What disease is easy to suffer from breeding crayfish in May? How to prevent and cure?

Crayfish farming has become more and more popular in recent years, but there are often some diseases to interfere with crayfish production in the specific breeding process. The peak period of crayfish morbidity and death is at the end of April and the beginning of May every year. Shrimp ponds have a wide range of diseases and high mortality. Some ponds even appear "empty ponds" for a week or so, which brings serious losses to farmers. What disease is easy to suffer from breeding crayfish in May? How to prevent and cure?

What disease is easy to suffer from breeding crayfish in January and May?

"Wheat yellow, fish death", the peak period of aquaculture disease is from April to June every year. During this period, there were many kinds of diseases, rapid onset and high mortality, which caused great losses to aquaculture. Lobster farming is the same, during this period, the incidence is very high, many deaths, known as the "May curse".

The main results are as follows: 1. If the pH value in the pond exceeds the standard, it is easy to lead to crayfish not shelling, slow growth, metabolic disorder, poor feeding, climbing ashore and so on.

2. If the ammonia nitrogen and nitrite in the water exceed the standard, diseases such as rotten Gill and tail of lobster may occur.

3. If the bottom of the lobster pond deteriorates or there is something wrong with the bait, it is easy to cause lobster enteritis.

4. The coverage rate of aquatic plants is too large (the coverage rate is generally 30%-55%), resulting in lack of oxygen at the bottom, resulting in a large number of dead shrimp or shrimp can not be caught.

5. If the deterioration of the water body is serious, there will be some phenomena, such as lobster floating head, abnormal landing, weak vitality of shrimp caught, and so on.

6. There is less natural bait in the lobster pond, which is easy to appear soft shrimp and the survival rate is low.

7. The lobster pond was changed from the rice field, but the detoxification treatment was not done in the early stage, and the disease broke out in the hot weather in May.

8. The coverage rate of aquatic plants in the pond is too low, the water quality is not fresh for a long time, and the water level is not enough, so it is easy to appear small steel shrimp.

9, blue-green algae and other outbreaks, in the lobster culture pond to produce a large number of toxins, resulting in lobster death.

There are many other cases, such as hepatopancreatic disease, white spot disease, carapace ulcer, only dead prawns, undead prawns, white prawns, blackening, and so on. This can be called the May Curse.

II. Preventive measures

1. Supplement calcium regularly, promote crayfish to molt, shorten the time of molting and hard shell, and reduce cannibalism.

2. Regularly change the bottom, detoxify, transfer water, decompose the bottom residual bait feces, and inhibit the breeding of bacterial eggs.

The disinfection work should be done in advance at the end of April and the beginning of May.

4. Control the amount of feeding, do not feed too high protein feed, and regularly take drugs (vitamins, lactic acid bacteria and liver protection and gallbladder protection) to improve the immunity and disease resistance of shrimp.

5. When getting up shrimp, try not to get up every day, get up for three or four days, stop for two days, and bask in the ground cage to reduce the degree of damage to shrimp seedlings as much as possible.

6. Maintain the aquatic plants and mow the grass head in time.

7. Change the water regularly and deepen the water level appropriately.

In short, shrimp culture is also the first to raise water, water quality is the key, crayfish living environment is better, the natural incidence rate is lower, the success rate of treatment is higher.