Causes and Solutions of Shrimp Seedlings
I. Causes of shrimp ponds 1. Hunger: Because of the lack of natural food, and the lack of feed, the shrimps have been swimming due to hunger. This kind of swimming pool has certain directionality. 2. Infectious Diseases: Due to some diseases, shrimp swim in the pond due to discomfort. 3. Deterioration of water quality: shrimp ponds are caused by deterioration of water quality and sediment quality, especially when the weather changes or there is a large amount of zooplankton water in the water. 4. Hypoxia: Due to the decrease of dissolved oxygen in water, shrimp seedlings roam on the water's edge due to lack of oxygen. 5. Emergency: Due to changes in the weather and water quality, the shrimps are in an emergency state and swim in the pond due to an emergency. 6. Poisoning: The body of water enters toxic substances, and shrimps swim in ponds due to poisoning. Second, the solution 1. The swimming pool phenomenon caused by hunger has obvious group travel, and this phenomenon often occurs within half a month of the shrimp pool. Therefore, in the early culture, the scientific feeding should be carried out according to the bait in the shrimp pond. It is necessary to ensure the nutrient demand of the shrimp and satisfy the praying requirements of the shrimp. It is recommended that early feed should be fed with suitable diets such as surimi, soymilk and microgranule feed. If it is found that the feed is insufficient, that is, after the feed has been dropped for 1 to 2 hours, the shrimp has more empty stomach or semi-gastric phenomenon, the feeding amount should be increased. Especially in the early stage of stocking, attention should be paid to feeding high-quality feed and grasping appropriate conditions. The amount of feed; when the water quality is thin, it should be promptly fertilizer. 2. Improve water quality and bottom quality. Before the stocking of the shrimp, it is necessary to adjust the water quality, treat the sediment, and pay attention to the fertilizer. In the breeding process, the water quality and sediment modifier should be used regularly, and other measures (such as changing water and oxygen) should be taken. Improve water quality and bottom quality. 3. The phenomenon of swimming ponds caused by lack of oxygen may occur during the entire breeding period, due to high breeding density, excessive feeding, deterioration of pool water, dark or thick water, and prone to occur after thunderstorms occur in the evening. Most of the recreational ponds occur in the wee hours, and sometimes they start in the middle of the night and even in the daytime. Preventive methods: 1 regularly use the substrate and water quality improver (such as photosynthetic bacteria), used once every half months, adjust the amount of use according to the water quality; 2 strictly control the amount of feeding, to ensure that there is no residual bait 1.5 hours after feeding and 7 ~ 8 pairs of shrimp can be full stomach; 3 promptly open the aerator, mechanical oxygen can also produce water, prevent shrimp ponds appear dead water and promote the growth of shrimp oyster shell. 4. In the course of aquaculture, the occurrence of diseases should be strictly prevented. Once diseases are discovered, timely measures should be taken for treatment. The phenomenon of swimming ponds caused by pathology is often found in various typical pathological features of the larvae, hepatopancreas, gastrointestinal tract, and body surface of shrimps. The diseased shrimp swims on the surface of the water due to lack of oxygen and roams until it finally dies. Such swimming pools are hazardous and have a wide range. Judgment method: 1 swimming ponds caused by bacterial diseases such as black peony root, yellow peony root, rotten leeches, black spot, and enteritis, can be diagnosed according to the abnormalities of the scorpion and feces of shrimps. 2 The most common cause of parasites in Penaeus vannamei is the ciliate disease. The disease is observed under the microscope in the early stage and is visible to the naked eye in severe cases. 3 The most harmful, most widespread and most costly loss to farmers is the viral disease, namely red body disease and white spot disease. Judgment of red body disease can be based on the following three conditions: The first point of view is that the body is not red, the second point is whether there is food in the stomach, and the third point is that the head thoracodorsa is not easily stripped. If the above three points are available, then it is an acute red body disease; if the first two points are satisfied, it is a chronic red body disease; if only the first symptom is met, it may be an emergency red body. In the early stages of white spot disease, the spots are small and must be observed with a microscope. After the middle and late stages of peeling off the starting breastplate, plum-like or dot-like white spots can be seen toward the light. If there are black spots or even perforations inside, it is acute. White spot disease. Prevention and control measures: 1 Regularly use disinfectants, timely application of microbial agents to maintain the microecological balance and stability of the pond. 2 Regularly use Vc, allicin, Huganbao and other internal medicines to improve the disease resistance of shrimp; 3 The swimming pool phenomenon caused by parasite can be sprinkled with shrimps, crabs, fibrin nets, etc., and at the same time internal administration of capsin and Vc, prompting Prawn shells. 5. Usually pay attention to the use of biological agents to regulate water quality, prevent sudden changes in water quality, attention to changes in the weather when the application of water quality improvement, bottom modifier, attention to oxygen and so on. 6. For shrimp poisoning swim pond phenomenon, we must carefully analyze the causes of poisoning, take the change of water, spill antidote drugs, oral administration of vitamin C, liver protection treasure and other measures. 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