1.1. Test sites and environmental conditions The two test pools are located in the Aquaculture Center of Quwan Village, Xitang Town, Yinhai District, Beihai City. The newly converted cement hard pots may have tidal offset water. A pool area of ​​1.9 acres, B pool area of ​​4 acres, the pool depth is 175cm. 10cm sand is laid at the bottom of the pool. There is no obvious pollution near the sea water, water quality is stable, pH 8.2, specific gravity 1.013-I.018, water temperature 25-35 °C.
1.2 The cultured species is Penaeus monodon, and the specs are 1.0-1.2 cm.
1.3 The feeds used were the No. 0, No. 1, No. 2 and No. 3 materials of the “Guangdong†brand zebrafish.
1.4 750w submersible pump self-flow jet oxygenator oxygenation.
2 Breeding management methods
2.1 Pre-injection 10cm into the water 10 days before the seedlings, bleaching and soaking the whole cell with 6.3kg/mu of bleaching powder for one day, then install 60 mesh nets at the inlet and outlet gates, fill the water to 90cm, fill the mud and close the inlet gate. Then tea seed cake, auxin, urea, phosphate and other fertilizers and water, cultured water, transparency up to about 60cm Fangmiao.
2.2 Putting seedlings in pots with potted water to test the larvae for one day. No deaths were found. On the morning of June 14th, shrimps were placed, with 19,000 in pond A and 64,000 in pond B. At the same time, 60 mesh bags were placed in the pool for testing the survival rate on the 3rd day.
2.3 Bait Feeding According to the different growth stages of the shrimp, the feed specifications and the number of baits are determined. The amount of bait is flexibly adjusted according to the shrimp feeding conditions, water quality changes, and weather conditions. The water color culture in this experiment was better and stable, and the feeding was started on the 12th day after the seedlings were released. Twenty-nine days ago, two shots were made at 6 o'clock and 18 o'clock respectively, and the amount of feeding was 50% of the daily amount. 29-75 days a day, 6 points, 18 hours and 23 hours 3 feeding, respectively, feeding the amount of daily investment 30%, 40%, 30%. After seventy-five days, the animals were baited four times a day at 6 o'clock, 11 o'clock 30 o'clock, 18 o'clock and 23 o'clock, and the feeding amount was 30%, 20%, 30%, and 20% of the daily dose respectively.
2.4 The water quality management gradually increases the water level on the 5th day after the seedlings are released. The water is pumped 5-10cm daily and the water is stored to 120cm. Later, according to changes in water quality, appropriate pumping and water changes, application of chemical fertilizers, lime, zeolite powder and so on. After 60 days, an oxygenator was placed in pool A and two were placed in pool B.
2.5 Disease prevention and control Every 15 days or after a large amount of pumping, after the heavy rain, use the "bacterial water net" type A product Quanchiposa. In the later period of culture, drugs such as "Exterminator" No. 2 and copper complexes were administered according to ciliate disease, noctiluca disease, and jaundice disease. Add "bacteria-water net" series of products and vitamin C and other disease-preventing and nutrient preparations to the feed to promote the growth of shrimp and improve immunity. No viral disease occurred throughout the culture process.
2.6 Day-to-day management Many ponds are observed every day to observe the feeding and activities of shrimps. Water temperature, pH, specific gravity, and transparency are recorded at regular intervals. Pumped water and oxygenation systems are inspected. The growth of shrimps is regularly monitored. Problems are identified and measures are taken in time. In particular, the water quality in the later period is poor. At the same time, attention should be paid to feeding, pumping water, and oxygenation.
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