Key points of prevention and treatment of crab disease in June

After June, when the hot season gradually entered, the environment of crab ponds began to change, and bacterial diseases of crabs began to occur. According to the investigation, the stocking density in various places is relatively high, and the water quality in many places is polluted, the water exchange conditions are not good, and people do not pay much attention to the use of internal bait. Therefore, black Gill disease, Gill rot disease, shelling failure, ammonia poisoning and so on will occur in large numbers. In view of this situation, the following preventive measures should be taken to reduce losses:

The main results are as follows: (1) regularly sprinkle live bacteria such as Bacillus, water retention biotics, pond bottom clear, nitrification No. 1 and other living bacteria to keep the water quality clean and the sediment clean, which is generally used every half a month. it can reduce the incidence of diseases caused by poor water quality and sediment (such as Gill rot, black Gill disease, ciliosis, etc.).

(2) to strengthen the addition of internal medicine (especially Chinese herbal medicine) in the diet, use Weiming + Jinfang Huganbao + multi-effect anti-poison (or yogurt freeze-drying agent + Jin Wei'an + shrimp and crab fast-growing) every half a month to mix 100 jin of fish or feed, can also process noodles, can effectively reduce the incidence of enteritis, liver necrosis and so on.

If the crabs are fed with small fish, the small fish are soaked and disinfected with euiodine, and then fed to the crabs. The specific dosage is: every 100 jin of fish soaked in 1-2 bottles of iodine for 5 minutes, can greatly reduce the incidence of enteritis, claw disease and so on.

(4) the water quality is tested regularly, once every 10 days. If ammonia nitrogen and nitrite exceed the standard, water retention probiotics (or bacillus) and nitrification No. 1 can be sprinkled in the whole pool.

If there is a disease, you can refer to the following treatment plan for targeted prevention and treatment:

(1) ciliosis

Symptoms: you can see a large number of crabs ashore or climb to the shore, the body surface of sick crabs covered with a lot of brown or yellowish green fluff, slow movement, crabs can not shell, often a large number of death within a few days.

Prevention and control methods:

(1) change water 1pm 3 or add fresh water to keep the water fresh

(2) sprinkle the whole pool with anhydrous zinc sulfate 0.4 ml 0.5 g / cubic water. If you are seriously ill, use it again 2 days later.

(3) on the second day after a large number of crabs were shelled, the crabs were sprinkled in the whole pond or sprinkled directly at the bottom of the pond after being shelled in large quantities, so as to maintain good water quality and bottom quality, which can effectively prevent repeated infection or secondary infection.

(2) Gill rot disease and black Gill disease

Symptoms: Gill blackness, necrosis, decay of abdomen and appendages, slow movement, decreased food intake, foam at the landing port, dyspnea, and a large number of deaths in the later stage of the disease.

Prevention and control methods:

(1) sprinkling in the whole pool (2 MUE 3 mu per bag) to disinfect the water body.

(2) the symptoms can be effectively eliminated by mixing 80 jin of fish or feed with "100g + vitamin free + shrimp and crab fast growth" for 5 days.

(3) Edema disease

Symptoms: abdomen, navel and dorsal shell below swollen and transparent, Gill edema, light pressure with water outflow, sick crabs prostrate on the shore, stop feeding, and finally die in shallow water.

Prevention and control methods:

(1) soak in multi-effect antitoxic water for 2 hours and sprinkle it in the whole pool according to each bag of 2mu.

(2) 100 jin of fish or 100 jin of mixed ingredients or fish in each group, for 5 days as a course of treatment.

(5) unsuccessful shelling disease

Symptoms: cracks appear at the junction of the back edge of the back shell and the abdomen of the diseased crab, and the new black shell can be seen when the back shell is opened, and a large number of people die because they cannot take off the old shell.

Prevention and control methods:

(1) soak shrimp and crab in a fast-growing bag of 2 mu rice water for 2 hours and sprinkle it in the whole pool.

(2) at the same time, "Weifei + Jinfang Huganbao + Pule" was added to the feed, and each group was fed with 100 jin of processed feed for 5 days.

(3) on the third day, it can be sprinkled with calcium and bright shell treasure to supplement calcium ions in the water, improve the water quality and keep the water fresh.

(6) carapace canker

Symptoms: the body surface of the diseased crab is somewhat shaped like iron rust-like erythema, some crabs are accompanied by blackening of the abdomen, stop feeding, and die in large numbers when the disease is serious.

Prevention and control methods:

(1) sprinkle "multi-effect anti-virus" in the whole pool, each bag of 2 mu rice, once every half a month.

(2) sprinkle the whole pool with "detoxifying stress essence" every three days to reduce heavy metal ions in the pool.

(3) take "Pule" (80 jin / bottle) for 5 days and double use for the first time.