Penaeus vannamei and green prawns were reared on the same pond, namely a pair of Penaeus vannamei and one puppies of green prawns. Penaeus vannamei is a tropical shrimp, and the conventional breeding and production cycle is only about 120 days. Adopting Penaeus vannamei and penguin rotation can effectively improve the utilization rate of the pond and increase the economic benefit. The technology is introduced as follows:
First, the time of convergence in early May clearing pond disinfection, from mid-May to early June put the shrimp shrimp Penaeus vannamei, in the temporary holding pool for the second desalination, from mid-June to mid-October, Penaeus vannamei shrimp breeding period In mid-October fishing sales began. In early November, clear ponds were disinfected, and after the disappearance of their medicinal properties, young shrimps were placed. From mid-November to the end of April of the following year, the shrimps were reared for a period of time. During this period, they can be collected and listed several times.
Second, Shrimp pool facilities Shrimp pool area of â€‹â€‹10 to 30 acres, water depth of 2 to 2.5 meters, non-polluting water sources, into the drainage convenient. Electricity and land and sea transportation facilities. Each 3-acre water surface is equipped with a 3-kilowatt aerator, a water inlet is equipped with a pump, and the joint household can be equipped with a simple feed processing machine. Each shrimp pond is equipped with a 2- to 3-ton cement boat. In order to support seedlings, a temporary holding pool that accounts for about 3% of the area of â€‹â€‹Datang can be excavated in one corner or one end of Datang.
Third, the clear pond disinfection After the end of each squid fishing, must drain the pool water, remove the surface silt; drying pond to the surface of dry cracks can be. About 2 weeks before planting, dissolve 100 kg of quick lime per acre and spread the bottom of the pool evenly. Dip the tanks manually and cover the bottom of the pool every few days. Use 2 to 3 kg per mu. "Oxidized chlorine" and soaked 50 kg tea seed cake Quanchiposa. Inject clean water 1 week before planting.
Fourth, shrimp seedlings Penaeus vannamei reared in the holding pool in the second desalination training about 15 days (pitch density per square meter of 1000 to 1500) into the feeding pond. The holding pool is then stocked with eggs, broodstock, and self-breeding young shrimp. Stocking densities: 30,000 shrimps per acre per acre, 10,000 acre shrimps per acre, and 50 acre per acre 80 tails.
5. The protein content of the diet fed by Penaeus vannamei is in the range of 20% to 35% (from 35% to 30% in larval shrimp, from 25% to 20% in middle prawn and commercial prawn), and the daily feeding amount is shrimp. Proportion of weight larvae (3 grams or less) 7% to 9%, middle shrimp (3 to 6 grams) 5% to 7%, adult shrimp (6 grams or more) 3% to 5%, fed twice a day, with Feeding in the evening is the mainstay. Less than 2 millimeters of feed particles in the early stage, 3 to 4 millimeters in the middle and later stages, and later feed some small fish, snails, clams, quail meat and other animal feed. When the temperature of water in winter and spring is low, fresh shrimp can be fed once in a sunny day at sunny place. The growth period is based on 3% to 5% of the body weight of the shrimp.
Sixth, water quality regulation During the development of the water quality pH is maintained at between 7.6 to 8.3, dissolved oxygen above 5 mg/l, transparency is maintained between 25 to 35 cm. According to the thin water of the pool, the weather conditions appropriate fertilization, take a small number of fertilization methods, so that the water is yellow-green or dark brown. Add new water regularly. During the peak season of growth of South American white shrimp, aerators are opened twice a day, each time for at least 2 hours.
VII. Day-to-day management Adhere to the morning and evening patrol ponds, observe the shrimp pond water environment and shrimp feeding activities, and identify problems and take timely measures. To prevent P. vannamei disease, the following measures can be taken: (1) When the shrimp is stocked, use â€œformalinâ€ solution for 2 to 3 minutes. (2) Use "Bromochlorohydantoin" Quanchiposa disinfection every 15 to 20 days during growth. (3) Use photosynthetic bacteria once every 20 days or so. (4) Regularly add a certain amount of allicin, multivitamins, and "King shrimp King" to the feed.
Eight, shrimp harvest South American white shrimp use the net to catch, a small amount of harvest available cages, dip nets and other nets to catch shrimp.
IX. Precautions (1) Selection of white shrimps in South America should be subject to strict quarantine of healthy shrimps. (2) Regularly measure the growth of shrimp (usually once every 15 to 20 days), and adjust management measures such as feeding and fertilizing for growth.
Author: Yifeng Town Fisheries Station, Yandu County, Jiangsu Province
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