Histopathological study of gill and skin of carassius auratus and ptreophyllum sp. In Abadan and Khorramshahr

According to increasing of interest to ornamental fish in Iran and in the world، health and treatment is coming important in these species. In the current study، parasitic infestation and histopathological lesions in two popular and general scpecies of ornamental fish، goldfish (Carassius auratus) and angelfish (Ptreophyllum sp.) was studied by using two methods، wet mount and histopathology. In this research، totally of 40 fish، 20 goldfish and 20 angelfish with symptoms of disease، including anorexia، inactivity and lethargy، were selected from 10 aquarium shops in Abadan and khorramshahr and transferred to the laboratory. Wet mount was prepared from skin and gill of all fish. Then histopathological sections were prepared and stained with H&E and studied by light microscopy. Based on the results، different percentage of parasitic infestation to Dactylogyrus، Ichthyophthirius multifiliis، Chillodonella، Argulus and trichodina were observed. Histopathological alteration such as hyperplasia، clubbing of gill filaments، telangiectasia، edema، hemorrhagia and epitheliocystis were seen. Also، different sections of parasites were seen in 11 goldfish and two angelfish، respectively. In five cases، no parasitic infestation was seen in wet mount but they have been diagnosed by histopathology. Results obtained from this study showed that histopathological study may more effective than wet mount for diagnosis of parasitic infestation and lesions which have been observed are in related to adverse and unfavourable conditions and parasitic infestation، nutritional and environmental factors are the main factors for indicing of these histopathological aspects.