1. What fish diseases should be paid attention to in spring and autumn?
The water temperature in spring and autumn is similar, the environmental conditions are similar, the fish disease is basically the same, the fish are susceptible to water mold, enteritis, rotten gills, tapeworms, anchorhead loach whitehead white mouth disease. Attention should also be paid to the prevention of printing diseases of silver carp and bighead carp, vertical scale disease of carp, finned uterine nematode disease, Chinese whirlwind disease of grass carp and silver carp, and bleeding disease of grass carp species in late spring.
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2. What fish diseases should be prevented in summer?
Summer is the season of high incidence of fish diseases, the harm is greater, causing a large number of dead fish include hemorrhagic disease, red skin disease, rotten gill disease, enteritis disease, gill mold disease, and in recent years, crucian carp, silver carp outbreak disease. All kinds of parasites can multiply in large numbers during this season, and drug prevention should be done before the epidemic of fish diseases.
3. What fish diseases should be prevented in winter?
Winter fish generally rarely develop diseases, but they should not be neglected, often due to dragnet transport, or parasites caused by injuries to the fish and water mold disease. Dead fish can also be caused by excessive wintering density and deterioration of water quality, resulting in hypoxia or bubble disease.
4. What diseases often occur in seedling breeding?
Summer flower fish fingerlings are susceptible to parasitic diseases, such as small melon worm disease, wheel worm disease, ringworm disease and sporangiasis, running horse disease, bubble disease, etc.
The fish fingerling stage is mainly large-sized grass carp fingerlings prone to toxic hemorrhagic diseases, bacterial enteritis and gill rot. Parasitic diseases in the summer flowering stage are also more harmful.
5. What common diseases should be paid attention to during the rearing period of adult fish?
The more harmful microbial diseases are mainly enteritis, gills, bleeding, scales, printing, water mold; parasitic diseases include tapeworms, nematodes, ringworms, three-generation insects, wheelworms, coccidioides, and myxosporids.
6. How to carry out drug prevention in the epidemic season of fish disease?
(1) Prevention of fish diseases in vitro
Entering the peak period of the disease, it is generally sprinkled with insecticides every 20 days, and then 1 to 2 times of sterilization and disinfectant, which can effectively prevent various ectoparasitic diseases and diseases such as rotten gills, red skin, printing, bleeding, etc., and regularly inject new water to regulate water quality.
(2) Prevention of fish diseases in the body
The prevention of fish diseases in vivo is generally taken orally. Since the fish could not be forced to take the medicine, the medicine could only be mixed in the feed to make medicinal bait and fed. At present, it is commonly used to make bait made of sulfonidine powder, mainly to prevent bacterial enteritis.
7. How to feed the drug to achieve the expected effect?
(1) Feeding medicine should be combined with pool water disinfection and insecticide to achieve good results.
(2) When doing prevention, you can put some ordinary bait before the drug, so that the healthy fish eat for about 20 minutes, and then the drug can be put in, which can reduce the cost of the drug.
(3) When doing treatment, all the drugs must be fed, and the feeding should not be stopped in the middle according to the course of treatment, otherwise the fish disease will be repeated and even resistant, and it will be difficult to treat.
(4) Self-mixing medicinal bait, starch or egg can be used as a binder, the effect is good.
(5) The drugs in the drug should use different kinds, and alternately and mixed use to prevent drug resistance.
8. Why should newly opened fish ponds pay attention to heavy metal poisoning?
In places with high content of heavy metal salts, newly opened fish pond fish species often suffer from curved body disease, which directly affects the production of adult fish, causing great losses, generally this kind of fish pond is best to raise fish in the first year, because adult fish have a strong tolerance to heavy metal salts, it is not easy to be poisoned, and it is not easy to raise seedlings after the second year of clear pond water change, it is not easy to suffer from curved body disease.
9. Why do fish sometimes die when adding well water?
Well water has three disadvantages: one is that the water temperature is low, the second is less dissolved oxygen, and the third is that it contains other harmful chemical components, such as:
fe3+, no-, pb2-, etc., especially in the summer and autumn, the well water temperature is generally more than 10 °C lower than the pond water temperature, and the proportion of this water is also greater than that of the high temperature pool water, so the pond is injected into the well water in a short period of time, settling to the bottom of the pond, so that the water at the bottom of the pond and the dissolved oxygen suddenly drop, resulting in the life activities of benthic fish being disturbed, causing dead fish. Adding well water to seedling ponds may cause seedlings to die from bubble disease, because the water content is high in some areas, so it is necessary to carry out oxygenation (that is, aeration) and heating treatment before adding well water. You can set up a "water connection board" in the fish pond, or you can let the well water fall into the pool after scattering to the air, so as to improve the dissolved oxygen of the well water and discharge excess nitrogen. Lift rolling bearings can be carried out by taking the measure of taking the well water through a longer process. 10. How to prevent hydrogen sulfide and other toxic gases from harming fish?
Hydrogen sulfide and other harmful gases to fish are mainly due to the thick silt at the bottom of the pool, too much organic matter, vigorous microbial decomposition, so that the bottom layer is in a hypoxic state, accelerate the reduction reaction of organic matter, release hydrogen sulfide, biogas and other harmful gases, when these gases accumulate a certain amount of water will cause fish poisoning.
Precautions:
(1) Remove too much silt.
(2) Frequently fill with new water to keep the water fresh.
(3) Aerate the pool water by opening an aerator.
(4) Reasonable bait to reduce residual bait.
11. How to judge whether the water quality is toxic?
Invasive pathogens cause diseases to fish, once the disease occurs, it is often one or two kinds of fish disease; and the water quality is toxic to cause dead fish, often all kinds of fish in the pool are dead, and most of them are acute deaths, most of the fish in the whole pond die within one or two days, and the poisoned dead fish generally have bleeding symptoms or significant increase in mucus secretion on the surface of the body. The easiest way to prove the dead fish in acute poisoning is to use a wooden barrel to hold the pond water of the diseased fish or put the cage in the sick fish pond, put a number of healthy fish, observe for several days, and whether there are dead fish.
12. What is the redness of grass carp muscles, fins and gill caps?
This is grass carp hemorrhagic disease, which is a viral disease. The main symptoms are red muscle type, redfin red gill cover type, and intestinal bleeding type, and sometimes one of the three symptoms is prominent, and there are also three mixed symptoms. Grass carp hemorrhagic disease, mainly harmful to grass carp species, mortality rate is very high, the water temperature above 27 ° C is the most prevalent, when the water temperature drops below 25 ° C, the disease can weaken and gradually disappear.
Prevention and control methods: prevention is the mainstay.
(1) Feed high-quality bait to keep the fish body strong and improve disease resistance.
(2) Too much pond mud must be removed, enter the epidemic period, disinfect regularly, and keep the water fresh.
(3) Before the fish species are planted in the pond, do a good job of disinfecting the whole pond, kill various pathogens, find dead fish fish out of the deep burial in time, the tools are strictly forbidden to cross-use, and eliminate mutual infection.
(5) Inbreeding is strictly prohibited, and healthy fry are cultivated.
13. How to treat the three diseases of aquaculture fish enteritis, gills and red skin?
Breeding ichthyolitis, gills and red skin are complicated by three diseases, often by deteriorating water quality, large numbers of parasites on the surface of the body, secondary bacterial infections caused by invasion, and treatment should take the combination of internal and external methods.
Spillage:
Insecticides: 90% crystalline insects 0.7 kg / mu · rice, iron sulfite 0.3 kg / mu · rice triad or other commercially available insecticides, the whole pool sprinkled once every 1 day, 2 times can be.
Fungicide: Furazolidone 52/mu rice or other fungicides sprinkled once a day in the whole tank, 2 times in a row. Note: Bleach powder should be used with caution in the high temperature season, and the dosage is not accurate, which can cause a large number of dead fish.
14, fry, fish fingerling tail handle whitish serious when the tail fin rots, or incomplete, the sick fish head down, the tail up, sometimes struggling to swim, soon the sick fish that is dead What is the disease?
It is white skin disease, also known as white tail disease, caused by the white skin polar hairy bacteria, the main harm to silver carp, bighead carp, grass carp and blue fish can also occur, the course of the disease is short, from the onset of the disease to death as long as 2-3 days. The disease is generally endemic from June to August, and fish body injuries are easy to cause.
Prevention and control methods:
(1) Fishing, transportation and stocking should avoid injury to the fish body, and the parasites should be killed in time.
(2) In summer, the pond should be divided in time.
(3) Found this disease, first use herbal deworming to clean the body and kill parasites, and then use hemostatic intestinal gill to inhibit harmful bacteria, promote wound coagulation and hemostasis, promote wound healing, and each bag can be mixed with 80 pounds
15. What is the disease of crucian carp and silver carp with hyperemia on the body surface, redness and swelling of the anus, sometimes vertical scales, ascites, and high mortality?
This is a hemorrhagic disease of crucian carp and silver carp, that is, an outbreak epidemic, which is a bacterial disease. Sick fish swim wildly, irritable, the surface of the head is a little or blocky hyperemia, the gills are whitish, ascites, the intestine has little or no food, and the intestinal wall is thin and transparent. This disease mainly endangers crucian carp and silver carp, often occurs in the pond, while the main carp and silver carp ponds are rare, and this disease can cause a large number of fish to die in three or four days. May to September is the epidemic season. Prevention and control methods:
(1) Pond disinfection: after the dry pond in winter, remove part of the silt, quicklime disinfection, and release water into the fish after 7 days.
(2) In April-September, sprinkle crystalline insects (90%) 0.8 kg/mu or other insecticides 1-2 times a month, followed by 25-30 kg/mu m with quicklime, and sprinkle the whole pool 1-2 times.
(3) Drug treatment: 1 meter per mu of water surface water depth with 1 kg of copper sulfate, 0.5 kg of ferrous sulfate fully dissolved after the whole pool of wine 1-2 times, or with rhubarb 4 kg / mu · rice, the whole pool can be sprinkled once.