Common fish diseases control

Common fish diseases control

Fish life in the water of life, and environmental factors is complex, often hit by viruses, bacteria and parasites, so fish is sick for many reasons, often cause large numbers of deaths after the fish is sick, even if the fish is sick is not death but also seriously affected the growth of fish. Like other animals do not treat fish diseases and treatment, have difficulties in water treatment and isolation. In aquaculture, therefore prevention is an important measure to prevent fish disease, prevention is more important than cure.
First, the prevention of fish disease
Prevention of fish disease from three aspects, one is to destroy pathogens and predators, second is to improve the living conditions of fish, making the environment conducive to the growth and health of the fish, the third is enhanced resistance of the fish.
(A) the clear pond
Put pond water dry or drain, clearing the pond bottom and Tong Geng, trash, weeds, fix Geng feet to prevent water seepage, leakage, keep the pond bottom mud 10cm, Tang 5-7 at the end of the day, sunlight exposure, fish pond, pathogens and predators for biological removal of more complete.
(B) the fish pond sterilization
1. Health lime disinfection: ponds clearing Hou, in dry pool conditions Xia with health lime 50-75 kg/acres, full pool spilled, health lime with wood barrels or plastic barrels, container Sheng water dissolved Hou, hot spilled, as bottom also left 5-10cm of water, is can without container, in pool end of uniform of dug many shallow pit, will health lime directly put to each small pit,, sucking hydration open Hou, will lime water spilled full pool, again with rake will pit within of lime rake moving mix. 1-2 days can be basal, 2-3 days after fresh water, 5-6 days can fish.
Another is water disinfection methods, such as fish ponds and drainage problems or anxious when species, this method can be used, depth of 1 m per acre quicklime 130-150 kg, evenly sprinkle it in the whole pond, 7-8 days after the fish.
2. Bleach disinfection. After draining the pond water with bleaching powder 4-5 kg/acre, water sprinkle it in the whole pond, amount of bleach with water to a depth of 1 m per acre 13-15 kg, 5-6 days after fish, note that bleach does not use a metal container holding water dissolves. Amount of chlorine bleach in about 30%, that pungent smell bleach large, insoluble in water heating.
3. Tea disinfection. Average water depth of 1 m per acre when dosage is 40-50 kilograms, tea cake is first crushed into small particles, is immersed in the solution for a day and a night, even slag with juice evenly sprinkle the whole pool, tea cake can kill wild fish eggs, tadpoles, snails, frogs and aquatic insects, but not do much help to kill bacteria and parasites.
Three Qing Tang disinfectants, lime and chlorine bleach has a number of advantages, kill bacteria more thoroughly, and lime as well as improving water quality.
(C) species disinfection
Species will inevitably bring some pathogens, after disinfection of pond clear, with no stocking of fingerlings disinfection will bring pathogens to the water, once the conditions are right, multiply and cause disease. Disinfection drug dipping method is often used for species.
1. Bleaching powder and copper sulphate mixture for dipping. 1 cubic meter water with bleaching powder 10 g and 8 g copper sulfate. Note: bleaching powder and copper sulphate after dissolving contact separately by different blending mixture, dipping fish in the 10-20 c 20-30 minutes.
2. Potassium permanganate solution dipping. 1 cubic meter of water used 20 grams of potassium permanganate, when dipping the fish 10-20 1-2 hour, liquid preparation used, over a long period of failure.
3. Dipping salt solution. With sputter the salt solution, 10-20 dipped Fingerling 4-5 minutes.
Any solution when dipping fish, dipping the length of time appropriate to the species healthy and low temperatures to make appropriate adjustments.
(D) water disinfected on a regular basis
Most fish disease of occurred, are has must of seasonal, many fish disease in 4-October popular, especially 6-September, water temperature increased, fish growth speed speed up, disease original body and predators biological large breeding, fish disease also easy occurred, so strengthening farming water of feeding management, insisted regularly water drug disinfection, improved water environment, is prevention fish disease occurred of important measures.
1. In April, and in late May to mid June, monthly 90% crystals of dipterex on aquaculture water disinfection to kill parasites, dosage is 0.5 grams per cubic meter, surface 1 m depth for 6-7 two per acre. 1-2 acres of fish ponds of small bodies of water, and sprinkle it in the whole pond methods available, large surface cannot be splashed all over the whole pool of cases, methods that can be used near food bags hanging bag, hanging 3-6, 100-150 grams per bag charge for 2-3.
2. June early with bleach or health lime on water disinfection sterilization, bleach dosage for 1 cubic metres 1 grams, dissolved Yu water full pool spilled, larger water can used hanging basket method, each only baskets within loaded drug 100-150 grams, hanging 3-6 only basket, hanging in food field near, or with health lime on water sterilization disinfection each acres water depth 1 meters dosage for 15-25 kg, dissolved water full pool spilled, larger water with health lime can in food field around slightly poured reuse volume, water other place to as spilled to.
From late June to early July with copper sulphate and ferrous sulphate mixture to sprinkle it in the whole pond, Protozoan parasite-killing, prevent the occurrence of protozoal disease, the dosage of 1 cubic meter 0.7 grams, which is 5:2, or bagging method, each containing 100 g, 40 g of ferrous sulfate copper sulfate, General hung 3-6 bags.
3. From July to September with the increase of water temperature bacteria multiply, are prone to diseases and, therefore, every 20-30 days applying bleaching powder or lime pool splashing or bags hanging basket method of killing pathogens, the prevention of fish disease.
Second, the diagnosis and treatment of several common fish diseases
1. Red grass carp disease
Red skin disease is by fluorescent very hair Bacillus invaded for netting and the handling in the skin injured of fish body and caused, main symptoms is: fish body local or big Department congestive, and inflammation, and scales off, especially fish body sides and the abdominal most obviously, part or all fin article of base Department congestive, fin article shoots end rot, fish of Shang jaw and the Gill cover part congestive, rendering block erythema.
The disease can occur from early spring to winter, but are more common in late spring to early autumn, the main harm grass carp.
Treatment methods:
(1) the bleach: water treatment 1 gram per cubic metre, water sprinkle it in the whole pond.
(2) five times: 2-4 grams per cubic metre of water treatment, five times a mash with boiled water for 1-2 hours, whether residue or juice to sprinkle it in the whole pond.
(3) the bacteria with the exception of the disease outside the skin, muscles, causing lesions in fish, will invade the blood of fish, except for drugs, must also be used for internal use, in accordance with the description of the medicine used.
2. Gill-rot disease
Fish Gill-rot disease is caused by damage caused by Neisseria mucosa into the gills of a fish, the main symptoms are: sick fish often stray du tour, slow, loss of appetite, or not eating, body color black, especially on the head is black, so it is also called “Wu-blast.” Fish Gill rot disease white, often accompanied by sludge and slime, and severe congestion on the inner surface of the operculum, the middle portion of the skin is often eroded into a small transparent window, also called the “open window”.
This disease is often found in the grass, herring, Bighead carp, carp and other fish, mainly carp, 4-10 months the water temperature 20 deg in fashion in General, often with red skin, enteritis diseases in grass carp at the same time.
Treatment methods:
(1) lime sprinkle it in the whole pond, depth of 1 m per acre, is 15-20 kg.
(2) bleaching powder sprinkle it in the whole pond, water 1 gram per cubic metre.
(3) five times child sprinkle it in the whole pond, 2-4 grams per cubic metre of water treatment, warm water immersion, whether residue or juice spilled.
(4) birds with erythromycin and sprinkle it in the whole pond, 0.3 grams per cubic metre of water medication the next day, mix feed will this medicine taken orally, by 100 kilograms of fish on the first day for 4 g, the second through sixth days halved.
(5) water depth of 1 m per acre with 2 kg rhubarb, 0.3% ammonia-soaked for 10 hours, sprinkle it in the whole pond, rhubarb-ammonia ratio is 1:20.
3. Enteritis diseases
This disease is caused by intestinal gas production a single Spore, and the main symptoms: fish, loss of appetite, slow, from the single swim, abdominal swelling, Erythema, swelling, the anus, and tap in the abdomen, anus and a light yellow mucous outflow, intestinal inflammation, hyperemia. Often associated with the Gill-rot disease of grass carp at the same time.
Season May-September, major hazard 1-2 carp, water temperature is 20 degrees or more.
Treatment methods:
Treated with oral and topical medication in conjunction. For external use 1 gram per cubic meter water used bleach spilled over the whole pool or the quicklime sprinkled over the pool, water depth of 1 m is 15-20 kg per MU.
Medicine medicine can be purchased according to the directions, the other herbs that are available are as follows:
(1) garlic: per 100 kg of fish with garlic 0.5 gram (mash and blend in the flour or rice flour) and 200 grams of salt per 5 kg of feed, mix well for 3 days with fresh grass, once a day.
(2) to acalypha: hay per 100 kg of fish of 0.5 g or 2 kg fresh grass mixed inside the bran, flour, feed, for 3 consecutive days, one day at a time.
(3) hydropiper and acalypha: hydropiper per 100 kg of fish and acalypha 1 kg mixed with water 5 kg, boiling 1-2 hour, after cooling, mix feed, continuous feed 3 days, one day at a time.
These three kinds of bacterial fish diseases, often complicated and prone to infection and, therefore, prevention and treatment of fish disease and fish disease prevention should be emphasized.
4. Viral haemorrhagic disease
Hemorrhagic disease is mainly caused by herpes virus, characterized by three types of symptoms:
1. “Red muscle” type: this type is more common in the smaller grass species, fish had no significant bleeding or only minor bleeding, but grilled in addition to skin, muscles visible point or massive congestion, when muscles are bright red, Gill was port-congestion or gills appear “white gills.”
2. “Red fin red operculum” type: fish’s operculum, fin base, head, eyes, mouth and other significant congestion, sometimes scales also have congestion, but muscle congestion is not obvious. Mainly in the large grass carp has come.
3. “Colitis”: the fish skin and muscle pump is not obvious, but cut intestinal visible in whole or in part with a bright-red, mesenteric sometimes dotted congestion, and enteritis of distinction, not a mesentery, intestinal inflammation, ulcers.
Treatment methods:
(1) per acre of water depth of 1 m by 0.5 kg rhubarb, grind into fine powder, fried boiled or soaked in water overnight, mixed feed and bait, and continued for 5 days, then 0.7 grams of water per cubic metre sprinkle it in the whole pond with copper sulphate.
(2) water depth of 1 m per acre, with rhubarb, Cork 0.5 kg 0.5 kg, scutellaria 0.5 kg, Berberine, salt 0.1 kg 2.5 kg, 10 kg of lime, mixed pulp and sprinkle it in the whole pond.
(3) drugs that can be purchased to make a good, used according to the instructions.

1. “Red muscle” type: this type is more common in the smaller grass species, fish had no significant bleeding or only minor bleeding, but grilled in addition to skin, muscles visible point or massive congestion, when muscles are bright red, Gill was port-congestion or gills appear “white gills.”
2. “Red fin red operculum” type: fish’s operculum, fin base, head, eyes, mouth and other significant congestion, sometimes scales also have congestion, but muscle congestion is not obvious. Mainly in the large grass carp has come.
3. “Colitis”: the fish skin and muscle pump is not obvious, but cut intestinal visible in whole or in part with a bright-red, mesenteric sometimes dotted congestion, and enteritis of distinction, not a mesentery, intestinal inflammation, ulcers.
Treatment methods:
(1) per acre of water depth of 1 m by 0.5 kg rhubarb, grind into fine powder, fried boiled or soaked in water overnight, mixed feed and bait, and continued for 5 days, then 0.7 grams of water per cubic metre sprinkle it in the whole pond with copper sulphate.
(2) water depth of 1 m per acre, with rhubarb, Cork 0.5 kg 0.5 kg, scutellaria 0.5 kg, Berberine, salt 0.1 kg 2.5 kg, 10 kg of lime, mixed pulp and sprinkle it in the whole pond.
(3) drugs that can be purchased to make a good, used according to the instructions.

10 tips for summer prevention of fish disease

10 tips for summer prevention of fish disease

With the advent of the summer hot season, the high season is the fish in aquaculture during the use of drugs is very frequent. But there are many users do not understand the characteristics of aquaculture fish disease control process of drugs, improper use of fishery drugs, the result not only cause economic waste, but do not receive good results. This paper introduces the ten tricks fish medication to help farmers safe, effective medication to achieve healthy farming.

    1. To remedy. Blind administration is taboo fish diseases prevention and control, so that both reach the purpose of prevention and treatment of disease, but also cause economic waste, even from the side effects. Fishery drugs chosen scientific premise is accurate diagnosis of fish diseases, a comprehensive understanding of the nature and mechanism of drug prevention, so that remedy. One must not use illegal drugs, such as chloramphenicol, norfloxacin, furazolidone, sodium pentachlorophenol, malachite green and so on. The second is to choose the appropriate medication for the condition. The third is to prevent allergies to drugs different farmed species.

    2. Drug administration time is generally in the evening before, after throwing medicine, air temperature, water temperature is lower, can reduce fish stress and physical exertion. As the morning throwing drugs, due to dissolved oxygen in the lowest state, could easily lead to hypoxia floating head. Administration of sunlight at noon, will reduce the efficacy. The rain and thunderstorms should not be splashed drug at low pressure weather.

    3. spilled liquid, must not designated dumping applications wooden ladle, spoon evenly sprinkle the like. Quanchiposa should gradually downward from upwind downwind, so that drugs even spill. In particular pond corners is easy neglected, resulting in less than the area of ​​medication, sterilization, insecticide is not complete, so fish disease recurrence.

    4. To accurately measure the drug spilled water; mixed feed drugs to more accurately estimate the weight of fish, so as not to cause poisoning or drug overdose insufficient reach therapeutic effect. Allowed to calculate the volume of water is not enough and said the drug, a phenomenon often appear Quanchiposa because of insufficient dosage, the water reach a certain concentration, poor control effect. In contrast, excessive dosage, fish endure beyond the limit, then it will cause a lot of deaths.

    5. Before the drug according to claim spill fully dissolved with boiling water, warm or cold, the drugs can not spill particulate or lump, lumps, to prevent drugs are not fully dissolved, the water is still less than the required concentration, or drug particles are fish eating and death. As of lime slurry to spill, spill bleach should not be dry. Dissolving drug should pay attention to water temperature, such as insecticidal herbs require a temperature at 60 ℃ ~ 100 ℃.

    6. Do not spill drugs fed feed, preferably after the first feeding sprinkle drugs. However, when feeding bait, to make fish fasting, let the fish snatch, in order to reduce the residence time of bait in the water, in order to avoid the drug lost in the water, resulting in waste and efficacy of drugs can not reach.

    7. The two drugs used in combination, should pay attention to drug interactions, but also to melt mixing respectively. Two or more drugs in combination, or just use a drug, the effect has not disappeared, and then they use a second drug, may increase or decrease the efficacy occur, it may appear to enhance or reduce the side effects, it is necessary to pay attention to drug interaction effect. Usually farmers should not secretly mixed fishery drugs should be used under the guidance of technical staff. Such as lime can not be mixed with bleaching powder, copper sulfate, trichlorfon. Acidic drugs and basic drugs can not be mixed. Mix the drug should be preceded by tests conducted small water bodies, and then to use a large area, must not blind mix.

    8. When the fish floating head floating head or immediately after, not medication, otherwise it will create a large number of fish deaths.

    9. Notice of drug validity. The use of expired drugs, both reach the control effect of the disease, and some will produce harmful side effects. Prevention and treatment of fish diseases with drugs, especially bleach easy to damp failure, so use dried bleach powder, lime use block ash. Usually the drug according to the provisions safekeeping and use within the warranty period.

    10. The administration should be prepared before the preparation of some emergency measures, medication should be a period of observation in the field (2 hours to 4 hours), do not leave the pond, observe the fish situation, pay attention to whether there are unusual circumstances, if it is found fish floating head or not serious normal, should take timely measures.

Principle of using antibacterial drugs

Principle of using antibacterial drugs
(1) the correct diagnosis of the cause, rational use of drugs, strict control of the drug’s indications
Correct diagnosis is the primary condition for successful treatment. The main infectious diseases of fish bacterial diseases, viral diseases. Parasite disease called invasive disease. It is easy to diagnose the disease. It can be found that there is a large number of pathogens by the naked eye or by the microscope. According to the general symptoms of infectious diseases of fish and combined with laboratory tests to determine, but in practice, if we can exclude the parasite can use broad-spectrum antibacterial drugs for diagnostic treatment. After the observation for several days, if the effect is not obvious, it should be considered whether the virus disease, or re adjust the treatment plan. Should pay attention to the need for a certain period of time to play the drug, can not expect the day of the drug can quickly bear fruit. In fact, at one or two days after treatment, there is often a phenomenon of increasing mortality. This may be due to drug pathogenic bacteria in fish kills, prompting bacterial cells and release of endotoxin, acute poisoning caused by the death of the fish, this case is generally 3 – 4 days mortality will decrease, otherwise you should consider whether the drug overdose causes.
In addition, there is often a mixed infection of multiple pathogens in the late course of the disease. The common clinical car caused by grass carp gill rotifers and mixed bacterial infection, grass carp reovirus and gas production of single cell infection caused by enteritis, then there must be treatment options for different pathogens.
The correct diagnosis, selection of drugs according to drug indication, and adopt appropriate methods of administration.
(2) drug use time sooner rather than later fish once the disease, the symptoms appear loss of appetite, not feeding bait, oral drug on it can not afford to use fish in the pond after onset of action why drugs can control the disease? That’s because the drugs that are used to prevent the fish from the onset of the disease have a protective effect, so the real treatment for fish is not. It also shows that the more importance in fish disease prevention measures in yi.
(3) it is important to emphasize the importance of the immune system in the treatment of the disease. It is necessary to realize the importance of the immunity of the fish body.
(4) oral and topical use of drugs, external use of drugs is to play a role in the treatment of drugs on the surface of the body, and oral medication is to play its role in the absorption to control systemic infection. For bacterial diseases, whether it is a surface infection or systemic infection should be taken orally, external use of combination. For the infection of parasites in the body surface can be used only for external use, but sometimes it can also be effective for oral administration.
(5) to observe the effect of treatment in time, if the treatment effect is not obvious, we should analyze the reasons from the aspects of diagnosis, medicine, dosage, administration method, etc.. But should not be too frequent replacement of the drug; using a treatment regimen should be at least 72 hours after the observation to determine its efficacy, otherwise it will only result in drug abuse.
(6) to avoid the generation of bacterial resistance, which requires adequate dosage and treatment, and to pay attention to the use of different antimicrobial agents. Parasite resistance to drugs is also common.

Basic principles of drug use

Basic principles of drug use

Effect of judgment
Drug treatment can be judged from the following aspects: 1, to alleviate the symptoms and reduce the number of deaths. 2, food consumption increased. 3, normal swimming behavior. 4, body-color back to normal.
If antimicrobial treatment failure should be viewed against the following aspects and make medication adjustments: 1, incorrect diagnosis, pathogens are not clear, cause unclear and improper drug selection, 2, although accurate, but due to take chances, delayed the timing, because it’s too serious, most of the fish loss of appetite can not take bait. 3, drug problems, such as lack of effective drugs, or drugs not, or an arithmetical error, or dosing the right way, or using inadequate doses and treatments are not long enough, unable to control infection or cause relapse. 4, no elimination of sources of infection or cause is not eradicated, 5, remove any move sick fish, ponds, removal of stress factors such as illness, an increase in deaths. 6, the body’s defenses lower or disappear, 7, pathogenic bacteria develop resistance. 8, had dual infections. 9, physical and chemical characteristics of seawater and freshwater different, for many drugs (such as copper sulfate, oxytetracycline) efficacy have a great impact, required special attention.

Drug efficacy depends mainly on drug concentration in the blood and its duration, drug concentration in the blood only reaches the minimum inhibitory concentration (the minimum drug concentration required to inhibit the growth of bacteria) or more can play effect. Fish drug concentration in drug formulation, varies with the dose and method of administration, and the species of fish-related. Even the same species, but also because of its size, water temperature, food consumption varies depending on the conditions. In addition, the antibiotic concentrations in the blood are valid, should be based on susceptibility of pathogens. If pathogens are highly sensitive to this drug, the dosage can be less blood levels can be low 1 such as bacteria are only moderately sensitive, in terms of the quantity and blood levels must be high ¥ if the bacteria is not sensitive to drugs, strong resistance, even if the dose is large, nor to inhibit or kill bacteria.