Investigation of the prevalence of fungal infections in the skin and gills of freshwater ornamental fish in Tehran city

Background of the study:

 In the cultured and ornamental fish industry, fungal organisms threaten young and adult cultured populations and lead to the decay of eggs and larvae. Fungal Infections Secondary infections in fish are caused by primary parasitic, viral and bacterial organisms.

In this research, the number of fungal infections and their type of infection in ornamental fish should be determined.

This study was conducted on ornamental fish with clinical symptoms. The samples were obtained from different places. After identifying the fungi, their abundance was checked by culture and PCR.

Out of the total of investigated cases, the skin and gills had lesions in cases, and the result of mushroom culture was positive. In the PCR analysis of these samples, the fungal species identified by gene sequence were Cladosporium, Candida, Penicillium, and Aureobasidium pullulans and Rhodotorula yeast. Pathological lesions in the gills were dark and hyperemic; under the microscope, epithelial cells were shed, and leukocytes were present. It was seen in the skin as macroscopic and microscopic wounds. Finally, these fungi are responsible for forming lesions seen under certain conditions, such as environmental instability and immunosuppressive factors.