1, be frightened or stimulate: When goldfish is frightened or stimulate, can appear scale nigrescent circumstance. This is the normal reaction of a frightened goldfish, as long as the cause of the shock is found, it is easy to solve.
2. Poor water quality: Unclean water quality, too high hardness, too low dissolved oxygen and other water quality problems can also lead to black goldfish.
3. Black spot disease: The main symptom of black spot disease is that the fish body has a large area of black. This disease is generally caused by parasitic infection, which not only makes goldfish appear black spots, but also makes goldfish increasingly thin and dim.
4, illumination time is too long: If goldfish is in a sunny place all the time, it will also be prone to black spots. This is not a disease, will not affect the health of goldfish, but will affect the ornamental.
1, rest: If this is the case, directly find the factors of shock or stimulation, after eliminating the goldfish can slowly recover, do not need deliberate treatment.
2, change water: Goldfish likes to live in soft and hard moderate water, the appropriate water temperature is 20-24 degrees, the best water quality is green water. As long as they are replaced with the right water, goldfish will recover slowly.
3. Medicated bath treatment: Black spot disease can be treated by sprinkling fish tank with low-concentration salt or baking soda solution. Or take a medicated bath with two parts per million of potassium permanganate, and you can recover after a week or so.
4. Shorten the illumination time: Although goldfish like sunshine, it is not appropriate to have too long illumination time. It is better to control the illumination time within 4 hours every day. If the illumination time is too long, it should be properly shaded.
