38 results about "Soft-shell crab" patented technology

The invention discloses a method for culturing soft blue crabs indoors. The method comprises the following steps of: constructing a culture pond; making culture baskets; arranging the culture baskets; stocking crabs to be cultured; managing the culture and collecting soft crabs. Horizontal shelves are arranged in the culture pond so that water and air in the culture baskets are favorably exchanged like in natural environment. Meanwhile, dirt in the culture baskets is lessened to benefit the growth of the blue crabs in the baskets and lessen diseases, the culture baskets are respectively provided with hidden chambers containing sediment to naturally accommodate the blue crabs, benefit the growth of the blue crabs, reduce the interference of outside on the growth of the blue crabs and improve the survival rate, and the blue crabs are cultured in respective culture baskets to avoid a phenomenon of mutual fighting among individuals and improve the survival rate in the culture process. Accordingly, the method for culturing soft blue crabs indoors has higher survival rate and good culture benefits.

The invention relates to a method for breeding soft-shell crabs by a buoyant raft; the buoyant raft is built on the surface of larger or deeper water; net cages or porous boxes which are respectively provided with a single crab are respectively arranged on the buoyant raft; a bridge is built along the direction vertical to the buoyant raft; an air charging and discharging device and a sinker balance weight are installed in a plastic pipe of the buoyant raft; therefore, the soft-shell crabs can be bred. The method has the advantages of large scale, low cost, preventing the crabs from killing each other and reducing the damage risk of storm for breeding of the soft-shell crabs.

The invention relates to a soft-shell crab aquiculture facility, which solves the problems of conventional three-dimensional aquiculture structures, including complex water inlet and outlet structures and troublesome spatial arrangement, and also solves the problem that the deep water of each single aquiculture space of a conventional aquiculture structure cannot be circulated. The soft-shell crab aquiculture facility comprises a plurality of aquiculture boxes, all the aquiculture boxes are respectively arranged in rows and columns along the horizontal direction and the vertical direction to form a matrix type aquiculture structure, the bottom of each aquiculture box is provided with a vertical overflow tube, the overflow tubes of each aquiculture box and the lower neighboring aquiculture box are respectively arranged on the left half part and right half part of the bottoms of the respective culture boxes, the bottom end of the overflow tube of the upper aquiculture box is lower than the top end of the overflow tube of the lower aquiculture box, a water inlet tube is arranged on the tops of the uppermost row of aquiculture boxes, and a drain tube is arranged on the bottoms of the lowermost row of aquiculture boxes. Each overflow tube is provided with a siphon tube which runs through the wall of the overflow tube, the outer end of the siphon tube is attached on the bottom of the aquiculture box, and the inner end of the siphon tube stretches down to under the bottom of the aquiculture box along the inner wall of the overflow tube. The soft-shell crab aquiculture facility not only provides separate aquiculture spaces for soft-shell crabs, but also improves water circulation in the process of aquiculture, thus promoting the growth of the soft-shell crabs.

The invention relates to a method for culturing soft-shell green crabs indoors by using a cage. The soft-shell green crabs are cultured by using a pool made from glass or cement or a rectangular plastic bucket or a glass-steel bucket, and water is injected in the pool, bucket or cylinder to reach 30cm. The method comprises the following steps of: catching 50-250g of green crabs which do not finish reproductive molting from a culturing pool or in the field as molting crab seedlings, conveying living bodies of the molting crab seedlings to a molting pool and culturing, respectively putting each crab in a capped plastic cage with 21.5cm length, 15.5cm width and 35cm height or a plastic tank with holes, and then putting the plastic tank with holes or the plastic cage into a culturing pool and culturing, wherein the temperature of pool water is 20-32 DEG C, the salinity is 15-30, the pH value is 7.5-8.8, and the dissolved oxygen is more than 5mg / L; casting baits according to 5-10 percent of crab weight at nightfall or in the early morning everyday; and checking the molting or death situation of the crabs every 2-4h, moving the soft-shell crabs away, temporarily storing the living bodies in low-temperature water body, or quickly freezing and storing the living bodies for sale. The invention has the advantages of mutual green crab killing prevention, high crab survival rate, low soft-shell crab culturing cost, high appendage completion ratio of crabs and high soft-shell crab quality.

The invention discloses a soft-shell crab intensive-breeding and monitoring system which comprises a plurality of breeding boxes with numbers. The soft-shell crab intensive-breeding and monitoring system is characterized in that each breeding box is provided with an infrared sensing device connected with a control center, and the infrared sensing device is used for carrying out infrared shooting for crabs in the breeding box at intervals in preset time to obtain monitoring images and sending the monitoring images to the control center for unshelling analysis and judgment. When the judging result is that the crabs are unshelled, the control center automatically starts a reminding module for unshelling reminding and displays the number of the breeding box corresponding to the unshelled crabs. Manual periodic inspection is not needed, and the cost is reduced. Moreover, the interference on the unshelling of crabs cannot exist, and the survival rate is higher. Thus, the automatic production of the soft-shell crabs is realized, the production efficiency is greatly improved, and the labor cost is reduced.

The invention relates to a soft-shell crab aquiculture facility, which solves the problems of conventional three-dimensional aquiculture structures, including complex water inlet and outlet structures and troublesome spatial arrangement, and also solves the problem that the deep water of each single aquiculture space of a conventional aquiculture structure cannot be circulated. The soft-shell crab aquiculture facility comprises a plurality of aquiculture boxes, all the aquiculture boxes are respectively arranged in rows and columns along the horizontal direction and the vertical direction to form a matrix type aquiculture structure, the bottom of each aquiculture box is provided with a vertical overflow tube, the overflow tubes of each aquiculture box and the lower neighboring aquiculture box are respectively arranged on the left half part and right half part of the bottoms of the respective culture boxes, the bottom end of the overflow tube of the upper aquiculture box is lower than the top end of the overflow tube of the lower aquiculture box, a water inlet tube is arranged on the tops of the uppermost row of aquiculture boxes, and a drain tube is arranged on the bottoms of the lowermost row of aquiculture boxes. Each overflow tube is provided with a siphon tube which runs through the wall of the overflow tube, the outer end of the siphon tube is attached on the bottom of the aquiculture box, and the inner end of the siphon tube stretches down to under the bottom of the aquiculture box along the inner wall of the overflow tube. The soft-shell crab aquiculture facility not only provides separate aquiculture spaces for soft-shell crabs, but also improves water circulation in the process of aquiculture, thus promoting the growth of the soft-shell crabs.

The invention discloses a method for breeding a river crab by using a hanging basket in a pond and a crab breeding basket, and belongs to the technical field of river crab breeding. The method comprises the following steps of: placing the crab in the crab breeding basket; and hanging the crab breeding basket in water to breed to obtain mature crab, wherein one crab species is placed in each basket, one crab basket is hung in every square meter of water surface, and the crab baskets are arranged according to row spacing of 2m and plant spacing of 0.5m; female crabs and male crabs are arranged in an interlacing way; the crab breeding basket is a grass green and cuboid PVC (Polyvinyl Chloride) (specific gravity of 1.39) plastic grid basket of which the bottom is solid and the rest part is hollow, and consists of a basket body, an upper cover and a lifting handle; the upper cover is movable; mushroom fasteners are distributed around a frame and are inserted into mushroom plug holes on the frame of the basket body to be fixed; a feed is thrown from the hollow part of the upper cover; the upper cover is opened when the crabs are caught and put; and the dead weight of a finished product is about 300g. By adopting the method, the maiming and killing phenomena of the river crab caused by unaccomplished unshelling due to frightening of the same species and enemies during unshelling and injury of unshelled soft shell crab caused by the same species and the enemies can be solved; the bottle neck of mature crab recapture rate of 60-70 percent is removed, and the mature crab recapture rate reaches 100 percent; fence facility around the pond is removed; and mature crab menu type selling is realized.

The invention discloses instant blue crab food. The food which takes soft shell crabs as main raw materials has convenient transportation and storage and can be edible instantly. The following raw materials in weight ratio are cooked in water, sterilized and vacuum packaged into the food: 10 soft shell blue crabs, 50 to 100 grams of ginger, 30 to 70 grams of welsh-onion, and 30 to 70 grams of rice wine. The invention also provides a processing method for the instant soft shell blue crab food. The method can ensure that the guarantee period of the instant soft shell blue crab is 180 days with effective cold dispelling and sterilization.

The invention discloses a high-valued multifunctional processing ship for crustacea living bodies. The high-valued multifunctional processing ship comprises: a ship body with a refrigerating device, wherein the ship body is provided with a bay, and a circulating water treatment device and a water pump which are arranged in the bay and are connected with a fattening water slot unit; the fattening water slot which comprises a box body with an opening in one side, wherein a flap valve is arranged on the front edge of the box body; a drain outlet which can be connected with a water draining control device is formed in the bottom surface of the box body; bulged water guide bars which are in parallel arranged are arranged on the bottom of the box body; and structures such as a water inlet tube and the like are arranged above positions, far from the drain outlet, of the water guide bars. Synchronous level-to-level fattening can be carried out while catching is carried out, so that the crustacea living bodies with better fatness can be directly introduced into a freezing chamber for being frozen, and the crustacea living bodies with insufficient fatness can be frozen after being fattened or obtained soft-shell crabs can be frozen to increase the fishing value. The high-valued multifunctional processing ship has the advantages of being stable in structure, convenient for transporting and fattening, capable of effectively improving the quality of caught bodies, low in management cost, and not liable to deposit bits.

The invention discloses a method of utilizing wild crabs to produce soft-shell crabs. The method is used for lowering production cost of the soft-shell crabs to facilitate popularizing of soft-shell crab production. The method includes following steps: catching the wild crabs, dividing the wild crabs into different batches according to individual size and molting cycle, and respectively putting the wild crabs into different temporary breeding ponds; when the crabs of a same batch in the temporary breeding ponds grow into the molting cycle, putting the crabs into a production pond; utilizing a sieve plate to regularly salvage soft-shell crabs becoming big in body type due to molting in the production pond; quickly freezing the soft-shell crabs which are salvaged. By the method, wildly caught crabs identical in body type and molting cycle are bred in a centralized manner, and when the crabs of the same batch almost enter the molting cycle, the sieve plate is adopted to salvage the crabs being big in body type after molting is completed to complete production of the soft-shell crabs; production cost or labor intensity of workers is greatly lowered, and popularization of soft-shell crab production is facilitated.

The invention relates to the technical field of aquaculture, in particular to an in-water cage cultivation technique for fast-growing sea crabs, comprising cultivation facilities and cultivation operations. The in-water cage cultivation technique is characterized in that a cultivation pool is located at seaside, water in the pool is 1.5 meters in depth, the water is transparent at a depth of more than 1 meter, the water temperature is 20-30 DEG C, and the salinity of the water is 5-25 permillage; cultivation cages for green crabs are arranged, each cultivation cage consists of an upper body and a lower body, the lower body is a cultivation chamber, the upper body is a feeding and observing chamber, and circular holes with diameter of 1 cm are distributed around the cultivation cage; a plurality of cultivation rafts for placing the cultivation cages are arranged, and each cultivation raft is provided with a frame made from 3-4 PVC (polyvinyl chloride) tubes; an operation platform leading to the two sides of the pool is set up at the middle position of the cultivation pool; the green crabs are cultivated according to a proportion of 60 thousands of green crabs per 10 thousands square meters of cultivation water surface, for each cultivation cage, the ratio of daily feeding amount to the body weights of the crabs is 1 / 10, and feeding is performed once every day. With the adoption of the in-water cage cultivation technique for the fast-growing sea crabs, the limitation of indoor industrial cultivation is broken through, the soft-shell green crabs can be cultivated in a natural environment in a large area, the large-scale production of the soft-shell crabs is realized, and the cultivation cost is greatly reduced.

The invention provides a method for artificially cultivating soft-shell blue crabs, which relates to a method of breeding blue crabs. By using the method, the soft-shell crabs can be obtained quickly and the survival rate of the soft-shell crab can be improved. The method comprises the following steps: dividing the blue crabs into three classes, and choosing the blue crabs in the first and second classes as the cultivated objects of the soft-shell crabs; putting a single blue crab in the first class in a crab pot, stacking and binding 3 to 5 crab pots together to be a group of crab pots, and then putting the groups of crab pots into a cultivating pool for intensive cultivation; during the cultivation period, transferring the whole group of crab pots to a black barrel or a small pond in which a natural shell-removing agent is added to soak every day; putting the crab pots into calcium hydroxide solution to soak and disinfect and promote calcium absorption and shell removal, and then putting the blue crabs subjected to socking into the original cultivating pool again; timely selecting out the blue crabs which just remove shells and transferring, then carrying out low-temperature paralysis fresh preservation or cryopreservation on the selected blue crabs; carrying out mixed group cultivation on the blue crabs in the second class in a cultivating pool, after the state of the blue crab in the second class in the shell removing cycle enters the state of the blue crab in the first class, selecting out and transferring the blue crabs to the crab pots, then cultivating the blue crabs to be the soft-shell crabs.

The invention provides a method for artificially cultivating soft-shell blue crabs, which relates to a method of breeding blue crabs. By using the method, the soft-shell crabs can be obtained quickly and the survival rate of the soft-shell crab can be improved. The method comprises the following steps: dividing the blue crabs into three classes, and choosing the blue crabs in the first and secondclasses as the cultivated objects of the soft-shell crabs; putting a single blue crab in the first class in a crab pot, stacking and binding 3 to 5 crab pots together to be a group of crab pots, and then putting the groups of crab pots into a cultivating pool for intensive cultivation; during the cultivation period, transferring the whole group of crab pots to a black barrel or a small pond in which a natural shell-removing agent is added to soak every day; putting the crab pots into calcium hydroxide solution to soak and disinfect and promote calcium absorption and shell removal, and then putting the blue crabs subjected to socking into the original cultivating pool again; timely selecting out the blue crabs which just remove shells and transferring, then carrying out low-temperature paralysis fresh preservation or cryopreservation on the selected blue crabs; carrying out mixed group cultivation on the blue crabs in the second class in a cultivating pool, after the state of the blue crab in the second class in the shell removing cycle enters the state of the blue crab in the first class, selecting out and transferring the blue crabs to the crab pots, then cultivating the blue crabs to be the soft-shell crabs.

The invention discloses a method using hard shell crabs to cultivate soft shell crabs, comprising the following steps: more than 50 grams of hard shell crabs are obtained as molting crabs for cultivation from natural waters or crab culture ponds; the living hard shell crabs are transported to a molting pond in the shortest time to be singly cultivated in mesh cages or perforated plastic boxes; according to the difference of the crabs for cultivation, when the hard shell crabs are used for cultivating the soft shell crabs, the pH is 7.0-8.8, and dissolved oxygen is more than 5mg / L; the salinity is 15-35, and the temperature is 18-32 DEG C, so that the crabs are in the best molting environment. The molting rate is increased, and the mortality rate is reduced. The molting or death condition of the crabs is checked once every 2-4 hours, and the dead crabs are taken out and then are disposed. The soft shell crabs are moved out for temporary storage of living out of water, or low-temperature living temporary storage, or deep freezing storage to be sold. The method has the advantages of short molting cultivating time, no feeding and stable water environment, and basically does not change the water.

The invention provides an industrial synchronous preparation method of scylla paramamosain soft-shell crabs. The method comprises the steps that screened scylla paramamosain is put into breeding boxesof a breeding circulation system with lighting facilities respectively, and the temperature of aquatic water is adjusted to be 30 DEG C, the pH value is adjusted to be 7.8-8.6, and breeding is conducted for 48-72 hours, and the soft-shell crabs are collected during breeding; the screened scylla paramamosain is the scylla paramamosain with cracks appearing between back shells and abdominal shellsor claws; for the aquatic water, the temperature is 30 DEG C, NH4-N is smaller than 0.5 mg / L, DO is greater than or equal to 5.0 mg / L, the pH value is 7.8-8.6, S is 20, and the transparency is 30-60 cm. By means of temperature and environment control, the synchronous molting rate of the scylla paramamosain reaches a certain scale within a short period of time. Compared with soft-shell crabs produced through basket breeding in a traditional aquaculture pond, the same amount of soft-shell crabs are bred and produced, a culturing farm occupies less land, the labor intensity of workers is greatlyreduced, the production efficiency is increased by 5 times or above, operation is easy, the method is suitable for scale production, the cost is lowered, and the aquaculture benefit is increased.

The invention belongs to the field of breeding of aquatic products, and discloses an indoor circulating water three-dimensional swimming crab temporary fostering and fattening and soft crab breeding method. Breeding equipment and the breeding steps are included. The method can provide a project for obtaining excessive profits for investors, and makes a contribution to society. Due to the indoor circulating water three-dimensional ecological swimming crab temporary fostering and fattening and soft crab breeding, all conditions are controllable, the steps are carried out according to the program strictly, and the quality of produced crabs and soft crabs is obviously higher than that of crabs growing in the natural world and crabs bred in other ways. Meanwhile, the thermal insulation processing is carried out on the breeding equipment, so that waste of resources is reduced, breeding cost is lowered, and the biggest considered problem for the indoor circulating water three-dimensional aquatic product breeding is solved; one monitor camera monitors the growth conditions of dozens of crabs, labor intensity of workers is relieved, labor cost is lowered, and the quality of the crabs is ensured; selling profits of live soft crabs are higher than those of frozen soft crabs, and the investors can obtain higher profits.

The invention discloses a crab shelling protector which is used in the field of breeding crabs in sea and fresh water in fishing industry and plays a role of shelling growing protection in high-density breeding of crabs. Crabs need to shell for over ten times so as to grow, in the growing process, one main reason for not having high output of the crabs is as follows: the phenomenon that crabs with hard crusts kill and devour crabs with soft crusts seriously exists in shelling due to different sizes and grow speeds and nsynchronous shelling. The crab shelling protector is invented by adopting plastic to be injected and molded, the crab shelling protector is spliced and designed integrally, is provided with a crossed baffle plate and two transverse faceplates which are all connected from left to right, comprises four crablet baffle plates, has an upper cover and no bottom and includes 8 cabins when crablets are bred, when the carblets grow to be 8 centimeters, the crablet baffle plates are removed to form 4 cabins of adult crabs, and the crabs are not killed and devoured by the crabs with hard crusts and other organisms in the process of shelling from crablets to adult crabs, thereby the crab shelling protector plays a role of all-sided protection. The invention is applied to breeding portunids, blue crabs, river crabs in fishing industry and has a guarantee for improving the output.

The invention discloses a compound povidone-iodine solution for a crab shelling period and a preparation method of the compound povidone-iodine solution, and belongs to the technical field of aquaticproduct disinfection. The compound povidone-iodine solution provided by the invention is prepared from the following components in percentage by mass: 10 to 50 percent of a povidone-iodine solution, 1to 20 percent of 20-hydroxyecdysterone, 30 to 45 percent of a solution A and 10 to 35 percent of a surfactant, wherein the solution A is prepared from the following components in percentage by mass:20 to 50 percent of rheum officinale, 10 to 35 percent of cortex phellodendri, 10 to 35 percent of radix scutellariae and 20 to 50 percent of purified water. According to the compound povidone-iodinesolution provided by the invention, the disinfection effect of the povidone-iodine solution is not influenced, and meanwhile, the synchronous shelling rate of crabs can be increased, the immunity of soft-shell crabs in the shelling period of the crabs is improved, autogenous residual food is avoided, the effective iodine content is high, and the stability is better.

The invention discloses an infrared monitoring method and an infrared monitoring device for crab shelling. A crab is subjected to infrared shooting at preset time interval so as to obtain a monitoring image, and the monitoring image is subjected to image identification to judge whether the quantity of the crab is changed into two; if the quantity of the crab is changed into two, shelling is ended, and reminding of the end of the crab shelling is given; no manual regular inspection is needed, and the cost is reduced; furthermore, no interference to the crab shelling is generated, and the survival rate is higher. Therefore, automatic production of soft shelling crabs is realized, the production efficiency is greatly improved, and the labor cost is reduced.

The invention belongs to the technical field of food preparation, and relates to canned soft-shell crabs. The canned soft-shell crabs comprise the main raw materials of the soft-shell crabs, Chinese chestnuts, basil and the like. The preparation technology of the canned soft-shell crabs comprises the following steps: selecting fresh soft-shell crabs, performing thorough cleaning, performing salting, putting the salted soft-shell crabs in a cooking pot loaded with Jimo rice wine and maifan stones, performing cooking, smoking the cooked soft-shell crabs, preparing juice, finally performing canning, performing sealing and performing sterilization. The canned soft-shell crabs are free from additive and fresh and delicious in flavor, the selected raw materials are green and purely natural, theformula is scientific and reasonable, the making technology is simple, the canned soft-shell crabs are rich in nutrients and convenient to eat, and the application environment is friendly.

The invention discloses a soft shell crab production pool having a soft shell crab automatic collection function, which is used for reducing workers required by soft shell crab production so as to reduce the cost. The soft shell crab production pool include a water pool; two ends of the bottom of the water pool are inclined; a sieve plate capable of doing reciprocating slide between the two ends of the water pool is arranged in the water pool; a plurality of sieve holes are formed in the sieve plate, the size of the sieve holes 5 is greater than that of crabs which are just input and is less than that of exuviated crabs; and a clearance between a side edge of the sieve plate and a side wall of the water pool and a clearance between a bottom edge of the sieve plate and the bottom of the water pool are less than 1cm. exuviated soft shell crabs having a large size are caught out of the water pool through the sieve plate, workers do not have to stare at soft shell crabs, the production cost and the working load of the workers can be reduced and lowered, and promotion of soft shell crab production is facilitated.

The invention discloses a soft shell crab production pool having a soft shell crab automatic collection function, which is used for reducing workers required by soft shell crab production so as to reduce the cost. The soft shell crab production pool include a water pool; two ends of the bottom of the water pool are inclined; a sieve plate capable of doing reciprocating slide between the two ends of the water pool is arranged in the water pool; a plurality of sieve holes are formed in the sieve plate, the size of the sieve holes 5 is greater than that of crabs which are just input and is less than that of exuviated crabs; and a clearance between a side edge of the sieve plate and a side wall of the water pool and a clearance between a bottom edge of the sieve plate and the bottom of the water pool are less than 1cm. exuviated soft shell crabs having a large size are caught out of the water pool through the sieve plate, workers do not have to stare at soft shell crabs, the production cost and the working load of the workers can be reduced and lowered, and promotion of soft shell crab production is facilitated.

The invention provides soft shell crab dry powder and a processing method thereof. Compared with the prior art, a product keeps nutritional ingredients of original soft shell crabs, the water content is smaller than 5%, and the product is porous and can be processed into powder easily; nutritional value is high; the soft shell crab powder product produced through the method is high in protein content and rich in amino acid ingredients necessary to the human body; in addition, the soft shell crabs contain highly-unsaturated fatty acid such as EPA and DHA beneficial for intelligence development, and play an important role in improving the living standard and protecting human health.

The invention belongs to the field of aquaculture, and relates to a method for breeding large river crabs and soft crabs in indoor circulating water in three-dimensional mode. According to the method, an ecological breeding device and a breeding method are involved. Bionic breeding is performed according to the growing characteristics of the river crabs. A breeding box can guarantee saturated dissolved oxygen supplying through oxygen supplying of interlayer micro-holes in the bottom, the rapid growing demands of the river crabs can be met, and the illness problem of the river crabs can be solved. An aquaculture constant temperature machine sets the optimal temperature for growth of the river crabs, and the speed of effective accumulative temperature increasing is reduced. The components of breeding water can be adjusted at any time so that the shelling requirements of the river crabs can be met. The river crabs are bred in independent chambers, the survival rate of the river crabs can be more than 95 percent, the expense of purchasing breeding crabs can be reduced, and the recapture rate can be 100 percent. Palatable bait is provided, waste is changed into wealth, meat and vegetables are matched, more nutrients are obtained, and money can be saved. People do not live by depending on the weather any more, the river crabs can be produced at all seasons, and the stable, high and efficient yield is guaranteed. It seems that the investment is large, but from a long-term view, tens of times of benefits can be obtained through the method compared with other breeding methods. The method can also be used for river crab breeding.

The invention discloses a method for producing soft-shell crabs by using wild crabs, which is used to reduce the production cost of soft-shell crabs and facilitate the promotion of soft-shell crab production. For different batches, put them into different holding ponds respectively; when the same batch of crabs in the holding ponds grow to the molting stage, put them into the production pond; And the soft-shell crabs that have become larger; the soft-shell crabs that have been salvaged are quick-frozen. In the present invention, the wild-caught crabs with the same body shape and the same molting period are intensively cultured. When the crabs of the same batch almost enter the molting period, the crabs that become larger after molting are salvaged by the sieve plate, that is, the production of soft-shell crabs is completed. ; Production cost or labor intensity of workers are all greatly reduced, which is conducive to the promotion of soft shell crab production.

The invention relates to a soft-shell green crab cultivating method. The method includes the steps that green crabs which weigh 50-250 g and are not pubescent yet are obtained from natural sea area or a crab cultivating pond to serve as moulting juvenile crabs; the juvenile crabs are cultivated into heavy shell crabs in a field buoyant raft cultivation pond or indoor cultivation pond; the heavy shell crabs are transferred into the indoor cultivation pond in time to be cultivated into soft shell crabs. In the heavy shell crab and soft shell crab cultivation stage, the pH value is 7.0-8.8, dissolved oxygen is 5 mg / L or above, the salinity is 15-35, and the temperature is 18-32 DEG C. during heavy shell cultivation, the heavy shell or death condition of the crabs are checked once at the interval of 2-3 days, the heavy shell crabs are transferred to the soft shell crab cultivation pond to be cultivated in time, and the moulting or death condition of the crabs are checked once at the interval of 2-4 hours, and the soft shell crabs are transferred out for sale.

The invention discloses a method for breeding soft-shell blue crabs. 50 to 250g of blue crabs which are not sexually mature from a natural sea area or crab culture pond are taken as unshelled crabs, and the method comprises the following steps of: breeding the crabs into heavy shell crabs in a filed buoyant raft culture pond or an indoor culture pond; and timely transporting the heavy shell crabsinto the indoor culture pond, and breeding into soft-shell crabs. At the stages of breeding the heavy shell crabs and the soft-shell crabs, the pH is between 7.0 and 8.8, the dissolved oxygen is over5mg / L, the salinity is between 15 and 35, and the temperature is between 18 and 32 DEG C. During breeding the heavy shell crabs, the heavy shell or death condition of the crabs is checked every 2 to 3 days, the heavy shell crabs are timely transported into a soft-shell crab culture pond for breeding, the unshelled or death condition of the crabs is checked every 2 to 4 hours, and the soft-shell crabs are removed for sale.