White spot disease is a ciliated disease caused by many small melon worms invading the skin, gills, fins and other tissues of freshwater fish, which mainly harms young and ornamental fish of high-density cultured fish. Symptoms are proliferation of parasitic tissues, pustules, and many small white spots on the skin and fins. After the mature melon worms leave the fish, the body secretes transparent and elastic cysts, sinks to the bottom of the water or attaches to aquatic plants and plant debris, and then begins to divide. After 9 ~ 10 division, 300 ~ 1000 larvae were formed. When the larvae are at 15 to 20 degrees Celsius, after about 24 hours, they leave the cyst, swim in the water and invade the host. Therefore, melons reproduce and spread their offspring in the form of cysts.
Treatment method: raise the water temperature to about 32 degrees to promote the development of the gourd to be separated from the fish, and keep one-fifth or one-third of the water exchange every day to kill the gourd, its larvae and eggs in about one week. A large amount of salt can be added appropriately. Remember to continue the treatment for more than a week, and stop taking the medicine every time you get better. Eggs and larvae in water will naturally recur before they are completely killed.