a bacterial septicaemia occurred in 3-female oscars (astronotus ocellatus) of about 2-year old held in 300l freshwater aquaria in south tehran. the external signs of infected fish consisted of lethargy, anaemia, distension (clinical dropsy), exophthalmia and cataract. internally there was a large amount of red-ascitic fluid accumulated in the abdominal cavity with haemorrhages/ hyperaemia of in...

In April and June 2014, mortalities of goldfish occurred at Korea. The principal signs included pale gills, severely enlarged softened spleen kidney red liver. Moreover, the histopathological characteristics observed mainly in hematopoietic tissues kidney, gill lamellae intestine. predominant changes were severe necrosis tissue. addition, nucleus exhibiting peripherally displaced chromatin part...

The glutathione S-transferases are important enzymes in the microcystin-induced detoxication processes. In this experiment, we cloned the full-length cDNA of alpha, pi and theta-class-like glutathione S-transferase genes from goldfish (Carassius auratus L). Their derived amino acid sequences were clustered with other vertebrate alpha, pi and theta-class GSTs in a phylogenetic tree and the goldf...

Chromium (Cr) is an abundant element in the Earth's crust. It exhibits various oxidation states, from divalent to hexavalent forms. Cr has diverse applications in various industrial processes and inadequate treatment of the industrial effluents leads to the contamination of the surrounding water resources. Hexavalent chromium (Cr (VI)) is the most toxic form, and its toxicity has been associate...

The purpose of this work was to evaluate the response of the antioxidant system of goldfish Carassius auratus during anoxia and reoxygenation. The exposure of goldfish to 8 h of anoxia induced a 14% decrease in total glutathione levels in the kidney, although the liver, brain, and muscle were unaffected. Anoxia also resulted in increases in the activities of liver catalase, brain glucose-6-phos...

lead is one of the heavy metal that is very toxic for environment and organisms. lead can inhibits many physiological processes and it is so dangerous for body tissues. in this study, four groups of fish (carassius auratus) 35 in each, were used for experiment. group 1 was as control, in group 2 fishes were exposed to lead acetate at concentration of 8. 5 mg/l, fishes in group 3 and 4 were also...

Hexavalent chromium [Cr (VI)] is a constituent of chromite ore. Although it is known to have several industrial and technological applications, its release into the aquatic environment as a result of chemical spill or inadequate waste discharge may hamper the health of aquatic organisms. In this study, we have investigated the effects of Cr (VI) on multiple biomarkers responses in goldfish unde...

organophosphate insecticides such as diazinon are common to control pests in many agricultural fields that are located in the vicinity of fresh water resources. in this study male goldfish were exposed for 10 days at concentrations of 3 and 6 mg/ l diazinon (granules 10%) and after that histopathological effects of diazinon on some fish tissues were examined by light microscope. according this ...