Identification and determination of prevalence of saprophytic fungi in the larval stage of the rainbow trout (Oncorhynchus mykiss) in hatcheries of west Azarbaijan province

Subject Areas : Veterinary Clinical Pathology

Elnaz Ghorbani ¹ (Graduate of Microbiology, Depatment of Pathobiology, Faculty of Veterinary Medicine, Urmia Branch, Islamic Azad University, Urmia, Iran.)
Dariush Azadikhah ² (Assisstant Professor, Department of Pathobiology, Faculty of Veterinary Medicine, Urmia Branch, Islamic Azad University, Urmia, Iran.)

Received: 2016-12-19 Accepted : 2018-05-06 Published : 2019-04-21

Keywords: Fungi, West Azerbaijan, Rainbow trout larva,

Abstract :

Identification and epidemiological survey of fungal infections at the hatcheries has great importance for prevention of mortalities and subsequent economic losses. In this survey, 5 rainbow trout hatcheries in west Azarbaijan province were investigated. Sample collection was conducted according to standards of Iranianveterinary organization. Water quality of the hatcheries was investigated as well. SDA (sabouraud dextrose agar) medium was used for fungal culture and identification of fungal type was based on microscopic examination of fungal reproductive organs. Four different genera of saprophytic fungi consisting of Saprolegnia sp., Penicillium sp., Aspergillus sp. and Achyla sp. were isolated from the 5 studied hatcheries. The genus Saprolegnia with 7.8±1.48% infection rate and Achyla with 0.8±0.83% infection rate had the highest and lowest prevalence respectively. Based on the results of this study, the sanitary conditions in hatcheries of west Azarbaijan province are not ideal with respect to fungal infections. Water quality of the hatcheries was acceptable therefore fungal infections are probably not associated with the water quality.

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