About this condition
A serious bacterial disease causing boils, ulcers and internal bleeding.
What is Furunculosis?
Mainly affects salmonids but can occur in other species.
A serious bacterial disease causing boils, ulcers and internal bleeding.
Category
Bacterial
Helps you quickly understand whether this is a parasite, viral issue, water quality problem or wider management topic.
Severity
🟠 High risk
Use alongside EA guidance and your own fishery rules to decide next steps.
Notifiable?
Yes – EA must be informed
Always follow the latest EA advice on notifiable fish diseases.
Linked species
No specific species linked
Used to surface this guidance directly inside the Clubnest Species Guide.
Notifiable fish disease
If you suspect this condition in wild or stocked fish, contact the Environment Agency incident hotline immediately. Do not move fish, stock new fish, or carry out works that could spread disease.
A serious bacterial disease causing boils, ulcers and internal bleeding.
Mainly affects salmonids but can occur in other species.
If you suspect this condition, see unusual fish behaviour, or witness a pollution incident at your waters, you must contact the Environment Agency immediately. Quick reporting protects your fishery and prevents further fish mortalities.
EA Incident Hotline
0800 80 70 60
24 hours · Free to call
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