In summer, the weather is hot and the water temperature is high. In order to ensure the safety of the crabs crossing the summer, the survival rate is improved. According to the meteorological department's recent forecast of the weather conditions and the actual aquaculture production, the farmer should be reminded that it should do the following management and precautions.
First, deepen the water level
When the temperature reaches 35°C or so, it indicates that the hot season has arrived. At this time, pool water should be added to the deepest of the year. During the hot season, the appropriate maximum water level can be maintained between 1.2m and 1.5m (polyculture of shellfish ponds, shellfish surface water depth should not exceed 0.8 meters).
Second, adjust the water quality
1 is to control the color of water. Over-concentration and clearance must be adjusted to control the transparency of 30? 50 cm, the water color is yellow-green or tea-brown; 2 is to enter the drainage should be cautious, on the one hand according to their own needs increase or decrease the amount of water, on the other hand, we must pay attention to the water quality The impact of changes, such as signs of blue-green algae or early signs of red tide after heavy rain or water sources are not suitable for large-scale water changes; 3 is to strengthen the disinfection and improvement of water quality, you can first use lime and other efficient disinfectants for water disinfection, and then use microbial agents to improve. 4 is to ensure adequate dissolved oxygen. Adequate dissolved oxygen is the key to successful breeding, especially in the ponds that are currently mixed with white shrimp. The water in the middle and late stages of the pond is relatively concentrated, and it is prone to cause hypoxia at night. Therefore, sufficient aerators must be provided.
Third, reasonable feeding
During the hot season, except for the high water temperature at noon, the blue crabs in both the water and the aquatic plants hide the water, and when the weather is cool in the morning and in the evening, they usually come out for activities, foraging, and have a large food intake. At this time, as much as possible to ensure the supply of food, promote the growth of crabs. The following requirements shall be fulfilled when feeding: (1) It is necessary to ensure the quality of feed and prohibit the use of spoilage; (2) It is necessary to increase the amount of feed in time as the cultured species grows; Feeding, do not over-feed in order to speed up the growth rate of blue crab, so easy to cause changes in the water quality of the pond, resulting in the incidence of cultured species, the bait feed should be done in principle rather rather than abuse. No matter what kind of feed, it should adhere to the principle of freshness, deliciousness, and quantity. It is better to observe a slight surplus within 2 hours to 4 hours. The specific standard should be about 8% of the body weight of the crab. Ultimately, it should be adjusted flexibly according to weather, water quality, crab pond conditions, etc. Feeding time is good for morning and evening, and the feeding place can be in the water grass and the place where the water temperature is lower.
Fifth, pay attention to disease prevention
In the hot season, pathogens, viruses, and other hazards will be less, and will benefit the growth of aquatic products. Farmers need careful management, but environmental diseases are prone to occur, such as lack of oxygen, nitrite poisoning, etc., farmers should pay more attention.
First, we must do a good job in the disinfection of bait, water bodies and sediments, and sterilize once every 15 days with iodine preparations and other drugs;
Two regular time in the feed mix in vitamin C and oxytetracycline, allicin and some other disease-preventing drugs, increase the avian's own immunity, to 3 to 5 days for a cycle. In addition to the period of administration, biological agents are mixed in the feed for feeding.
3. Pay attention to keeping the water in the pool stable, and use quicklime or lime after typhoon or heavy rain. When the water is too thick, change the water or increase the start time of the aerator.
In the four ponds, sediment modifiers such as microbial preparations and zeolite powder were used. Found dead crabs should be immediately removed, and find out the reasons to take measures to prevent the spread of crab disease. Crab ponds during high temperatures must insist on daily patrols. Through the patrol pond, you can learn about the feeding behavior of blue crabs, check the status of the prevention and escape facilities, and whether there are any diseases or predators. If there are traces of blue crabs escaping, replace the damaged anti-escape facilities in time. Timely capture the water mouse and other predator creatures in the crab pond to eliminate its damage to the crab. Artificially cultivated green crabs have many diseases and they must do a good job of preventing diseases. The occurrence of diseased crabs and dead crabs should immediately find out the reasons and pay close attention to treatment.
First, deepen the water level
When the temperature reaches 35°C or so, it indicates that the hot season has arrived. At this time, pool water should be added to the deepest of the year. During the hot season, the appropriate maximum water level can be maintained between 1.2m and 1.5m (polyculture of shellfish ponds, shellfish surface water depth should not exceed 0.8 meters).
Second, adjust the water quality
1 is to control the color of water. Over-concentration and clearance must be adjusted to control the transparency of 30? 50 cm, the water color is yellow-green or tea-brown; 2 is to enter the drainage should be cautious, on the one hand according to their own needs increase or decrease the amount of water, on the other hand, we must pay attention to the water quality The impact of changes, such as signs of blue-green algae or early signs of red tide after heavy rain or water sources are not suitable for large-scale water changes; 3 is to strengthen the disinfection and improvement of water quality, you can first use lime and other efficient disinfectants for water disinfection, and then use microbial agents to improve. 4 is to ensure adequate dissolved oxygen. Adequate dissolved oxygen is the key to successful breeding, especially in the ponds that are currently mixed with white shrimp. The water in the middle and late stages of the pond is relatively concentrated, and it is prone to cause hypoxia at night. Therefore, sufficient aerators must be provided.
Third, reasonable feeding
During the hot season, except for the high water temperature at noon, the blue crabs in both the water and the aquatic plants hide the water, and when the weather is cool in the morning and in the evening, they usually come out for activities, foraging, and have a large food intake. At this time, as much as possible to ensure the supply of food, promote the growth of crabs. The following requirements shall be fulfilled when feeding: (1) It is necessary to ensure the quality of feed and prohibit the use of spoilage; (2) It is necessary to increase the amount of feed in time as the cultured species grows; Feeding, do not over-feed in order to speed up the growth rate of blue crab, so easy to cause changes in the water quality of the pond, resulting in the incidence of cultured species, the bait feed should be done in principle rather rather than abuse. No matter what kind of feed, it should adhere to the principle of freshness, deliciousness, and quantity. It is better to observe a slight surplus within 2 hours to 4 hours. The specific standard should be about 8% of the body weight of the crab. Ultimately, it should be adjusted flexibly according to weather, water quality, crab pond conditions, etc. Feeding time is good for morning and evening, and the feeding place can be in the water grass and the place where the water temperature is lower.
Fifth, pay attention to disease prevention
In the hot season, pathogens, viruses, and other hazards will be less, and will benefit the growth of aquatic products. Farmers need careful management, but environmental diseases are prone to occur, such as lack of oxygen, nitrite poisoning, etc., farmers should pay more attention.
First, we must do a good job in the disinfection of bait, water bodies and sediments, and sterilize once every 15 days with iodine preparations and other drugs;
Two regular time in the feed mix in vitamin C and oxytetracycline, allicin and some other disease-preventing drugs, increase the avian's own immunity, to 3 to 5 days for a cycle. In addition to the period of administration, biological agents are mixed in the feed for feeding.
3. Pay attention to keeping the water in the pool stable, and use quicklime or lime after typhoon or heavy rain. When the water is too thick, change the water or increase the start time of the aerator.
In the four ponds, sediment modifiers such as microbial preparations and zeolite powder were used. Found dead crabs should be immediately removed, and find out the reasons to take measures to prevent the spread of crab disease. Crab ponds during high temperatures must insist on daily patrols. Through the patrol pond, you can learn about the feeding behavior of blue crabs, check the status of the prevention and escape facilities, and whether there are any diseases or predators. If there are traces of blue crabs escaping, replace the damaged anti-escape facilities in time. Timely capture the water mouse and other predator creatures in the crab pond to eliminate its damage to the crab. Artificially cultivated green crabs have many diseases and they must do a good job of preventing diseases. The occurrence of diseased crabs and dead crabs should immediately find out the reasons and pay close attention to treatment.
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