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Protozoan Infections


White spot

Whitespot is a parasite that gives the appearance of white spots all over, in severe cases the spots can join up, they also scratch against stones, plants and pond equipment, and are seen swimming erratically.

Many remedies are widely available and based on copper sulphate, malachite green and methylene blue.

Although it appears that the white spot has gone, the treatment would need to be continued to attack the free swimming stages of the parasite.



Costiasis appears as a bluish/white slimy colouration of the gills and skin, if badly infected it can produce blood spots.

They can be seen swimming awkwardly with their fins close to the body.

This disease is best treated by removing the fish from the pond and treating them else ware as the disease can only survive for about 1 hour away from the fish, this will then give you a chance to disinfect the pond using acriflavine or formalin.

Read the instructions carefully for the right dosage.



Chilodonelliasis is similar to Costiasis with the addition of a lumpy texture appearing in the neck and dorsal fin area; it can also cause breathing difficulties.

Salt, acriflavine and malachite green are used as a remedy.

Please read the instructions of how to carry out the treatment and the correct dosage.



Trichodiniasis is similar to Costiasis but less severe, the difference can only be established through microscopic investigation.

The same treatment is carried out with the diseases Costiasis and Chilodonelliasis.


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