388 results about "Zooplankton" patented technology

At first, breeding filter feed silver carp, carp and crucian carp in area of water bloom breakout to control algae growing; pelagian eats small algae to reduce quantity of the algae; spiral shell and clam can moves carrying roes toincrease fish spreading area; cyanophage, dissolved algae bacteria and other microbe eating algae are separated and purified from natural water, which is cultured to large quantities in laboratory then to be put in blue algae water bloom breakout orea to control algae; resumption of water plant in water bloom breakout area can control algae growing. Last is getting rid of algae by machine including fixed blue adgae water bloom removing machine and mobile blue adgae water bloom removing machine.

The invention relates to a benthonic animal-algae-aquatic plant-fish based river water ecological environment self-remediation method. The method is to overcome problems of river water ecological environment remediation methods at present, namely short effect duration, high costs and easy generation of secondary pollution. The method includes 1) evaluating the degree of pollution of a river, 2) planting reed and seeding algae, 3) throwing in plankton and benthic mollusks, 4) planting submerged plants, 5) throwing in shrimps, herbivorous fishes, omnivore fishes and filter-feeding fishes, 6) throwing in carnivorous fishes, and 7) harvesting the reed and the submerged plants before the reed and the submerged plants die, catching the benthic mollusks and the shrimps, and catching the fishes after two years. The method is long in effect duration, low in cost and free of secondary pollution and is applied for the field of river water pollution remediation.

The invention discloses a method for establishing an urban landscape water body ecological system. The method comprises the following steps: improving a water body substrate; planting submerged plants by using a method that upright posts are adopted to mark areas, so as to establish an underwater frost; planting layered emergent aquatic plants; putting zooplankton (daphnia magna) so as to improve the transparency of the water body; putting aquatic organisms such as fishes, shrimps and shells, so as to complete the water body ecological system; maintaining and managing the ecological system. Through the adoption of the method, the quality of the water body can be remarkably improved, the transparency can be greater than 2.0m, the quality can meet the III-type water quality standard for a long time, black, smell and dirty water bodies with blue-green algae can be thoroughly eliminated, and the water body is always kept clear completely.

An efficient organic fertilizer for aquatic culture is prepared from monoammonium (or biammonium) phosphate, peat and trace elements through proportioning, pulverizing and mixing. It can be used to culture the phytoplankton, zooplankton and useful algae, which can be used as biological feed, and prevent disease of fish.

An efficient inorganic fertilizer for aquatic culture is prepared from monoammonium (biammonium) phosphate, ammonium chloride or urea, and trace elements through proportioning, pulverizing and mixing. It can be used to culture the phytoplankton, zooplankton and useful algae, which can be used as biological feed.

The invention relates to an artificial shallow sea ecosystem marine ranch. The marine ranch is an ecological bionic project artificially imitating a natural upwelling fishery and a shallow continental shelf ecosystem fishery. With an artificially induced upwelling marine ranch device, nutrient-salt-rich deep sea water is induced to lift to a euphotic zone. Nutrient salt sinking is prevented with an artificial hallow continental shelf ecosystem marine ranch device. A huge well-conditioned place is provided for the growth, reproduction, spawning, feeding, hiding, inhabitation and activity of various marine lives. Coordination and cooperation of light, heat, water, fertilizer, bait, oxygen and space resources are realized. Solar energy is absorbed and converted into biomass energy; carbon dioxide is absorbed and reduced into phytoplankton; and through the marine ecosystem food chain and food web, phytoplankton is converted into zooplankton and economic animals such as fish, shrimp, crab, shell, sea cucumber, squid and the like. After catching and processing, seafood such as fish meat, fishmeal and fish oil can be produced. The seafood fish meat can be adopted as a food; the fishmeal can be adopted as a feed; and the fish oil can be processed into food or into biodiesel as an energy. With the marine ranch, in the sea euphotic zone, solar energy is converted into food and energy.

The invention relates to a method for realizing ecological larval culture on rapana venosa. The method is characterized by comprising the following steps of: firstly selecting a pond which is convenient in water exchange, takes lithoherm and stone bottom as a substrate and is in the size of 2-5Mu; then placing mature rapana venosa with the length of 7-10cm into the pond in the quantity of 100kg per Mu, mating and spawning after the rapana venosa eats ruditapes and mussel for 2-3 days, when enough oocysts are obtained, removing the rapana venosa away, incubating the oocysts for 20-22 days at the water temperature of 20-25 DEG C to obtain planktonic larva, growing the planktonic larva by eating the planktonic larva in the pond, starting to throwing polyethylene corrugated plate adherence ortile under the condition that the water temperature is 22-25 DEG C after 15-16 days, sticking benthic diatom and the planktonic larva onto the polyethylene corrugated plate or tile, transfigurating the planktonic larva of the rapana venosa into young spiral shell after 5-6 days, growing the transfigurated young spiral shell by eating the planktonic larva and benthic diatom on the corrugated plate, wherein the survival rate of the transfigurated young spiral shell on the corrugated plate can reach more than 50%, and feeding small low-value bivalve to the young spiral shell with the length morethan or equal to 3mm. By applying the method provided by the invention, the defects that the survival rate is low and the larval yield is low as bait conversion is difficult and water is polluted when carnivorous fish mice are used as feed in indoor artificial larval culture can be overcome, and the larval yield is improved by more than 50% compared with the indoor artificial larval culture. Meanwhile, the production cost is saved as no bait is thrown into the pond, thus the method is environment-friendly, and the produced larval is strong.

The invention discloses a plant alga, zooplankton and fish automatic culture integrated device. Zooplankton, plant algae and fishes are separated through micro-filtration membranes for integrated culture, the food chain unbalance problem existing in polyculture is avoided, and convenience is brought to use; oxygen and carbon dioxide are mutually communicated to meet survival conditions required by internal animals and plants. Water resources are saved by means of a water circulation filtering mode, and a sterilizer in a water circulation module can be used for disinfection and sterilization to guarantee water quality. A magnetizer can convert large molecules into small molecules, water molecules can permeate the micro-filtration membranes more quickly, and the high content of dissolved oxygen in magnetized water makes the survival rate and quality of the animals and the plants improved. Excrement of the zooplankton and the fishes is collected and fermented and then serves as fertilizer of the plant algae for circulation, and the excrement is independently fermented to prevent water from being polluted and meanwhile can be absorbed and used by the plant algae more easily.

The invention discloses a method for realizing ecological aquaculture method by regulating the water quality of a high-yield aquaculture pond. The method integrates micropore oxygen increasing technology, a fish and vegetable co-existing technology and a water quality regulation micro-ecological agent using technology, so that the water quality of the high-yield aquaculture pond can be improved substantially, the water transparency can be improved, total ammonia nitrogen, nitrite nitrogen, total phosphorus and total nitrogen in water can be reduced, the pH of water can be stabilized, the density of blue algae, green algae and euglena which are harmful to aquaculture can be reduced obviously, diatom, dinoflagellate and cryptomonad which can serve as bait are not influenced obviously, an experimental pond is relatively stable in the aspect of zooplankton, accordingly, micro-ecological balance of the aquaculture water can be improved and stabilized, the yield can be increased, the earnings can be increased for a farmer, and the method can be widely applied to ecological breeding of various types of aquatic animals and plants.

The invention discloses a method for separating dominant rotifers and co-culturing the dominant rotifer and chlorella vulgaris in an O3 / BAC (biological activated carbon) advanced treatment process, which comprises the following steps of: a. determining the rotifers in the O3 / BAC advanced treatment process: researching population structures of planktonic animals in various process flows of waterplant ozone activated carbon advanced wastewater treatment, sampling and respectively quantitatively and qualitatively analyzing; b. separating the dominant rotifers in the O3 / BAC advanced treatment process: acclimating in dark at room temperature over night, picking up health and lively adults by using a dropper for further culturing; c. culturing the chlorella vulgaris: grafting purified single chlorella vulgaris in a Blue-Green Medium culture solution; d. carrying out adaptability on the rotifers: directly grafting the rotifers with the initial grafting density of 10-30 / L in the cultured chlorella vulgaris solution; e. co-culturing: co-culturing according to the initial grafting density of the rotifers; and f. subcultring: if the rotifers in a culturing system is dead, transiting the rotifers for subcultring. Co-culturing the dominant rotifers indoors for a longer time in the O3 / BAC advanced treatment process is realized, and the density of the rotifers is maintained at 400-600 ind / ml. Particularly, experimental material is provided for safety control and risk assessment research of the rotifers in life drinking water.

The invention relates to a method for improving water quality of a steep-slope river by drop-aeration. The invention comprises the following steps: driving wood piles at two sides of a river channel, backfilling a mixture of crushed stones and soil into a riverbed between a revetment and the piles, covering vegetation to form a plant platform, pouring a trapezoid concrete pier across the river channel to form a overflow weir, and stacking block stones on the overflow weir, wherein the block stones are divided into two sides; the side with higher block stones has small gaps, and the side with lower block stones has large gaps. The invention solves the defects that existing river treatment method results in the loss of deep pools and shoals in natural rivers; primary producers such as various phytoplankton and zooplankton can not reproduce; and benthic and large animals which eat them can not inhabit the river. The invention has low cost, and good permeability, can provide aquatic animals and plants with habitat space, can form a multi-flow changing zone, a multi-organism growing zone, and a multi-fish hideout, has good drop-aeration effect, and can reduce soil loss.

The invention relates to a method for restoring a river / lake water system by biological chain construction technology, which is implemented by constructing a biological chain system in a river / lake water system, wherein the biological chain system is composed of submerged plants, emerging plants, floating plants, floating leaf plants, aquatic animals and zooplankton. The method avoids disturbance and damage of physical or chemical technology to the water body, and is suitable for a river / lake water body with a damaged or unsound water system ecological structure. The river / lake water body treated by the biological chain construction technology is close to the natural water body; and the ecological function is gradually recovered, and the self-purification capacity is gradually improved. In addition, the method is simple to operate, has the advantages of investment saving and no pollution, and does not occupy the extra space except the river / lake water body, thereby saving the land.

An artificial culture and domestication method for a fingerling of Hucho taimen relates to the aquatic product culturing field which solves the problem that the current culturing technology is not suitable for the fingerling of Hucho taimen and can be finished by the following four phases: 1. cleaning a hatching slot 2 to 10 times a day and picking out dead eggs, dead fingerling and egg skin; 2. feeding zooplanktons for 4 to 7 days and 6 to 8 times one day; 3. feeding the zooplanktons and water earthworms for the first 3 to 5 days; then feeding the water earthworms for 4 to 5 times a day for the next one week; then feeding massive materials once every morning for three weeks and feeding the water earthworms in the daytime and at night for 4 to 5 times a day; 4. feeding artificial feedstock in the morning and massive materials in the daytime for 2 to 3 times a day and the water earthworms at night during the first 2 to 3 weeks; and feeding the artificial feedstock for 3 to 4 times a day by every 2.5 to 3 hours for one time and feeding the water earthworms at night after the next 2 to 4 weeks; feeding the artificial feedstock four times a day for the last 15 days and finishing the domestication work. The domestication method of the invention has the advantages of simple and convenient operation, low cost and good domestication fingerling quality.

The invention discloses a green geo-engineering system device for regulating global climate change. The device is engineering for artificially simulating a natural upwelling fishery and a continental shelf shallow sea ecosystem fishery; deep nutritive salt-rich seawater is induced to upwell to a marine euphotic layer by utilizing an artificial induction upwelling marine ranching device; nutritive salt is prevented from sinking by utilizing an artificial shallow sea ecosystem marine ranching device; coordination of photo-thermal water and fertilizer resources is realized; sunlight energy is absorbed and is converted into biomass energy; carbon dioxide is absorbed and is recovered into phytoplankton; the concentration of atmospheric carbon dioxide is regulated; the global climate change is regulated; the phytoplankton is converted into zooplankton and economic animals such as fish, shrimps, crabs, shellfish, sea cucumbers and squids through a food chain and a food web of a marine ecosystem; seafood, fish meat, fish meal and fish oil are produced by catching, the fish meat serves as food, the fish meal serves as a feed, the fish oil can be processed into the food and can also be processed into biodiesel serving as energy, and the sunlight energy and the carbon dioxide are finally converted into the food and the energy on the broad marine euphotic layer.

The invention discloses an artificial cultivation and domestication method of salvelinus leucomaenis fries, belonging to a cultivation method of fish fries, in particular to a cultivation method of salvelinus leucomaenis fries, and solving the problems of death, difficult domestication, low domestication rate and difficult artificial feed intake of the salvelinus leucomaenis fries because the salvelinus leucomaenis fries are only fed by the tubificidaes and can not take comprehensive nutrients in the cultivation and domestication process by adopting the traditional fry cultivation method. The artificial cultivation and domestication method of the salvelinus leucomaenis fries is sequentially divided into an incubation management stage, a zooplankton feeding stage, a zooplankton and tubificidae mixed feeding stage, a tubificidae feeding stage, a tubificidae and artificial feed mixed feeding stage and an artificial feed feeding stage. The method has the advantages of simple and convenient operation and low cost and ensures that the quality of the domesticated fries is good and the survival rate of artificially domesticated fries is improved to 79 percent from initial 20 percent, thus the method can be used for cultivating the salvelinus leucomaenis fries.

The invention discloses a leech fry, snail and aquatic plant commensalism intermediate breeding method and belongs to the technical field of aquaculture. According to the method, an ecotype leech fry commensalism breeding system is built, small snails and / or zooplanktons and / or nutrients are adopted as fodder of young leeches, the breeding system is stabilized through the purification capacity of aquatic plants, deterioration of water quality is avoided, the young leeches obtain rich nutrition through composite collocation and application of small snails, zooplanktons and nutrients, leech fries are good in activity, rapid in growth and low in casualty rate, the situation that as young leeches live in groups and climb to be groups seriously, serious death is caused when the young leeches can not obtain fodder is avoided, the rate of survival is improved in the leech fry breeding stage, the method is simple in process, technical feasibility is achieved, breeding enterprises and farmers can use the method conveniently, the technical advantages of maintaining good and stable breeding environment, reducing the risks of leech fry death and the like are achieved, and the method has wide application prospects in the field of national leech breeding.

The invention relates to a method for treatment sewage, in particular to a method for effectively treating sewage by using both microbial cells and enzyme preparations, aiming at solving the problem of sewage treatment. The method comprises the following steps: treating the sewage by using photosynthetic bacteria, lactic acid bacteria, yeast bacteria, cellulase, papain, amylase and lipase for 20-30 days to obviously improve water bodies, then immediately restoring the biologic chains of the water bodies, putting submerged plants comprising waterweeds and the like, phytoplankton, pet fishes and shrimps, planktonic animals and the like in the water bodies for breeding, and gradually stabilizing the water bodies to achieve new ecological balance and remove pollution. The microbial cells and enzymes are combined to take a synergic effect, and then various pollutants can be thoroughly eliminated by the functions of the enzymes in the early decomposition and digestion of the microbial cells.

The invention provides a rapid cultivation device and method of a daphnia magna laboratory and belongs to the field of cultivation of zooplankter. The rapid cultivation device comprises supports, base plates, water bath tanks, a water storage tank, cultivation cups, heating rods, thermometers, turbulence pumps, a fluorescent lamp and a time controller. Each base plate is arranged at the bottom of the corresponding support. The storage water tank is arranged on the base plate of the bottommost support. The water bath tanks are arranged on the base plates of the two upper supports. One thermometer, one turbulence pump and two heating rods are arranged in the water storage tank. Each water bath tank is provided with one thermometer, two heating rods and six cultivation cups. The fluorescent lamp is located above the portion deviating from the center of the support and is parallel to the support. The time controller is in contact with the fluorescent lamp. The rapid cultivation device is easy and convenient to operate, high in operability, easy to set up and free of a complicated device structure. Daphnia magna cultivated through the rapid cultivation device is rapid in reproduction and large in quantity, the life condition of the daphnia magna is stable, and the individual difference of the daphnia magna is small, so that results of toxic tests of fleas are stable and reliable, the test quality is guaranteed, and enough test materials can be provided for tests such as removal of zooplankter pollution to water in the industry of water treatment at the same time.

The invention discloses a full-automatic factory pond multi-layer classified cultivation technology. The pond single-layered polyculture is transformed into the multi-layered classified single-culture, so that independent perfect nests with different levels, different temperatures, different amount of dissolved oxygen, separated bait and excrement, and comfortable environments are respectively provided for cultivated targets of different specifications and different varieties, layered and classified independent cultivation environments with appropriate conditions are respectively provided for phytoplankton, zooplankton, fishes, shrimps, crabs, ginseng and shellfish; the illumination, temperature, dissolved oxygen, nutrient salt, carbon dioxide, pH value and transparency of various layers can be adjusted and controlled at any time, so that an optimal growth environment can be provided for cultivated targets; the functions of running water cultivation, microalgae culture, zooplankton culture, fish culture, shrimp and crab cultivation, shellfish bottom sowing culture, net cage cultivation, autologous water circulation, autologous fertilizer circulation and the like are integrated into a whole; therefore, a modern high-yield, efficient, low-carbon, low-consumption, energy-saving, environment-friendly, water-saving, power-saving, ecological, organic, healthy, one-click managed full-automatic factory pond multi-layered classified cultivation comprehensive management and control system can be realized.

The invention relates to the field of pollution control of water environments. Aiming at the problem of low self-cleaning capability of a landscape lake, the invention provides a construction method of a water ecological system of the landscape lake. The method comprises the following steps of S1, pretreatment of lake water: putting microbes and zooplanktons into the lake water; S2, construction of an aquatic plant system: planting aquatic plants; S3, construction of an aquatic animal system: after the planting of the aquatic plants is completed, putting aquatic animals into the lake water; and S4, later-stage maintenance: regularly harvesting the aquatic plants and catching the aquatic animals. Firstly, the microbes and the zooplanktons are added into the lake water, and the microbes adsorb and decompose organic substances in the lake water, so that nutrient substances such as ammonia, nitrogen and phosphorus in water can be favorably reduced, and water body transparency is improved;the zooplanktons are favorable for the decomposition of blue-green algae in the lake water; a better environment is favorably provided for the growth of the aquatic plants; the survival rate of the aquatic plants is favorably improved; and the self-repairing capability and self-purification capability of a water body are enhanced.

The invention relates to a device for catching planktons, comprising nets and a collector case. The collector case is made of screen net and takes the shape of a case with four walls, a closed bottom and an open top; one side of the peripheral wall of the collector case is cut with an opening, the outer side of which is connected with two nets made of screen net and forming certain angle. The top parts of the nets and the collector case are both provided with a supporting object which ensures the net and the collector case to float and be fixed in place. The invention makes use of water flow generator to push planktons in water into the two nets and sends the planktons into the collector case by the joint function of the water flow and the nets. The planktons are further concentrated in the collector case and workers can fish out the planktons which can be used in feeding aquatic fishes after being packed and transported in the collector case with a small fishing net, realizing the induction, pushing, collecting and fishing of planktons in natural waters or large artificial culture pond.

The invention relates to a method for removing algae by series connection of zooplankton and filter-feeding fish, which relates to a method for controlling the removal of algae in eutrophic water. The invention can solve the problem that the algae in natural water can not be completely removed by utilizing aquatic organisms. The method of the invention is that first, at least two sluice facilities are connected with each other in series; then, the algae-containing water sequentially flows through every sluice facility; the hydraulic retention time of every sluice facility is one to three days; the zooplankton and the filter-feeding fish are alternatively stocked in the two neighboring sluice facilities; the stocked zooplankton are mainly daphnia magna which eats micro algae; at the same time, all the fishes in the sluice facility which stocks the zooplankton are completely cleaned out or predatory fishes are threw in; the stocked fishes in the sluice facility which stocks filter-feeding fishes are silver carp and bighead carp or only the silver carp is stocked. The stocking density of the silver carp is 40 to 200g / m<3>; every single silver carp weighs 60 to 500 grams; the stocking density ratio of the bighead carp and the silver carp is 1:3 to 1:5; every single bighead carp weighs 60 to 500 grams. The method of the invention can completely remove the algae in the natural water.

The invention discloses a culture apparatus for zooplankton, comprising a culture part arranged on the upper side and with two opening ends, and a washing part arranged below the culture part and with two opening ends; the invention is characterized in that: the opening at the lower end of the culture part is selectively connected with the opening at the upper end of the washing part through a valve, the culture part and the washing part form the whole cylinder. The whole zooplankton culture apparatus has the advantage of relatively reduced volume, and ability to be moved, for that the culture box (culture part) and the water quality regulating box (washing part) are integrated into a tube-shaped whole upper part and lower part, which are connected with each other through a valve.

The invention relates to a culture method for phytoplankton, belonging to the field of breeding. The invention discloses a method for culturing phytoplankton with predominant chlorophyta, comprising the following steps of: (1) producing culture solution, namely selecting cleaned aquatic plants with low cellulose content at first, and then adding a proper amount of water in the aquatic plants and placing the aquatic plants in a light-tight and warm environment to rot and ferment, and finally filtering the rotted and fermented solution of the aquatic plants to obtain the culture solution rich in nutrient elements such as nitrogen and phosphorus; (2) obtaining a natural eutrophic water body in late spring and early summer; (3) filtering large zooplankton and large individuals of phytoplankton in the obtained water body by a 200-mesh plankton mesh; (4) adding the culture solution produced in the step 1 in the water body filtered by the plankton mesh; and (5) culturing the culture water body with the culture solution in a transparent glass bottle at natural temperature under natural light, thus obtaining phytoplankton with predominant chlorophyta.

The invention relates to an artificial cultivation and domestication method of American shad fry and fingerlings, which optimizes the soil pond artificial cultivation steps through the measures of controlling water quality and baits in a soil pond, putting the fry in the pond as early as possible, carrying out special treatment on the baits for domestication and feeding and the like, thereby avoiding the death of American shads under stress to the maximum extent, greatly reducing the labor intensity, significantly improving the growth speed and having the advantages of simple operation, low cost, good domestication fry and fingerlings and the like. The artificial cultivation and domestication method comprises the following four steps: 1, biological cultivation and incubation management ofthe baits in the pond; 2, feeding with zooplankton; 3, feeding with special feeds, which is divided into two rearing stages: the feeding with the zooplankton is reduced and the feeding with the special feeds is simultaneously carried out in the first stage and only the feeding with the special feeds is carried out in the second stage; and 4, feeding with artificial expanded feeds, which is also divided into two rearing stages: the feeding with the special feeds is reduced and the feeding with the artificial expanded feeds is simultaneously carried out in the first stage and only the feeding with the artificial expanded feeds is carried out in the second stage.

The invention relates to a combined biomanipulation method for water-area ecological restoration. The combined biomanipulation method includes the steps that growth of phytoplankton in a system serves as starting; zooplankton is transplanted to the water body, and algae in the water body are controlled; aquatic vegetation is planted; after aquatic plants successfully grow, freshwater shrimps, caridina, small fishes, small carnivorous fishes, large carnivorous fishes and molluscs start to be put. By means of the combined biomanipulation method, all the key technologies in biomanipulation are integrated, food chains in the water-area ecological system are entirely and systematically rebuilt, the complexity of biocenosises is prolonged and improved, the stability of the system is improved, and the fixing function and the nutriment circulation function of the system are achieved.

The invention belongs to the technical field of aquatic product ecological breeding, and particularly relates to a method for ecologically breeding litopenaeus vannamei by replacing part of feeds withliving baits. The method is characterized by comprising the steps of (1) applying fermented dung to the bottom of a pond as a base fertilizer, wherein water intake depth is 60-80cm before litopenaeusvannamei fries are put, and performing disinfection treatment; (2) putting litopenaeus vannamei fries: applying composite microorganism preparations, putting the litopenaeus vannamei fires at the peak period of rotifers, and after 15 days of putting the litopenaeus vannamei fries, putting grass carps; (3) after 30-90 days after putting the litopenaeus vannamei fries, maintaining biomass in the pond to be sufficient, and maintaining bred animals, zooplankton and phytoplankton balanced; and (4) collecting litopenaeus vannamei: continuing breeding the litopenaeus vannamei for 30 days, mainly feeding compound feeds, enabling the shred litopenaeus vannamei to eat biological baits as assistance, after the length of litopenaeus vannamei bodies is 15cm or above, inducing the litopenaeus vannameiwith feeds, and harvesting the litopenaeus vannamei. The method disclosed by the invention has the beneficial effects that more energy in ecological circulation can flow into bred products, ecologicalenvironment circulation is promoted, environmental pollution is reduced, feed feeding is reduced, and the cost can be reduced.

The invention discloses a composite prawn farming system based on ex-situ biofloc cultivation and in-situ nitrification, mainly comprising a prawn farming pond, a juvenile cultivation pond, a settlingpond, a denitrification pond, a fluidized bed and a microcomputer control system. In the juvenile cultivation phase, farming tail water is mainly treated through a biofloc technique; farming water nitrogen is mainly removed in the late farming stage through in-situ nitrification and denitrification; the harmful matters, such as hydrogen sulfide, occurring in the farming process are removed by theaid of the ex-situ biofloc technique; farming oxygen dissolution risk can be controlled, zooplankton is subjected to ex-situ cultivation by means of bioflocs to feed prawns, feed utilizations rate isincreased, and nutrition is balanced for the prawns. Compared with single biofloc prawn-farming systems, the composite prawn farming system herein has the advantages that aerating energy consumptionis decreased by 30% and above, food utilization rate can be increased by 10-15%, ammonia nitrogen and nitrite concentrations can be controlled within a safety concentration range in the whole farmingprocess, the farming risk is low, and the system herein is suitable for large-scale prawn production.