Large dark/black tumours
Fins show large dark tumours which are often black in colour.
Growth on body (Body)
Dark body colouration
The colours of the fish are darkened beyond their normal shade.
Dark skin pigmentation (Skin)


Black tumours grow on body of fish, caused by viruses. Possibly induced by long exposure to UV light, as has been reported from areas that were especially affected by the hole in the Ozone layer.


Outlook in obvious cases very poor. If only single fish are affected they should be removed.


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DNA and RNA diagnostic references

Evidence of Melanoma in Wild Fish Populations.

From PLoS ONE 7(8): e41989.

Michael Sweet et al. 


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