The effects of water soluble fractions of crude oil on the intestine and liver of Pelvicachromis pulcher (Boulenger, 1901) (Cichlidae, Teleostei) [Ham petrolün suda çözünebilen ki{dotless}si{dotless}mlari{dotless}ni{dotless}n Pelvicachromis pulcher (Boulenger, 1901) (Cichlidae, Teleostei) bagi{dotless}rsak ve karacigeri üzerindeki etkileri]

In order to make a contribution to displaying of the harmful effects of the petrochemical production processes to our health and environment, it has been investigated the histopathological changes obseved in the intestine and hepatic tissues of Pelvicachromis pulcher, a teleost fish, after a 15-day exposure to 40% sublethal concentrations of the water-soluble fractions of crude oil, by light microscopy. Several histological alterations such as prominent ulceration, desquamation, lymphocyte infiltration and necrosis, were noted for the intestinal tissue of the crude oil exposed animals when compared with controls. The liver was also shown marked deformative changes identified as steatozis, hemorrhage, dilatation of sinusoids and pronounced hepatocellular degeneration which was specially characterized pyknotic and karyorrhetic nuclei. It was concluded that the water soluble fractions of crude oil was drastically effected both of the tissues studied, as expected

The effects of crude oil on skin histology of Poecilia sphenops (Valenciennes, 1846) (Cyprinidae, Teleostei) [Ham petrolün Poecilia sphenops (Valenciennes, 1846) (Cyprinidae, Teleostei) deri histolojisi üzerine etkileri]

As being the main energy source that is needed for all of the industrial processes, crude oil is evaluated as a widely investigated ecotoxicant. In order to identify the effects of crude oil on the skin of teleosts, Poecilia sphenops specimens were exposed to three different concentration of soluble part of crude oil (10%, 20%, 40%) at four different exposure time (24, 48, 72, 96 h); and the histopathological changes were reported. A slight epidermis corrosion and melanophore aggregation in dermis were observed at low concentration and short exposure time. As estimated, the striking effects of the crude oil; such as dermis disintegration, necrotic areas and fibrosis in subcutaneous muscle layer; were extended prominently in parallel with increasing concentrations and exposure time

The Effects of dioctyl adipate (DOA) on the liver histology of Labidochromis caeruleus Fryer, 1956 (Cichlidae, Teleostei) [Dioktil adipat'i{dotless}n (doa) Labidochromis caeruleus Fryer, 1956 (Cichlidae, Teleostei) karaciger histolojisi üzerindeki etkileri]

Although dioctyl adipate (DOA, C22H42O4) is one of the most common plasticizers that are used for polymerization, the ecotoxicological effects of it is not well known. From this point of view, aim of this preliminary investigation was to analyze the histopathological changes in the liver of Labidochromis caeruleus (yellow princess), exposed to 0.75 ppm DOA for 30 days. When compared to controls, the most prominent changes occurred in the DOA exposed group were noted as a significant steatosis (fat deposisiton), fibrosis and expanding necrotic areas. The dilatation of sinusoids and central veins, poikilocytosis, and hemorrhage were also observed. The data presented in this study shows that, DOA is a hepatotoxic chemical at least for Labidocromis caerulous