Aquatic bacteriosis of brocade carp

The term "mycosis" is often heard, and there are many examples showing that even mammals led by humans are difficult to cure the disease. The so-called "fungi" mainly refers to algae and fungi, or aquatic bacteria and filamentous bacteria that belong to incomplete fungi. This fungus is attached to the remains of animals and plants, and uses the remains as a source of nutrition to grow linear hyphae. This kind of hyphae belongs to inferior plants that do not contain chlorophyll. According to the report of the Society, there are more than a dozen kinds of hyphae, such as aquatic mycosis. What I would like to discuss here is that aquatic bacteriosis, which occurs from late autumn to overwintering, is also commonly known as "spondylosis" or "mud covering disease".

Feed and water quality management

It has come to the season when the water temperature begins to drop, and this is also the time to make the koi beautiful in color and strong in shape, so that they can enjoy the results. When feeding pupa and other high-protein bait, wearing a short-sleeved shirt will feel slightly meaningful. If the water temperature drops below 22 degrees Celsius, it should be replaced with ordinary bait as soon as possible. In order to make koi have more appreciative value, it is best to reduce the amount of bait. During this period, if you reluctantly feed too much bait, it will cause a variety of organ disorders when overwintering, and there is a risk of feeding failure.

Generally speaking, in about three months to stop the color of the bait, and to feed ordinary bait, the amount of feeding should also be gradually reduced. In this way, carp can be raised very beautifully. The necessary condition at this time is that the feeding water should be maintained in good condition. So far, we should have fed a lot of bait and excreted a lot of food. It is necessary to see if the filter is functioning properly. In addition, when the temperature difference between day and night is large, we should try to control the temperature difference at about 2 degrees Celsius. Adjusting the amount of new water is also a way.

Onset of disease

This is an aquatic bacteria wanderer (an asexual spore that moves by flagella) that often exists in a wide range of waters, adheres to the traumatic parts of carp and uses its necrotic tissue as a source of energy to reproduce, causing disease. In addition, this kind of aquatic bacteria is also known as "rotten parasitic bacteria".

Injuries caused by aquatic bacteriosis are caused by rough handling of koi, bitten by weasels, marten, or bruises caused by parent carps during natural spawning. Aquatic bacteria breed on this affected area. As the aquatic industry has been seriously damaged by aquatic bacteria, from farmed salmon, shrimp trout to soft-shelled turtles, the range of damage is very wide. As a precaution, the anti-mildew agent malachite green can be used.

Symptom

Aquatic bacteriosis mainly occurs from late autumn to overwintering at a low water temperature (below 15 degrees Celsius). However, in the early summer of the spawning period, parent carps sometimes form abrasions due to unexpected obstacles such as roots or branches when they lay eggs naturally. if left untreated, the symptoms will soon become serious, and the parent carp will die. and suffer heavy losses. Pay more attention to it.

There must be necrotic tissue in the trauma site, with necrotic tissue as the source of nutrition, the wanderer attached to the wound will gradually invade the surrounding tissue and expand the affected area. The wound will grow in lumps of white and long hyphae peculiar to aquatic bacteria, as if attached to white woolly hairs. Therefore, it is commonly known as "spondylosis" or "mud mulching disease".

In the case of chronic symptoms, when touching the affected part (palpation), the koi muscle will feel slightly stiff, which is because the hyphae propagate and elongate in the muscle. As the disease lengthens, the hyphae elongate and invade important organs. At this point, the koi will rapidly weaken and die.

Treatment.

The anti-mildew agent malachite green is very effective in inhibiting the development of aquatic bacteria, so in the past, the aquaculture industry, led by artificial insemination of salmon fishes, likes to use the anti-mildew agent malachite green to prevent it. Pigments decompose rapidly in the sun, so it is common sense to scatter malachite green on sunny days at dusk and cloudy days.

[medicine bath for a long time]: put 0.2-0.3 malachite green into each ton of pool water for 24-48 hours.

Please adjust according to the size or symptoms of koi. If this agent is used for a long time, it will sometimes accumulate in the body of koi, and many literatures have pointed out that malachite green has carcinogenic properties. Therefore, the concentration and bath time will be accompanied by danger. I hope you should pay more attention and handle it carefully at the same time. When emergency treatment is given to most koi, this medicine can be used for medicine bath. As for the trauma area visible to the naked eye, it is necessary to apply Isodine with iodine as soon as possible. Treating trauma as soon as possible is a necessary condition for the family of love carps.

After suffering from porostomia and trichomoniasis, part of the muscle of koi is exposed. Moreover, when the water temperature is low, the wanderer will also be attached. Therefore, it is necessary to use skimmed cotton to remove moisture from the affected area, and then apply Isodine solution. It not only has the effect of sterilization and insecticidal, but also can promote the regeneration of new granulation tissue.

As for other treatments, for koi whose affected parts are relatively small and their physical strength has not yet declined, they can apply 3% or 5% potassium permanganate solution and Isodine solution to the sores several times. In this way, the mycelium will gradually die and the dirt can be removed at the same time. Therefore, the feeling of uncleanliness in the affected part will gradually disappear. When using antibacterial agents, liver-strengthening agents and vitamins for injection at the same time, you can recover as soon as possible. However, if the affected part is stiff and the koi is treated too late, the recovery will be poor.

Matters needing attention when making parent carp hatch larvae

It seems that many people are very interested in making parent carps hatch larvae or cultivate young carps. If you want to cultivate young carp, you must first sprinkle lime in the spawning pond to adjust the water quality containing aquatic bacteria. Moreover, algaecides should be used to inhibit the reproduction of all kinds of algae. If you have no experience, you will sometimes fail miserably. You might as well ask your seniors for advice on this issue.

Using tap water, the number of bacteria will be relatively small. On the other hand, there are often wanderers of aquatic bacteria in rivers or springs. However, even if good quality water is injected into the spawning pond, after five days, a variety of organisms harmful to juvenile carp will increase sharply.

A week before the scheduled spawning day, after sprinkling the right amount of lime in the spawning pond with both PH adjustment and disinfection, use sunlight to dry it that day, and do not scatter lime until the spawning day. If algaecide is used, the work should be stopped more than three weeks before the scheduled date of spawning. In addition, water injection should also be stopped about three days before the scheduled day for spawning. When the parent carp is put into the pool, the ideal water temperature is 15-17 degrees Celsius.

Natural spawning targets the period from late May to early June, when there will be large bands of high pressure in the sky. In the few days from spawning to hatching, there is no sharp drop in water temperature, which is an absolutely necessary condition to improve the hatching rate. Therefore, we must always pay attention to meteorological information.

In addition, during the period before spawning, the water temperature does not change abruptly in a pool of about 12-17 degrees Celsius, and a number of fresh field snails are fed every day to maintain and enhance the physical strength and energy of the parent carp. Once the meteorological conditions are close to the ideal state, the scheduled day for spawning is three days later, and water should be injected into the pool as soon as possible. Gently put the parent carp into the spawning pool the morning before the scheduled spawning day (around 8: 00 a. M.). As it is sunny, the water temperature will rise by 5-6 degrees Celsius from morning to dusk. As a result, the water temperature is usually between 18 and 23 degrees Celsius, which can be said to have reached a temperature suitable for spawning.

Once this excellent water temperature is reached, around five o'clock in the afternoon, the parent carp will begin to get restless and swim around the pool, looking for a place to lay eggs. This kind of behavior is called "nesting behavior", and the female carp is particularly active. At this point, if nesting (chemical fiber brocade) is quickly put into the pool, the parent carp will lay eggs at dawn and end after 2 or 3 hours. Although it is said to lay eggs, but there are a lot of azoospermic eggs or immature eggs that stop development, which will become the breeding base of aquatic bacteria and adversely affect the fertilized eggs. Therefore, be sure to sprinkle 0.3ppm 's anti-mildew agent malachite green in the pool at dusk the day before the scheduled spawning day.

If the female carp has the behavior of "nesting", it will certainly lay eggs the next morning. However, if the female carp is in poor health, it must be fully observed for the rest of the day. In addition, if you still do not lay eggs on the fourth day after water injection, you must give up and change the water in the spawning pool and start all over again! After water injection, it takes a long time to lay eggs, if you do not use anti-mildew agents, either the hatching rate is significantly reduced, or there are frequent pests. As a result, sometimes even a juvenile fish cannot survive.