111 results about "Shrimp farming" patented technology

The invention discloses a freshwater shrimp and river crab double main farming method which includes the steps that firstly, preparation is performed before farming; secondly, farming of seeds is performed; thirdly, under farming and management, freshwater shrimps are caught all the year round, the large freshwater shrimps are caught and the small freshwater shrimps remain; shrimps farmed in January are caught since May, and the large-specification freshwater shrimps are caught in time; shrimps farmed in August are caught since the end of September; river crabs are caught since October. According to the freshwater shrimp and river crab double main farming method, by increasing the freshwater shrimp farming percentage in a river crab farming pond and enhancing the freshwater shrimp farming management, the yield of the freshwater shrimps is improved, and the farming risks of river crabs are effectively avoided.

The present invention discloses a high-efficiency ecological cultivation method for macrobrachium nipponense. The method comprises: (1) preparing a shrimp pond; (2) disinfecting the shrimp pond; (3) planting and managing water weeds; (4) stocking and managing postlarvae; (5) carrying out oxygenation water quality management and oxygenation; (6) carrying out feeding management; and (7) catching adult shrimps. According to the present invention, the high-efficiency ecological cultivation method for macrobrachium nipponense is simple and easy in operation, can greatly reduce content of poisonous and harmful organic matters, residual feed and the like by virtue of management methods such as planting water weeds, matching filter-feeding fishes, reducing a mixed feed proportion, reasonably and effectively feeding, controlling water weed density, carrying out oxygenation by virtue of an aerator, and the like, thereby reducing cost investment and keeping water quality freshness. by postponing shrimp postlarvae stocking time and applying quicklime, occurrence of autumn propagated postlarvae can be inhibited; and by leaving an area besides a pond with no water weeds planted, feeding and growing of macrobrachium nipponense can be promoted. The macrobrachium nipponense cultivated by the method is high in yield, good in quality, high in large-size commercial shrimp rate, good in cultivation benefits, so that the health development of macrobrachium nipponense cultivation industry is promoted.

The invention discloses a runway type bioflocculation shrimp farming system and a runway type bioflocculation shrimp farming method. The runway type bioflocculation shrimp farming system comprises an aquiculture area and a bioflocculation constituent cultivation area, wherein the aquiculture area is located at the high end of a pond and is a water inlet end of the system; the bioflocculation constituent cultivation area is located at the low end of the pond and is a water outlet end of the system. According to the system and the method, the build-out cost is lower, the separation of the cultivation area of flocculating constituent and the growth area of shrimps is realized inside the pond, and runway type water flow is created inside the pond through the internal partition and the reverse placement of a waterwheel type aerator; a peristaltic pump can be used for coordinating the generation of bioflocculation constituent with the bait casting action; the separated bioflocculation constituent cultivation area is not only the production area of the bioflocculation constituent, but also is a treatment area for residual feeds, faeces and ammonia nitrogen of the aquiculture area. Practical results indicate that the water quality condition of a test pond is better than that of a contrast pond, and the yield of the test pond is obviously higher than that of the contrast pond.

The invention discloses a method for cultivating lobster in a greenhouses constructed in rice fields, and the method comprises: excavating a ring groove in the middle of the rice field as a nursery pond for crayfish, arranging an aeration, water inlet and outlet equipment, and constructing a simple plastic greenhouse on the ring groove, increasing water temperature in winter by utilizing heat preservation effect of sunlight to ensure that the crayfish can safely overwinter; constructing slope protection vegetation by using water plants such as Elodea, creating suitable cave habitat for crayfish to effectively improve the survival rate and breeding rate of the parent shrimps; feeding high-quality feed for increasing the gonad development speed of female shrimps, realizing premature spawningand hatching, achieving the purpose of commercial shrimps early entering markets and improving the yield and economic benefits of shrimp farming in rice fields.

The invention discloses a pond shrimp farming method which includes an early culture management stage and a culture management stage. The early culture management stage includes the steps: selecting a pond; setting a water treatment system; cleaning the pond; scientifically enriching water; arranging meshes; selecting and breeding high-quality breeds. The culture management stage includes the steps: managing feeding, water quality and fertilization; degrading ammonia nitrogen; discharging solid particles. By comprehensive treatment for shrimp farming, the purpose of efficient culture is achieved.

A preparation method of hairy crab feed, which is composed of: white fish meal, snail meat meal, clam meat meal, peanut kernel cake meal, herring meal, small kelp meal, agricultural shrimp meal, sweet corn meal, soybean protein meal, and bone meal. The stated percentages are percentages by weight; the above-mentioned hairy crab feed is low in cost and fast in growth, and has a good effect on feeding young crabs and adult crabs. The crabs raised are generally fat, and the disease rate of crabs is low. It overcomes the disadvantages that hairy crabs are slow to grow, small in size, light in weight, less active, poor in palatability and susceptible to various diseases due to various nutritional deficiencies in the existing feed.

The invention provides a novel aquaculture ecological circulating system and relates to the field of aquaculture. The novel aquaculture ecological circulating system comprises a reed planting area, a camphor forest, a poultry farming area, a first duckweed planting area, a second duckweed planting area, a crab farming pond, a fish farming pond, a shrimp farming pond, a freshwater shell farming area, a vegetable planting area, a water hyacinth planting area and a biogas tank. The problems are solved that adjacency of a crab farming pond and a poultry farming area in an aquaculture ecological circulating system is not good for the growth of crabs, the input cost of feed for farming crabs and shrimps is high, water purification efficiency is not high and comprehensive utilization rate is low.

The invention discloses a green and efficient method for culturing shrimps and crabs and cultivating rice in a rice field. The method comprises the following steps that rice field transformation is conducted, wherein digging is performed along the inner sides of ridges to form annular culture ditches, one culture ditch is widened and deepened to form a temporary culture pond, the center of the rice field is taken as a rice planting area, a plurality of field ditches are formed in the rice planting area through digging, and the field ditches are enabled to communicate with the culture ditches and the temporary culture pond; aquatic plants are planted; before putting larvae in the pond, anti-escape walls are arranged on the peripheries of the ridges, anti-escape nets are arranged the peripheries of the temporary culture pond, and protective nets are installed on the other three sides of the rice planting area except the side, adjacent to the temporary rearing pond, of the rice planting area; crab larvae and crayfish larvae are put in the pond; after crayfish culture and fishing are finished, the anti-escape net arranged on the side, adjacent to the rice planting area, of the temporary culture pond is reserved, the anti-escape nets on the other three sides of the temporary culture pond are removed, and river crabs enter the culture ditches; rice is cultivated, the protective netsof the rice planting area and the anti-escape net on the side, adjacent to the temporary culture pond, of the rice planting area are removed, and the river crabs are allowed to enter the rice field; and commercial crabs and rice are harvested. By means of the method, rice, shrimps and crabs are high in yield.

The present invention relates to a penaeus vannamei compound feed which includes the following raw materials in parts by mass: schizochytrium limacinum meal 15-20 parts, fish meal 20-25 parts, shrimp shell powder 2-4 parts, cuttlefish powder 2-4 parts, peanut meal 10-15 parts, soybean meal 15-20 parts, flour 15-20 parts, complex vitamins 0.3-0.4 part, choline chloride 0.3-0.4 part and zeolite powder 2-3 parts. The replacement of part of fish meal with the schizochytrium limacinum meal reduces the feed costs; The addition of the schizochytrium limacinum meal enables the amino acids of the feed to be more balanced and complementary, therefore improving the feed efficiency; the schizochytrium limacinum meal is rich in active substances which can enhance the immune function of the penaeus vannamei, prevent the occurrence of diseases, reduce drug use in shrimp farming, improve the survival rate and growth rate of the penaeus vannamei. The schizochytrium limacinum meal contains DHA, significantly reduces or completely doesn't require the addition of fish oil, reduces the excessive reliance on fish meal and fish oil, and the marine fish resources are protected, at the same time the feed cost is reduced and the shrimp farming benefit is improved.

The invention provides a method for in situ breeding of procam barus clarkii in winter leisure rice field, with an aim to solve the problem of the shortage of offspring seeds of procam barus clarkii in the winter leisure rice field through breeding of the procam barus clarkiil and promote steady development of rice and shrimp farming by adopting in situ breeding of the procam barus clarkii in thewinter leisure rice field which can be fully used in the mode. Through key techniques of 2) intensive parental breeding; 3), parental mating and egg bearing; 4), straw stubble and water level regulation and control of water-overflowed field; 6), water level management in winter and spring; 8), young shrimp breeding in spring and the like, the in situ breeding capability of the procam barus clarkiiis effectively improved, and yield of the offspring seeds is increased.

The invention discloses a water quality improver for shrimp farming and a preparation method thereof. The water quality improver for shrimp farming is prepared from the following raw materials in parts by weight: 30 to 40 parts of oyster shell powder, 10 to 15 parts of amino acid, 3 to 6 parts of microelement solution, 10 to 12 parts of vitamin solution, 6 to 10 parts of traditional Chinese medicine solution, 2 to 8 parts of fermented organic matter, 2 to 6 parts of sodium humate, 1 to 5 parts of polyferric sulfate, 2 to 5 parts of calcium sulfate and 3 to 7 parts of molasses. The prepared water quality improver for shrimp farming can effectively accelerate organic matters in a water body to be decomposed, greatly reduces the content of hazardous substances in water quality, restrains growth of malignant bacteria, promotes growth of beneficial alga, improves the oxygen content of the water body, effectively improves the water quality and greatly improves shrimp quality and yield.

The invention discloses a shrimp farming method. The method comprises the steps that an enclosed shrimp pond is built on the seaside, a second dike is arranged on the shrimp pond, the shrimp pond is divided into an A zone and a B zone, wherein the B zone is arranged on a place near the seaside, a first dike is arranged on the edge, the first dike is provided with a first water inlet, the second dike is provided with a second water inlet, the A zone is provided with a drainage exit and a third valve and a third filter net, the A zone is also provided with a blocking net, and the A zone is provided with a separating net, and the A zone is divided into a number of equal area compartments by the separating net. According to the breeding method, the A and B zones are provided, the farming zone is provided with the blocking net to prevent the blue crab from escaping in the farming process, the A zone is divided into compartments by the separating net which is favorable for the growth of the shrimp; the B zone is a purified water area, the amino acid chelate is adopted in the water purification to function as the sink pond role for chelate heavy metal, and an excellent environment is provided for shrimp farming.

A clam worm biofilter, which mainly comprises: a water inlet pipe is arranged on the top of the upper opening trough filter, and a drain pipe is arranged at the bottom of the pool, and the drain pipe passes through the bottom of the pool wall and is connected with the water pipe outside the filter tank by an elbow. The gravel layer, coarse sand layer, fine sand layer and soil layer are successively laid in the filter tank from bottom to top, wherein the diameter of the gravel is 1-3×1-2cm, the thickness is 8-12cm; the particle size of the fine sand is 0.5-1.0mm, The thickness is 13-17cm; the lower limit of the thickness of the soil layer is 10cm; the clamworms are stocked in the pool, and the density of clamworms is 600-2000 tails / square meter. Use industrialized fish and shrimp farming solid waste as the worm bait, put the bait into the filter twice a day in the morning and evening, the bait is 10-15% of the total weight of the worm in the filter; the method of changing the water in the filter : Every morning and evening, lower the mouth of the water pipe outside the pool, lower than the water level at the bottom of the pool, and when adding new seawater, inject 0.1-0.5 cubic meters of water per hour. The invention can not only be suitable for the growth of clamworms but also can make them concentrate on treating marine solid organic pollutants.

The invention discloses special fertilizer for rice-shrimp farming. The special fertilizer is prepared from biogas residue obtained after aerobic fermentation, auxiliary materials and a compound microbial flora, wherein the auxiliary materials comprise potassium fulvate, sodium humate and amino acid powder; the compound microbial flora is formed by lactic acid bacteria, bacillus subtilis and paenibacillus polymyxa; the ratio of the viable count of the lactic acid bacteria to the viable count of the bacillus subtilis to the viable count of the paenibacillus polymyxa is equal to 1.2 to 2.8 to 1;the adding amount of the compound microbial flora accounts for 1.4% of the total mass of the special fertilizer; the total adding amount of the potassium fulvate, the sodium humate and the amino acidpowder accounts for 30% of the total mass of the special fertilizer, and the mass ratio of the potassium fulvate to the sodium humate to the amino acid powder is equal 1 to 1 to 1. The invention alsoprovides a processing method of the special fertilizer for rice-shrimp farming and application of the special fertilizer in rice in the periods of 'breeding shrimp before rice cultivation' and 'breeding shrimp after rice cultivation' in a 'one-rice and three-shrimp' planting mode. The special fertilizer provided by the invention has the advantages of being low in production cost and excellent ineconomic benefit, protecting the ecological environment and the like, and has a great significance for promoting the development of the 'one-rice and three-shrimp' mode.

The invention belongs to the technical field of agricultural cultivation and relates to an inter-farming technique of water fennel and crayfish. The technique includes: cultivation of the crayfish and planting of water fennel. The technique is characterized in that a water fennel pond for planting of the water fennel is used for cultivating the crayfish during intervals of water fennel planting; the water fennel is planted in mid-August, starts to be harvested in mid-October and is completely harvested in early March of the next year; the crayfish is cultivated from mid-March, commercially available from June and completely captured in early August. Water fennel planting and crayfish cultivation are organically combined; the water fennel pond meets the basic growth requirements of the crayfish; the root and leaf of the water fennel and the pond are rich in good feeds, such as detritus and organic debris, which are favored by the crayfish; land (water surface) availability is improved, and planting and cultivating benefits are increased; the water fennel pond is built regularly and convenient for drainage and irrigation, and feeding management is facilitated. The technique has good economic benefit, is innovative among lobster cultivation techniques, and is suitable for popularization in water fennel planting places.

The invention provides a comprehensive planting and breeding method of eels, chicken lobsters and rice. The method includes the steps: selecting and reconstructing a breeding rice field; chicken lobster breeding: releasing young chicken lobsters after water temperature reaches 18 DEG C or more at the end of March to the beginning of April, catching large chicken lobsters in the middle of May, remaining small chicken lobsters in the rice field, and stopping catching of the chicken lobsters when the water temperature reaches 28 DEG C or more in the middle ten days and the last ten days of June;transplanting rice seedlings on the rice field after water levels of peripheral ditches of the rice field are lower than a plane of the rice field when water in the rice field is drained; eel breeding: erecting eel breeding net cages on the peripheral ditches of the rice field before the middle of June, releasing young eels on sunny days of the early ten days and the last ten days of July to culture the eels, catching the eels on the middle ten days and the last ten days of October, and disassembling the breeding net cages; young chicken lobster density controlling by the eels: releasing the eels into the peripheral ditches of the rice field on the middle ten days and the last ten days of October every year, catching the chicken lobsters in chicken lobster cages in May next year, and completely catching the eels in the rice field in late June when breeding of the chicken lobsters is completed. According to the method, the eels, the chicken lobsters and the rice are comprehensively planted and bred, and breeding in the rice field can be implemented all year round.

The invention relates to the technical field of crayfish farming and discloses a capture device for farming crayfish in a rice field in the south China. The capture device comprises a transfer mechanism and a capture mechanism, wherein the transfer mechanism comprises a base; the upper end of the base is fixedly connected with a fixed box; two through holes are symmetrically formed in the upper end of the fixed box; the inside of each through hole is rotationally connected with a rotating screw through a ball bearing; the upper end of each rotating screw is in threaded connection with a lifting screw cylinder; and the upper ends of two lifting screw cylinders are fixedly connected with a same support frame. The capture device for farming the crayfish in the rice field in the south China has the advantages that the capture device can quickly capture the crayfish and is suitable for the position, which is difficult to capture, namely the rice field for capturing the crayfish.

The invention discloses a seawater shrimp pond ecological farming method. The seawater shrimp pond ecological farming method comprises following steps: 1) establishment of sea water ponds; 2) influent water treatment; 3) cleaning and bait organism culture; 4) selection and cultivation of early larvae; 5) feed selection and controllable bait feeding technique; 5) stability of water quality which improves purification capacity in pond water. The seawater shrimp pond ecological farming method has the advantages that the stability of water bodies, the acceleration of material circulation in water bodies and energy flow velocity are maintained, which improve the production stability, controllability, shrimp farming yield and success rate of breeding.

The invention discloses a multi-crop greenhouse sea shrimp farming method. The method includes steps of 1) farming base preparation; 2) farming previous preparation 3) broodstock purchasing and growing; 4) broodstock pond division; 5) product shrimp growing. The method provided by the invention has beneficial effects that the farming facilities are utilized in the maximal degree by adopting grading farming; prawn virus disease or other diseases are prevented effectively by closed farming implemented through a small-scale artificial biological system with water quality regulation employing comprehensive means; farming risks are reduced effectively by shortening the farming period to a time range within 90 days and ensuring product specification not smaller than 80 per kg by insisting whole-range use of good quality complete formula feed instead of living baits; and whole year farming yield is increased through whole year cyclic farming implemented through synchronous production of growing ponds and cultivation ponds.

The invention discloses a method for automatically spraying a fish feed based on an unmanned aerial vehicle and relates to the unmanned aerial vehicle technology field. The unmanned aerial vehicle anda ground station are included. The unmanned aerial vehicle includes a flight mode module, a fish feed release module, a data receiving module and a height detection module. The ground station includes a time sharing module, a route automatic planning module and a data communication module. By using the method for automatically spraying the fish feed based on the unmanned aerial vehicle, accordingto the shape and the position of a fishpond, the optimum route and the release place of fish feed release are automatically planned; according to set release time, the release is automatically completed; and manual supervision and feeding are greatly reduced and fish and shrimp farming is convenient.

The invention provides a fishing light complementation system with a microporous aeration device. 'Fishery-solar hybrid' refers to a combination of fishery farming and photovoltaic power generation, aphotovoltaic panel array is installed above the water surface of a fish pond, water below the photovoltaic panels can be used for fish and shrimp farming, the photovoltaic array can also provide a good shielding effect for the fish farming, and then a new mode , i.e., the power generation and the fish farming are respectively performed at the upper part and the lower part, of power generation isformed. However, a 'fishery-solar hybrid' farming model often does not fully consider an oxygen supply problem in the pond, and when the oxygen content in aquaculture water is insufficient, economic losses occur because of problems such as reduced vitality or even death of cultured objects exist. In view of the problems, the invention provides the fishing light complementation system with the microporous aeration device, and the microporous aeration device is additionally disposed below a photovoltaic component floating on the water surface, so the oxygen content in the aquaculture water is effectively improved, culture environment is improved, and health of the farmed objects is guaranteed.

The invention relates to a method for planting sea vegetables by using sea shrimp farming wastewater in a tidal-flat region. The method makes use of wastewater generated in conventional seawater shrimp farming in the tidal-flat region. The method includes the following steps that 1, a land is selected near a shrimp pond used for seawater sea shrimp farming, the land is deeply ploughed, weeds are removed, and soil preparation and bedding are conducted; 2, in April, flood irrigation of the sea shrimp farming wastewater is conducted on beds, sowing is conducted, and the sea shrimp farming wastewater is used for irrigation; 3, in May and June, flood irrigation of the wastewater is conducted on a trench between each two adjacent beds; 4, in July and August, flood irrigation of the wastewater is conducted on the trench between each two adjacent beds; 5, in September, flood irrigation of the wastewater is conducted on the trench between each two adjacent beds; 6, in October and November, harvesting is conducted. The method for planting sea vegetables by using sea shrimp farming wastewater in the tidal-flat region is provided, the wastewater generated by the shrimp pond built in the tidal-flat region for conventional seawater shrimp farming is made use of, the utilization rate of wastewater is improved, green treatment is achieved, operation is feasible, and the cost is low.

The invention discloses a rice-crayfish-rana nigromaculata comprehensive planting and breeding method which comprises the following steps of selecting a proper rice field, building a heightened and widened ridge around the rice field, and installing escape-proof facilities around the ridge; from January to February, selecting submerged plants as aquatic plants to be transplanted 15-20 days before crayfish fries are put; stocking the crayfish fries in February, and catching the crayfishes in turns to come into the market in April to June when the bred crayfishes reach the commercial specification; after the crayfishes are caught, starting to plant rice from late June to early July, wherein the rice variety is selected from varieties which do not need land airing; stocking rana nigromaculata froglets which are artificially domesticated and can eat commercial artificial compound feed in the rice field 7-10 days after rice seedlings are transplanted in the rice field, and from October to November, using ground cages for catching the rana nigromaculata which is bred to the commercial specification to come into the market in turns. According to the comprehensive planting and breeding method, ditches do not need to be dug, the rice field planting area is not reduced, the advantages of continuous cropping of the rice and the crayfishes and symbiosis of the rice, the rana nigromaculata and the crayfishes are played, the time and space of the rice field are fully utilized, and the rice field utilization rate and economic benefits are improved.

The invention provides a sealed water circulation method and device for prawn farming. The method comprises the following steps: 1, farming prawns in a prawn farming pond, and at the same time, culturing microalgae; 2, enabling farming water discharged from the prawn farming pond to flow into a flocculation treatment pond, performing porous adsorption treatment, and performing aeration stirring and mixing; 3, discharging a water body in the flocculation treatment pond into a settling pond, and at the same time, casting cages with larvae of fairy shrimps into the settling pond; and 4, enablingtreatment water discharged from the settling pond to flow into a biological treatment pond, performing treatment so as to obtain clean circulation water, and discharging the circulation water back into the prawn farming pond for farming prawns. By adopting the method and device, the microalgae are cultured in the prawn farming pond, and the microalgae and residual feeds are recycled and treated through the fairy shrimps, so that wastewater is treated through an ecological chain, the prawn farming cost can be reduced, and zero emission to the environment can be achieved.

The invention discloses a hang-culturing high-density ecological shrimp cultivating and water purifying device, comprising a floating frame. The hang-culturing high-density ecological shrimp cultivating and water purifying device is characterized in that the floating frame consists of a plurality of traverse floating pipes arranged at intervals and longitudinal floating pipes connected at both ends of the traverse floating pipes by tee joints or elbows, a water inflow control valve and a water discharge control valve are connected to the traverse floating pipes or the longitudinal floating pipes, baskets and hanging nets are arranged between the traverse floating pipes arranged at intervals, basket hanging rods with hooks on both ends are arranged on two sides of the upper end of the baskets in the oblong shape, the baskets are arranged between the traverse floating pipes arranged at intervals through the hooks on both ends of the basket hanging rods on the baskets, and the hooks and the traverse floating pipes are fixedly connected by the binding of flexible ribbons; the hanging nets are formed by hanging net hanging rods with hooks on both ends and flexible net pieces with the upper ends strung on the hanging net hanging rods; and the hanging nets are placed between the traverse floating pipes arranged at intervals through the hooks on both ends of the hanging net hanging rods, and the hooks and the traverse floating pipes are fixedly connected by the binding of flexible ribbons. The invention can be used for enhancing the shrimp cultivating density and purifying water bodies polluted by cultivation.

The invention discloses a multi-dimensional comprehensive utilization method for seawater. The seawater is taken, a traveling route of the seawater is formulated according to terrains and the fallingcondition of each aquaculture and halogen making pool, a gate is utilized for control in each different link, salinity of the seawater is increased step by step in a one-step one-control mode, the seawater is comprehensively utilized in a gradient manner with seawater salinity as the boundary, and the method comprises following links: seawater taking, adoption of a bacteria, algae and biological control method, original ecological culture of shrimps, bromine extraction, nano oxygenation, fairy shrimp farming, high-quality shrimp farming, dunaliella salina culture, salt production and recombination and blending of purified residual water. The method is the product adaptive to localized original ecological culture, sufficiently shows nature and utilizes beauty of natural laws, and realizes reasonable utilization of resources, and the novel production mode integrating fish, salt and bromine product is safe, efficient and eco-friendly, achieves multipurpose effect of the seawater, is cyclic and achieves the win-win purpose of social, ecological and economic benefits.

The invention belongs to the field of aquaculture and specifically relates to a method for ecologically breeding macrobrachium rosenbergii by growing grass in a pond. The method comprises the following steps: (1) pond selection and reconstruction: making the area of a grass growing and shrimp farming pond be 6-10 mu, keeping the grass growing and shrimp farming pond rectangular, long in a direction from the east to the west and wide in a direction from the south to the north, and keeping the length-to-width ratio at 2:1; (2) initial fry putting and grass growing: keeping the water depth of thepond at 70-80 cm, putting fries into the pond, then, adding new water every other 3-5 days while breeding until a water surface exceeds a grass growing platform and the water depth is 1-1.2 m when the breeding lasts for 25-30 days, growing grass plants in a single row in the center of the grass growing platform; (3) aeration in middle and later periods: starting an aerator for 1-2 h in the noon of a sunny day to promote the convection and uniform mixing of an upper water layer and a lower water layer; and (4) catching: catching large shrimps and remaining shrimps in time after the relativelylarge shrimps reach a specification meeting a market requirement. The grass reasonably grows in the pond, so that an absorption and conversion path of breeding object excrements is increased, the loadof a water body is reduced, and the water exchange quantity is reduced; and a concealing and hiding safety place is provided for molting shrimps, so that the molting shrimps eaten by the same kind are reduced, and the breeding survival rate is increased.

The invention discloses an aerator for crayfish farming. The aerator comprises a mounting groove and a controller, a floating plate is arranged at the bottom of the mounting groove, the two sides of the inner side of the floating plate are sleeved with gas-liquid turbulence assemblies, floating boats connected with each other are arranged at the tops of the two sides of the mounting groove, a mounting bin is arranged at the top of the mounting groove, double-shaft motors are arranged on the two sides of the bottom in the mounting bin, and transmission shafts are arranged at the output ends ofthe double-shaft motors. Through mutual cooperation of the gas-liquid turbulence assemblies, auxiliary oxygenation work can be formed, meanwhile, water liquid below the aerator is promoted to be turbulent, the flow direction of the water liquid is diffused and made to be consistent with the rotating flow direction of an impeller and blades, the phenomenon that dissolved oxygen water liquid flows back is prevented, an arc-shaped guide sleeve, an arc-shaped damping column and a buffer spring are connected and matched, so that the floating buffering and damping capacity of the floating plate is improved, and the operation stability of the aerator and the comprehensiveness of water and oxygen dissolution are improved.

The invention discloses a crayfish sorting device. According to the crayfish sorting device, the problems that when existing crayfish farmers sort crayfishes, the crayfish sorting device is greatly influenced by experience of farmers, the sorting time is long, the sorting speed is low, and the workload of the farmers is heavy can be solved. According to the technical scheme, the crayfish sorting device comprises a sorting plate and a bottom plate, a sliding groove is formed in the outer wall of the sorting plate, the inner wall of the sliding groove is in sliding connection with a first sliding block and a second sliding block, the outer wall of one side of the first sliding block is connected with a rotating shaft through a bearing, the outer wall of the rotating shaft is connected with asorting roller through a key, and an auxiliary screening mechanism is fixed to the outer wall of the sorting roller through screws. According to the crayfish sorting device, a threaded rod is rotatedto drive a base block to move, then a belt is tightened to drive the first sliding block and the second sliding block to slide inwards on the inner wall of the sorting plate, the distance between thesorting rollers is decreased, and the threaded rod is reversely rotated to increase the distance between the sorting rollers so that farmers can sell crayfishes in a classified mode according to thesizes of the crayfishes, operation is easy and convenient, labor is saved, and sorting efficiency is improved.

The invention discloses a method of farming black shrimps in a lotus root pond. The method comprises the steps of paving a stainless steel wire mesh, a gravel layer, a quartz sand layer, a dirt bed, a fertilizer layer and a mud layer at the bottom of a culture pond; planting lotus root seeds in the mud layer; pumping out water in the culture pond, and pumping clean water into the culture pond; putting young black shrimps into the culture pond; putting shrimp feed with 1mm-grain size into the culture pond three times a day during the first to the second month of black shrimp putting; putting the shrimp feed with 3mm-grain size into the culture pond four times a day during the third month to the fifth month of black shrimp putting; putting the shrimp feed with 3mm-grain size into the culture pond five times a day during the sixth month of black shrimp putting. According to the method provided by the invention, the black shrimp farming and the lotus root farming are combined, the use ratio of the culture pond is improved, and compared with separate farming, the usage amounts of a fertilizer and the feed are greatly saved, and by utilizing the method disclosed by the invention, the cultured lotus roots are fertile, white and tender, and fragrant and sweet in mouthfeel, moreover, the black shrimps are rich in nutrition and delicious in taste.