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    Cypermethrin-induced histopathological and biochemical changes in Nile tilapia (Oreochromis niloticus), and the protective and recuperative effect of ascorbic acid
    (Elsevier Science Bv, 2009) Korkmaz, N.; Cengiz, E. I.; Unlu, E.; Uysal, E.; Yanar, M.
    The objective of this study was to investigate the effects of ascorbic acid on the toxicity of cypermethrin's on histopathological lesions in tissues and protein, glycogen levels in Oreochromis niloticus. Nile tilapia was exposed to 0.22 and 0.44 mu g/l cypermethrin + control diet. 0.22 and 0.44 mu g/l cypermethrin + ascorbic acid supplemented diet for 20 days. The fish were allowed recuperation period of 15 days in pesticide-free water and fed with ascorbic acid suplementation diet. In light microscopic investigation, histopathological lesions were observed in the gill, liver and kidney. The severity of lesions accreted depending on increased pesticide concentration and control diet. Some of the lesions were reversible or at least were less pronounced after recuperation period. Protein levels decreased in some groups after treatment period according to control groups (p < 0.05). The highest depletions in liver, muscle and gill protein levels were found in 0.44 mu g/l cypermethrin + ascorbic acid supplemented diet group (62.23%), in 0.22 mu g/l cypermethrin + control diet group (53.12%) and in 0.44 mu g/l cypermethrin + control diet group (61.87%) after 10 days, respectively. These levels increased at the end of the recuperation period. The highest depletion in liver glycogen levels was found in 0.22 mu g/l cypermethrin + control diet group (50.50%) after 10 days (p < 0.05). At the end of recuperation period, there was no difference between the groups (except 0.22 mu g/l cypermethrin + ascorbic acid supplemented diet group) and controls. The decrease of muscle glycogen, except 0.22 mu g/l cypermethrin + ascorbic acid supplemented diet group, was recorded at the end of 10 and 20 days. In the recuperation period, an increase was observed at all groups. These results revealed that the histopathology, protein and glycogen can work as good indicators of stress of a toxicant on fish. Ascorbic acid serves fish as an antitoxic agent against pesticide toxicity. (C) 2009 Elsevier B.V. All rights reserved.
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    The effects of monocrotophos to different tissues of freshwater fish Cirrhinus mrigala
    (Springer, 2007) Velmurugan, B.; Selvanayagam, M.; Cengiz, E. I.; Unlu, E.
    The histopathological effects of monocrotophos on the gill, kidney and intestine tissues of the Cirrhinus mrigala were determined by light microscopy. The changes in the gills were characterized by epithelial hyperplasia, aneurism, epithelial necrosis, desquamation, epithelial lifting, oedema, lamellar fusion and curling of secondary lamellae. Pycnotic nuclei in tubular epithelium, hypertrophied epithelial cells of renal tubules, contraction of the glomerulus and expansion of space inside the Bowman's capsule were observed in the kidney tissues of fish after exposure to monocrotophos. In the intestine tissues of fish exposed to monocrotophos, oedema, necrosis and atrophy of epithelial cells were observed.
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    Karyotype of mullet Liza abu Heckel, 1846 (Pisces: Mugilidae) from the Tigris River, Turkey
    (Wiley, 2013) Deger, D.; Unlu, E.; Gaffaroglu, M.
    [Abstract Not Available]
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    Observation on the age, growth and somatic condition of Carasobarbus luteus (Heckel, 1843) and Capoeta trutta (Heckel, 1843) (Cyprinidae) in the Tigris River, Turkey
    (Iranian Fisheries Science Research Inst-Ifsri, 2017) Bilici, S.; Cicek, T.; Unlu, E.
    This study was carried out to determine some biological characteristics including age, growth and somatic condition of Carasobarbus luteus and Capoeta trutta in the Turkish part of the Tigris River. The examined samples of C. luteus were distributed between II-IX years of age. The length-weigth relations of females and males were calculated as Log W =-4.7314 + 3.0113 Log FL and Log W = -4.7631 + 3.0263 Log FL respectively. Von Bertalanffy growth equations were estimated as Lt= 40.09 [1-e (-0.087036) ((t+ 1.55004))] for females and Lt= 38.14 [1-e (-0.080056) ((t+ 2.34838))] for males. The somatic condition was 1.9667 +/- 0.1751 for females and 1.9967 +/- 0.4205 for males. The observed samples of C. trutta were distributed between I-VI years of age. The lengthweigth relationship of females and males were calculated as Log W = -4.6845 + 2.9303 Log FL, Log W = -4.7784 + 2.9746 Log FL, respectively. Von Bertalanffy growth equations were estimated as Lt= 35.36 [1-e (-0.082817) ((t+ 4.82738))] for females and Lt= 28.82 [1-e (-0.12380) ((t+ 4.40235))] for males. The somatic condition in female and male individuals were determined as; 1.4434 +/- 0.1682 and 1.4722 +/- 0.1984 respectively. Both species are economic fish in the Tigris River. Biological characteristics of the species determined in the present study, may contribute to a better understanding of the life cycle, thus providing useful data for its conservation and management.
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