Fishes having Nodular diseases usually show this symptom of 'Whirling motion'
Carefully read though the article to find out whether your Tench is having Nodular diseases.
Infected fishes show rice-shaped cysts on the gills and skin, varying from pinhead-sized spots to boils as large as pea and larger.
In some cases balance michanism of the fishes may disrupted.
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Tench sufferring from Nodular diseases
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Protecting other fishes
It is better to destroy heavily infested fishes and to disinfect the tank or pond thougoughly.
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