In hot summer weather, the water temperature is relatively high. The crab culture must be strengthened in management and carefully reared to ensure that the river crabs can safely cross the river and increase the survival rate. Therefore, the following points must be made;
1. There is ample supply of leeches: In summer crab ponds, some aquatic plants such as peanuts and duckweed should be stocked, or some emergent plants such as reeds and alfalfa should be planted in advance. Where conditions permit, bricks, tiles and other stacked artificial crab nests can be used to provide a cool habitat for crabs. In addition, there must be a large number of young plants, such as Hydrilla verticillata and Arthrobacter spp., in order to feed the crabs and avoid predators. The plants used for shading should not cover the entire surface of the pool, leaving about 2/3 of the surface area of ​​the pool. The dirty grass should be promptly removed to avoid damaging the water quality and breeding germs.
2. Ensure clean water quality: The crab pool should constantly inspect the water quality, change new water frequently, remove remaining food and dirt in time, and keep the pool water clean. The depth of the water body must be maintained more than 1m to prevent hot water from burning and affecting growth. The water change is generally selected in the evening, and at least 1/3 of the original pool water should be left for each change of water. When the temperature is high, changing the water for 3-5 days is generally appropriate. The water source must be clean, non-toxic, and contain a certain amount of inorganic salts, such as calcium, potassium, sodium, phosphorus and other ions can be directly absorbed by river crabs to promote the growth of crabs and clam shells. Therefore, the water can be supplemented according to the situation. Inorganic salts in water. In the crab shell, especially to increase the content of calcium ions, generally every 667m2 water surface with quicklime 5-l0kg, Quanhua spilled after the water.
3. Pay attention to feed: The crab is an omnivorous animal and prefers animal feeds such as cockroaches, snails, and small fish. Crabs occupy a large proportion of plant foods in natural waters. During the high temperature stage, the proportion of plant food should be increased. Wheat, squash, and sesame cakes are vegetal feeds that crabs love to eat. When feeding, these feeds should be made into lumps and put on the table to feed the crabs. The amount of bait should be increased or decreased according to the water temperature of the day and the feeding condition of the crab after ingestion. Generally, it is appropriate to use about 10K of the total weight of the pool crab and two hours after feeding. Every day from 4 to 5 pm feeding, in order to adapt to the habit of crab night out.
4. Do a good job of preventing fleeing, preventing and preventing diseases: During hot periods, you must inspect the crab pond daily. Through the patrol pond, you can learn about the feeding activities of the crabs, check the escape prevention facilities, and check for disease and predators. If there are traces of river crabs running away, they must promptly plug the loopholes and replace the damaged escape prevention facilities and nets at the inlet and outlet. Heavy storm weather, but also pay attention to escape. We must pay attention to preventing the invasion of enemy enemies and timely kill and kill frogs, water rats, and other predators in the crab pond. Artificially cultivated crabs have more diseases than natural ones. We must do a good job of preventing diseases and we can occasionally use bleaching powders and other drugs. The occurrence of diseased crabs and dead crabs should immediately identify the cause of the disease, promptly treat the disease, eliminate pathogenic factors and ensure the safe growth of crabs.
1. There is ample supply of leeches: In summer crab ponds, some aquatic plants such as peanuts and duckweed should be stocked, or some emergent plants such as reeds and alfalfa should be planted in advance. Where conditions permit, bricks, tiles and other stacked artificial crab nests can be used to provide a cool habitat for crabs. In addition, there must be a large number of young plants, such as Hydrilla verticillata and Arthrobacter spp., in order to feed the crabs and avoid predators. The plants used for shading should not cover the entire surface of the pool, leaving about 2/3 of the surface area of ​​the pool. The dirty grass should be promptly removed to avoid damaging the water quality and breeding germs.
2. Ensure clean water quality: The crab pool should constantly inspect the water quality, change new water frequently, remove remaining food and dirt in time, and keep the pool water clean. The depth of the water body must be maintained more than 1m to prevent hot water from burning and affecting growth. The water change is generally selected in the evening, and at least 1/3 of the original pool water should be left for each change of water. When the temperature is high, changing the water for 3-5 days is generally appropriate. The water source must be clean, non-toxic, and contain a certain amount of inorganic salts, such as calcium, potassium, sodium, phosphorus and other ions can be directly absorbed by river crabs to promote the growth of crabs and clam shells. Therefore, the water can be supplemented according to the situation. Inorganic salts in water. In the crab shell, especially to increase the content of calcium ions, generally every 667m2 water surface with quicklime 5-l0kg, Quanhua spilled after the water.
3. Pay attention to feed: The crab is an omnivorous animal and prefers animal feeds such as cockroaches, snails, and small fish. Crabs occupy a large proportion of plant foods in natural waters. During the high temperature stage, the proportion of plant food should be increased. Wheat, squash, and sesame cakes are vegetal feeds that crabs love to eat. When feeding, these feeds should be made into lumps and put on the table to feed the crabs. The amount of bait should be increased or decreased according to the water temperature of the day and the feeding condition of the crab after ingestion. Generally, it is appropriate to use about 10K of the total weight of the pool crab and two hours after feeding. Every day from 4 to 5 pm feeding, in order to adapt to the habit of crab night out.
4. Do a good job of preventing fleeing, preventing and preventing diseases: During hot periods, you must inspect the crab pond daily. Through the patrol pond, you can learn about the feeding activities of the crabs, check the escape prevention facilities, and check for disease and predators. If there are traces of river crabs running away, they must promptly plug the loopholes and replace the damaged escape prevention facilities and nets at the inlet and outlet. Heavy storm weather, but also pay attention to escape. We must pay attention to preventing the invasion of enemy enemies and timely kill and kill frogs, water rats, and other predators in the crab pond. Artificially cultivated crabs have more diseases than natural ones. We must do a good job of preventing diseases and we can occasionally use bleaching powders and other drugs. The occurrence of diseased crabs and dead crabs should immediately identify the cause of the disease, promptly treat the disease, eliminate pathogenic factors and ensure the safe growth of crabs.