CN102040282A - Alga control method for freshwater environment based on cultivation of barracudas and mullets - Google Patents
Alga control method for freshwater environment based on cultivation of barracudas and mullets Download PDFInfo
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- CN102040282A CN102040282A CN2009101973093A CN200910197309A CN102040282A CN 102040282 A CN102040282 A CN 102040282A CN 2009101973093 A CN2009101973093 A CN 2009101973093A CN 200910197309 A CN200910197309 A CN 200910197309A CN 102040282 A CN102040282 A CN 102040282A
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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- Farming Of Fish And Shellfish (AREA)
- Cultivation Of Seaweed (AREA)
Abstract
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.
Description
Technical field
The present invention relates to a kind of water treatment method, being specifically related to class offshore river mouth marine fishes and moving the method for supporting algae content in the control nature eutrophication fresh water water body, is to be applicable to prevent and control the method that high algae water occurs in the eutrophication fresh water water body environments such as lake, river course, reservoir, pond, landscape water body, artificial wet land system.
Background technology
Because the excessive input natural waters of nutritive substance such as nitrogen, phosphorus, the natural water eutrophication is more and more serious, causes algae excessive growth in the water, water quality deterioration, and the ecosystem is unbalance, influences the waterworks ordinary production, the human heavy demand to the low former water of algae of restriction.
Present algae control method both domestic and external has three classes: a class is easily to cause secondary pollution and chemical method residual but instant effect; One class is the very high physics method of cost that wastes time and energy; Also having a class is biological process; Biological process is low because of removing the algae cost, does not have by product and receives increasing concern, and its ultimate principle is to adopt the growth of moiety in special organism control algae or other food chains.In biological method, indigenous waterplant the eutrophication degree than the heavy water body in recovery rate not high always, exotic plants such as Herba Eichhorniae can be caused species invasion, use the microbiological manipulation algae to have health risk and ecological risk.Abroad by throwing in predacious fish or manually fishing for the fish quantity that reduces food zooplankton in the water body, the population quantity that improves zooplankton in the water body controls algae content, and this method effect in the big water surface and deep water body is not obvious, and success ratio is not high.Domesticly directly filter in the drinking water algae and control algae by putting filter-feeding fishes such as silver carp, flathead in a suitable place to breed, but owing to silver carp, flathead only can effectively filter food to macro, small-sized algae but increases rapidly, often makes before algae aggregate level and chlorophyll concentration are handled in the water body higher.In recent years, the breeding environment cleaning project is carried out rapidly, its core is with waterplant, filter feeder and substrate deposition property refuse is had the detritus feeding habits animal of the effect of ingesting is clean biometric, strengthen the environment cleaning function, reduce the Pollutant levels of breeding environment and existence water body, reach the degree of depth, thoroughly control the purpose of algae.
Mullet (Liza haematocheila), grey mullet (Mugil cephalus (Linnaeus)) are two kinds of offshore river mouth marine fishes, they can only be bred in seawater, grow through arriving in the fresh water after progressively desalination is raised and train, they are food with algae and detritus material.So far do not see to move to support in fresh water environments such as lake, river course, reservoir, pond, artificial swamp, to be used as clean biometric the environment of purifying waste water, the report of control blue algae bloom in the patent documentation.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing big water surface ambient water treatment technology, provide a kind of fresh water environment to move and support mullet, grey mullet algae control method, this method cost is low, simple to operate, there is not secondary pollution, the detritus material because mullet and grey mullet also eat in filter food algae, more thorough than silver carp, flathead purifying treatment effect; They can only be grown in fresh water and irreproducible, can not bring species invasion, when purifying water, can also increase than silver carp, flathead fine aquaculture products more, increase economy and social value.
The present invention is achieved through the following technical solutions:
A kind of fresh water environment is moved and is supported mullet, grey mullet algae control method, moves a kind of fish of supporting in mullet, the grey mullet in eutrophication fresh water water body at least; Move and handle through desalination progressively before supporting, allow them adapt to fresh water living environment, the specification of desalination is total length 2-5 centimetre or cultures fingerling in 24 months, takes then nearby or remote surviving transportation method is transferred in the water surrounding that needs to purify and be cultured; With the culture in enclosure of net sheet lattice, guarantee to move foster fish and can not escape the definite mesh size of control in the big water surface water body; Move foster fish and move fosterly by different age gradings or mixing, grid moves supports the zone and supports silver carp, bighead kind with time shift, propagation silver carp, bighead class; Original inhabitants shellfish spiral shell, a species of small clam living in fresh water, freshwater mussel accrue in water surrounding; Transplant local common waterplant; Fishery products such as the mullet, grey mullet, silver carp, flathead, shellfish of propagation according to the density situation of biomass in water surrounding catch year by year stay greatly little.
Fresh water environment is moved and is supported mullet, the grey mullet algae control method is finished by following steps: the 1. desalination of mullet, grey mullet: move the mullet and the grey mullet of 1-24 month monthly age size foster in specific Cultivation container, progressively add fresh water then, exclusive segment degree of saltiness water, reduce the salinity of cultivation water environment, make mullet and grey mullet fry and fingerling adapt to the freshwater aquiculture environment fully; The desalination optimum specifications is the 1-6 monthly age month, desalination required time 1-15 days, and the monthly age, big more desalination speed was slow more; 2. adapted at least a or two fishes in the mullet of freshwater aquiculture environment and the grey mullet fry and fingerling with the colony of arbitrary proportion combination nearby or remote keep-alive be transported to eutrophication water, put in a suitable place to breed by monthly age or size fractionation, guarantee when putting in a suitable place to breed that enclosure net sheet mesh size is fit to, make things convenient for fishing for of later stage, or mix not classification and move to support and to prevent that the small dimension fry from entering in the enclosure of big specification fry or run away; 3. move support to the lake, fresh water environments such as river, reservoir, release to move and support mullet, grey mullet fry and fingerling, every mu of area of 2-5 centimetre fry is put the 50-300 tail in a suitable place to breed, allow its self-sow breed, every cubic metre capacity reaches the 10-300 gram in the environment, can filter the food algae up hill and dale, the detritus material in the water surrounding of partly eating, reach the purpose of more thorough control algae, the fish body weight surpasses when 1000 grams and every cubic metre of environmental capacity restrain greater than 300 fishes for; 4. move in right amount in the big water surface of eutrophy or its enclosure and support silver carp, flathead, every cubic metre is moved the fingerling 5-40 gram that foster specification is the 25-100 gram, control fishing, breed indigenous shellfish such as spiral shell, a species of small clam living in fresh water, freshwater mussel simultaneously, allow hydrocoles growth and breeding in the enclosure or the big water surface, the content of Collaborative Control algae, silver carp, flathead reaches three ages and indigenous shellfish such as spiral shell, a species of small clam living in fresh water, should catch when freshwater mussel reached for two ages and stay for a short time greatly, reduces the capacity of water surrounding cultured fishes and shellfish; 5. the pasture and water in the initial stage propagation enclosure or the big water surface allow pasture and water assist to denitrogenate phosphorus, reduce body eutrophication, and pasture and water cover 1/3rd and introduce food grass carp or shrimp crab in right amount when above, rebuild and the optimization water surrounding ecosystem.
Advantage of the present invention and beneficial effect are:
1. the present invention compares with existing algae control method, and it is low, simple to operate to have a cost, does not have secondary pollution, and the mullet of introduction and mullet are irreproducible in fresh water, does not have the ecological risk of alien species invasion.Fish for the mullet and the grey mullet of results simultaneously and move and support and silver carp, flathead, the shellfish of propagation are taken part detritus material in nutritive salt such as algae, a part of nitrogen phosphorus and the substrate in the water out of water surrounding, purifying water body also can produce certain additional economic benefit.
2. benefit of the present invention is to utilize the mullet of introducing and grey mullet to eat algae simultaneously in filter, the detritus material of also eating, environment purification more completely, silver carp, flathead, shellfish and the waterplant of the original existence of the simultaneously big water surface breed in the enclosure environment, such ecosystem can more effective reduction algae bio amount, reaches control algae content and alleviates the purpose of eutrophication.
3. detritus feeding fishes such as mullet, grey mullet play the effect of desilting among the present invention in the ecosystem, the freshwater sediment organic matter is transported in the water, make matter and energy round-robin more optimized structure and reasonable in the ecosystem, additionally increase the output rate of freshwater settling organic matter.
4. the present invention moves the experiment of supporting mullet and grey mullet and obvious in the effect of lake, the Shanghai City enclosure experiment confirm control algae and the environment of purifying waste water in the pond, the comparison of algae content reduces 70-95% according to water body, has effectively controlled the outburst of eutrophication fresh water water body blue algae water bloom the anniversary.
5. unit of water body is required during algae moves foster fish quantity than additive method still less, carrying difficulty when reducing the operation of control algae in control in the present invention.
Embodiment
The present invention is described in further detail by following embodiment, but the technology contents that this embodiment is narrated is illustrative, rather than determinate, should not limit to protection scope of the present invention with this.
Embodiment 1: fresh water environment is moved and supported mullet, grey mullet algae control method is to move at least to support a kind of in mullet, the grey mullet in the eutrophication fresh water environment.Move foster preceding through progressively desalination processing; allow them adapt to fresh water living environment; the specification of desalination is total length 2-5 centimetre or cultures fingerling in 24 months, takes then nearby or remote surviving transportation method is transferred in the water surrounding that needs to purify and be cultured the feed of not throwing something and feeding in the breeding process.With the culture in enclosure of net sheet lattice, foster fish can not escape mesh size is standard to guarantee to move, and makes regular check on mesh, prevents the mesh breakage in the big water surface water body.Move foster mullet, grey mullet and move fosterly by different age gradings or mixing, grid moves supports that the zone is supported with time shift and propagation silver carp, bighead, controls fishing, and accrue indigenous shellfish such as spiral shell, a species of small clam living in fresh water, freshwater mussel are transplanted local common waterplant.Fishery products such as mullet, grey mullet, silver carp, flathead, shellfish such as spiral shell, a species of small clam living in fresh water of propagation, freshwater mussel according to the density situation in water surrounding catch year by year stay greatly little.
Embodiment 2: fresh water environment is moved and is supported mullet, the grey mullet algae control method comprises that concrete implementation content is the 1. desalination of mullet, grey mullet: move the mullet and the grey mullet of 1-24 month monthly age size foster in specific Cultivation container, guarantee the dissolved oxygen abundance, progressively add fresh water then, exclusive segment degree of saltiness water, reduce the salinity of cultivation water environment, make mullet and grey mullet fry and fingerling adapt to the freshwater aquiculture environment fully; The desalination optimum specifications is the 1-6 monthly age month, desalination required time 1-15 days, and the monthly age, big more desalination speed was slow more; 2. adapted at least a or two fishes in the mullet of freshwater aquiculture environment and the grey mullet fry and fingerling with the colony of arbitrary proportion combination nearby or remote keep-alive be transported to eutrophication water, put in a suitable place to breed by monthly age or size fractionation, guarantee when putting in a suitable place to breed that enclosure net sheet mesh size is fit to, make things convenient for fishing for of later stage, or mix not classification and move to support and to prevent that the small dimension fry from entering in the enclosure of big specification fry or run away; 3. move support to the lake, the water surface greatly such as river, reservoir, release to move and support mullet, grey mullet fry and fingerling, every mu of area of 2-5 centimetre fry is put the 50-300 tail in a suitable place to breed, allow its self-sow breed, every cubic metre capacity reaches the 10-300 gram in the environment, can filter the food algae up hill and dale, the detritus material in the water surrounding of eating, reach the purpose of more thorough control algae, the fish body weight surpasses when 1000 grams and every cubic metre of environmental capacity restrain greater than 300 fishes for; 4. move in right amount in the big water surface of eutrophy or its enclosure and support silver carp, flathead, every cubic metre is moved the fingerling 5-40 gram that foster specification is the 25-100 gram, control fishing, breed indigenous shellfish such as spiral shell, a species of small clam living in fresh water, freshwater mussel simultaneously, allow hydrocoles growth and breeding in the enclosure or the big water surface, the content of Collaborative Control algae, silver carp, flathead reaches three ages and indigenous shellfish such as spiral shell, a species of small clam living in fresh water, should catch when freshwater mussel reached for two ages and stay for a short time greatly, reduces the capacity of water surrounding cultured fishes and shellfish; 5. the pasture and water in the initial stage propagation enclosure or the big water surface allow pasture and water assist to denitrogenate phosphorus, reduce body eutrophication, and pasture and water cover 1/3rd and introduce food grass carp or shrimp crab in right amount when above, rebuild and the optimization water surrounding ecosystem.Present embodiment has been united and moved foster seawater fish---mullet, grey mullet (the filter food algae and the soil ulmin of eating), move and support freshwater fish---silver carp, flathead (assisting to remove algae), breed indigenous shellfish---spiral shell, a species of small clam living in fresh water, freshwater mussel (assisting to remove the algae water purification), breed indigenous pasture and water (assisting to purify substrate), more abundant from the more profound big water surface water body of eutrophication that makes except that algae, purify more thorough.Experimental result shows, move and support and propagation silver carp, flathead, propagation shellfish such as spiral shell, a species of small clam living in fresh water, freshwater mussel, algae average removal rate 40.5% to 73.2% behind the propagation pasture and water, but extra increase move support mullet, grey mullet after, the algae average removal rate is 92.6%.
Embodiment 3: present embodiment and embodiment 2 differences are to move foster mode: adapted in the mullet of freshwater aquiculture environment and the grey mullet fry and fingerling at least a fish nearby or remote keep-alive be transported to eutrophication water, age-based or size fractionation or mix not classification and put in a suitable place to breed, when putting in a suitable place to breed, classification guarantees that enclosure net sheet mesh size is fit to, prevent that the small dimension fry from entering in the enclosure of big specification fry or run away, and makes things convenient for fishing for of later stage; Small dimension mesh net sheet is going out certain regional environment near gulf, storehouse enclosure, put the small dimension fry and fingerling in a suitable place to breed, big specification mesh crosses more vast zone in the zone away from the gulf, storehouse, put the fingerling of above big specification of 6 monthly ages in a suitable place to breed, the fish body surpasses when 1000 grams and every cubic metre of environmental capacity restrain greater than 300 can carry out selective fishing, big individual mullet, grey mullet are pulled out, for little individual mullet, grey mullet are reserved environment space.
Embodiment 4: present embodiment and embodiment 2 differences are to move to support quantity and specification: move and support to the lake; the river; the big water surface such as reservoir; the mullet of releasing; the grey mullet fry and fingerling; 2-5 centimetre fry is put the 50-300 tail in a suitable place to breed for every mu; allow its self-sow; this specification fry desalination handles and keep-alive is transported all more convenient; move and support mullet; grey mullet class capacity of every cubic metre in environment reaches the 10-50 gram; can filter the food algae effectively; detritus material in the water surrounding of eating; it is more thorough more efficient to reach 100-300 gram time control algae; the comparison of algae content reduces 70-95% according to water body, has effectively controlled the outburst of eutrophication fresh water water body blue algae water bloom the anniversary.
Embodiment 5: present embodiment and embodiment 2 differences are to move in right amount to support silver carp, bighead kind and shellfish seed in the big water surface of eutrophy or its enclosure, control fishing, strengthen indigenous silver carp, flathead, the collaborative control of shellfish algae function, every cubic metre of water body moves into silver carp, bighead 5-40 gram, allow hydrocoles growth and breeding in the enclosure or the big water surface, the content of Collaborative Control algae, silver carp, flathead reach should catch when three ages and shellfish reached for two ages stay greatly little, reduce water surrounding and culture the quantity of silver carp, bighead class and shellfish, be similar little individual biological deposit environmental capacity.
Embodiment 6: present embodiment and embodiment 2 differences are the pasture and water in the initial stage propagation enclosure or the big water surface, allow pasture and water assist to denitrogenate phosphorus, reduce body eutrophication, pasture and water cover 1/3rd and begin to introduce when above and eat grass carp or shrimp crab, control pasture and water tempo is rebuild and the optimization water surrounding ecosystem.
Embodiment 7: present embodiment and embodiment 2 differences are that mullet, grey mullet fry control algae are added in the pond culture of 1.5 meters of average depths, move and support at least a fry in 2-5 centimetre of mullet, the grey mullet, the total quantity of every mu of immigration is the 100-300 tail, can effectively control algae content in the pond waters, the comparison of algae content reduces 80% according to water body, has effectively controlled the outburst of eutrophication fresh water water body blue algae water bloom the anniversary.Avoid the blue algae bloom growth.
Embodiment 8: present embodiment is pond culture interpolation mullet, the grey mullet fingerling control algae of 1.5 meters of average depths with enforcement 2 differences, move and support at least a fingerling in 100-300 gram mullet, the grey mullet, the total amount of every mu of immigration is the 10-50 kilogram, can effectively control algae content in the pond waters, the comparison of algae content reduces 85% according to water body, has effectively controlled the outburst of eutrophication fresh water water body blue algae water bloom the anniversary.Avoid the blue algae bloom growth.
Embodiment 9: present embodiment and embodiment 2 differences are the population mixtures of putting mullet, grey mullet and the two arbitrary proportion in area is three lake enclosures of 10 hectares respectively separately in a suitable place to breed, the enclosure depth of water is less than 20 meters, average depth 2.0-8.0 rice, every cubic metre of stocking rate 5-15 gram, in 2 year trial period, effectively control algae content in the enclosure water body, avoid the blue algae bloom growth.
Embodiment 10: present embodiment and embodiment 2 differences are that silver carp, the flathead in the enclosure improved the water body biomass in the mode that accrues, and control fishing, and increase the collaborative water purification effect of silver carp, flathead.
Embodiment 11: present embodiment and embodiment 2 differences are to increase in the enclosure to throw in silver carp, bighead kind, every tail specification is the 25-300 gram, improves silver carp, the flathead biomass in water body fast, controls fishing after putting in a suitable place to breed simultaneously, improve the collaborative water purification effect of silver carp flathead fast, fish for more than specification 1500 grams.
Embodiment 12: present embodiment and embodiment 2 differences are that the shellfish that increase is thrown in the enclosure is a bivalves, and specification 30-100 gram is main, and propagation is more obvious like this, fishes for more convenient.
Embodiment 13: present embodiment and embodiment 2 differences are the northern areas that can not pass the winter naturally grey mullet, and the grey mullet specification of input is the 100-400 gram, improves the water body alga-controlling ability, improves the commodity value of propagation grey mullet.
Embodiment 14: present embodiment and embodiment 2 differences are when the northern area eutrophication fresh water water body alga-controlling that grey mullet can not pass the winter naturally purifies, to throw in mullet, specification is in 24 monthly ages, makes once to drop into the lasting purifying treatment effect that produces for many years the control alga eruption.
Move in water surroundings such as landlocked freshwater lake, river course, reservoir, pond, landscape water body, artificial wet land systems and to support mullet, grey mullet, not moved foster area size, quantity what, purposes difference etc. influences; For improving water quality, control algae content, increase transparency and increase the fishery products output is that purpose is moved at least a fish in foster mullet and the grey mullet at freshwater.
Claims (10)
1. fresh water environment is moved and is supported mullet, grey mullet algae control method, it is characterized in that moving at least in eutrophication fresh water water body a kind of fish of supporting in mullet, the grey mullet; Move and handle through desalination progressively before supporting, allow them adapt to fresh water living environment, the specification of desalination is the fingerling in 24 months monthly ages, culture in the water surrounding of taking surviving transportation method to transfer to then to need to purify; With the culture in enclosure of net sheet lattice, mesh size is guaranteed to move foster fish and can not be escaped in the big water surface water body; Move foster fish and move fosterly by different age gradings or mixing, grid moves supports the zone and supports silver carp, bighead kind with time shift, propagation silver carp, bighead class; Original inhabitants shellfish such as spiral shell, a species of small clam living in fresh water, freshwater mussel accrue in water surrounding; Transplant local common waterplant; The mullet, grey mullet, silver carp, flathead, shellfish of propagation according to the density situation in water surrounding catch year by year stay greatly little.
2. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, it is characterized in that in eutrophication fresh water water body, moving at least a fish supported in mullet, the grey mullet and move and support mullet, two kinds of fishes of grey mullet with any amount mixed.
3. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, it is characterized in that mullet, grey mullet move support before through progressively desalination processing, allow them adapt to fresh water living environment, the specification of desalination is the fingerling in 24 months monthly ages, and best desalination specification is the fry and fingerling in the 1-6 monthly age month.
4. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, it is characterized in that moving foster by monthly age or size fractionation, guarantee when putting in a suitable place to breed that enclosure net sheet mesh size is fit to, make things convenient for fishing for of later stage, mix not classification and move to support and to prevent that the small dimension fry from entering in the enclosure of big specification fry or run away.
5. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, it is characterized in that releases to move in the big water surface such as lake, river, reservoir supports mullet, grey mullet fry and fingerling, every mu of area of 2-5 centimetre fry is put the 50-300 tail in a suitable place to breed, allow its self-sow breed, every cubic metre capacity reaches the 10-300 gram in the environment, can filter the food algae up hill and dale, detritus material in the water surrounding of eating, reach the purpose of more thorough control algae, fish for when the fish body weight surpasses 1000 grams and every cubic metre of environmental capacity greater than 300 grams.
6. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, it is characterized in that moving in right amount in the big water surface of eutrophy or its enclosure foster silver carp, flathead, every cubic metre is moved the fingerling 5-40 gram that foster specification is the 25-100 gram, control fishing, breed indigenous shellfish such as spiral shell, a species of small clam living in fresh water, freshwater mussel simultaneously, allow hydrocoles growth and breeding in the enclosure or the big water surface, the content of Collaborative Control algae, silver carp, flathead reach three ages and indigenous shellfish such as spiral shell, a species of small clam living in fresh water, should catch when freshwater mussel reached for two ages and stay for a short time greatly, reduces the capacity of water surrounding cultured fishes and shellfish.
7. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, it is characterized in that the pasture and water in the initial stage propagation enclosure or the big water surface, allow pasture and water assist to denitrogenate phosphorus, reduce body eutrophication, pasture and water cover 1/3rd and introduce food grass carp or shrimp crab in right amount when above, rebuild and the optimization water surrounding ecosystem.
8. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, when it is characterized in that the northern area eutrophication fresh water water body alga-controlling that can not pass the winter naturally grey mullet purifies, to throw in mullet, specification is in 24 monthly ages, make and once drop into the lasting purifying treatment effect that produces for many years, the control alga eruption; The grey mullet specification of throwing in is the 100-400 gram.
9. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, it is characterized in that putting in a suitable place to breed separately respectively in the enclosure of lake the population mixture of mullet, grey mullet and the two arbitrary proportion, the enclosure depth of water is less than 20 meters, average depth 2.0-8.0 rice, every cubic metre of stocking rate 5-15 gram.
10. move according to claims 1 described fresh water environment and support mullet, grey mullet algae control method, it is characterized in that moving foster mullet, grey mullet in water surroundings such as landlocked freshwater lake, river course, reservoir, pond, artificial swamps; For improving water quality, control algae content, increase transparency and increase the fishery products output is that purpose is moved at least a fish in foster mullet and the grey mullet at freshwater.
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