In recent years, with the rapid development of the crab breeding industry, there have been new changes in the crab market. The sales of small-size crabs have been slow, and the large-size and high-quality crabs are still in short supply. In order to raise crabs, we must have high-quality crabs as a guarantee, and the demand for crab species is increasing day by day. The use of paddy fields to cultivate crab species is a good way to solve the problem of crab species, but must pay attention to the following technical problems. First, we must pay attention to specifications and quality requirements. The source of large-eyed larvae (ie, crabs) for culturing crabs should be authentic. It is best to use the parents of larval rearing crabs in lakes. Large-eyed larvae reproduce in accordance with standardization. Avoid purchasing “color seedlingsâ€. "Seawater seedlings", "green shoots", "high temperature seedlings", "for sale seedlings," "vegetable disease seedlings," "shell seedlings." The crabs bred require uniform specifications, robust physique, agile and powerful activities, no broken limbs, no injuries, and no parasites such as crab slaves and ciliates. In particular, the requirements for specifications: 100 to 300/kg is appropriate, and the size is too small (1000/kg or so) to lose the value of raising crabs; the size is too large (30 to 50/kg). precocious. Second, we must pay attention to the phased cultivation of young crabs in stages. It is the key to raising the survival rate of cultivated crabs in paddy fields. Generally divided into two stages: the first stage from the crab seedlings develop phase III crab (also known as "bean crab"), this stage experienced 13-15 days, the best time to lay the seedlings in mid-June, in the holding pool In the medium-term cultivation, the specifications for each phase are: 40,000 to 140,000/kg in Phase I, 20,000 to 40,000/kg in Phase II, and 10,000 to 40,000/kg in Phase III. In the second stage, crabs of stage III crabs are bred into crabs. This stage ends at the end of October. The crabs enter the paddy fields and grow. The specifications for each stage are: 0.4 million to 10 thousand/kg in phase IV and 1600 to 4000 in phase V. Only / kg, VI period 400-1600 / kg, VII period 200-400 / kg, VIII period 100-200 / kg. According to the above-mentioned specification standards, regular sampling is conducted during the cultivation process, and “control†or “promoting†measures are taken depending on the circumstances. Third, we must pay attention to regulating water quality. After the prevention of hypoxic larvae entering paddy fields, especially during the period from early July to the end of September, it was determined that the amount of dissolved oxygen in paddy fields was 1.3-4 mg/l (milliliter/l). When oxygen is severe, it is only 1.3-2.0 mg/l, and the asphyxiation point of crabs in the crab phase is 2 mg/l. Therefore, in order for the crabs to grow smoothly, the dissolved oxygen must be above 4 mg/l. It is mainly the old leaves of the seedlings, the crabs in the crabs that are not ingested or eaten by the crabs in the field, and the decay of some settled algae, as well as the excretions of the crabs, and the ammonia decomposition of ammonia caused by the decomposition of the animals. This leads to deterioration of the water quality, reduced dissolved oxygen, and the growth of crabs. The pods are unfavorable, but they cause the young crabs to stop growing, negative growth and death. Preventive measures are to increase the number of water changes, remove crabs that do not ingest food or eat incomplete water plants, and do not invest in rotting and deteriorating foods. Fourth, we must pay attention to the prevention of large-eyed larvae of juvenile crabs. After metamorphosis to stage I and II juvenile crabs, juvenile crabs do not ashore when they land ashore, or immediately drive off the water and go ashore, or die in water. Some mortality rates are as high as 95%. Causes: The quality of crabs is poor, the digestive organs are inflamed, the food is unpalatable, the food intake is insufficient, the water quality is deteriorated, ciliate attachment and drug abuse. Should take the above situation to take corresponding countermeasures: First, select excellent crabs, scientific and rational stocking; Second, timely adjustment of water quality, set a good attachment; Third, fertilizer and water culture basic bait, fed a good palatability, nutrition and food with a comprehensive; The fourth is to properly adjust the salinity of pool water and rationally use drugs for prevention. Fifth, we must pay attention to the control of crab precocious puberty mature crab demolition of the greater harm to the production, in the middle and lower reaches of the Yangtze River generally begin to die in late March and early April, the mortality rate as high as 60-90%. Most of the dead individuals were between 30-50g/bird, and there were also deaths of 16-29g/body crabs. Control measures of precocious puberty: appropriate amount of feed, reduce accumulated temperature, increase density, and adjust water quality.
Low Pesticide Goji Berry, also called EU standard Goji Berry. Ningxia goji berry enjoys a great fame around the global due to its high quality standard; meanwhile, it is the only protected product of geographical identity in China, goji berry has a great popularity describes as "goji berry of the world is in China, goji berry of China is in Ningxia and Ningxia's goji berry is the best".
1.Type Genus: Multi-branched deciduous shrub of Solanaceae Lycium
2.Another name: wolfberry, red berry, red pendant, blood berry, eye-brighten berry, Tzi-fruit, hoof berry, milk berry, immortality grass, sky-essence grass, wolfberry
3.Biology Character: illumination preferable, saline-alkali tolerance, fertilizer tolerance, drought-resistant, water stain should be sustained.
4.Medicinal Parts: goji berry/ goji berry leaves, goji berry roots. 
Low Pesticide Goji Berry
Low Pesticide Goji Berry,Low Pesticide Goji,Low Pesticide Residue Wolfberry,Low Pesticide Dried Goji Berry
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