CATDOLL : CATDOLL: Shrimp farming techniques and methods, the difference between shrimp and green shrimp

1. Pond requirements: Taking the cultivation of white shrimp as an example, the depth of the pond is generally about 1.8m. The pond needs to have a complete water supply and drainage system, and there is sufficient water supply around it. In addition, the nutrients in the aquaculture water must be able to meet the nutritional needs of white shrimp. 2. Greenhouse structure: The greenhouse structure is generally based on the "human" shape, which can reduce the difficulty of construction and save construction materials. 3. Sterilization: Before stocking the shrimp fry, it is necessary to sterilize it. Generally, quicklime can be added to the pond for disinfection 25 days before the formal stocking of the shrimp fry.

1. Shrimp farming technology

1. Pond requirements

(1) Taking the cultivation of white shrimp as an example, the depth of the pond must be around 1.8m.

(2) The pond must be equipped with a complete water supply and drainage system, and there must be sufficient water resources around it. In addition, the nutrients in the aquaculture water must meet the nutritional needs of the white shrimp.

(3) A fixed-power oxygen-enhancing device should be installed in the pond to ensure that oxygen is supplied to the pond within the specified time to ensure that there is sufficient dissolved oxygen in the pond.

2. Greenhouse frame

(1) The greenhouse structure is mainly in the shape of a human figure, which can reduce the difficulty of construction and save construction materials.

(2) The greenhouse can be built using a bamboo-wood frame structure, which is convenient for disassembly and dust removal, and the bamboo-wood frame can also be recycled.

(3) The thickness of the covering film should be 0.6-0.8mm, and it should have good light transmittance. The color of the film should be white as much as possible.

3. Sterilization

(1) Before releasing shrimp fry, sterilization must be carried out. Quicklime can be added to the pond for disinfection about 25 days before the official release of shrimp fry.

(2) After disinfection with quicklime, be sure to add bleaching powder of appropriate concentration to the pond one week in advance. You can also add an appropriate amount of fertilizer, such as chicken manure.

4. Shrimp seed management

(1) Select shrimp fry

① When breeding whiteleg shrimp in greenhouses, the water in the pond is generally fresh water, so it is important to choose desalinated shrimp varieties.

② In addition, it is necessary to select shrimp species that can adapt to the greenhouse pond environment according to the breeding conditions of the greenhouse pond, and try to choose shrimp seedlings with higher sales in the market.

(2) Conduct non-toxic testing

After selecting the shrimp fry, it is necessary to conduct non-toxic testing. This can ensure that all indicators of the shrimp fry meet the specified requirements and avoid the transmission of viruses between shrimp fry.

(3) Letting things run wild

① Before stocking, be sure to place the bag of shrimp fry in the pond for about 15 minutes, so that the shrimp fry in the bag can adapt to the water temperature and basic environment of the pond.

② After they have adapted, remove the bags and release them into the pond in batches. This can reduce the stress response of the shrimp fry and avoid large-scale deaths of shrimp due to their inability to adapt to the environment.

③The number of shrimp fry released must match the size of the pond. Generally, fixed grids can be placed in the pond, and then a fixed number of shrimp fry can be released in each grid to prevent the shrimp fry from swimming around.

5. Feeding and management

(1) Feed the shrimp appropriately according to their growth conditions to ensure that the amount of feed can meet their growth needs. Do not feed too much, otherwise there will be waste. Do not feed too little, which will also affect their growth.

(2) The feeding time must meet the shrimp’s eating habits to avoid feed waste and reduce the impact of excessive feed on pond water quality.

6. Regulate water quality

(1) Water quality must be adjusted in a timely manner according to changes in water quality. Water quality changes in the pond can be monitored at a fixed frequency to keep abreast of changes in water quality in a timely manner. Then, the pond water quality can be effectively adjusted by reducing the amount of bait added.

(2) The water temperature can be adjusted in time according to the season. When the water temperature changes, appropriate measures must be taken to stabilize the water temperature to prevent the water temperature from fluctuating and affecting the growth of shrimp.

7. Adjust the dissolved oxygen content in water

(1) The dissolved oxygen content can be adjusted to an appropriate level in a timely manner according to the specific dissolved oxygen content in the water.

(2) Generally, oxygen can be injected into the pond water through the oxygen pump in the pool, and the dissolved oxygen content in the water can be detected through the dissolved oxygen content detection device to see if it meets the standard. When the dissolved oxygen content reaches the standard, the oxygen supply can be stopped.

(3) Note that the dissolved oxygen content in water will be different in different seasons, so the dissolved oxygen content must be adjusted flexibly.

8. Disease prevention and control

(1) Generally, after a period of breeding in greenhouse ponds, a large amount of silt and bacteria will accumulate in the pond. If the silt and bacteria are not cleaned in time, not only will the pond water quality deteriorate, but also diseases will break out. Therefore, it is necessary to clean the pond in time to improve the water quality and reduce the probability of disease.

(2) Grid breeding can be used to effectively isolate the virus, prevent transmission between shrimps, and reduce the area of ​​disease occurrence.

(3) The type of disease that the shrimp fry are infected with can be determined based on their growth conditions, and appropriate remedies can be prescribed to improve the quality of shrimp fry disease prevention and control.

2. The difference between prawns and shrimps

1. The body color of the green shrimp is blue-green with brown-green stripes. The boundary between the cephalothorax and abdomen is very obvious. The cephalothorax is relatively thick and gradually becomes smaller from the abdomen. The body consists of 20 segments. The body color of the female Chinese shrimp is generally gray-green, and the body color of the male shrimp is yellow. It consists of 21 segments in total. Except for the first and last segments, each segment has a pair of appendages.

2. When breeding white shrimp, if it is cultured in fresh water, the pH value of fresh water must be between 6.5-8.5. If it is cultivated in seawater, the pH value of seawater must be between 7-8.5. When releasing fry, the water temperature cannot be lower than 20°C, but cannot exceed 33°C. When the water temperature is lower than 20°C, it can be heated by building a winter shed, laying white sand, deepening the water level, etc. When the water temperature exceeds 33°C, it can be cooled by deepening the water level, turning on more aerators, etc.

3. In the process of shrimp farming, water must be changed regularly to ensure clean water quality. When the dissolved oxygen in the water is insufficient, the oxygenation equipment should be turned on in time to ensure that the shrimp has enough oxygen for growth. It is also necessary to control the transparency and pH of the water body, reduce the change of pH value, and avoid excessive changes in pH value that affect the growth of shrimp.