An Extract is a substance made by extracting a part of a raw material, often by using a solvent such as ethanol or water. Extracts may be sold as tinctures, absolutes or in powder form. The majority of natural essences are obtained by extracting the essential oil from the blossoms, fruit, roots, etc., or the whole plants, through four techniques.
Now this is used in medicine area to help to get the pure substance of the herb. This kind shows several most popular extracts in the market.
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(1) Choose Tangkou: The pond area is required to be 8-10 mu, with abundant water, good water quality, water depth of more than 2 meters, and slope ratio of 1:25. In the newly opened pool, one to 4-6 meters wide shrimp ditch should be opened at the bottom of the pool for fishing. According to the scale of farming, the high drainage and low row technology should be used to build the drainage system.
(2) Doing a good job of seedling cultivation: Feeding two seasons of Macrobrachium rosenbergii, it is necessary to build a plastic greenhouse in advance. From late March to early April, we will purchase fresh and intensive shrimp seedlings to strengthen cultivation, and strive to reach 3 cm in mid-late-season shrimp species. To ensure the stocking needs of the previous season, at the same time, mid-to late-May purchase of Macrobrachium prawn cultivation in the middle and late, to about mid-August shrimp species specifications reached 3 cm for stocking in the second quarter. In the first quarter of the season, Macrobrachium rosenbergii was reared to raise green shrimp. In mid-to-late May, stocks of Macrobrachium roxburghii were stocked, young shrimps were nursed in special pools, and the nursery was selected in early June. Several members of the small cages were set up to stock their eggs. At the end of September, shrimps are nearly 3 cm in size.
(3) Reasonable stocking: Two-season breeding of Macrobrachium rosenbergii, with 0.8-1 million tailstock per mu in the first quarter, and 1-120 thousand tails per acre in the postseason. Former season prawn Macrobrachium post-season prawn, Macrobrachium praecox 2-35 thousand tails per acre, or 1-1.5 million shrimp species, 1.5-20 million shrimp species per acre for shrimps, ready to be stocked before stocking Cleaning and disinfection, cultivating basic baits, transplanting plants, etc. Choose blue sky morning stocking, pay attention to the temperature difference not too large.
(4) Feed Investment: Feed two shrimps, which can be fed respectively with Macrobrachium praecox and shrimps. For the breeding of Macrobrachium rosenbergii, Taihu Lake can be fed mainly with snails, clams, and quail meats, supplemented with compound feeds, and the rest of the area is based on a series of formulated feeds, which are appropriately fed with small fish and small shrimps. In the juvenile stage, the feed protein content is required to be above 35% and the shrimp stage requires more than 32%. Feeding the feed is mainly in the evening, accounting for about 70% of the total feeding amount. During the daytime, the feed was put in deep water area and put in shallow water and grass at night. The timing, fixed point, quantitative, and qualitative feeding were used. The daily feed volume of Macrobrachium praecox was 5-10% of the shrimp in the pond and 3-5 times for the green shrimp. %.
(5) Water quality management: From May to June, during the initial period of shrimp fish or shrimp species stocking, the pool water depth should be maintained at 0.8m; during the high-temperature season from July to September, the pool water should be filled, and the autumnal rainy and hot weather should be based on water quality. Change fresh water once in 10 days, changing water by 1/3 each time. Usually strengthen the water quality inspection and patrol ponds.
(6) timely arrest: two seasons Macrobrachium rosenbergii, from the beginning of the beginning of the month began to catch, arrested after the beginning of the month, the first quarter of Macrobrachium prawn first quarter of shrimp, Macrobrachium Roche since the middle of the month to catch big stay small, listed in batches, Green prawns will be listed on the market in the following year. If conditions are available, plastic greenhouses can be used as a means of raising them, and some of them will be sold at high prices around the Spring Festival.
Freshwater two-season shrimp aquaculture technology
Using plastic greenhouses to cultivate early-to-professional shrimp seedlings, from the middle of May to mid-August, rearing of Macrobrachium rosenbergii, from mid-August to October, rearing of Macrobrachium rosenbergii: or from 6 to 9 months prior to quarter feeding of Macrobrachium, 10 In May of the following year, a quarter of fresh shrimp will be raised again. In this way, breeding two-season shrimps a year can make full use of aquaculture water and feed resources, so as to greatly increase the economic benefits of ponds and shrimps and it is worth promoting.