Crab ponds should be built with crab ponds of 15 to 25 acres, and Tongzhongtang is to be built. The entrance and drain gates of Datang are built. The whole pond has a ring pool, 3 meters wide and 2 meters deep. The muddy pier has a non-shaped ditch connected with the ring-shaped pond ditch. There are two small ponds in the near entrance of Datanghe: 1 mu and 2 mu (1 mu pond is used to cultivate crab seedlings and seedlings are thick, 2 mu ponds are used for semi-paste crab and cream crab cultivation. Cultivate) Each of the two small ponds will have a water intake and an anti-escape facility. After clearing the pond and destroying the crab pond, the clear pond will be drained of the “non-†character ditch, and the bottom of the pond will be leveled and the bottom of the “non-†character will be ditched. Each kilogram of quicklime uses 50kg of quicklime to splash in the pond. When entering the water, it is filtered by three layers of 40, 60, and 80 mesh gauze, and water is taken in one time. After 7 days, the body of water is disinfected with “three acres of spirit†or “dibromohydantoinâ€. After another three days, the bio-agents such as “Lee Lido†were used to gradually divert water, and the salinity in the pond was stable at 4‰ to 8‰. Crab seedlings were cultivated and tested for water before putting on seedlings. Naturally caught crab seedlings were put into small ponds of 1 mu for temporary rearing, and they were raised for 24 hours. Crab seedlings were normally allowed to stand. Crabs should be disinfected before entering the pool. The method is to use 50 kg of water, 0.5 kg of sea salt, and 10 grams of potent iodine to form a liquid medicine. Put the crab seedlings into the medicine bath in batches for 3 to 5 seconds, and then put them into the culture tank. The disinfection of crabs is to prevent the crabs of fishing damage or broken limbs from being infected by bacteria or viruses, and to remove ciliates caused by the species of crabs and increase the survival rate. Crabs were incubated for 15 days after being fed. Most of the crabs were cultivated into crabs, which were put into ponds for crab breeding. The breeding density was 3000 birds per mu. Feeding and management 1. Feeding: The food intake of blue crabs increases or decreases with changes in water temperature, water quality, salinity, dissolved oxygen, pH, ammonia, and other environmental conditions. After the tide changes water, the environment is normal and the food intake is increased. Therefore, observations, checks, or adjustments to the amount of feeding should always be made. In the early stage of the crab, the small blue dragonfly (white pheasant) is cast, and the daily amount accounts for 30% of the body weight of the crab, and the small mixed fish and the artificial compound account for 10 to 12% of the body weight of the crab. The mid-term (medium crab) accounts for the amount of the blue pupa. 20% of body weight, small trash fish, and compound materials accounted for 8% to 10% of body weight. In the later period (large crabs), Japanese maggots accounted for 7% of body weight and small trash fish and compound materials accounted for 5% of body weight. The bait should be thrown at the Huantang Gou and the “Non†gully shoal, and should be put evenly to avoid fighting for food and cause disputes. 2, change the water: green crab hi in the fresh water, high oxygen content in the environment, the oxygen consumption in the clam shell is large, especially sensitive to the quality of water quality, if its own pond water is too "old water", "deadwater" "Contaminated water" cannot be shelled, the food intake is greatly reduced, the old one is raised, and the raising is old (becomes old crabs or stone crabs). There are two high tide periods every month. You must master the change of water, and you should pay attention to changing the water every time. The temperature difference or salinity of the old and new water should not be too large. Elimination of Harmful Factors Regularly Green crabs are kept throughout the year, large catches stay small, and large amounts of excreta are deposited at the bottom of ponds. They are highly polluted by ponds, and it is difficult to change the water in the dry season. The harmful substances in the pond exceed the standards and the water quality deteriorates. . Therefore, regularly spread high quality "bottom net" and other sediment modifiers and high concentration of water improver once every 20 days to maintain a good environment, so that the normal growth of blue crabs. The patrol pond often inspects the gates and the escape prevention facilities for damage, observing changes in water color, crab dynamics, growth of oyster shells, bait-feeding conditions, and predators or premonitions. Green crab disease prevention and control Green crab culture is susceptible to sudden changes in weather, water temperature, salinity, rain, and other physical factors and invasion of protozoa. The common diseases found in the production of the writer are: 1. Absinitis: The disease suddenly becomes higher or lower due to salt difference or temperature difference, salt difference, temperature difference is too large, so that the crab can not stand the sudden changes in the environment and infection, open the head The breastplate inspects the stomach wall, ovary, and testis for destruction and odor. The mortality rate of this disease is very high. Control methods: First of all, the water temperature can not be changed by more than 5 °C, salinity can not exceed 5 ‰; Second, the diseased crabs should be promptly removed, and then treated with drugs. Each kilogram of crab mixed with 5 grams of "Kangkangning" and 3 grams of garlic, made of bait, feeding for 3 to 5 days, in addition, 0.8 grams of "triteri", 0.3 grams of potassium permanganate per cubic meter of water body , 15 grams of sea salt, mixed with water and sprinkle the whole pond. 2. Hull disease: Due to shallow pond water level, long-term water temperature is high, especially in summer weather, it is easy to get the disease. There is a light yellow, light red, light white spot on the head chest shell, open the head breast check, head breastplate The endometrial wall is separated from the cephalothorax and the shells and membranes are eroded and eroded. The disease is also called the crustacean ulcer disease. The prevention and control method is mainly to constantly change the water temperature and lower the water temperature, and to cast more blue gills and other high calcium-containing shellfish feeds. Kilograms of artificial pellets were mixed with 5 grams of "Kangkangning" and 5 grams of fish were made of cod liver oil bait for 3 to 5 consecutive days. In addition, 0.3 grams of "Dactylone" and 15 grams of sea salt and water are splashed in every cubic meter of water. 3. Parasitic diseases: Aquaculture water bodies age, and pests such as ciliates reproduce in abundance, parasitize in the silk or abdomen of crabs, absorb nutrients from crabs and destroy capillarity capillaries, making it difficult for crabs to absorb oxygen in the water, resulting in tissue hypoxia. And continue to die. Control methods: When the water can not be changed during the dry season, apply "solid oxygen" (1 mu 1 to 2 bags) to improve the water quality, and at the same time, mix 5 grams of "chicocin" and 5 grams of "strong gram 101" per kilogram of crab material. Medicine bait feeding, continuous 2 to 3 days. Second, 1 gram of "shrimp fibrin net" per cubic meter of water was splashed. 4, muscle necrosis: usually feeding too much, crab excrement deposits, serious self-pollution, delayed clam shell cycle, resulting in shell muscles can not be old dead. Control methods: timely change of water, keep the water clear, live, cool, control the amount of feed and feed fresh feed, in addition, every cubic meter of water with 5 grams of tea seed cake soaked in water for 24 hours, spilled to stimulate the growth of oyster shell. 5. Slow claw disease: Due to the relatively poor environment of cultured water quality, the cycle of the clam shell is prolonged in each period, which is commonly known as keeping old and raising little. Diseased crabs have nervous convulsions. The hair should be slow and slow to crawl. Control methods: Change the water frequently, and feed fresh blue cockroaches. About 20 kg of lime are released per acre every 20 days, followed by 5 g of high-strength “B even water†per kg artificial granules, feeding for 2 to 3 days. 6, landing disease: due to malnutrition, pathogens, parasites attack, diseased crabs fled the original water, find a new environment, reduce food intake, and gradually die. Control method: 1 meter deep water per acre with "ashore stop A package" 1 packet of water after Quanchiposa, and then use the pool of water on the shore of the crab; per kilogram of feed with "ashore stop B package" 10 grams, continuous feeding 3 to 4 days, if the condition is serious, repeat a course of treatment. 7, shivering disease (shaking disease): caused by a virus infection. Poor nutritional quality is a precipitating factor. The diseased crab is unresponsive, slow-acting, the gripping force of the chewing claws is weakened, and the eating and eating are reduced and not eaten; the cocoons are arranged irregularly and are light brown, and a few are even black. Stepping and trembling, ring claws, claws to the ground, abdomen off the ground, and even the crab body upside down. In the later stages of the disease, it is often secondary to infection with Aeromonas hydrophila and Vibrio, causing the disease to worsen, hepatopancreas degeneration, necrosis, pale yellow, and finally pale, there is a large amount of ascites in the carapace, step muscle atrophy, Edema. Sometimes the neoplasia of the cephalothorax (carapace) is also necrotic and shedding, and finally the crab dies due to nervous disorders, dyspnea, and heart failure. A disease that is very serious for crab culture. Treatment method: If the diseased crab has parasites on its surface, it should kill the ectoparasite (fixed ciliate) first. Prevent infection while treating, and can not obtain a good therapeutic effect. Spill out "dibromohydantoin", "San Mu Ling" and other disinfecting drugs. A course of 2 to 4 days. When taking internal medicine, the main choice is to demonstrate that the medicine is effective: for example: "Crab Shaving Corning" (6 to 8 baits) and "Virus Scattered" (6 baits), usually for 6 days as a course of treatment. Treatment 1 to 2 courses. The basic disease control of diseased crabs, eating basically normal, you can continue to add "liver and kidney Corning" in the feed to promote rapid and complete recovery and growth of diseased crabs. 8, pests: in the tidal phase of changing the water, said bacteria, miscellaneous shrimp, seafood, yellow feet, etc., with the water into the crab pond, is the enemy of crabs, so regular 90 ~ 100 days to eliminate predators Once, with 10 kg of tea seedlings per acre, the water was immersed in water for 24 hours and then sprinkled with water. Harvesting coastal crabs has traditionally been followed by round-fishing. Due to the different sizes of crabs, there are large and small crabs. Large-sized crabs are fattened into crabs, especially male crabs, in about 20-30 days. In many cases, large catches should be caught in time. The female crabs that reach the crabs should also be caught and listed. During the entire breeding process, crabs can be caught on the market every day. Crab-cracking methods: 1. Cone-shaped cages are fixed at the central position of the ditch with bamboo sticks. 2, Snake Cage net loading and arresting: In the "non-" word ditch, ring Tanggou evening six fashion catch. 3, arrested: with a large aluminum net "four corners" arrested, put rotten flesh within the trapping effect. 4. Grab: In winter, put shallow water in the pond and fish with crabs. Due to the drought-resistance of the crab after it is separated from the water, under normal circumstances, the non-toxic sack cloth is used to soak the salt water, place it on the bottom of the basket, and then put the finished crab. The basket is stacked one by one, and the basket lid is locked with a net. Green crab can still be kept fresh within 48 hours.
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