First, the factors that lead to hemorrhagic disease in koi fish are complicated, generally caused by viruses, bacteria and environmental factors:
1. Viruses, bacteria (generally thought to be caused by unicellular bacteria) and parasites invade the fish, causing the whole or part of the fish to be damaged.
2. Relationship between water quality Whether you use tap water or lake water or well water to raise fish, you should let it stand or expose it to the sun for 2-3 days before using it. If used directly without treatment, the fin scales will be congested and koi fish will die.
Second, [Symptoms] Fins (more serious at the base), scales or local congestion, bleeding, ulcers, scales falling off; In severe cases, the mouth, eyes and internal organs bleed, and the sick fish are lazy to swim. The light person's appetite decreased, the heavy person refused to eat, his body color was dim, his weight was reduced, his secretion increased, and he died of bacterial water mold and septicemia.
Third, the [onset season] can occur all year round, especially in June-10.
Four. [Control Method]
(1) Besides paying attention to the prevention of the above pathogenic factors, it is also necessary to check whether there are parasites at the bleeding place, and if there are, catch them. At the same time, wipe the affected area with mercuric chloride, then rinse it with a small basin and put it back in the original pool (cylinder) to rest, once a day/kloc-0 times, until it is cured.
(2) Put the sick fish in 10-20mg/L of furacilin or furazolidone solution or 2%-3% of salt water for 1 0-0/5min, and then wash it in the tank (cylinder) every other day1time.
(3) In severe cases, 654.38+00,000 units of kanamycin or 81654.38+06,000 units of gentamicin were added to 654.38+00 kg of water, and the sick fish were bathed for 2-3 hours, and most of them were fed with fresh water after half a day. 65438+ 0 times a day, usually 2-3 times.