Fishes having Nodular diseases usually show this symptom of 'Small white spots'
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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