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Fungal swimbladder infection in farmed Baltic salmon (Salmo salar L.) caused by Verticillium lecanii



Fungal swimbladder infection in farmed Baltic salmon (Salmo salar L.) caused by Verticillium lecanii



Mycoses 31(4): 208-212



A fungal swimbladder infection caused by Verticillium lecanii was diagnosed in one-year-old Baltic salmon. The fungus was easily isolated on nutritionally poor basal medium and Sabouraud glucose (2%) medium at room temperature. The colonies were white to cream-coloured and cottony. The phialides were solitary and rose erect from the conidiophores. Verticillium conidiophores were also seen. Conidia of size 2.5-5.0 .times. 1.0-2.5 .mu.m and mainly ellipsoidal were found in slimy groups on top of the phialides. Haemorrhagic swimbladder inflammation with sloughing of the epithelium was seen histologically. Hyphae were evident in the tissue and secondary bacterial infection was also found. The infection occurred in a period of extremely low water temperature (<1.degree.C) when primary bacterial infections are seldom seen.

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Accession: 007365643

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PMID: 3405250


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