There are black spots on fish scales, most of which are fried scales. Scale frying is a common fish disease, which is extremely harmful to fish, and it is easy to die if it is not treated in time. The appearance of black spots on fish scales is the initial manifestation of scale frying. At this time, it needs to be isolated first, and then treated with hydrochlorothiazide and cefixime, once a day for half a day each time. If you don't recover after three days, you need to take a bath with furosemide and amoxicillin, change one third of the water every day, and take tonic at the same time.

1. Stop feeding: After fish fried scales are found, stop feeding first, because fish at this time often have no appetite, don't eat after feeding, and pollute water. Therefore, the fish should be treated first, and then it can resume normal feeding after it recovers. Don't worry about the fish starving to death. Under normal circumstances, it is fine to starve for days or even weeks.

2, the old three: After scales are fried, the old three methods should be used first. The so-called old three things are changing water to heat up and adding salt. Water is usually changed every other day, so as to improve the water quality as soon as possible. The temperature rise should not exceed 2 ℃ a day to avoid large temperature fluctuation. The concentration of lower salt is usually about three thousandths.

3. Medicated bath: If the scale explosion is serious, it is necessary to take medicine immediately. Prepare a proper amount of yellow powder and two gentamicin, inject them into the fish tank, soak them for a period of time, and then change the water. In addition, you can use salt water with baking soda, or use penicillin to soak and wash.