Is the Gill of the fish moldy? Can it be saved?

Xiao Bian updated an article on May 19 entitled "Fish gills are black, red and rotten. These should be paid attention to. If you are not careful, you will infect other fish." When it comes to the problem of gill rot in ornamental fish, I believe many fish friends have been exposed to fish gill rot or water mold. However, today, when it comes to this kind of disease, it is a little different from the previous two kinds. The outbreak of water mold is systemic. The early stage of gill rot is similar to gill mold. There is no need to distinguish between the two. The same treatment can be taken. Today we are talking about mold.

Gills mold is caused by gill mold parasitism on the gills of ornamental fish, mainly harmful to koi and goldfish from fry to fingerling stage, mostly occurring in water quality deterioration, especially in water with high organic matter content. Once fish disease is mostly acute, 1~2 days can die, the disease in May ~ October every year in summer and autumn epidemic, especially in May ~ July, other seasons with the temperature drop, then into subacute and chronic.

The pathogen of this disease is branchial mold, mainly including haematobranchial mold and transobranchial mold, which can produce branched hyphae and endospore hyphae without transverse septum. The diameter of mycelium is 6.6~21.6 microns, and the diameter of spore is relatively small, 4.8~8.4 microns, with an average of 6.6 microns. Spores can live in water without host, directly invade fish body or be eaten by fish, enter blood circulation through intestinal lymphatic vessels, finally germinate in gill vessels, develop into mycelium, mycelium extends inward continuously, branches again, penetrates tissues, grows along gill vessels or penetrates cartilage, destroys gill tissues, causes blood circulation disorder, and forms thrombus.

main symptoms

Disease fish gills lose normal bright red and pink or pale, light, visible gills have punctate or massive congestion, like marble-like and present flower gills. The gill filaments are obviously thickened, and the gill lamellae are covered with hyperplasia and hypertrophic epithelial cells. As the disease progresses, the injured tissue decays. The sick fish lost appetite, swam slowly, increased mucus on gills, respiratory disorders, scattered floating on the water surface, then swam rapidly for 2~3 laps, then lost balance, head down, repeated several times, died due to respiratory disorders.

According to the severity of the disease, gill mold can be divided into acute, subacute and chronic three types.

Acute branchial mildew is mostly acute, and a large number of deaths begin 3~5 days after onset, lasting 5~10 days, and the mortality rate is above 60%.

Subacute disease course is longer, necrotic part can be regenerated, mortality is 10%~40%.

Chronic symptoms are obvious, sometimes a small part of the gills necrosis, individual pale, some sick fish gills were swollen at the end.

How to judge?

On-the-spot diagnosis can be made according to clinical symptoms and pathological changes, and further laboratory diagnosis is needed for definite diagnosis.

Laboratory diagnosis A diagnosis can be made by cutting a few decayed gill filaments and observing the presence of branched hyphae under a microscope with a cover glass. If there are conditions, the water quality of the fish pond can be analyzed to see if there is a large amount of organic matter and water quality deterioration.

Prevention points

Regular maintenance of good water quality, stability, timely addition of new water, avoid excessive organic matter in the water, can reduce the chance of disease.

Strengthen feeding management, feeding comprehensive nutrition of high-quality feed, enhance the resistance of ornamental fish.

treatment measures

Fish ponds where gills mold is found should be quickly injected with clean water, or the diseased fish should be moved to thinner or flowing water. The disease can be significantly alleviated, but it is necessary to prevent further spread of pathogens during transfer.

Sprinkle bleaching powder in the whole pool to make the concentration of liquid medicine reach 1 g per cubic meter of water, or sprinkle copper sulfate in the whole pool to make the concentration of liquid medicine reach 0.78 g per cubic meter of water, which has better therapeutic effect.

Also available 5:2 copper sulfate and ferrous sulfate mixture of the whole pool splash, so that the concentration of water solution to cubic meters of water 0.7 grams.

precautions

Note that it is distinguished from bacterial gill rot, parasites such as myxospora, dactylogyrus and Chinese carp caused by gill disease. Bacterial gill rot is characterized by gill decay, severe gill cartilage exposure, and often with sludge, gill cover inner surface congestion, the central epidermis is often corroded into a round transparent small hole, commonly known as "open skylight"; myxosporidium caused by gill disease generally in the gill epidermis tissue there are many white punctate or massive cysts, easy to see with the naked eye. The gill disease caused by ring worm is obviously swollen, the gill cover is slightly opened, the mucus is increased, the gill filament is dark gray, and the long worm body wriggles can be seen under microscopic examination. The gill disease caused by Chinese herring, swollen and white at the end of gill filament, parasitism of many worms, and hanging maggot-like worms, so it is called "gill maggot disease".

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The above content is here, I hope this article can help everyone Oh, if there are deficiencies, I hope you can advise the seniors