1. Water quality management. Crayfish have relatively high requirements for water quality. There should be no stinky water or highly attenuated water, so new water needs to be injected every day to achieve the dissolved oxygen level in the shrimp field.
2. Feeding and management. The period for combined rice and shrimp breeding is generally only 2-3 months. Since rice will be sown in the south in early June, large-area breeding requires finished shrimps to be fed in a short period of time. Be careful.
Take Huarong as an example. The special lobster feed used to feed crayfish in Huarong is added with soybeans. The ratio is 7:3, 3 points of feed and 7 points of soybeans. Each mu of land is about Around 5 pounds.
When the weather temperature is high, you can put more in, and when the temperature is low, you can put less in, because uneaten feed and soybeans can easily damage the water quality.
3. Disinfection management. Shrimp fields transformed from rice fields are prone to produce other plants. The appropriate amount is beneficial to the growth of crayfish. Too much will affect the water quality, causing crayfish to be hypoxic, and when the temperature is too high, In this case, it is easy for a green plant to breed.
This kind of plant needs to be cleaned up in time. There are special medicines on the market to clean up this kind of plants. It is recommended to use it sparingly and in multiple times, because too much medicine can easily cause crayfish lesions. The best way to clean it is to The method is manual cleaning.
4. Fishing management. Shrimp pots are generally used during fishing. Shrimp pots with larger density space need to be placed. This will effectively filter out crayfish that do not meet the sales requirements, and the shrimp The cage must be enlarged. Generally, it will take 15 hours after the shrimp cage is put in to collect the shrimp. If the shrimp cage is small, it will easily cause the death of the crayfish.
Extended information
Shrimps are expert swimmers and can use their legs to swim long distances. When it swims, its swimming feet stroke backwards and forwards like wooden oars, and its body slowly drives forward.
When frightened, its abdomen flexes and extends quickly, its tail moves downward and forward, and it can continuously jump backwards at a very fast speed. Some shrimps are not good at swimming, and large lobsters spend most of their time crawling on the sand and rocks on the seabed.
Respiration and circulation The gills of the shrimp are located in the gill chamber formed on both sides of the carapace. The front, rear and ventral surfaces of the gill chamber are connected to the outside world. The gills are mostly feather-shaped, with 25 pairs in total. They are located on the side walls of the chest or the base of the thoracic limbs. The epidermis is extremely thin, and gas exchange occurs when blood flows through the gills.
There is a scaphoid in the gill chamber that continuously swings, allowing fresh water to enter from the back and ventral surface and flow out forward.
The circulation system is open-tube. The heart is a flat polygonal muscular sac located in the pericardial sinus on the dorsal side of the cephalothorax. It has 4 pairs of cardiac pores, two pairs on the back, one pair on both sides of the rear end, and the other pair on the ventral surface of the heart near the rear end. There are valves that control the flow of blood.
Baidu Encyclopedia - Shrimp