166 results about "Filter feeding" patented technology

The invention discloses a method for removing water eutrophication, which comprises the following steps of: investigating a community structure of aquatic organisms in water body, and finding a missing link or broken link in a food chain according to an investigation result; stocking predacious fishes in the water body, removing small trash fishes and herbivorous fishes from the water body by adopting a medicament mode or a manual fishing mode, and regulating the community structure of the fishes in the water body; planting submerged plants, floating plants and emergent aquatic plants in the water with the depth of 0 to 1.5m; and stocking filter-feeding fishes, filter-feeding shellfishes, detritus feeding benthonic animals and herbivorous fishes in the water body. The method for removing water eutrophication can realize the removal of the water eutrophication and ecological restoration for large-scale water body of which the parameters cannot be manually controlled, effectively inhibit the outburst of algal bloom and keep the stable quality of the water body.

The invention discloses a method for ecologically poly-culturing fishes with different feeding habits in net cages of a shrimp culture pond. A plurality of net cages are arranged in the shrimp culture pond; one or more omnivorous fishes, filter-feeding fishes and carnivorous fishes are put into the net cages; shrimps are put outside the net cages; the putting density of the shrimps is reduced; and the fishes and the shrimps are cultured in a separated manner by the net cages. The method can be used for culturing the fishes and shrimps in a separated manner, so that the shrimps are prevented from being preyed by the fishes, the fish baits are sufficiently utilized, and the catching is easy.

The invention relates to a prawn culture technique, in particular to a closed circulating seawater prawn pond culture system, which sequentially comprises a square or round culture pond, a round or square, corner-rounded vertical flow sedimentation pond, a comprehensive shellfish and algae treatment pond and a constructed mangrove wetland; the area of a single culture pond is 0.4 to 0.6 square meters, the culture pond consists of 2 to 3 prawn ponds, the pond depth is 2 to 2.2 meters, and the water depth is 1.6 to 1.8 meters; a circumferential inner wall (2) of the vertical flow sedimentation pond is inclined upwardly, the upper edge of the vertical flow sedimentation pond is provided with an annular water outlet channel (1) and a water outlet pipe (8), a mud-collecting pit (5) is arranged at the center of the bottom of the vertical flow sedimentation pond, and is connected to the outside of the pond through a mud discharge pipe (4), a central pipe (3) is arranged over the mud-collecting pit (5), and is supported and fixed by a support (6) at the center of the bottom of the vertical flow sedimentation pond, the lower part of the central pipe (3) is provided with a reflective plate (7), and a water inlet pipe (10) connected into the pond is extended into the lower part of the central pipe (3); the vertical flow sedimentation pond is 2.5 to 3 meters deep, and the water depth is 2 to 2.5 meters; the water depth of the comprehensive shellfish and algae treatment pond is 1.6 to 1.8 meters, and filter-feeding shellfish and algae are cultured in the pond by way of hanging; and the hydraulic power of the constructed mangrove wetland stays for 12 to 24 hours. In the culture system has the advantages that the polluting substances produced in the process of prawn culture can be fully and effectively removed, the structure is simple, the removing efficiency is high, the occupied floor area is small, energy can be saved, and emission can be reduced.

The invention relates to a culture pond, belongs to the field of pond culture engineering and provides a culture pond system capable of improving energy efficiency. The culture pond system is characterized in that predacious fish and filter-feeding and omnivorous fish are cultured in one pond separately, a flowing water culture pond area for culturing the predacious fish of different specifications is constructed on 20% of the water surface of the pond, and 80% of the water surface of the pond is a filter-feeding and omnivorous fish culture area; the flowing water culture pond area is composed of multiple rows of fish ponds arranged centralizedly, each row of fish ponds forms a culture unit via fish ponds of three specifications, and the fish ponds of the three specifications are a corner-cut square adult fish culture pond, a rectangular large-size fingerling culture pond and a small-size fingerling culture pond respectively; a water turbine is mounted on one side of the flowing water culture pond area, a surge disturbance machine is mounted at the water collection end of the flowing water culture pond area, and a sewage collection and discharge pipe is mounted on the outer side of each adult fish pond; partition walls are arranged in the middles of the flowing water culture pond area and the filter-feeding and omnivorous fish culture pond area, water flow passages are arranged on two sides of each partition wall, and the partition walls and guide walls arranged in the middle of the filter-feeding and omnivorous fish culture pond area guide water flow together.

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 comprehensive aquaculture device and a method based on a multi-trophic-level ecological ditch. An aquaculture pond is connected with a filter feeding type fish aquaculture area through a culvert pipe, the filter feeding type fish aquaculture area is connected with an emergent aquatic plant purification area through a water filtration partition, the emergent aquatic plant purification area is connected with a submerged plant purification area through a water filtration partition, a water filtration partition is arranged at the tail end of the submerged plant purification area, and a water pump is arranged inside each partition. The aquaculture method includes the steps that the step A, source water which is acquired on the rim and accords with fishery water quality standards is pumped into the aquaculture pond through automatic flow or a water pump; step B, the aquaculture mode of combination of high-density stocking and multiple stocking and multiple fishing is adopted; step C and step D, along with arrival of aquaculture seasons, an impeller type aerator and a water ploughing machine are arranged in the aquaculture pond; step E, fishes are stocked in the filter feeding type fish aquaculture area; step F, leakage and water evaporation are carried out, and standard source water is added into the aquaculture pond. By means of the comprehensive aquaculture device and the method based on the multi-trophic-level ecological ditch, structure is simple, aquaculture is convenient to operate, aquaculture yields are improved greatly, and water area environment is protected.

The invention discloses a multi-ecological niche bioremediation method of seawater aquiculture environment, which comprises the steps of draining aquiculture wastewater into an aquiculture trench, adding beneficial bacteria to remove nitrogen and phosphorous and convert organic matters on the first stage, culturing filter-feeding fishes and large-scale seaweed to form a multi-ecological niche biosphere coexisting microalgae, filter-feeding fishes and large-scale seaweed in the second stage, and allowing bioremediation of seawater aquiculture environment by utilizing different ecological niches of beneficial bacteria, microalgae, filter-feeding fishes and large-scale seaweed through synergic action of organisms. The inventive method can clean aquiculture wastewater to meet discharge standards, remediate aquiculture environment, and obtain fishes and large-scale seaweed, thereby bringing environmental, economic and ecological benefits.

The invention relates to a method for controlling cyanobacterial bloom, which is mainly characterized by throwing composite biological strains, trace elements and filter-feeding fishes into a water body so as to rapidly construct a beneficial bacteria-algae cycling system of the water body, fundamentally lower the eutrophication degree of the water body and and achieve the goal of thoroughly controlling the cyanobacterial bloom. The invention is suitable for the ecological management of various eutrophy water bodies and has simple operation, low cost, rapid management and obvious effect.

The invention discloses a method for treating aquaculture wastewater. The method comprises the following steps of: performing modular processing on wastewater by using microalgae and beneficial bacteria; and throwing snails, filter-feeding fishes and other aquatic animals into a water body to realize self-purification of an aquaculture water environment after the modular processing. Dominant and beneficial microalgae such as diatom, green algae and the like capable of absorbing nitrogen and phosphor in the aquaculture water body are screened out, inoculated, rapidly cultured and put into the aquaculture water body; the water color is regulated and the alga concentration is controlled by the methods of rational fertilization and rotifer inoculation; the beneficial bacteria are bacillus and photosynthetic bacteria capable of degrading organic matters and ammonia nitrogen in the water body; the beneficial bacteria and feed are proportionally mixed before the feed is put into the water body; after the feed is put into the water body, an underwater biomembrane taking the feed as a matrix is formed; the nitrogen, the phosphor and other harmful pollutants in the aquaculture water body can be effectively removed by jointly using the microalgae and the beneficial bacteria; simultaneously, the utilization efficiency of the feed can be improved by mixing the beneficial bacteria and the feed; and the water body is processed by using the microalgae and the beneficial bacteria, and then the snails and the filter-feeding fishes are put into the water body to prevent excessive multiplication of phycomycete, so that the self-purification of the aquaculture water environment can be realized.

The invention discloses an alga control method for a freshwater environment based on cultivation of barracudas and mullets, relating to a water treatment method. Aiming at solving the problem that algae can not be stably and thoroughly controlled in a eutrophic fresh water body, the method comprises the following steps: at least introducing one species of estuarine / marine fishes, such as barracudas and mullets which can only be propagated in sea water, and carrying out desalination processing before cultivation to enable the barracudas and the mullets to be adapted to a freshwater living environment, wherein the mesh size in the large water body ensures whether the cultivated fishes can escape; dividing or mixing according to different ages, carrying out culture in enclosure in girds by meshes, and simultaneously cultivating and propagating silver carps, bighead carps, other local fishes and local shellfish; and propagating local common aquatic plants. Thus, the fishes can be fed on the algae in a filter-feeding mode and simultaneously swallow detritus substances, thereby achieving the purpose of thoroughly purifying the water environment. By harvesting the cultivated and propagated aquatic organisms to remove nitrogen / phosphorus nutrients in water and humus in bed material from the water body, the method disclosed by the invention greatly improves the water quality of the cultivation water body.

The invention discloses a circulating running water aquaculture system which is an integrated system for stepped utilization and purification of aquaculture water in the technical field of the aquaculture water recycling. The system mainly comprises four units including a regulation pond 1, stepped fishponds, a biochemical pond 5 and a settling pond 6. In the system, a stepped culture and filter feeding organism filtering technology is utilized. Inflow water is river and lake water which satisfies the class III standard of the surface water environment quality standard (GB3838-2002); the quality of the recycled water satisfies the class III standard of the surface water environment quality standard (GB3838-2002); and the discharged water satisfies the first class standard A of the discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002) and can be used for afforesting, farmland irrigating or direct discharging. When the system is used for the aquaculture, the water repeated utilization factor can be improved, the pollutant discharge amount is reduced, and the system has higher economic value and social value.

The invention provides a high-efficiency, energy-saving and emission-reduction land-based sea water circulation culture method based on an ecosystem level. According to the method, an integral sea water circulating system isolated from the ocean is established on the land and is divided into a high-order culture region, a filter-feeding culture region, a salt-tolerant plant wetland and an ecological purification region; sea water is injected into the integral sea water circulating system, then sequentially flows through the high-order culture region, the filter-feeding culture region, the salt-tolerant plant wetland and the ecological purification region and finally returns to the high-order culture region; the high-order culture region is used for carrying out culture production operation on energy-input-type ocean economical organisms; the filter-feeding culture region is used for carrying out microalgae culture operation and carrying out culture production operation on ocean economical organisms capable of filter-feeding the microalgae; the salt-tolerant plant wetland is used for carrying out planting operation on salt-tolerant plants capable of absorbing nutritive salts; and the ecological purification region is used for carrying out water quality ecological purification operation.

A pond differential niche ecological water treatment facility is characterized in that a T-shaped water partition wall is arranged in a long strip-shaped aquiculture pond along the length direction to divide the cultivation pond into an eating fish aquiculture zone and a filter feeding fish aquiculture zone; the two zones are communicated by a fishing gate, a water inlet gate, a sewage colleting pipe and an aeration pipe; a conical sewage collecting pit is arranged at the pond bottom of one end, close to the fishing gate, of the eating fish aquiculture zone as an eating and defecting zone for fishes. Fishes of different niches in the pond are cultured in a separating mode, feces and residual baits of the eating fishes are concentrated and input to the filter feeding fish aquiculture zone by pneumatic water flows, and are re-eaten, purified, disintegrated or adsorbed by algae in the filter feeding fish aquiculture zone, thus ensuring the good water quality of the eating fish aquiculture zone, facilitating the growth of eating fishes, culturing the filter feeding fishes with the feces and residual baits of the eating fishes, improving the ecological effect of the pond aquiculture and reducing culture pollution.

The invention provides a combined high-efficiency river water quality purification process, which comprises the following steps of: purifying the water quality in rivers by simultaneously adopting an immersed biological filter bed and a microbial method, establishing an aquatic plant floating island and stocking filter-feeding fishes and zoobenthos. In the process, the water quality is purified by fully utilizing microorganisms, aquatic plants and animals in a system, the living conditions of aquatic organisms in the rivers are improved and simultaneously the effect of optimizing landscape is achieved.

The invention discloses an ecological restoration method for a municipal eutrophicated river. The method comprises the following steps: arranging a barring and controlling water level system at a barring and controlling water gate of the river; in the main stem of the river, piling cubic meters of earth obtained after desilting to form an along-river gentle slope and a river-center island, wherein a bank slope ratio is 1: 2.5 to 1: 5, and a shoal water zone and a deep and broad water zone are successively formed from a dam of the river to the center of the river; carrying out rock mound type and jack-like concrete block type bottom shape reconstruction on the slope surface of the along-river gentle slope; constructing embankment-zone aquatic plant zones at the river-center island and the along-river gentle slope having undergone bottom shape reconstruction and constructing a plant floating bed bio-zone in an along-river zone; and releasing filter-feeding and omnivore fish, shellfish and shrimps. With the restoration method provided by the invention, the water quality of the river is improved from class IV and V to class III or a higher class; biodiversity of a water area is increase by more than 2 times; the river has better capability in smooth regulation of water storage and flood discharge; and a water system has the further improved functions of underground water supplement, carbon immobilization, oxygen release, climate adjustment, water conservation, etc.

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 relates to an ecological cultivation method for shadow sea shells which comprises, carrying out mixed cultivation between filter-feeding shells (including scallop and oyster) and deposit-feeding animals (such as Oplopanax elatus) in the same layer of the commonly used raft-type cultivation cages. The method can alleviate the self-contamination in shallow sea shellfish culture.

The invention discloses a feed suitable for mixed raising mode of grass craps, silver carps and bighead carps on a large standard, which comprises the following components in percentage by weight: 3-8% of fish meal, 10-15% of bean meal, 10-15% of cotton meal, 17-22% of vegetable meal, 15-22% of rice bran, 15-20% of bran, 3-8% of rape seed, 3-8% of soybean, 0.3-0.8% of salt, 1-2% of calcium hydrophosphate, 1-2% of bentonite, and 0.8-1.5% of premix compound. In addition, the invention also provides a production method for the feed suitable for the mixed raising mode of grass craps, silver carpsand bighead carps on a large standard. Compared with the prior art, the feed suitable for the mixed raising mode of grass craps, silver carps and bighead carps on a large standard and the production method, which are provided by the invention, have the advantages that the adopted raw materials are low in cost, are easy to identify and have small possibility of counterfeit, thus the stability of the quality of the feed can be guaranteed to the maximum degree, grass carps on a large standard can be cultured, and the output of filter-feeding fishes is increased so as to improve the comprehensivebenefits of pond breeding.

The invention relates to a technique for treating polluted environment, which in detail is a comprehensive ecological restore method especially for etrophication waters in temperate zone in part of China. It combines the cultivation of large scale of algae and culture filter feeding animal of in etrophication waters to build a biological filter device and then restore polluted environment. The invention makes full use of ecological function of large scale algae absorbing dissolved nitrogen and phosphorus in large amount and ecological function of filter feeding animal filtering suspended particle and nutrient matter from water, to restore etrophication waters. The applied algae and filter feeding animal are important economical varieties, thus they can also bring economical benefit. The invention is characterized by both ecological benefit and economical benefit and suitability for etrophication waters in temperate zone in north of China.

A biological phosphorus-controlling and phosphorus-removing method used in the eutrophic lake internal pollution comprises the following steps: (1) filter-feeding fishes are put in a lake or reservoir to be treated to breed, the aim of controlling the internal phosphorus of a water body can be realized by utilizing different utilization efficiencies of the filter-feeding fishes to nitrogen and phosphorus in the water body; (2) when the filter-feeding fishes are bred, the number of ferocious fishes is controlled to ensure the survival rate of the bred filter-feeding fishes and increase the breeding efficiency and effect, wherein the filter-feeding fishes are silver carp and bighead carp, the ferocious fishes are Elopichthys bambusa, Culter alburnus and Culter mongolicus and the survival rate of the bred filter-feeding fishes is no less than 70%; and (3) fishes which eats organic detritus is bred at the bottom when the bottom has no fish to eat organic detritus to ensure that the biomass is no less than 1-10g / m<3>, wherein the bred or propagated fishes eating organic detritus are Xenocypris microlepis or crucian carp.

The invention relates to a combined ecological floating bed and a culture method thereof. The combined ecological floating bed falls into an upper layer, a middle layer and a lower layer. The upper layer is an aquatic plant area for planting halophilous terrestrial plants, the middle layer is an aquatic animal area for culturing aquatic animals, and the lower layer is for free-range filter feeding shellfish. The combined ecological floating bed is formed by series connection of combined ecological floating bed monomers. The combined ecological floating bed monomers are connected in series and then fixed to a timber pile so as to form the combined ecological floating bed, the four corners and the central position of which are respectively connected to a floating ball. The combined ecological floating bed and the culture method provided by the invention can comprehensively utilize the space levels of seawater pond water, integrate microorganism and plant remediation, by extending the food chain of a floating bed ecological system and strengthening the microbial enrichment characteristics of the floating bed, reduce culture diseases, improve the comprehensive benefits of culture, and simultaneously perform in-situ remediation on water, regulate the content of nitrogen and phosphorus of water and the pH value, and improve the transparency, etc.

The invention relates to an ultra-high-density industrial pond ecological breeding system and a regulation method thereof. According to the method, a breeding pond is divided into a main fish breeding area, a water treatment area and an accessory fish breeding area. Eating fishes are bred in the main fish breeding area, maximum fish carrying capacity is 120-160 kg / m<3>, the water treatment area is mainly used for biological purification treatment of breeding water, and filter feeding fishes are bred in the accessory fish breeding area. The breeding water is driven by an underwater plug-flow aeration device to enter the water treatment area for purification treatment from the main fish breeding area, is deep purified by the accessory fish breeding area and returns to the main fish breeding area, and the closed circulation process of the breeding water is finished. Effective microbial agents are fed, biochemical treatment of the breeding water is enhanced by a 'bacteria-algae-fish' symbiotic comprehensive regulation method, toxic and harmful substances in the water are removed, water eutrophication is prevented, and healthy breeding of the ultra-high-density pond is achieved. Breeding wastewater discharge is avoided, yield and quality are high, energy consumption is low, water and soil resources are protected and saved, and the method is a sustainable modern agricultural breeding and multiplication mode.

The invention discloses a method for treating pollution biogas slurry of poultry and livestock breeding. In the method, a traditional pig-biogas-fish biogas slurry treatment mode is adopted; five microbiological preparations, namely a bacillus preparation FB-1, a photosynthetic bacteria preparation FP-1, a lactobacillus preparation FL-2, a nitrifying bacteria preparation FN-1 and a denitrifying bacteria preparation FD-1, are utilized; and the mycelium FC-2 of actinomycete is used as a microorganism and filter-feeding fish adsorbent to perform strengthening treatment on the biogas slurry so as to perfect the treatment effect, improve the conversion efficiency and realize resource utilization of the nutrition of the biogas slurry. The method has the advantages of low investment cost, low running cost, simple operation, good treatment effect, wide application range and easy popularization in underdeveloped rural areas.

The invention relates to a method for purifying the aquaculture wastewater for prawns, and is intended to effectively filter out soluble harmful components, suspended substances and other harmful substances in the aquaculture water. The method sequentially comprises three-stage purification of the aquaculture wastewater: biological purification, filtration purification and absorption purification. In the biological purification, the algae is used for absorbing ammonium and other soluble harmful components in the wastewater discharged from the aquaculture pond as well as organic granules in the filter-feeding wastewater for filter-feeding shellfish and fish; in the filtration purification, the method allows the wastewater to pass through a sand-filtering field, so that the suspended granules and plankton in the wastewater can be filtered out; and in the absorption purification, parts of the soluble substances in the wastewater are absorbed by the surfaces of corallites and activated carbon, while parts of the soluble substances are absorbed and transformed by the beneficial bacteria growing on the surfaces of the corallites and the activated carbon. By adopting the circulation of aquaculture water, the invention can reduce the wastewater discharge and reduce the probability of outbreak and prevalence of prawn-related diseases on one hand, and by putting algae, shellfish and filter-feeding fish in the circulation, the invention can increase the income and the economic benefit of aquaculture on the other hand.

The invention discloses a comprehensive organism repairing method of an eutrophication seawater cage culture zone, which is characterized by comprising the following steps of: hanging large-scale seaweeds on the upper part of a water body in a cage culture zone by using immobilized microorganisms, the large-scale seaweeds and filter-feeding bivalves as a combined repairing organism; putting the filter-feeding bivalves capable of rapidly absorbing and converting inorganic nitrogen and phosphorus eutrophication substances in the water body to the bottom of the culture zone; putting the immobilized microorganisms partially depositing to the surface layer of a bottom material of a culture field; and intensifying the degradation of organic matters and the nitrification velocity of nitrogen in the water body or substrate sludge through the oxidization and the nitrification. The method has the characteristics that firstly, the comprehensive organism repairing method which uses the large-scale seaweeds, the filter-feeding bivalves and immobilized nitrobacteria as a main organism can eliminate the eutrophication substances and organic pollutants in the water body and the bottom material; and secondly, the large-scale seaweeds and the filter-feeding bivalves with higher economic value can be obtained while eliminating the pollutants, thereby great environment and economic benefits are achieved.

The invention discloses a method for controlling a polluted water body, which comprises the following steps of: throwing specific photosynthetic bacteria (Guangbaopai biological composite bacteria) into the water body by adopting a manual method so as to decompose organic pollutants in the water body by microbes and convert the organic pollutants into the substances such as carbon diode, water, gaseous ammonia nitrogen and the like; and reasonably collocating filter feeding aquatic animals (such as fish, bell, clam and the like) and aquatic plants so as to rebuild a food chain in the polluted water body and finish recycle of the pollutants by energy transfer of the food chain. The method realizes degradation and utilization of the pollutants, recovers the self-cleaning capability of the water body and builds and repairs the ecological system of the water body at the same time. The Guangbaopai biological composite bacteria are safe and reliable and have no secondary pollution, so the method has the advantages of saving of use and investment, moderate running expense and strong operability, and is particularly suitable for control of the open large-sized eutrophicated water body and repair of the aquatic ecological system.

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 belongs to the field of fish culture, and particularly relates to a silver carp breeding method. The silver carp breeding method comprises the following steps that (1) fishponds are cleaned; (2) fingerlings are bred; (3) feed is put in the fishponds to feed the fingerlings, after the fingerlings are put in the fishponds, the fingerlings mainly feed on plankton in a filter-feeding mode and also feed on feed scraps, and the fingerlings are fed with the feed which accounts for 2 percent to 2.5 percent of the weight of the fingerlings every time; (4) the overwintering fishponds should be clean and good in water-retaining property, the water depth underneath ice is kept to be about 1.5 meters, the fishponds are combined according to the size, 1.5-3.0 kilograms, per hectare, of 90-percent crystal trichlorfon is scattered all over each fishpond before ice blockage, the number of planktonic plants in pond water should be kept within the range from 25 mg / l to 50 mg / l, and therefore the light transmission of a water surface is maintained. According to the silver carp breeding method, the growth rate and the survival rate of silver carp breeding are increased.

The invention relates to the technical field of seawater ecological breeding, in particular to a double-circulation seawater prawn comprehensive breeding system. The system comprises a prawn breedingpond, a sludge treatment tank, a first-stage surface flow constructed wetland, a second-stage composite vertical flow constructed wetland, a shellfish and alga biological filter and a reservoir, wherein the prawn breeding pond, the sludge treatment pond, the first-stage surface flow constructed wetland, the second-stage composite vertical flow constructed wetland and the reservoir are sequentiallycommunicated; the shellfish and alga biological filter is in parallel connection with the first-stage surface flow constructed wetland and the second-stage composite vertical flow constructed wetland, and is also in serial connection with the first-stage surface flow constructed wetland and the second-stage composite vertical flow constructed wetland; secondary deep treatment can be carried out when necessary, economical tidal flat crabs and tidal flat fishes are bred in the sludge treatment tank, and filter-feeding fishes, shellfishes and snails are bred in the first-stage surface flow constructed wetland. The system can effectively filter away residual bait, excrement and the like in prawn breeding discharged water, can purify nitrogen, phosphorus and other pollutants, has good ecological benefits, is low in overall energy consumption and saves energy.

Effective sustained release of microbial pesticides in aquatic environments can be achieved by the combination of buoyant particles with a particulate microbial active ingredient. The resulting materials in the form of a particulate have combined density of less than one. The materials are then dispersed into gypsum slurry that is poured into briquette molds, or made into granules or pellets of various sizes, to form a solid, sinking, pest control composition. Once applied in aquatic field sites, the surface of the matrix slowly dissolves, releasing many minute buoyant pesticide laden particles to the water surface over the life of the product. Once at the surface, the particulate microbial pesticide(s) release from the buoyant particles and are distributed throughout the water column to be ingested by susceptible immature filter feeding mosquitoes and pestiferous flies.