Since the outbreak of large-scale shrimp disease in the 1990s, Japanese shrimp has become an important cultured species in the north and south because of its rapid growth, delicious meat quality, strong disease resistance, and high transportation survival rate. However, in the seedling cultivation, due to various reasons, the development of the larvae and the larvae of the larvae often appear, and then a large number of deaths lead to the failure of the nursery. The zoea stage is particularly prominent. In response to this problem, the author combined many years of experience in shrimp nursery, from 2003 to 2005 in Weifang City, Shandong Province, the second aquaculture testing ground, from the perspective of water treatment and control, in line with improving water quality, optimizing the larval development environment, strengthen the larval physique , to promote the abnormal direction to conduct in-depth discussion and achieved good results.
I. Test of shrimp rearing in Japan
1. Nursery conditions 500 cubic meters of water sports nursery room, 20 nursery ponds, pool depth of 1.3m, equipped with the corresponding water (sea, light), electricity, gas, heating supply facilities and storage tanks, when the tide of water used for raising seedlings is traced back to the whitecaps River water and underground fresh water extracted.
2. The nauplii source nursery nauplii was purchased from Qingdao, Rizhao and Weifang. Between 2003 and 2005, 36 million, 36 million and 47 million tailless nauplii were purchased respectively.
3. Apply 20 to 30 days before applying fertilization and fertilizer to water, and add seawater to the reservoir during the tide, and depending on the number of single-cell algae in the water, apply fertilizer and water. Fertilizers generally use diammonium phosphate or urea. The first fertilization is 1.5ppm, and 1ppm is applied every other week. With the propagation of algae, the color of the water gradually increases. When the transparency reaches about 50cm, the fertilization is stopped. When water is used to raise the seedlings, fertilization is also stopped (because the algae grow more slowly, the water color is lighter and the transparency is larger, and a small amount of fertilizer can be applied, but generally it does not exceed 0.5 ppm).
4. Drug disinfection About 10 hours before entering the seedlings, the seawater is filtered through a 300-mesh bag and pumped into a scrubbed and disinfected nursery pond. The water level is controlled to 1.1m, traces of gassing, and water temperature, salinity, and anthropogenic organisms are adjusted. The incubating environment is basically the same and applies EDTA ~ 2Na5ppm ~ 10ppm. Several hours before seedling, apply 1ppm of sodium dichloroisocyanurate (containing 20% ​​of available chlorine) in the tank for disinfection. After 1 hour, apply 1ppm of sodium thiosulfate to neutralize excess chloride ions, and then do not mix any more. Sterilized seawater. After the nauplii arrives, it can be directly put into the pool. If the temperature difference is too large, the transitional treatment will be carried out.
5. Change the water to adjust the larvae into the larval stage of the larvae and begin to add (change) water, the first increase of 5cm, then increase by 5cm every day. Into the larvae period, depending on the water quality increase the amount of water, control the daily change of more than 30%. The newly added seawater was preheated seawater, treated with 1 ppm of sodium dichloroisocyanurate for 1 hour, and then neutralized with sodium thiosulfate.
6. Inflatable control The aerodynamic volume of the juvenile larvae ranges from 0.8% to 1%, the larvae of the clams range from 1% to 1.2%, and the aeration of the larvae enters the period above 1.5%. During daily operation, try to maintain the stability of the air-inflating capacity. When you need to increase the amount of air-inflating, gradually transition. Do not stir the bottom of the pool to contaminate the water.
7. Feed Feed Feeds include compound feed, rotifers, Artemia nauplii, and adult Artemia. In Z1 phase, all feeds with smaller granular feeds were used. In the Z2 phase, live rotifers that had been sterilized were added. In the Z3 phase, freshly hatched Artemia nauplii were mainly used. Add appropriate amount of compound feed to enter the larval shrimp period. Crushed or live brine shrimp. Strictly control the amount of feeding, not too much, microscopic observation to full stomach is appropriate.
8. The water quality control often determines the physical and chemical indicators such as pH, dissolved oxygen, keeping the temperature fluctuation of the pool water below 0.5°C during the seedling raising, controlling the pH between 7.8 and 8.6, and the dissolved oxygen above 5mg/L. The salinity remains basically stable before and after changing the water. .
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