Glutamic acid, is an acidic amino
acid. Molecules containing two carboxyl groups, chemical name for
α-amino-pentanedioic acid. Glutamic acid was discovered by lisuoxun in 1856, is
a colorless Crystal, fresh, slightly soluble in water, soluble in hydrochloric
acid, isoelectric point 3.22. Abound in cereal protein, animal content in the
brain and more. Glutamic acid in vivo protein metabolism plays an important
role in the process, participating in many important chemical reactions in
animals, plants and micro-organisms. Msg containing small amounts of glutamic
acid.
Function:
1.Active component for lasting moisturizing and resistance to dry
conditions of human skin.
2.Increasing the elasticity of human skin and keeping it tight and
smooth.
3.Inhibiting the formation of melanin remarkably.
4.Keeping pH balance of human skin.
5.Forming a slow-release delivery system and therefore improving the
absorption capacity of nutrients in cosmetics.
6.As a humectant, moisturizer to improve skin care quality, as a
whitening agent, has anti wrinkle property which gives long lasting effect.
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1 venue selection
1.1 Water Quality Environmental requirements: Select inner bay high tide area or high tide area with good seawater exchange, calm waves, and no pollution sources. The sediment quality is the coastal bottom and estuarine areas, preferably with freshwater sources, and the suitable salinity range is 6‰ to 26‰. . The main physical and chemical indicators of water: pH 7.5-8.6, salinity 6‰～26‰, optimal salinity 8‰-16‰, dissolved oxygen 5g/m3, ammonia nitrogen 0.5g/m3, hydrogen sulfide 0.1g/ Below the cubic meter, the chemical oxygen demand is less than 4 grams/cubic meter, and the transparency is 30 centimeters to 40 centimeters.
1.2 Pool Requirements:
1.2.1 Indoor cement pool: Set up flat-shaped film sheds on cement pools for overwintering in winter; heating and insulation can also be performed by electric heating rods, fish pond heaters, and boiler heating methods. The use of a free pool in a shrimp nursery is extremely suitable. This pool area is 50 to 100 square meters.
1.2.2 Outdoor greenhouses: Shelter stands and insulated plastic sheds cover the outdoor ponds. An area of ​​0.06 to 0.33 hectares is appropriate, with an average water depth of 1.2 meters or more and 0.3 to 0.5 meters at the bottom.
1.2.3 Earth Pond: The bottom of the tank is shaped like a pot, and the central groove and the ring groove are dug. The depth of the groove is 0.5 meters to 1.0 meters and the width is 2 meters to 6 meters. The ratio of the groove to the beach is 1:3, and the ditch and the gate are connected. Install a filter at the inlet, and install an escape prevention net at the drain gate. According to the habits of crabs, the deepest pool can store more than 2 meters of water; ponds are convenient for drainage and drainage. The area should be controlled within 1.33 hectares.
2 Preparation before restocking
2.1 Firstly, it is necessary to improve the anti-escape facilities. The indoor cement pools and outdoor greenhouses mainly inspect the intake and drainage facilities; the inner side of the ordinary holding ponds is equipped with anti-escape facilities such as oil felt, plastic sheet, cement board, and polyethylene mesh sheet. It is 50 centimeters.
2.2 The next Qingchi insult should be thorough. Prior to stocking, organic sediments, harmful organisms and pathogenic organisms should be removed. The indoor cement pool can be disinfected with 15ppm potassium permanganate solution; the outdoor pool can be cleared once with tea cake cake one week before stocking, killing the Chinese Wutang oysters, commonly known as cuckoo and other enemy fish, with 1500 hectares per hectare. Kilograms of fresh lime clear pond, 2 times for water.
2.3 In addition to the necessary finishing of the outdoor wintering pool, especially the old pond is best to open a new ditch.
3 Selection of female crabs When selecting female crabs, they must be differentiated according to their degree of fertilization and gonadal development. According to habits and experience, they can be divided into 4 types: unfertilized crab, thin crab, crab and crab. All three species were used as fattening crabs. The identification method is mainly to check the color of the central dot of the upper edge of both sides of the crab shell and the junction of the abdomen and the back edge of the head breastplate. When the crab species are in short supply, some unfertilized female crabs can be stocked, but they should be mixed with male crabs in a ratio of 3:1 male and female, allowing them to naturally mate and fertilize in the pool, and then grow into a crab.
When choosing, please also pay attention to the following requirements:
3.1 The individual is large (150-200 grams or more), and the crab body is free from injuries. Individuals have strong vitality, refreshed body shells, and green crustaceans.
3.2 Elimination of crab slaves and sea squirts.
3.3 healthy and disease-free. Distinguish from the muscle color of the base of footsteps, the strong flesh color is blue, the muscles of the limb joints do not subside and are strong; the diseased crabs are yellow-red or white, and the muscles of the limbs are subsidence and inelastic.
3.4 The open time of blue crabs should be shorter. The shorter the time from catching to stocking, the better. When the temperature is above 28°C, it should not exceed half a day, and below 25°C, it should not exceed 2 days. If the big crabs of the crab stand upright, open enough, open their tentacles, pick up their tentacles, bulge on the umbilical cord, and spit white foam at the mouth, it means that the crab has been out of water for a long time after catching and is not suitable for temporary raising and fattening.
4 Stocking Density Control: Green crab stocking density indoor cement pool control in the 4.5 ~ 7.5 / square meter; outdoor pond stocking control in the 2 ~ 4.5 / square meter, pond facilities, better density can be properly increased.
Stocking time: The stocking of the Zhejiang coast is from September to early December. The three-headed crabs are controlled in the late November or early December. Before stocking, we must strictly carry out drug soaking treatment to kill the body surface bacteria. Can be soaked with 5 g/m3 potassium permanganate solution for 5 minutes or soaked with pure fresh water for 5 to 10 minutes.
5 daily management control water level to maintain water temperature: in the sunny morning can lower the water level to increase the water temperature, afternoon water; indoor pool water level in the 0.5 to 1 meter, control water temperature above 9 °C, and 12 °C is appropriate, salinity 10 ‰ ~ 20 ‰, pH is between 7.8 and 8.5, DO ≥ 5 g/m3, and light is protected from light stimulation. Keep the water level in the outdoor pool above 1.5 meters. When the cold wave arrives, increase the water level again. For the low water level ponds to strengthen the water temperature control during the cold current, you can use the water pump to extract the deep well seawater or enter the side row to maintain a higher water temperature.
6 Feeding The bait should be fed at a water temperature of 10°C or above. Fresh fish, shrimp, or low-value shellfish should be used as the feed. Timely growth can increase the resistance of the crab. Feeding amount was controlled at 2% of the total weight of the crab, that is, the amount was increased by 2 hours after feeding in the evening.
7 Disease control and management Disease control In addition to dredging and disinfection, microbiological preparations such as photosynthetic bacteria, zeolite powder, and natural water quality improvers are occasionally used. Every time there is a large number of deaths of polyculture shrimps such as shrimp and white-tailed shrimp, timely and cautious medication should be used. On the one hand, disinfectant preparations are used to disinfect water and block the transmission of pathogens and viruses to blue crabs, and on the other hand, to feedstuffs. Add biological antibacterial agents such as allicin (50 grams per 100 kg).
8 Timely arrests Under adequate and well-managed bait, thin crabs and crabs will be raised for 15 to 60 days, and they will be bred and sold for sale. The arrest time must be mastered, especially the outdoor pool. It should be completed before 4 pm and the water should be promptly filled to prevent the crabs from being frozen. Green crabs should be cleaned after catching and transported by chaff or hay wrapped in a foam box.
Blue crab wintering technology
Under natural conditions, when the water temperature is lower than 16°C, the daily activity time of the crab is shortened and the food intake is reduced. When the water temperature is 12°C to 14°C, it begins to dig caves; the water temperature drops to 7°C, and it enters the cave and enters dormancy. In addition to wintering in natural ponds, the blue crabs control the temperature of winter water under artificial facilities. During the period prior to the sale of blue crabs, appropriate technical measures are taken to make them grow quickly. Usually refers to the mating female crabs after a short period of time to strengthen the cultivation, so that their ovaries fully mature, become cream crabs; or have reached the size of the product but the weight of the male crab, bred a fat crab. To adapt to the winter market to increase the value of the green crab commodity.