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Tail-tail white shrimp breeding technique in autumn
It is a kind of important economic shrimp that is unique to China. It has delicious meat and rich nutrition. It can be processed into dried products in addition to fresh food. In the autumn and winter of shrimp ponds, white-tailed shrimps are cultured, that is, after the second-long-tailed shrimps are harvested, white-seedlings are harvested from the seedlings or broodstock by self-cultivation and raised to live for sale before and after the Spring Festival. With the characteristics of low cost, short cycle, easy management, and high profitability, in recent years, this method has been commonly used in the county's postal stations and snake-distribution shrimp ponds, and good results have been achieved. The yield is as high as 30 kilograms, and the benefits are very high. 1500 yuan. White shrimp breeding in autumn and winter is conducive to improving the utilization of shrimp ponds, so that the winter shrimp ponds can fully play the benefits. It is worth promoting everywhere. First, the biological characteristics of white-tailed shrimp 1. habitat habits. The white-tailed white shrimp lives in the shallow sea near the shore and has strong adaptability to the environment. The suitable temperature range is 2°C to 39°C, and the water temperature can also survive at -3°C; the salinity range of 3.87‰ to 30‰ can adapt to the salty condition. The fastest growing in fresh water. Poor tolerance to hypoxia, less than 1mg/L, will die due to lack of oxygen. 2. Diet and growth. The tail-tailed white shrimp has a wide range of dietary habits and can feed on both animal and plant foods, but especially eats fresh fish, shrimp, and shellfish. The growth cycle is short, 2-3 months can grow into commercial shrimp. 3. Breeding habits. The white-tailed white prawn has a high fertility, and it is almost always held egg-bearing shrimp. Breeding period generally occurs in the spring, summer and autumn, about 10 times a year. Second, the ridge tail shrimp shrimp pond culture technology 1. Shrimp pond conditions. General shrimp ponds can be cultured, but especially in the bottom of the harbor, the sea water salinity is low, and shrimp ponds rich in natural white shrimp resources in the nearby sea area are the best. 2. Leave white shrimp seedlings. Different methods can be adopted according to different situations. (1) When the long-haired shrimp is harvested from the late July to the middle of August in the lunar calendar, white-shrimp seedlings should not be more than 2 cm in length. It is important to keep the white-shrimp seedlings in the pond. When shrimps are generally placed, the long-haired shrimps first exit, and finally a large number of white shrimps are hatched. This time, they must close the gates in time and repeatedly put the shrimps. The shrimps can be put to the end and the white shrimps can be kept. Shrimp seedlings; (2) Pay close attention to the occurrence of white shrimp seedlings in the sea area. When the last time the shrimp seedlings appear, take the method of draining the nets and draining the water into the dense nets to incorporate white shrimp seedlings. (3) Adopt the method of breeding white shrimp seedlings with fertilizer to increase the density of shrimp seedlings in ponds. After the last batch of white shrimps in the pond held the eggs in early August, they stopped entering and draining water, and increased the density of algae in the pond through fertilizing the baits, so that the white shrimps had sufficient feed after hatching, which greatly improved the survival rate of the shrimp seedlings. If there are not enough eggs in the pond, they can be caught from the sea. Generally 150-200 acres per mu. The combination of the above three methods can achieve better results. 3. Feed the bait. Adhere to feeding every day, shrimp can be used with food, fresh shrimp material, also available wheat bran, No. 4 powder, etc., depending on the density of shrimp in the pond, the size of the shrimp and eating conditions determine the amount of feeding. In the early period, it gradually increased in the middle period, and later, as the water temperature decreased, the amount of feeding was reduced or basically not cast. Generally, 0.5-1 kg of dry bait is fed per acre, and the water temperature in winter falls below 5° C. White shrimp are no longer eating, and feeding is stopped at this time. 4. Clear the enemy. Due to the unfinished ponds after the capture of the second pupae of long-haired shrimp, and naming seedlings are inevitably brought into the enemy's harmful organisms, it is necessary to use 15ppm tea cake cakes in the early stage of the cultivation to harm the animals. 5. Water quality management. Every time there is a large tide, the water will enter and drain once and change the water volume by 10-20% so as to promote the peeling of white shrimp. If the water quality in the pond is poor, the amount of water should be increased. 6. patrol pond inspection. The patrol pond should pay attention to observation of shrimp feeding, growth, water color, embankments, inlet and outlet gates, gate nets, etc., and encounter adverse weather conditions. In particular, it is necessary to observe and take timely measures to ensure the safety of shrimp ponds and the healthy growth of white shrimp. 7. Collect in time. Before and after the Spring Festival, the body length of white shrimp has grown to 5-6cm, and the market price is the highest. It can be listed and sold fresh.