Prevention and treatment of common diseases in Pseudosciaena Crocea culture

Benedeniasis

[etiology] the disease is caused by the parasitism of Benedenia.

[symptoms] Benedenia is often parasitic on the body surface of marine fish such as large yellow croaker, yellowfin bream, @ # @ 240 fish, black bream, grouper and so on, especially in the first half of the back. When Benedenia parasites on the fish, the fish are restless in the water, constantly swimming wildly, rubbing on the net or pool wall, the size hook of the fixed plate behind the worm tears the epidermis, the body surface is injured and inflamed, and secretes a lot of mucus. Severe anemia, weight loss, local or large area ulcers or complications such as rotten jaws and tails.

[treatment]

Method 1: soak in fresh water at 10-20 ℃ for 15-20 minutes, water temperature 20-25 ℃ for 10-15 minutes, water temperature above 25 ℃ for 5-10 minutes, this method is labor-intensive, the fish is easy to be injured during operation, and a large number of fish die when the condition is serious, and the injured fish are easy to be complicated with rotten jaw and tail disease after soaking. After washing, a hanging bag of "rich chlorine 1" can be used in each cage to kill bacteria in water and prevent wound infection. At the same time, "Fish Health No. 1-2000" can be taken internally with an addition of 2%.

Method 2: trichlorfon hanging bag, at present, the most commonly used method is trichlorfon hanging bag, but the biggest characteristic of this method is that the concentration of trichlorfon is not easy to grasp, the concentration is too high, it is easy to cause fish poisoning and death, and the concentration is too low to kill Benedens. poisoning accidents are most likely to occur in the summer high temperature season.

Method 3: "Yuchongqing No. 2" hanging bag can dispel Benedenia on the fish, and then hang a piece of "rich chlorine 1" tablet in each cage a week later, which can treat skin and tail complications, and "Fish Health No. 1-2000" can be taken at the same time when the complications are serious. Compared with the former two methods, this method is more safe, reliable, labor-saving and labor-saving, and the deworming effect is better. Fish diseases caused by other worms such as Anchor head worms and third-generation worms can also be treated by this method.

White spot disease (stimulating cryptonuclear disease)

[etiology] the disease is caused by the parasitism of fish that stimulates cryptosporidium.

[symptoms] mainly parasitic on the body surface and gills of Pseudosciaena Crocea, the fish body is covered with small white spots visible to the naked eye, commonly known as white spot disease, often can cause dyspnea, rotten gills, rotten skin, diseased fish floating on the surface, can cause mass death, the harm to seedlings is particularly serious, especially in the seedling cultivation stage.

[prevention]

1. The stocking density should not be too high; 2. Disinfect the seedling pond regularly, and the cage can be hung with "chlorine-rich 1" bag.

[treatment] formalin 15-20ppm medicine bath, the medicine bath changes water for 12 hours; after changing water, you can take 2% of "Fish Health No. 1" or "Fish Health No. 1-2000" to prevent secondary infection; at the same time, cooperate with "rich chlorine 1" hanging bag to disinfect the water body.

Rotifer disease

[etiology] caused by a large number of parasitic rotifers.

[symptoms] the parasitic sites are the fish body surface, fins and gills, especially the Gill, which is more common and serious. The worm is attached to the Gill filament and body surface with an attachment disc, which rotates constantly. The tooth hook of the worm can make the Gill epithelial tissue fall off, proliferate, secrete too much mucus, respiratory disorders, and even rot the Gill, gradually reduce feeding, lose weight, and even lead to death.

[treatment]

1. Treat diseased fish with 25ppm formalin medicine bath for 15-20 minutes.

2. Soak "Yuchongqing 2-2000" 2000-0.2ppm for 15-20 minutes or sprinkle it with 0.15-0.2ppm.

3. After treatment with either method, combined with the use of "chlorine-rich type 1" hanging bag and oral administration of "Fish Health No. 1-2000", intermittent infection can be treated or prevented.

Vibrio disease

[etiology] caused by Vibrio anguillarum.

[symptoms] the main feature is the formation of ulcers in the fish. In the early stage of the disease, the mandible and caudal stalk were red, and in severe cases, the mandible was ulcerated, the caudal stalk ulcer was deep to the muscle, and the caudal fin was ulcerated.

[prevention] one hanging bag of "rich chlorine type 1" is used in each cage to kill bacteria in water. Once every two weeks, "multi-dimensional marine fish" and "special Vc for aquatic products" can be added to the feed to strengthen nutrition and improve immunity.

[treatment] one piece of "rich chlorine 1" hanging bag was used in each cage, and "Fish Health No. 1" or "Fish Health No. 1-2000" was taken at the same time, according to the dosage of the instructions.

Bacterial enteritis

[etiology]

1. Disease outbreaks caused by a variety of infections such as Aeromonas hydrophila.

2. In the process of storage, the protein of chilled fish decomposes to produce histamine, which combines with free lysine to produce "erosive hormone", which causes intestinal ulcer and erosion.

[symptoms] diseased fish swim alone, blackening, loss of appetite, so that they do not eat at all, cut open the intestine, the intestinal wall is locally congested and inflamed, there is no food in the intestinal cavity or a small amount of food in the back of the intestine, and there is more mucus in the intestine. In severe cases, the intestinal tract is purplish red due to congestion, the elasticity of the intestinal wall is poor, there is a lot of yellowish mucus in the intestine and the anus is red and swollen.

[prevention]

1. Strengthen feed management and master the quality of feed.

2. 5 grams of "Fish Health No. 1" or "Fish Health No. 1-2000" and 5 grams of "Marine Fish Multidimensional" were added to each kilogram of feed and fed continuously.

[treatment] each cage was fed with a hanging bag of "rich chlorine type 1", 20 grams of "Fish Health No. 1" or "Fish Health No. 1-2000" and 2 grams of "Aquatic Special Vc" for 3 days. When the disease is serious, bait should be given continuously until cured for another 2 days to consolidate the efficacy.

Hepatomegaly and necrosis

[etiology]

1. Caused by Streptococcus and other bacterial infections.

2. caused by feed poisoning. Due to the feeding of rotten and deteriorated feed, after poisoning, the body was intact, the body color was normal, and he floated or swam to death near the surface of the water.

3. Caused by massive administration of antibiotics

[symptoms] the diseased fish swim slowly, disperse in the slow flow place, float on the water surface, the body color of the diseased fish is black, the Gill is white, the eyeballs are congested and swollen, and there are one or more protuberances on the body surface, especially in the tail, bleeding or ulcers in the protruding parts, and red and swollen anus. Dissection found that the liver was enlarged, blotchy, even necrotic, gastrointestinal hydrops and intestinal wall inflammation. Some have no obvious symptoms on the body surface, but local or large area of the liver is necrotic and enlarged, and there is yellow water in the intestines, and the mortality rate is the highest in the fingerling stage.

[prevention]

1. In the peak season, add 5 grams of "Fish Health No. 1" to every kilogram of feed, continuously feed it, and hang the bag with "rich chlorine 1" at the same time.

2. It is strictly forbidden to feed deteriorated feed.

3. When you get sick, you should prescribe the right medicine. Do not use the same antibiotic for a long time. The continuous use of one antibiotic is generally no more than 5-6 days, so as not to produce drug resistance.

[treatment]

1. Each kilogram of feed was fed continuously for 3-5 days with 10 grams of "Yugankang" and 5-10 grams of "seawater fish Duowei" (5 grams of surimi, 10 grams of powder and granules).

2. If the feed quality is poor, the feed should be changed immediately, and "seawater fish multi-dimensional" should be added to the feed at the same time, as above.

The above diseases are the most common diseases in large yellow croaker culture, in addition, there are nutritional diseases, precocious puberty and other diseases, after recent years of treatment practice, but also achieved certain results.

Nutritional deficiency

[etiology] single feed, incomplete nutrition, and multi-vitamin deficiency and other reasons.

[disease] the body surface of fish is black or normal, thin, some eyes protruding, slow growth, most diseased fish suffer from fatty liver syndrome, if you encounter external stimuli, such as water quality mutation, cooling, net pulling and other stimulation, the stress ability is poor, there will be a large number of deaths. Spraying irritating fungicides and pesticides can also lead to death.

[prevention] add multi-dimensional marine fish to the feed for a long time, adding 5 grams of "marine fish multi-dimensional" per kilogram of feed.

[treatment] 10 grams of "Marine Fish Duowei" and 3 grams of "Aquatic Special Vc" were added to every kilogram of feed, and continuous feeding could treat the disease.

Drug poisoning

Due to the lack of general knowledge of drug use, some farmers cause fish poisoning by misusing drugs during the treatment of fish diseases. there are mainly the following situations:

First, after the occurrence of fish disease, the use of large doses of antibiotics or a variety of pesticides will lead to a reduction in fish intake or no food intake.

Second, excessive use of trichlorfon. Most farmers use trichlorfon hanging bags to treat parasitic diseases, but trichlorfon is very toxic, light so that large yellow croaker does not eat, heavy, it will cause a large number of fish poison death. However, trichlorfon has no effect on protozoa such as cryptosporidium, valvus, rotifer and so on. It is recommended not to use organophosphorus insecticides such as trichlorfon blindly.

Third, too much trichlorfon is used in the surrounding water. Some farmers will die in large numbers without using any drugs (small fish are particularly sensitive). According to analysis, it may be caused by the extensive use of trichlorfon in the surrounding water. Excessive use of trichlorfon can form a high concentration in local waters or an oil film on the surface of the water, and it spreads in the surrounding aquaculture waters due to the fluidity of sea water. Once a water body reaches a lethal concentration due to water flow, it will cause poisoning and death of fish in this area of water.

Symptoms: the fish body swims weakly, floats on the water surface, does not feed or eats very little, if the oil film is formed on the water surface, blocking the exchange of oxygen, young fish will also die from hypoxia.

[treatment] take the trichlorfon from the hanging bag out of the water body, remove the oil film on the water surface with a sand cloth or sprinkle a small amount of quicklime on the surface of the cage to remove the oil film on the surface of the cage, so as to increase the exchange capacity of sea water in the cage. After the implementation of the above measures, and then take "fish liver Kang", "seawater fish multi-dimensional" for treatment.