Diseased fish samples sought

UDN is a disease mainly affecting wild salmon, sea trout and brown trout. It usually occurs in adult fish returning from the sea and starts as small lesions on the scale-less regions of the fish, mainly the snout, above the eye and on/​above the gill cover. On entry to fresh water lesions ulcerate and may become infected. For further information please click the following link: 

UDN – Ulcerative Dermal Necrosis

UDN occurs in cold water temperatures only and disappears over the summer. The last major outbreak was in the late 1960’s/early 1970’s and caused huge losses in the wild salmon population.

If any members recognize the early signs of the disease, photographs can be sent to Sandra Schlittenhardt at sandra.​schlittenhardt@​stir.​ac.​uk to assist with an ongoing Phd at Stirling University. 

Any members wishing to help sample fish can also get in touch for instruction on how to do so.