Fatemeh Abasi; Saeed Mohammad zadeh baran
Abstract
A series of specific toxicological effects including bioaccumulation of the pollutant, histological changes and influences on ovary tissue were examined in the Rutilus rutilus after the exposure to graded sublethal concentrations (10 , 30 , 50 μg Hg/L) of mercury chloride (MC). Histopathological changes, ...
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A series of specific toxicological effects including bioaccumulation of the pollutant, histological changes and influences on ovary tissue were examined in the Rutilus rutilus after the exposure to graded sublethal concentrations (10 , 30 , 50 μg Hg/L) of mercury chloride (MC). Histopathological changes, such as telangiectasis, and degenerative, can clearly be observed in the slices from the ovary exposed Roach.
A batch of Roach with the mean values of 5 cm in length and 5.5 g in mass were pre-raised in a static system, which was supplied with dechlorinated tap water and constantly aerated. The water qualities were controlled as follows: pH, 7.45; oxygen concentration, 7 mg/L; the water temperature, 21–22 ◦C. All fish were fed twice a day with a commercial ration of biomar. Reagents Appropriate amount of mercury chloride (MC, AR 98%, Merck-Schuchardt) was dissolved in a stock solution of 0.676g HgCl2/L.
Based on the 24 h LC50 value (70 ppb) obtained from the acute exposure test, a graded series (10 , 30 , 50 μg Hg/L) of mercury chloride (MC) were administered to Roach fish (Rutilus rutilus) with 48 fish per group. The chemical exposure experiments lasted for 48 , 96 and 144 hours. These designed exposure levels were sublethal, and could induce obvious alteration of tissues abnormalities and disease at the same time.
Mohamad Hosein Ebreahimi; Fatemeh Abbassi
Abstract
Skin coloration patterns in fish are of great physiological, behavioral and ecological importance, can be considered as an index of animal welfare in aquaculture and as an important quality factor for the retail value. In the present study the effect of different doses (0, 300, 400 and 1000 mg/kg of ...
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Skin coloration patterns in fish are of great physiological, behavioral and ecological importance, can be considered as an index of animal welfare in aquaculture and as an important quality factor for the retail value. In the present study the effect of different doses (0, 300, 400 and 1000 mg/kg of diet) of commercial methyltestosterone on three-dimensional characteristics of skin color appearance (lightness — L*, hue — H ◦ab and chroma —C◦ab) with a new index named Entire Color Index (ECI) were investigated. For data analyzing, because of the nature of the color factors, circular distribution was used. The lightness of the caudal fin was significantly (p<0.05) higher than body in all the doses except 1000 mg/kg. The lightness of the body area primarily decreased and then increased in 1000 mg/kg. With increasing the doses, the tendency to the redness Hue was increased. In addition we had significant difference in Hue values between body and caudal fin area. As a result, with increasing the dose of hormone, red pigments, and therefore attractiveness of the male were increased and this differences in color factors could be resulted to the increasing the retail values.
