protection. Deltamethrin treatment has been shown to results in a significant increase in the frequency of micronucleus. However, coadministration of deltamethrin and vitamin E showed decrease in the frequency of micronucleus as compared to deltamethrin treated fish. Our results indicate that, the MN assay and histopathology can be used as bioassays for monitoring pollution in aquatic medium. On the other hand, it was observed that vitamin E decreased the genotoxicity and histopathological changes induced by deltamethrin. (C) 2012 Elsevier B.V. All rights reserved.
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    The protective role of vitamin E on the fatty acid composition of phospholipid structure in gill and liver tissues of Oreochromis niloticus exposed to deltamethrin
    (Academic Press Inc Elsevier Science, 2012) Cengiz, Elif Ipek; Kan, Yeter; Kizmaz, Veysi; Bashan, Mehmet; Yanar, Mahmut
    Deltamethrin is a commonly used pyrethroid pesticide. Vitamin E is a antioxidant that plays an important role in protecting cells against toxicity by inactivating free radicals generated following pesticides exposure. Therefore, in the present study, it was evaluated whether deltamethrin induced changes on the fatty acid composition of phospholipid in gill and liver tissues in Oreochromis niloticus and, the possible protective effect of vitamin E against deltamethrin was determined. Fish was fed with no pesticide+control diet, no pesticide+vitamin E-supplemented diet, 1.45 mu g/l deltamethrin+control diet, 1.45 mu g/l deltamethrin+vitamin E-supplemented diet for twenty days. Pesticide and diet quality made an impact on the fatty acid composition of phospholipid. In treatments of deltamethrin, group fed with control diet showed much greater damage in comparison with group fed with vitamin E supplemented diet. The results indicated that the deltamethrin led to an increase in the percentages of total SFAs (saturated fatty acids) and total MUFAs (monounsaturated fatty acids) and a decrease in total PUFAs (polyunsaturated fatty acids) in the gill tissues. However, coadministration of deltamethrin and vitamin E showed decrease in the percentages of saturated fatty acids and increase in the percentages of polyunsaturated fatty acids in the gill tissues. In group fed with control diet, deltamethrin led to a decrease in the percentage of SFAs and a increase in total MUFAs in the liver. Coadministration of deltamethrin and vitamin E showed increase in the percentages of polyunsaturated fatty acids in the liver tissues. These results have demonstrated that administration of vitamin E along with deltamethrin decreases the peroxidation of unsaturated fatty acids and thus protects the cell membranes. (C) 2012 Elsevier Inc. All rights reserved.