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Eight diagnostic methods for fish disease

 Encyclopedia has introduced eight diagnostic methods of fish diseases, rotten tail and fins, fish parasitic diseases and other diseases in this article. For more common fish diseases, please continue to pay attention to this site! 
Ornamental fish Many ornamental fish farmers should have experienced the treatment of ornamental fish infection or the death of ornamental fish. Many times 

I. Characteristics of ornamental fish to judge disease

  When an abnormality occurs in ornamental fish, it may not necessarily be sick, but it may also be hypoxia, hunger, or fighting, but it can be judged as long as the following conditions occur: First, the rapid death, ornamental fish appears in a short time A large number of deaths; second, the symptoms are the same, under the same environment, all the ornamental fish show the same symptoms, development process and onset time; third, the recovery is extremely fast, when the environment changes, the fish can return to normal in a short time .

Judgment on the occurrence time of ornamental fish diseases

  The occurrence of diseases has a strong seasonality, and some diseases only occur in a certain season. This is because each pathogenic bacteria has a variety of seasonal conditions suitable for their own growth needs, so seasonal characteristics should be considered in the diagnosis of ornamental fish diseases. For example, water mold generally does not occur in summer, but spring It is the season of water mold.

3. Judgment on the occurrence area of ​​ornamental fish disease

  Fish disease has certain regional characteristics. When buying ornamental fish, you can inquire about the source of the ornamental fish. If it is a fish sold from a breeding base, it may carry germs and be infected with various diseases. In general, the local self-cultivated ornamental fish has good adaptability and few diseases.

Fourth, judging the symptoms of ornamental fish disease

  This is the most direct method when diagnosing a disease, but there are many areas that need attention, and lack of experience is likely to cause misdiagnosis. Because different diseases may have similar symptoms in the same ornamental fish, or the same disease may have different symptoms in different fish, other factors must be combined to judge according to the symptoms.

FIVE. Judgment of Ornamental Fish Varieties and Growth Status

  Different species of ornamental fish have different resistance to disease, and different resistance to disease at different growth stages. Some targeted diseases have obvious targeted characteristics that cause harm to only one species of fish. These characteristics can be used as the basis for direct judgment of the disease.

Observe ornamental fish in water

  Ornamental fish are usually kept in small water bodies such as aquariums, fish tanks, indoor and outdoor cement ponds. Once a fish disease occurs, it is easy to be found and it is easier to observe directly. Some of the more obvious fish diseases are easy to do in combination with field investigation and analysis. Out diagnosis. This is not possible in large water bodies. Observation in water is an important step in diagnosing ornamental fish disease.
  First observe the fish's activity in the water. If floating head symptoms occur, give it a shock before entering the water. After a while, it floats up again, and there are no other symptoms on the body surface. Water quality factors such as hypoxia and excessive ammonia nitrogen content should be considered. , Slow response, or irregular roaming, imbalanced balance, asymptomatic body surface, should be considered as parasite infection or water pollution; secondly, carefully observe the mouth, eyes, gills, scales, fins, anus and other body surfaces of diseased fish Characteristics. Generally speaking, bacterial and viral fish diseases often show symptoms such as hyperemia, inflammation, rot, basal congestion of fins, fins, and vertical scales, while parasitic diseases often show increased mucus, haemorrhage, Symptoms such as punctiform or massive cysts. The eyes of the sick fish are white and proliferative, which is a symptom of blindfold disease, mostly caused by poor water quality. Sick fish has an enlarged abdomen, red and swollen anus, and excretes a white slender stool. It is a sign of enteritis. The appearance of lumpy dough-like flocs on the body surface is a symptom of water mold.

Seven, visual inspection of ornamental fish

  When the sick fish have no obvious symptoms in the water or the suspected diseased organ cannot be observed in the water (such as the gills), they should be checked out of the water. Use fishing nets or gauze pockets to carefully remove sick fish for visual inspection, and strive to be stable, accurate, and fast. The shorter the time, the less damage the ornamental fish will cause. First check the body surface and further check on the basis of observation in the water. If the body surface is inflamed, congested, and rotten, gently lift the scales with tweezers and observe whether the nematode parasite is underneath. If no parasite is found, other conditions can be diagnosed. Virus or bacterial fish disease; if the scales are upright and there is a sense of swelling with your fingers, you should be diagnosed with vertical scales. If there is a lot of mucus on the surface of the body, the end of the fin is rotten, and the congestion of the fin base may be a fish disease caused by parasites. Further microscopy is required to confirm the diagnosis. Secondly, perform a gill inspection, first check one side and the other side, open the gill cover with tweezers or hands, and observe whether the gill slice is abnormal in color, there is more mucus, and the end of the gill silk is swollen and rotten. The end of the gill filaments is rotten, there is more mucus, and there is sludge attached. If it is a fish disease caused by protozoa such as wheel worms and waveworms, the gill flakes are dark and there is more mucus. If it is ringworm, Chinese Large parasites, such as tadpoles, show symptoms such as enlarged gill filaments and open gill covers.

Eight, microscopic examination of ornamental fish

  Microscopic examination is a reliable guarantee for the correct diagnosis of fish diseases. Some fish diseases are caused by several pathogens at the same time, while others are manifested by several diseases at the same time. Generally, microscopes are required to correctly diagnose them. It is feasible to use the biopsy method instead of the conventional anatomical microscopy to diagnose common diseases and multiple diseases. Because the tissue regeneration ability of fish is strong, a small piece of tissue (such as fins and small gills) does not affect the function of the fish's organs or affect the ornamental effect. As the sick fish recovers, the damaged tissue will heal quickly. The test method is to take a small piece of tissue or mucus from the lesion with a small scissors or tweezers and place it on a glass slide. Drop a small drop of water or physiological saline, cover the cover glass, gently flatten it, and observe it with a low power microscope first. If you find a pathogen or a suspicious phenomenon, then carefully observe it with a high-power microscope. For the entire diseased part or organ, you should check a few different points in order to grasp the overall situation.
  When inspecting ornamental fish diseases, we must consider the disease status of ornamental fish from various aspects. It is best to have a reasonable basis to judge the disease of ornamental fish. Do not use drugs blindly. If you cannot determine the disease, it is best to consult more experienced farmers to avoid delay in treatment.
I believe everyone already knows about the eight diagnostic methods of fish disease. If you want to solve the problem of fish love, please come to Fish Encyclopedia to find relevant information!

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