The small white spots on the Black Mary fish are due to its white spot disease. The cause was an infestation of the Ichthyophthirius. Ichthyophthirius is a relatively large ciliate. They can survive in the water for a short time, looking for a host. Their larvae will invade the skin and gills of the black Mary fish, parasitic growth, and slowly grow into adults. This disease often occurs when the water temperature is too low and the light is too weak.
After the black Mary fish is found to have white spots, it is necessary to isolate the sick fish in time, change the original water, and use 2g/m ³ mercurous nitrate solution for medicinal bath treatment. The time of medicinal bath should be controlled at about 2-3 hours. If the sick fish is still young or weak, the concentration of the medicine can be lowered appropriately, or the time of the medicine bath can be reduced to avoid hurting the fish. After medicated bath, it should be placed in high temperature water at about 30 C. A small amount of salt can be put into the water to disinfect it. After a period of slow maintenance, they can recover their health.
In the usual maintenance, to control the water temperature, keep the water temperature between 22-28 ℃, and do not let it appear in a short period of time a larger change. Ichthyophthirius is sensitive to water temperature and difficult to survive in high temperature water. Therefore, good control of water temperature can effectively prevent white spot disease. In addition, a small amount of salt can also be added to the water to disinfect it.
