Fishes having Blood flagellates (Sleeping sickness) usually show this symptom of 'Sunken eyes'
Carefully read though the article to find out whether your Tench is having Blood flagellates (Sleeping sickness).
This is an infection. Fish infected with Cryptobia are listless and swims abnormally. They become emaciated with sunken eyes and pale gills. Pale gills are an indication of a lack of red blood cells. Disease can be seen in marine and fresh water fish. Aquarium fishes are rarely affected.
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