First, the biological characteristics of white-tailed shrimp (I) Inhabitation habits The white-tailed shrimp lived in the near shore and in the shallow sea and had strong adaptability to the environment. The suitable range was from 2°C to 39°C. The salinity ranged from 3 ‰ to 30 å‡, and it could adapt to the growth in brackish water. However, the tolerance to hypoxia is poor. Below 1 mg/L, it will die due to lack of oxygen. (b) Diet and growth The tail-tailed white shrimp has a wide range of dietary habits and can feed on both animal and plant foods. The growth cycle is short, 2 to 3 months can be grown into commercial shrimp. In three years, you can raise 3 miles. (III) Breeding habits The white-tailed white lobster has a good ability to reproduce, and it holds egg-bearing shrimp almost all the year round. A mature female, holding 300 to 400 fewer eggs, and more than 2000 to 2500, the breeding season generally occurs in the spring, summer and autumn three seasons, a year can be reproduced about 10 times. Second, ridge tail white shrimp breeding technology (a) shrimp pond conditions The general seawater ponds can be cultured, but it is especially suitable for the middle and bottom of the harbor. The seawater salinity is low, and the ponds rich in natural white shrimp resources in the nearby sea area are the best. Aquaculture ponds should be selected to be free of pollution in the surrounding environment, with less silt in the ponds, with an area of ​​15 to 25 mu. It is advisable to separate the ponds into the drainage system, and it is better to enter the drainage when the tide is small. There is a ring ditch in the pond. The water depth of the pond surface is 0.5 to 0.8 meters, and the water depth of the ring ditch is about 1.5 meters. (b) Seedlings: natural seedlings or artificial seedlings (Dichi) 1, Na natural seedlings can take the following methods according to different situations: (1) After catching prawn in a seawater pond, attention should be paid to keeping the white shrimp in the pond. At the time of catching, the shrimp began to leave the gate at the end of a large number of white shrimps. At this time, they had to close the gates in time, and repeatedly put the shrimps. The shrimps could be released and the white shrimps could be kept. (2) Pay close attention to the occurrence of white shrimp seedlings in the sea area, and adopt the method of draining water from the vegetable net into the dense water net to enter the white shrimp seedlings. 2, artificial seedlings: The most widely used method is to use fertilizer and water to breed white shrimp seedlings, the main measures are: (1) To increase the density of shrimp seedlings in ponds by using fertilizer and water to breed white shrimps. Every time the white shrimp is caught in the pond, leave enough mature shrimp species (1 to 3 kg per mu), especially for the winter season. Leave the parents at the end of August in the lunar calendar. At this time, stop entering and draining the water and raise the bait through fertilization. Algae density, and appropriate feeding of fish and shrimp, egg yolk, and soy milk. The egg yolks to be fed should be wrapped in 120-mesh sieves and then kneaded into egg yolk suspension. Like the soy milk, Quanchiposa, egg yolk, and soy milk The daily dosage is 10 to 20 ppm. White shrimp have enough feed after hatching to increase the survival rate of shrimp seedlings. (2) If there are not enough eggs in the pond, they can be collected from the sea area and add about 200 mu. Especially in winter and spring, due to the seasons of collecting and harvesting of various products of Tong Pond, the white shrimps are severely deficient, and rely on parental breeding to meet the needs of the ponds. 3, breeding mode Sanmen Bay cultured white tailed prawn is mainly polyculture, with mixed crabs (blue crabs) and shellfish (fry or loach) as the mainstream. The output value of white-tailed white prawn accounts for one-third of the whole pond. More than 100 kilograms; followed by polyculture of shrimp, crabs, and shellfish. At this time, the white tailed prawn is a by-product. Due to the differences in harvesting methods between shrimp and white tailed prawn, and the fact that the white prawn is not subject to seasonal restrictions, it can improve the comprehensive benefits of the pond. 4: Feeding bait Adhere to feeding every day, shrimp can be used with food, fresh small fish, shrimp, wheat bran No. 4 powder, according to the season, weather, water temperature, tides, water quality and other environmental factors, combined with the actual feeding conditions, reasonably determined. According to the density of shrimp in the pond, the shrimp body water and feeding conditions determine the amount of feeding, which is less in the early period and gradually increases in the middle period. In the later period, as the water temperature decreases, the feeding amount or basically does not vote. Within 3 cm, according to 8 to 10% of the weight of the tail-tailed white shrimp, 3 to 5 centimeters are weighed from 5 to 8% of the weight, and 0.5 to 1 kg of bait per acre is fed. The water temperature in the winter falls below 5°C and the white shrimp does not eat. At this point stop feeding. 5: Clear the enemy It mainly removes fish that are predatory to the enemy. It must remove fish in time, use tea cakes in early stages, and combine fishing and catching and cage trapping in the middle and later stages. To clean up. 6: Water Quality Management The main physical and chemical indicators of the culture ponds are: pH value controlled at 7.8-8.6, optimal salinity 8-26, dissolved oxygen 5mg/L, ammonia nitrogen 0.5mg/L, hydrogen sulfide 0.1mg/L, chemical oxygen consumption 4mg/ L below, the pool water transparency 30cm ~ 40cm. The water level is maintained at about 1 meter, and the high temperature period and the low temperature period rise to 1.2 to 1.5 meters. The tide is mainly filled with water, usually 3 to 4 days, changing the water once, when the tide is changed as much as possible, enter the drainage once, change the amount of water 1020%, in order to promote the shelling of white shrimp, such as pond water quality is poor, to increase the amount of water. In the high temperature season, the daily water exchange capacity is increased to 20% to 40%. The water quality in the sea area is not good, and the water exchange interval can be appropriately extended. Before and after the change of water to avoid excessive changes in pool salinity, it should be controlled within 3%. From time to time, microbial preparations such as photosynthetic bacteria, zeolite powder, and natural water quality improvers are used. The photosynthetic bacteria with a concentration of more than 1 billion cells/ml were used to sprinkling 10 mg/L of total photosynthetic bacteria in the early stage of shrimp culture, and then sprinkled with 5 mg/L every 7 to 10 days. Zeolitic powder is spilled during the culture period and spilled from 100mg/L to 150mg/L every two weeks. 7: Daily management Every morning and evening, the pool is visited once and the ponds should observe the food intake, growth, color, embankment, inlet and outlet gates, gate nets, etc., and find that the problem is solved in time. When encountering adverse weather conditions, it is particularly necessary to observe and take timely measures to ensure the safety of shrimp ponds and the healthy growth of white shrimp. Regularly measure physical and chemical indicators such as water temperature, salinity, and pH, and growth indicators such as body weight and body length of white shrimp, and do a good job in production log records. 8: timely arrest After the white shrimp grows to 5-6 cm, it can be caught and listed. There are two ways to catch the shrimp: one is to use a shrimp cage for catching; the other is to start catching with water, that is, to place a tapered sleeve net on the drain gate. Gate water, shrimp with water into the net. 50 And 75 Feet Photoluminescent Exit Sign Exit Sign,Glow In The Dark Exit Sign,Afterglow Film,Afterglow Rigid Sheet JINAN REALGLOW CO.,LTD , https://www.realglowsign.com