CATDOLL : CATDOLL: How many times should I kill the ringworm? What is the incubation period of the ringworm?

1. How many times should the ringworm be killed?

Kill twice

The first time to kill insects: from mid-to-late March to around Qingming Festival, when the water temperature is 18℃~20℃ and it is sunny for 3 consecutive days, you can do the first time to kill insects.

Second pest control time: when the water temperature is lower than 20℃, the second pest control should be carried out 7 days after the first one; when the water temperature is higher than 22℃, the second pest control should be carried out 3 days after the first one; if you are killing wheelworms, the second pest control should be carried out 1 day after the first one (the larvae of wheelworms can be hatched in 3 days when the water temperature is 22℃~26℃; the reproduction cycle of wheelworms is only 24 hours).

2. What is the hatching period of Dactylopidae?

The eggs laid by Dactylopius are sinking eggs that will sink to the bottom of the water. When the water temperature is 20 degrees, ciliated larvae will hatch in 4-5 days.

Once it encounters a suitable host, it will parasitize it and can reproduce again after just over 20 days.

The ringworm is hermaphroditic, with an egg nest at the tail and sperm nest below it. A mature ringworm can lay more than 10 eggs an hour when the water temperature is 20 degrees. Once it encounters external stimuli, the ringworm has an instinctive desire to continue its reproduction and will speed up its egg-laying process. Some of them are accustomed to laying more eggs in the evening.

3. What does the ringworm look like?

Dactylorhiza is a small monogenean trematode. The adult body is flat, usually oblong, less than 2 mm long, and milky white. When moving, it moves like an inchworm, and its expansion and contraction can be seen with the naked eye.

4. What is the growth environment of Dactylopidae?

The temperature between 20 and 28 degrees Celsius is the most suitable for the growth of Dactylorhiza. Dactylorhiza mainly parasitizes on the gills of fish. Eels parasitized by Dactylorhiza will have increased secretion of gill mucus, congestion of gill flaps, abnormal rise and fall of gill covers, and all or part of them will be pale. Breathing will be very difficult, and the amount of food intake will decrease. In severe cases, the eels will not eat. The eels will swim slowly and weakly, and sometimes they will swim alone and run around on the water surface. When Dactylorhiza parasitizes in large numbers, it will cause a large number of eels to die.

5. What kind of fish does the word "虫" (insect) represent?

The characters with the character "鱼" (fish) and "虫" (insect) (insect) radicals originally refer to fish and insects, such as catfish, salmon, whale, mandarin fish, grass carp, carp, silver carp, porgy, crocodile, eel, ray, perch, Spanish mackerel, while insects with the character "虫" (insect) radical include butterflies, dragonflies, snails, ants, grasshoppers, leeches, bats, mole crickets, crickets, silkworm pupae, katydids, centipedes, earthworms, cockroaches, roundworms, etc.

6. Are Dactylopidae afraid of high temperatures?

Not afraid of high temperatures.

In March and April, as air and water temperatures continued to rise, the activities of various pathogens intensified.

The first time to kill insects is from mid-to-late March to around Qingming Festival, when the water temperature is 18-20℃ and it has been sunny for 3 consecutive days.

Second time to kill insects

When the water temperature is less than 20 degrees, the second insecticide should be carried out 7 days after the first insecticide; when the water temperature is higher than 22 degrees, the second insecticide should be carried out 3 days after the first insecticide.

7. Special medicine to kill ringworms?

Mebendazole and albendazole.

Both are effective, but the national standard medicine for killing Dactylopidae in aquatic products is tobendazole solution, while albendazole is an oral medicine. The specific effect of use is that tobendazole is more effective and convenient to use, but the disadvantage is that drug resistance is increasing; albendazole is a powder, which is inconvenient to use, but the drug resistance is better. Each has its own advantages.

8. Sporozoan disease in fish?

First, we need to distinguish the type of disease and the type of fish we are raising. Sporozoa are a large class of pathogenic protozoa, and there are many types. There are many fish disease sporozoa, which can parasitize the mesentery, gills, brain, spinal cord, and internal organs. Iodine bubble worms are the main pathogenic organisms of carp. Generally, prevention and treatment are the main measures. It is too late to infect the fish. Prevention and control methods:

1. Thoroughly clean the pond with quicklime, etc. to inhibit the massive reproduction of spores and reduce the occurrence of this disease;

2. Before stocking the fish, add 500g of potassium permanganate to 1 cubic meter of water, stir to fully dissolve it, and make a solution with a concentration of 500mg/L. Soak the fish for 30 minutes, or add 500g of lime nitrogen to 1 cubic meter of water, stir to make a suspension, and soak the fish for 30 minutes. Treatment of myxosporean disease This disease is caused by myxosporeans parasitizing the skin, gills, intestines and nervous system of fish. The parts of the fish disease have cysts, which are grayish white dots and tumors. Common myxosporeans include pancake-shaped iodine spores, wild carp sulfonium spores, crucian carp iodine spores, silver carp iodine spores, etc. Symptoms: The sick fish are emaciated, the body color is black, they swim alone or restlessly and wildly, and they are extremely harmful to the fish from October to February of the following year. Treatment methods: 1. Sprinkle 1 jin of 90% crystal trichlorfon per mu of water in the whole pond, and sprinkle it again after 3 to 4 days. 2. For every 10,000 fish or 100 jin of fish, mix 75 grams of edible sulfur powder with feed and feed it for one week. 3. Add 10 grams of 90% crystal trichlorfon to each jin of feed to feed fish, which can cure intestinal parasitic myxosporeans. This method is also effective for ringworm disease. Compare the following information, and it is best to consult an expert for specific practices. Other classifications 1. Madness disease is also known as silver carp madness disease, crazy knife, and silver carp iodine bubble disease. It is caused by silver carp iodine bubble parasitism in various organs and tissues of silver carp, especially the nervous system and sensory organs, such as the brain, spinal cord, parasitic lymph fluid in the cranial cavity, nerves, olfactory system, balance, and auditory systems. Silver carp fry can be infected as soon as they emerge from the membrane. At present, in production, it mainly harms silver carp of full age. When the disease is serious, it can cause a large number of sick fish to die; the meat of sick fish is not fresh and has a strong fishy smell, and it is very thin, so the commercial value of the fish that have not died is also seriously affected. This disease occurs in rivers, lakes, reservoirs, and ponds across the country, especially in Hangzhou, Zhejiang. When seriously infected, the sick fish are extremely emaciated, with a large head and a small tail, with an upturned tail. The weight is only about half of that of a healthy fish. The length of the head is 2.95 times the height of the tail stalk (2.2-2.3 times for healthy fish), and the body color is dull and lusterless. The sick fish swim alone in the water, often jumping out of the water and diving back into the water, repeating this many times and dying. When dying, the head often burrows into the mud. Some swim sideways and die due to loss of balance and feeding ability, so it is called crazy disease. When the fish body is cut open, white cysts of varying sizes visible to the naked eye can be seen at the place where the silver carp iodine vesicles parasitize; the liver and spleen are atrophied, there is ascites in the abdominal cavity, and the vagus lobe of the cerebellum is significantly congested; the sick fish are severely anemic. 2. Pancake iodine vesicle disease is a serious fish disease during the grass carp seedling breeding period. It is caused by the parasitism of the pancake-shaped iodine bubble worm, which mainly parasitizes the intestinal wall of grass carp, especially the lamina propria and submucosa of the foregut. It occurs in all fish farming areas across the country, with Fujian, Guangdong, Guangxi, Hunan, Hubei and other places being the most serious. The mortality rate can be as high as over 90%. The fry are infected 12 days after being put into the pond, causing a large number of deaths. When the water temperature is 27-30℃, it takes 12-15 days for the worm to develop a generation in the body of grass carp. When the spores aged for 6-8 months are used to artificially infect grass carp fry, 100% of them will become ill. It mainly harms grass carp with a total length of less than 5 cm, and bighead carp, silver carp and black carp mixed in the same pond are not affected. The disease is prevalent from May to July, especially from May to June. Many small white cysts are formed at the parasitic sites of the pancake-shaped iodine bubble worm, and the cysts are surrounded by connective tissue membranes formed by the host. The body color of the sick fish is black; the fish is emaciated, with a slightly swollen abdomen, light red gills, anemia, no food in the intestines, thickened foregut, and degeneration and necrosis of the intestinal wall tissue; when a large number of pancake-shaped iodine bubble worms parasitize on the spine, the fish body may bend. According to reports from Sichuan Province, pancake-shaped iodine bubble worms parasitize in the muscles of carp fry, forming white cysts. The body surface of the sick fish is uneven, and the fish grows slowly. In severe cases, the disease causes a large number of deaths. 3. Wild carp iodine bubble worm disease Wild carp iodine bubble worms parasitize on the skin and gills of dace fry and summer carp, forming many gray-white tumor-like or dot-like cysts, especially on the body surface. In severe cases, it affects the breathing and swimming of the sick fish.

9. What is the difference between Trichodina and Dactylopidae?

Wheelworms and ringworms, these two parasites, the former belong to the ciliates of the protozoa class, and their individuals are relatively small, and their shapes can only be seen through a microscope; the latter belong to the monogenean trematodes of the worm class, and their shapes also need to be seen through a microscope, but under the same magnification, the individuals of the latter are obviously much larger than the former, and their shapes are also different.

10. What are the symptoms and manifestations of Dactylopsis?

The main symptoms are dark red gill filaments, slight swelling, increased mucus, and a little dirt. Treatment suggestions are as follows: 1. Studies have shown that half of the ringworms will die after 48 hours of continuous use of insecticides, and all will die after 96 hours. The efficacy of commonly used drugs is generally 2-3 days, so disinfect again after 2-3 days.

2. All drugs have drug resistance, so it is recommended not to use the insecticides commonly used in the first half of the year in the second half of the year. It is recommended to switch to other insecticides or manufacturers.

3. The eggs of most parasites reproduce at the bottom of the fish pond. Ringworms will lay a large number of eggs before dying, so using "chlorine dioxide" to kill the eggs and sterilize at the bottom two days after the insecticide can kill two birds with one stone.