Trichodina

Trichodina is a single-celled flagellate that frequently parasitizes pond fish such as koi and goldfish. The parasite is a protozoa that are divided into three categories: Celiates, Flagellates and Sporoza. It is a saucer-shaped parasite with cilia for movement. This parasite is visible only with a (good) microscope. It has an average size of 50 µm (=0.05 mm). About as thick as a human hair. Reproduction is by cell division. Under optimal conditions, this can be very fast. They multiply between 4°C and 30°C. We therefore encounter this parasite throughout the year. Trichodina can be found on the body and on the gills of the fish, making it difficult for them to breathe. Extra aeration is therefore recommended.

Treating Trichodina

Single-celled parasites are good to control, provided treatment begins early. Otherwise, control takes a lot longer and more time. Treating with a good agent is sufficient. To prevent infection with Trichodina, it is important to feed the fish during the summer months with a good quality food in which all the important nutrients, vitamins and minerals are present in ample quantities. The fish will then have sufficient resistance during the winter months and spring to fight off the trichodina parasite. Another cause may be poor water quality, or possibly too many fish in the pond. Rule of thumb for the number of fish in a pond is a maximum of 50 cm of fish length per 1,000 liters of water. A good filter, equipped with activated carbon offers a solution because this carbon can purify all kinds of micro-fine dust particles from the water. It also filters out various pathogens.