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    Öğe
    Heavy metal levels in mullet, Liza abu (Heckel, 1843) (Mugilidae) from the Tigris River, Turkey
    (Birkhauser Verlag Ag, 1996) Unlu, E; Akba, O; Sevim, S; Gumgum, B
    The heavy metal levels in the muscle, liver, gonad, gill and intestine of mullet (Liza abu) from the Tigris River in Turkey were studied. The average levels showed that concentrations of Co, Ct, Cu, Mn, Ni and Zn in the mullet varied depending on different organs. Cd and Pb were not detected while Co was detected only in intestine samples. Cr, Cu, Mn. Ni and Zn were found in all the samples analyzed. All the fish samples contain high concentrations of Co, Cr, Cu, Mn, Ni and Zn. The high concentrations of heavy metals may be directly related to the contamination of the Tigris River by a copper plant.
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    Öğe
    Sublethal effects of commercial deltamethrin on the structure of the gill, liver and gut tissues of mosquitofish, Gambusia affinis
    (Elsevier Science Bv, 2006) Cengiz, EI; Unlu, E
    The histopathological effects of deltamethrin on the gill, liver and out tissues of the mosquitofish, Gambusia affinis were determined by light microscopy. The fish were exposed to two Sublethal concentrations of deltamethrin (0.25-0.50 mu g/l) for periods of 10, 20 and 30 days. The most common gill changes at all doses of deltamethrin were desquamation and necrosis. Besides, epithelial hypertrophy, lifting of the lamellar epithelium, oederna, dilatation of the capillaries primary lamellae, aneurism, epithelial hyperplasia and fusion of the secondary lamellae were other histopathological effects. Hepatic lesions in the liver tissues of fish exposed to deltamethrin were characterized by hypertrophy of hepatocytes, significant increase of kupffer cells, circulatory disturbances, focal necrosis, fatty degeneration, nuclear pycnosis and narrowing of sinusoids. Infiltration of mononuclear leucocyte and eosinophils towards lamina propria, necrosis were detected in gut tissues of fish after exposure to deltamethrin. (c) 2005 Published by Elsevier B.V.