"The incidence of jaundice in the spring is relatively high and must be carefully bred to the jaundice. Especially if you just started breeding, you must pay attention to careful management." On April 17th, the author looked at the Huanghua Village Group 2 in Huguoguo Town, Naxi District, Chenzhou City. In the village, Wang Zhaohua, the farmer of the Huangxi village, is managing the seedlings he has just put into the cage. After Chen Chaohua, the aquaculture technician of the town heard about it, he also rushed to the scene to guide the farmers. According to Chen Chaohua, “Huangqi is suitable for 15°C～ It grows in water temperature of 30° C. Because of the small area of ​​Dianchi Lake, the water temperature changes greatly between day and night, and with the temperature rising gradually, it is particularly critical for the growth of Scutellaria baicalin seedlings to master the breeding techniques. For example, when the water temperature drops sharply at about 4°C, it is easy to cause earthworms. "Fish 'cold', sudden changes in the weather may also cause diseases." To this end, Chen Chaohua on the scene for Wang Zhaohua introduced the key technologies for the spring breeding of astragalus:
Feeding and feeding
The first species to be placed in cages must be tamed. Method: Do not feed bait before 3 days before stocking, and start feeding at night after the operation is normal. Feeding the bait is to choose the most suitable food, such as alfalfa, small trash fish, and river clam, etc., and adopt a small number of methods. After that, gradually increase the feeding time every day until normal feeding. In this stage, you can mix and serve in the bait (increase food mother powder, appetizer detoxification or synergistic incentive yeast, jaundice electrolysis multidimensional, immune polysaccharide, Ji Ansu). After the squid has formed a good feeding habit, you can slowly add artificial granules to the quail larvae to feed them together. The proportion of artificial diets is gradually increased by adopting a method of gradually reducing the amount of artificial rations. The final ratio is controlled at 1 kg. Fresh bait with feed 1 ~ 2kg, fed twice a day, to 6 ~ 7 hours, 17 ~ 18 hours is appropriate. The total amount of feeds per day is calculated from 2% to 3% of the body weight at the beginning, and gradually increased to 6% thereafter. Feeding method to gradually feed effect. The fresh fish and other fresh baits purchased in the market must be washed before feeding. At the same time, 1 mL of fresh bait added (Baicao Immunity) is sterilized and sterilized for half an hour to kill the pathogens.
Daily management
The cage body culture of Astragalus has a certain degree of fatness, and the transparency must be controlled within 15 to 20cm. Over-clearness of the water affects the growth of Astragalus membranaceus. In order to improve the water quality and improve the utilization rate of ponds, the pupa, oysters, clams and grass carp should be raised outside the box in a timely manner. Observe the ground regularly to check the bottom of the tank periodically and find that the dead fish is removed in time. In the event of a cage rupture and the onset of jaundice, repair and treatment should be carried out immediately. During high temperatures in summer, squid eat well, excrete a large amount, and water quality is easily corrupted. This stage should be mainly controlled by water quality and summer cooling. Remove the bait in time every day, clean the nets when necessary, and change the bottom layer when changing the water. For those with poor water quality and aging of the pool, they should be used frequently (detoxification, diarrhea, effervescence) , Chlorine Dioxide tablets, Detroit's King or super strong bottom Shuan, etc.). The plants in the tank must also remove the aging part, promote the growth of new grass, and enhance the water purification function of aquatic plants.
Disease prevention and control
Disease Prevention and Control Several diseases that are most popular in spring jaundice:
Tail disease: At the beginning of the disease, the tail of jaundice was congested and inflamed, necrosis and ulceration of muscles occurred, and the reaction was slow. When the tail was rotted severely, it eventually died of inactivity. Control methods: Prevent damage to the seedlings during transportation. Stocking density should not be too large, pay attention to changing the source of clean water. With Quanling Quanchiposa spilled.
Turnip disease: At the beginning of the disease, erythema of various sizes appeared on the body surface of the jaundice, and the punctate congestion and inflammation were noticeable on both sides of the abdomen, and the swimming was weak. In severe cases, the epidermis of the diseased punctate ulceration, irregularly shaped holes in the body, and viscera and death. Control methods: Thoroughly clear the pool with quicklime to eliminate pathogens, maintain good water quality, and prevent pollution. Every cubic meter of water in the spring is sprayed with 5 to 10 ml of Quan Zhi Ling and used for 3 days as a course of treatment.
Cold: Due to the large temperature changes in the spring, it is easy to cause colds in the jaundice. When changing the water, pay attention to the temperature difference can not be too large, can prevent the occurrence of the disease.
Intestinal disease: sickness loss of appetite, slow swimming, dark body coloration, abdominal enlargement, anal swelling. Local or total intestinal congestion and inflammation. Control methods: strengthen feeding, do not feed rotten bait. Every cubic meter of water body is immersed with 1-2 grams of bleaching powder or 10 grams of quicklime for 5 minutes. The herring is transferred to a stop-mix feed for 3 days.
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