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1. Pond Condition The pond is a high-level pond and needs to be pumped into the pond for a total of 2 ponds, each with an area of ​​4 acres. It has a sluice gate, and the bottom of the pond is flat. It is inclined toward the outlet, and can drain the pool water. The average pond depth is 1.5. m, the water source is low salinity seawater in Hangzhou Bay with a salinity of 6.2.
2. Shrimp pond preparation On September 4th, after shrimp was caught, the mu was disinfected with bleaching powder of 5 kg in the evening. After the disappearance of the medicinal property on September 8, the water began to fill 0.6 meters deep, and then 0.2 g/m3 dibromohydantoin was used to disinfect the water body. The next day, the water quality was cultivated with urea 2.5 kg/mu and phosphate fertilizer 0.5 kg/mu.
3. After one week of holding the pond fertilizer in water, the egg-bearing shrimps purchased 13 kilograms of broodstock on September 18 after the fattening of the water, which was put into two ponds on average.
Second, daily management
1. Water quality management 1 The key to hatching and cultivating shrimps is to adjust the water color, which is mainly to control the breeding trend of plankton populations. It is appropriate to use light yellowish green or light yellowish brown because it means that the water is dominated by benthic diatoms. This is the food that shrimps prefer to eat. The general transparency is controlled at about 30 cm, and the fertilization concentration is controlled by putting 1 gram of nitrogen and 0.1 gram of phosphorus per cubic meter of water. After dissolving, cast and splash. Afterwards, top-dressing will be performed according to the water color at any time. When the body length of the shrimp reaches 1.5 cm, the water is continuously added to gradually deepen the body. 2 develop water quality regulation. Every time when the tide is high, the water enters and drains once. When draining, the bottom sluice is pumped out to allow the sewage to flow out from the bottom, discharge 30 to 40 centimeters, and then inject new water to promote the prawns.
2. Feeding the shrimp seedlings with fertilizers to feed the natural foods to solve the feed, when the average body length reaches 1.5 cm, only by fertilizing bait, can not meet the needs of the white shrimp feeding, so you must manually feed the bait. According to the local conditions, generally feed 0# and 1# materials of Penaeus vannamei, and the initial feeding is to splash the entire pond. Afterwards, it should be uniformly fed on the beach along the pond, once every day and every afternoon, with the following period. The reduction of water temperature, to reduce the amount of feeding or basically do not vote, generally in the water temperature above 5 °C, when the weather is fine, feed at noon once. The entire cultivation period was shared to 1.15 tons of feed.
3. Day-to-day management Inspect the patrol ponds daily to observe shrimp feeding, growth, color, gates, gate nets, etc., and take appropriate measures in time to ensure the safety of shrimp ponds and the healthy growth of white shrimp.
Third, the breeding results
On January 21, 2005, a total of 1,568 kilograms of white shrimp were caught, including 881 kilograms of 1# pond, 220.25 kilograms of per mu, 687 kilograms of 2# pond, and 171.75 kilograms per mu. The average price of ridge-tailed white shrimp is 38.2 yuan/kg, total output value is 59,900 yuan, and the production cost is 0.93 million yuan (including species of shrimp, drugs, electricity, feed, and labor). The total profit is 50,600 yuan, and the benefit is 6,325 yuan. Yuan, the average bait coefficient is 1.47.
Fourth, attention and summary
1. Transport of broodstock and broodstock is a crucial step. Since the squid caught in the sea must be transported to the shrimp pond for a certain distance, they must be separated and caught every second. They should be transported immediately, and the transport operations should be carried out gently to avoid shrimp eggs. Shedding; Secondly, it must be transported by oxygenation, otherwise the shrimp eggs will cause embryonic death due to lack of oxygen, affecting hatching rate of shrimp eggs.
2. The cultivation of basic bait is the key to the survival of shrimp seedlings. Without proper plankton as an open bait, the growth and development of shrimp seedlings will be delayed and the size will be different, resulting in a low survival rate.
3. In the autumn and winter, white shrimps are reused not only in the ponds, but also in the cost of the rented ponds. In addition, the whole growing season is in autumn and winter, the water temperature is relatively low, and the number of aerators is less, which saves electricity costs. Secondly, white shrimp can be fully used. The use of powdered feeds resulted in a relatively high feed utilization rate and low feed costs, resulting in lower production costs and higher benefits.
White shrimp breeding in winter
First, materials and methods
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