How to cope with drought aquaculture?

After the spring of this year, droughts have occurred in many places in China. The drought in some areas is very serious. When the drought is serious, aquaculture should pay attention. This article provides some reference opinions and hopes to help the aquaculture farmers.

1, when the insecticide is necessary to kill insects. The annual thrilling thrilling festival is a good season for killing insects. This year, the temperature is higher than in previous years. The insecticide can be killed before the convulsions. The insecticide is CuSO4, FeSO4 mixture or trichlorfon. The water temperature is low and the effect is low. .

2, when the sterilization must be bactericidal. After killing insects, they can be sterilized on the second or third day. This will not only kill bacteria, but also improve water quality. Should choose "chlorin killing spirit" and so on.

3, pay attention to improve the bottom water. Due to drought, there are fewer supplementary waters in each water area, so the water quality of the water body is poor, especially the bottom water, and “bottom net No. 1” should be used. Water bodies with poor water quality may use "water quality antidote" or "weak poison water protection".

4, control the amount of feed. Poor water quality, low water volume, good feed control, avoiding overfeeding, leaving behind residual baits after fish ingestion, causing secondary pollution of water quality, and feeding as little as possible to increase feed conversion.

In addition, in the case of drought, it is very difficult for aquaculture farmers to change the water in the pond, and it is very likely to cause an epidemic outbreak of freshwater fish. Now the fish disease symptoms and control issues are introduced to the reader so that everyone can timely Take measures.

First, the incidence. The disease is caused by bacteria. It is the most serious type of acute infectious disease in China with the most damaging types of fish, the largest range of endangered fish ages, the most widespread endemic area, the longest season, the most endangered species of fish farming waters. Also known as bleeding, bacterial septicemia. The disease was more popular in the South 90 years ago. The epidemic in our province has been a matter of recent years. The main hazards of the fish are carp, carp, carp, carp, carp, and grass carp. From summer flowers to adult fish can be infected. In addition to the onset of intensive ponds, cages and reservoir fish farming have also occurred. Severe morbidity is up to 100%, and heavy mortality is above 95%. The epidemic season is from March to November, and from May to September is the peak period. The water temperature is popular from 9°C to 36°C, especially when it lasts above 28°C.

Second, the cause of the disease:

1. The stocking density and yield increased significantly, while the prevention of fish diseases did not increase at the same time. The pond is not dredged for many years and it is not sterilized. 2. Poor feeding and management, aging or deterioration of water quality in fish ponds or reservoirs, low dissolved oxygen, accumulation of harmful substances, and poor water environment, resulting in decreased resistance of fish. 3, long-term inbreeding, physical decline. 4, improper combination of feed, nutrition is incomplete, the fish's resistance decreased. 5. The diseased fish were not properly handled and were thrown around so as to increase the chance of infection.

Third, the symptoms. At the beginning of the disease, the diseased fish were slightly congested on both sides of the upper and lower jaw, mouth, lid, eyes, fin base, and fish body. At this time, there was still a small amount of food in the intestine. In severe cases, the fish's body surface is heavily congested and bleeding. Congested around the eyelids. The eyeballs are prominent, the anus is swollen, the abdomen is enlarged, and there is yellow water or blood in the abdominal cavity. The liver, spleen, and kidneys became lighter and purpuric. Some diseased fish scales are erected, muscles are congested, the wall is congested, and the ends of the silk are rotted. Severe diseased fish do not eat, restless or paroxysmal chaos, chaos, and eventually fail to die.

Fourth, diagnosis:

1. Diagnosis can be made based on symptoms, epidemiology, and pathological changes. 2, the disease should be differentiated from the stress caused by fish stress. Stress-induced hemorrhagic disease occurs when fish is transported densely. The occurrence of this disease has nothing to do with intensive and prominent eyeballs; stress hemorrhagic disease without ocular external protrusion symptoms.

V. Prevention. Prevention of this disease is very important. After the onset, he suffered heavy losses. 1. Thoroughly dredging dry ponds in winter and thoroughly disinfecting ponds with quick lime to improve the ecological environment of the water body. 2. Fish species should be cultivated on the spot as much as possible to reduce transport, pay attention to the disinfection of fish in the lower pond and the lower box. 3, stocking density should be adjusted according to their environmental conditions, feeding and management levels and disease prevention capabilities, can not pursue high density. 4, stocking high-quality fish species, feeding a full-fledged nutrient full feed, improve fish disease resistance. 5. During epidemic season, every half month, 25 to 30 milligrams of lime slurry per liter of Quanhua Quanchiposa to regulate water quality. Pond food or cage disinfection using strong chlorine hanging bags. 6, after the carp into the box, the application of strong chlorine fine hanging bag disinfection, and feeding the Triterpine bait to prevent.

Sixth, treatment. The treatment of the disease should catch the early onset of the disease, that is, when the fish is still able to eat when the favorable opportunity, and pay attention to the combination of external disinfection and internal medicine treatment.

1, in vitro disinfection. Here should pay attention to drug selection, should try to choose the previously used less or not used disinfectant. And use enough, with a full course of treatment. In vitro disinfection can use one of the following drugs.

1 Quanchiposa chlorine dioxide (40% or more of food), 1 to 2 grams per cubic meter, once a day, once every 3 days. 2 Dichlorine is splashed by Quanchipi, and 0 to 5 grams per cubic meter of water is used once a day for 3 days. 3 Bromochlorinate is splashed in the whole pool, and 0 to 5 grams per cubic meter of water is used once a day for 3 days. 4 For cage fish farming, use 10 ppm PV iodine for 30 minutes once a day for 3 days.

2. Oral therapy, choose one of the following methods:

1 Add 0.2 g of virus spirit per kilogram of feed, stir in the feed and feed for 3 days for one course of treatment. Simultaneously feeding compound sulfamethoxazole, the first day of 100 kilograms of fish with 5 to 10 grams, the first 2 to 3 days halved. 2 Efficient treatment of fish fungus spirit, 40 grams per 100 kilograms of fish per day, mix in feed orally, use for 5 days, there is good effect.