The decline of feed quality leads to the pathological changes of internal organs of aquaculture animals. The damage of internal organs also leads to a serious decline in the disease resistance of farmed animals, which causes serious damage to the disease.

First, the decline in feed quality leads to the disease of the internal organs of farmed animals

There are many factors that cause the disease resistance of aquaculture animals to decline. The deterioration of water quality is one of them. The decline of feed quality leads to the damage of internal organs, which is the main factor for the decline of disease resistance of cultured animals.

1. In recent years, the raw materials of feed have increased sharply, and the pursuit of maximizing investment benefits has been the consistent aim of the manufacturers. Too much low-quality raw materials have been added to the feed, which has led to a serious decline in the quality of the compound feed for fishing and an imbalance in nutrition;

What's more, too much fish ingestion and even toxic raw materials such as cottonseed cake are added to the feed, which makes the internal organs of the farm animals, especially the severe lesions of the liver and gallbladder, cause the decline of the cultured animals, anti-stress and resistance. The disease ability is weakened.

2. With the gradual increase in the price of compound feed and the continued sluggishness of commodity fish prices, many farmers are looking for alternative feeds that are cheaper, such as poultry feed, slaughter scraps, sick and larvae, and hatching. Feeding aquaculture animals instead of fishing compound feeds, such as chickens or ducklings;

The feed nutrients of the feed are unknown, the ingredients contained in the feed are unknown, and the nutrients are unbalanced, which seriously damages the internal organs function of the cultured animals, causing damage to the internal organs of the liver and gallbladder, resulting in decreased disease resistance of the cultured animals.

3. The farmer's excessive attention, excessive worship of the efficacy of drugs to prevent and treat diseases, blindly add Chinese herbal medicines or antibiotics to the feed for normal feeding, thinking that daily oral administration of drugs can prevent diseases, so that the liver of farmed animals has been detoxifying and functioning. Day after day, liver necrosis is serious, and eventually the disease resistance of farmed animals is seriously reduced.

Second, the disease resistance of internal organs is reduced, causing serious harm to the disease

Surveillance found that every time the outbreak of aquaculture diseases, the serious damage is the culture of animal internal organs, especially the hepatobiliary disease.

The laboratory test also showed that there were some lesions in the internal organs of the disease, and the liver and gallbladder lesions were more serious. The liver was necrotic, brittle, and the liver and liver tip were swollen. These indicate that the internal organs of the liver and gallbladder are the main factors that cause serious damage to the disease.

1. In August-November 2010, we investigated the hazards of tilapia culture in Nanning and other places. It was found that the hepatobiliary lesions were severe and the mortality rate was high, while the relatively mild ones had a relatively low mortality rate.

For example, the 100-mu pond in Nanxiang, a farmer’s household in Hengxian County, raises tilapia in a single pond, and the stocking is 1,450.

On August 23, the disease occurred 300-500 dead fish per day, and the tail weight of dead fish was about 300 grams. The liver disease of the diseased fish was severe, the liver was very fragile and the necrosis was serious. Although measures were taken on August 27, the effect was not Good, more than half died in mid-September, and there are few left in early October.

The tilapia, which is less than 100 meters apart, is raised in a 20-mu pond, and 1200 fish are stocked in acre.

On August 26, the disease occurred 80-150 dead fish per day, and the tail weight of dead fish was about 350 grams. The liver of the sick fish was mildly diagnosed by the necropsy. The liver color was normal and the liver tip was slightly swollen. It was taken on August 30. Shangchanglong has the same measures, the curative effect is remarkable, the medication is controlled for a course of treatment, and the disease is less than 30%.

2, 6 acres of ponds in the Mugen Village, Rendong Town, Renzhou Town, Yuzhou District, farmed with 6 acres of ponds, 1100 fish, and have been fed hatching chicks and ducklings or slaughter scraps, January 2010 On the 10th, the disease was sent to the laboratory of the Guangxi University of Science and Technology on January 14th. The diseased fish disease was a rotten tail. There were many ulcers on the body surface, swelling of the body, white hair and large area necrosis. On January 16, According to the laboratory recommendations for medication, continuous treatment for 10 days, the effect is not good, the dead fish has not stopped, by the end of October, has died more than 70%, all died in mid-November.

Third, measures and countermeasures

1. Feeding high-quality feed is the best measure to maintain the strong disease resistance of farmed animals. For the feeding of special compound feed, it is advisable to choose 2-3 high-quality brand feeds mixed or alternately fed; feeding wild fish, snails and other chilled feeds, first remove the cockroaches, internal organs or shells, etc. Feed, feed after conditional ripening. It is forbidden to feed unidentified feed containing medicinal ingredients such as slaughtering waste, sick and dead poultry.

2. Scientific feeding of feed is a key measure to maintain the strong disease resistance of farmed animals. As far as possible, timing, quality, and quantitative feeding, feeding 2-3 times a day; daily feeding amount is 2.5-3% for special compound feed and 5% for chilled feed. At the same time, every 20-30 days, feed the feed to stabilize the vitamin C or Astragalus polysaccharide, once a day, even for 5-7 days.

3, always remember that the drug is three-point poison. Whether it is insecticides, disinfectants, internal medicines, tonics, health supplements, or Chinese herbal medicines or western medicines, it is toxic to aquaculture animals. Long-term use can cause damage to the liver and other internal organs of farmed animals. . It is necessary to regularly mix the feed with drugs to prevent and treat diseases. The time for taking the drugs per month should not exceed 15 days, so that the internal organs of the farmed animals can be protected from the poisoning of the drugs for 15 days, and the strong resistance of the farmed animals can be maintained.