1. Change the amount of water
From mid-June to mid-July, mainly water is added, and the daily water exchange volume does not exceed 15%. By mid-July, the pool water will be deepened to a maximum depth of 1.5 meters. After mid-July, change the water every 2 to 3 days, change the water level by about 10% each time, and maintain a relatively stable color and transparency. After mid-August, large tides were exchanged with large tides to keep the water fresh and the transparency was about 50 cm. In short, the principle of changing the water: good water for more, not good water for less, bad water does not change; pre-added water, medium-term small water change, late large water change.
2. Determination of water quality indicators
When swimming crabs live in poor water quality, it is difficult to achieve a predetermined growth effect. To do this, water quality measurement and control must be made.
Determination of water temperature: every day from 5 am to 6 am, and from 2 pm to 3 pm, the water temperature is measured once. The temperature directly affects the speed of metabolism of the body of the crab. The optimum water temperature is 25°C～28°C.
Determination of transparency: Tested once every afternoon from 2 to 3 pm. According to the different growth phases of the crabs, different degrees of transparency are created for them. The transparency of the early phase is controlled at about 30 centimeters, about 35 centimeters at the middle stage, and 40 centimeters or more at the latter stage. A suitable degree of transparency not only provides a dark environment for the crabs, but also reduces self-mutilation. A large amount of phytoplankton and swarf provide abundant bait for the proliferating shellfish, and a large amount of shellfish is the favorite food for the crabs.
Determination of ph value: every day from 5 am to 6 am and from 2 pm to 3 pm. The value of seawater is generally around ph8.1, and the suitable value of the crab is ph7.8-9.0.
Salinity determination: The salinity is measured once before and after the water change. The optimum salinity is 25 ‰ to 30 ‰.
Dissolved Oxygen Determination: Daily from 4am to 6pm and from 4pm to 6pm, each requires a dissolved oxygen level of more than 5 mg/l.
Ammonia nitrogen and other nutrients: conditions can be tested in 1 day, unconditionally measured on a week. When the ammonia nitrogen content is high, it becomes a poisonous factor of the crab, and the aquaculture period should be controlled below 0.5 mg/L. Hydrogen sulphide and nitrite determination: One week. The concentration of hydrogen sulfide must not exceed 0.01 mg/l, and the concentration of nitrite must not exceed 0.5 mg/l.
Second, feeding
Swallow crabs have higher requirements for feed protein. The determination of the amount of feed should be based on a comprehensive analysis of the factors such as stocking density, growth period, individual size, and food quality of water temperature and water quality. The bait must be put on the bait station or fed along the pool. Do not put it in the ditch and deep water area to avoid the waste of the bait remaining to pollute the bottom of the pool. After juvenile crab enters the breeding area, it begins to feed a large amount of shellfish because there is not enough feed on the shellfish. Generally, it is only supplemented at night by feeding a small amount of artificial compound feed. At this time, it is necessary to observe the feeding condition of the shuttle crab on the compound feed and appropriately adjust the feeding amount. After 10 days, we began to increase the fed amount of artificial compound feed and cheap shellfish, and implemented a small number of multiple feeding methods, such as feeding back at 5 o'clock in the morning and feeding at 18 o'clock, 21 o'clock, and 24 o'clock in the evening. Comprehensive summary of various influencing factors for the following feeding methods: less investment in early period, less investment in high temperature period, less investment in cloudy and rainy days, less investment in shelling, less investment in poor water quality, more than one crab in multiple places, more investment in good water quality, When the temperature is appropriate, it is more likely to vote. After the shell is released, it is more likely to be cast. After mid-August, it is more likely to vote afterwards.
Third, daily management
1. Observe the activity of the crab
Swimmer crabs are rarely active during the day and most of them are lurking in the bottom of the pool. They frequently come out at night and feed for food along the poolside. Therefore, it is necessary to pay close attention to the activities of the crab during the days of overcast and rainy days, foggy days, high-temperature hot weather, low-pressure typhoon weather, and nighttime, which are prone to lack of oxygen. Once the shuttle crabs are found to be anoxic, change the water immediately and sprinkling oxygen-enhanced powder. Aerators must be turned on in time. If a large number of swimming pools are found during the day, analysis should be made from two situations. One may be insufficient feeding of bait, and the other is likely to have problems with water quality and sediment quality.
2. Patrol Pool and Pond Diary Archives
The early morning and evening patrol pool is a basic job for breeders to listen to the local weather forecast in time. Always check the feeding condition of the crab and pay attention to escape prevention and theft prevention.
Every 10 days to 15 days, the growth of the crab was measured, including the length/width of the carapace, the body weight, recording, analyzing the growth, adjusting the feeding amount and adjusting the bait mix.
IV. Disease Prevention
In the breeding process, crab farmers often abandon or neglect the ecological environment protection of the pond for pond cultivation due to the pursuit of economic efficiency, and the density of seedlings is too large to keep up with the nutrition; or the overfeeding of fresh live bait exceeds the load capacity of crab ponds. Some even feed on deteriorating feeds, causing porthinopathies and even disease pandemics. Scientific aquaculture focuses on prevention and focuses on protecting the aquatic environment. Use healthy crabs, regularly disinfect the body of water, and scientifically feed baits (especially in the hot season).
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