Experienced breeding bosses know that every year before the white dew will be a microscopic examination of the farmed animals to see if there are excellent parasites, there are parasites that need to be killed by special insects, and if not, they will also be killed once. When the dew is white, the temperature gradually drops across the country, and the temperature difference between day and night increases. During this season, the fish load and feeding volume of the aquaculture water body entered the peak of the year, and the water quality of the pond was aging, which was easy to induce bacterial and parasitic diseases of aquatic animals. The following are several common parasitic diseases in aquaculture, after reading it, I hope to help you breed!
A parasitic disease common in culture
First, wheelworm disease
1. Pathogen
Wheel worms.
2. The main hazard object
Seed of a variety of freshwater fish.
3. Main symptoms
When a small amount of parasitism occurs, there are no obvious symptoms; once the wheelworm parasitizes in large numbers on the surface of the body and on the gills, the fry shows the symptoms of "white head and white mouth", or swam wildly around the pool in groups, showing "running horses" symptoms. Except for blackening, emaciation, and solitude on the surface of the body, the diseased fish have no obvious disease. Mainly the gill tissue rots, the gill filament cartilage is exposed, which seriously affects the breathing function of the fish, makes the fish lack of oxygen, suffocate and die.
4. Prevalence
Fish farming areas in the country occur all year round, causing a large number of deaths of sick fish, mainly on hot days.
5. Preventive measures
During the seedling breeding period, the observation is strengthened to determine the intensity of infection, that is, 1 field of vision under low magnification reaches more than 10 insect bodies, and timely treatment measures are taken. Microscopic examination of gill filaments, skin, tail and other parts can show a large number of rotid worm parasites.
6. Treatment methods
A gill wire compression sheet all wheel worms must be killed in more than 10, and below 10 are controlled by bottom speed.
On the first day, the corresponding insecticide is sprinkled throughout the pool with the insecticidal body.
The next day with "high iodine + mold net (3.0 acres per group)" the whole pool was sprinkled with disinfection.
At the same time, mix the medicinal mushroom Bike (2500-3000 kg fish body / group) for 3 to 5 days, mix Weiyu super immune treasure, regulate the physiological balance of the body, improve the physique of aquatic animals, improve immunity, and reduce the incidence.
2. Ringworm disease
Ringworms.
Grass, green, silver carp, bighead carp, carp, crucian carp, tuantou bream, goldfish, mackerel, perch and so on.
Extreme restlessness, difficulty breathing, swelling of the gill filaments, mucus, anemia. After the fish is parasitized by a large number of ringworms, the gills are obviously puffy, the gill lid is open, the gills lose blood, the spirit is sluggish, and when it is severe, it stops feeding, and the gill filament rot defects, showing the characteristics of secondary rotten gills. Mild infection of ringworms is not harmful to fish, and will not cause a large number of deaths in the short term, especially adults, but it is very easy to cause bleeding diseases in the high temperature season, and the bait coefficient will increase significantly.
Most species of ringworm reproduce at a temperature of 20 to 25 °C and are endemic in late spring, early summer and autumn. Sphingular ringworm is a low-temperature species that parasitizes silver carp at a water temperature of 9 to 15 °C.
5. Prevention methods
(1) Before the fish pond is stocked, clear the pond with quicklime.
(2) Before the stocking of fish species, use a 5mg/L refined aqueous solution medicinal bath of dimethadios powder for 15 to 30 minutes to kill or expel parasitic ringworms on fish species.
Microscopic examination of gill filaments can be seen to kill more than 2 insects.
On the first day, the corresponding insecticide was sprinkled with the whole tank of insecticide, and the octyl thiophosphorus solution (for aquatic products) was 100ml/bottle for 4 acres.
The next day with "high iodine (2.5-3.0 acres / bottle)" sprinkled with the whole pool disinfection.
3. Oblique tubeworm disease
Carp tubeworm.
No specific symptoms.
It occurs in all fish farming areas of the country, mainly in spring and autumn, when the water quality is poor and the fish body is weak, it also occurs in summer and winter under ice.
(1) Thoroughly clear the pond.
(2) Strengthen feeding management, maintain excellent water quality, and improve the resistance of fish.
(3) Before wintering, the pathogens on the fish body should be killed and then fattened; at the same time, the fasting time during the wintering period should be shortened as much as possible. When fish begin feeding, they are fed nutritious feed.
(4) Before the stocking of fish fingerlings, 8 to 10 g of copper sulfate is used per cubic meter of water, or 8 to 10 g of copper sulfate and ferrous sulfate (5:2), or 10 to 20 g of potassium permanganate, and 15 to 30 min of medicinal bath. Note that the aqueous solution of potassium permanganate must be used now, and the medicinal bath is carried out in the backlight; after the medicinal bath, the fish and the potion are poured into the pool together, and the fishing sea is not used to fish again, so as not to hurt the fish body.
The treatment is the same as that of the wheelworm
Fourth, small melon worm disease
Multi-seeded melon worms.
Seed of various freshwater fish, ornamental fish.
Small white dots form at the parasite.
It occurs in all fish farming areas in the country, and the breeding temperature is 15 to 25 °C, which is mainly prevalent in spring and autumn; when the water quality is poor, the breeding density is high, and the fish body is weak, it also occurs in winter and summer.
(1) Prevent wild fish from entering the breeding system: avoid farmed fish from receiving small melon insect infections. After the pond is filled with water, it is necessary to clean it for at least 3 days before the fry can be put in, because even if the larvae are introduced with the water source, they will die after 2 days if they do not find a host infection.
(2) Fish ponds where small melon worm disease has occurred: to remove too much silt at the bottom of the pond, the cement pool wall should be washed, disinfected with quicklime or bleach powder, and exposed to the sun for 1 week.
(3) Sampling examination before the fish descend the pond: if it is found that there are small melon worms parasitizing, a medicinal bath should be used.
(4) Ensure the nutrition of the fish: such as feeding full-price feed and sufficient multivitamins, improve the immunity of the fish body, and reduce the chance of small melon worm disease in the fish.
6. Treatment Methods There is no ideal treatment for small melon worm disease at present, and taking measures in the early stage of the disease has a certain effect. The hatching time of larvae is usually at night, that is, midnight to early morning, and is sensitive to drugs such as copper sulfate, so it is best to carry out medication at night in order to kill larvae with relatively weak resistance.
(1) Soak in salt solution. Soaking in brine with a salinity of 20 to 30 is effective for treatment and prevention, or raising the water temperature to more than 28 ° C to achieve the purpose of automatic shedding of the insect body and dying.
(2) The concentration of copper sulfate and ferrous sulfate powder solution is 0.7mg/L sprinkled in the whole tank.
At the same time of treatment, the tanks and tools for fish culture must be washed and disinfected, otherwise the sac attached to it can hatch and then infect other fish.
5. Anchorhead bream disease
Anchorhead bream.
Eels, silver carp, bighead carp, grass carp, carp, crucian carp, etc.
Parasitic in the mouth, the mouth can not be opened and closed. Parasitic on the surface of the body, many insects, visible to the naked eye. In large numbers of parasites, the diseased fish initially show restlessness, jumping and loss of appetite, and there are red wounds of varying sizes on the surface of the body, and there are usually parasitisms on the body. Then the body is emaciated and the swimming is slow. Some fish fall ill and the body behaves deformed and loses balance. When seriously infected, the sick fish is like wearing a coat, so it is called "coat disease".
Freshwater fish of all ages can be harmful, the whole country has this disease, especially in Guangdong, Guangxi and Fujian is the most serious, in the water temperature of 12 ~ 33 °C can breed, so the disease is mainly prevalent in hot days.
(1) Clear the pond with quicklime or bleached powder.
(2) Using the selectivity of the host according to the pathogen, the rotation method can be used for prevention.
On the first day, the insecticide is sprinkled on the whole pool of insecticides.
The next day, sprinkle the whole pond with high iodine (2.5-3.0 acres/bottle) for disinfection.
At the same time, mix the medicinal mushroom Bike (2500-3000 kg fish body / group) for 3 to 5 days. Mix weiyu super immune treasure, regulate the physiological balance of the body, improve the physique of aquatic animals, improve immunity, and reduce the incidence of disease.