CN104429903A - Floating type ecological reef - Google Patents

Floating type ecological reef Download PDF

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Publication number
CN104429903A
CN104429903A CN201410208469.4A CN201410208469A CN104429903A CN 104429903 A CN104429903 A CN 104429903A CN 201410208469 A CN201410208469 A CN 201410208469A CN 104429903 A CN104429903 A CN 104429903A
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China
Prior art keywords
sliding sleeve
fan
shaped support
sink
reel
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Granted
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CN201410208469.4A
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Chinese (zh)
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CN104429903B (en
Inventor
马家志
田淑娴
曹东阳
蔡厚才
宋伟华
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Zhejiang Ocean University ZJOU
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Zhejiang Ocean University ZJOU
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Priority to CN201410208469.4A priority Critical patent/CN104429903B/en
Publication of CN104429903A publication Critical patent/CN104429903A/en
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Publication of CN104429903B publication Critical patent/CN104429903B/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management

Abstract

The invention discloses a floating type ecological reef which comprises a floater, a supporting frame and a balancing weight, wherein the floater, the supporting frame and the balancing weight are sequentially connected through a pull rope. The supporting frame comprises a center rod, a sliding sleeve connected with the center rod in a sliding mode and multiple sector supporting boards arranged in the circumferential direction of the center rod. Multiple seaweed cultivation bricks are arranged on the sector supporting boards. A connecting seat is arranged at the top of the center rod. The sector supporting boards are rotationally connected with the connecting seat on the vertical plane. Supporting rods are hinged between the sliding sleeve and the lower surface of the sector supporting boards respectively. The sliding sleeve is connected with the connecting seat through a tension spring. A deflation valve is arranged on the floater. According to the floating type ecological reef, seaweed seedlings can be attached to the reef for growth, good protection is provided for the seaweed seedlings in the primary growth period, the survival rate of seaweed is increased, and centralized release and convenient management are facilitated.

Description

Sink and emerge type ecologic reef
Technical field
The present invention relates to marine algae cultivation field, especially relate to a kind of sink and emerge type ecologic reef.
Background technology
Grow thickly in tangleweed intertidal zone inferior segment and seabed, subtidal zone phytal zone between middle and high latitude marine site, as supporting plant and other planktons, necton and zoobenthos and the envirment factor that coexists with it forms the offshore ecosystem jointly.Be that the sea jungle supported has very high primary productivity with tangleweed, form complicated animals and plants food web can the eutrophication such as enrichment of N, P salt simultaneously, restrains " red tide " outburst, protect the marine environment.The economic worth that sea jungle is created is very large, and marine alga itself has industry, edible, medical value, the place that sea jungle more provides fish forage, keeps away enemy, lays eggs.But show according to nearest observed result, sea jungle disappears, seaweed bio diversity declines simultaneously.
Reparation at present with regard to sea jungle has some researchs, mainly contains and sets up nature reserve, reduce the destruction of human activity; Carry out the biological research of artificial propagation and related work, as room heat source and seed intermediate rearing.During artificial breeding, gather ripe kind algae more in laboratory, carry out Spawning, zygote sprouting, be attached on adhesive substrate, grow seedling, though juvenile sporophyte adheres to good on the adherance such as shell, rock, not easily by it input in the seawater; Vinylon rope is made seedling curtain and is kept hanging on sea, but seedling strain growth is unhealthy and strong, and management is inconvenience comparatively; Directly on the rock of intertidal zone, spray spore fluid, spore is successfully sprouted and the probability of set growth is too little.
Summary of the invention
The present invention be in order to overcome in prior art in sea jungle, breed marine alga time; cause marine alga survival rate low to the initial stage protection deficiency of marine alga seedling; the deficiency of management inconvenience; provide one and be convenient to marine alga seedling apposition growth; marine alga seedling for early growth period provides better protection, is convenient to concentrate throw in and the convenient sink and emerge type ecologic reef managed while improving marine alga survival rate.
To achieve these goals, the present invention is by the following technical solutions:
A kind of sink and emerge type ecologic reef of the present invention, comprise float connected by stay cord successively, bracing frame and balancing weight, described bracing frame comprises center-pole, the sliding sleeve be slidably connected with center-pole and some fan-shaped support plates around center-pole circumferential directions, fan-shaped support plate is provided with some algae culture bricks, the top of described center-pole is provided with Connection Block, described fan-shaped support plate and Connection Block are rotationally connected on vertical plane, support bar is hinged with respectively between sliding sleeve and each fan-shaped support plate lower surface, connected by extension spring between described sliding sleeve and Connection Block, described float is provided with vent valve.Float, bracing frame are connected by stay cord with breeding block, can put in seawater easily, by float and balancing weight effect, bracing frame is made to be in suspended state, be convenient to carry out observing and managing, algae culture brick is in seawater region at the middle and upper levels, is convenient to marine alga and obtains sufficient sunlight and nutrient.When sliding sleeve is in sliding stroke top dead centre, the gap between fan-shaped support plate is less, is convenient to marine alga seedling apposition growth on algae culture brick, improves the survival rate of marine alga seedling, plays better protective effect.When after seaweed growth, weight constantly increases, fan-shaped support plate rotates around Connection Block under gravity, the elastic force making sliding sleeve overcome extension spring moves down, realize the expansion of fan-shaped support plate, gap between fan-shaped support plate increases, be separated from each other, the marine stream inside and outside bracing frame is more convenient, improves the growth rate of marine alga further.
As preferably, described vent valve is included in the fairlead vertically arranged in float, the piston that can slide in fairlead inner chamber and the limit spring acting on piston, its upper end of the stay cord be connected with bracing frame is connected with piston, fairlead inner cavity top is provided with valve body, be provided with the spool being communicated with the inner and extraneous bleed passage of float and controlling bleed passage opening and closing in valve body, the lower end of spool be provided with can with the shade of piston contact and valve core reseting spring.Like this when occurring bad weather, when stormy waves is larger, piston can promote valve body, carries out bleed air operation to float, realizes the automatic sinking of bracing frame thus hides stormy waves, playing good protection to marine alga.
As preferably, described algae culture brick is evenly arranged on fan-shaped support plate, is provided with gap between adjacent algae culture brick, and described fan-shaped support plate is provided with some limberss corresponding with interstitial site.Limbers is set and can improves fan-shaped support plate both sides water body flow, realize good water circulation.
As preferably, the top of described fairlead is provided with reel and small floating ball, reel is wound with the recovery cable for connecting small floating ball, and the top of described vent valve is provided with the reel detent mechanism that restriction reel rotates.
As preferably, described reel detent mechanism comprises the traveller and traveller back-moving spring that can move upward under spool effect, and the top of traveller is provided with reel alignment pin and the linking arm for fixing reel alignment pin.While piston promotes spool venting, spool promotes traveller, thus removes spacing for reel of reel detent mechanism, and small floating ball floats, so that manager identifies thus salvages in time.
As preferably, the top of described fairlead is provided with traveller alignment pin and traveller alignment pin back-moving spring, and described traveller is axially provided with two locating slots matched with alignment pin.Limited the duty of traveller by locating slot, ensure the timely unwrapping wire of reel.
As preferably, the opening part of described bleed passage is provided with and makes the unidirectional check valve be vented of bleed passage outwardly.Check valve is set thus avoids seawater to enter into bleed passage.
As preferably, the bottom of described center-pole is provided with sliding sleeve positioning seat, the bottom of described sliding sleeve side is provided with stopper slot, the upper surface of sliding sleeve positioning seat is provided with and the deep gouge matched bottom sliding sleeve, the edge of described deep gouge is provided with the spill spin block of arranged off-centre, the side of spill spin block is provided with the card access surface matched with stopper slot, spill spin block is provided with the torsion spring that card access surface and stopper slot can be made to lock, the bottom of deep gouge is provided with can slide up and down triggering block and the triggering block back-moving spring that coordinates with triggering block, and triggering block is provided with the spill spin block alignment pin for position rotating block.After bracing frame launches completely, triggering block can position sliding sleeve, avoids sliding sleeve slippage repeatedly, ensures marine alga stable growth.
As preferably, described fan-shaped support plate is recessed to form cambered surface downwards.The surface area of fan-shaped support plate is improved by depression; algae culture brick is formed to tilt or vertical facade at fan-shaped support plate, imitates the environment of precipitous seabed cay, makes algae strain well-grown; metastable subenvironment can be built simultaneously, good protection is played to marine alga seedling.
Therefore, the present invention has following beneficial effect: (1) conveniently carries out the concentrated input of marine alga seedling, convenient observation and management; (2) realize the initial stage protection of seedling, improve survival rate, ensure the cultivation effect of marine alga; (3) can automatically sink when high sea is attacked thus hide high sea, reduce the loss that marine alga is destroyed, good protection is played to marine alga; (4) after sinking, small floating ball emerges, and conveniently carries out salvaging and reclaiming by reclaiming cable; (5) reclaim and the algae culturing of next round can be dropped into after changing algae culture brick, being convenient to gathering and the re-using of entirety of marine alga, reducing use cost.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 be in Fig. 1 of the present invention bracing frame partly cut open figure;
Fig. 3 is the partial enlarged drawing of float in the present invention;
Fig. 4 is the partial enlarged drawing at A place in Fig. 3 of the present invention;
Fig. 5 is the structural representation in the present invention after fan-shaped support plate expansion;
Fig. 6 is the partial enlarged drawing at B place in Fig. 5 of the present invention.
In figure, float 1, vent valve 2, limit spring 201, fairlead 202, piston 203, valve core reseting spring 204, valve body 205, small floating ball 206, top cover labyrinth 207, bleed passage 208, spool 209, lower sealing cover 210, bracing frame 3, extension spring 301, center-pole 302, sliding sleeve 303, stopper slot 303a, support bar 304, fan-shaped support plate 305, Connection Block 306, limbers 307, balancing weight 4, sliding sleeve positioning seat 5, deep gouge 5a, stay cord 6, algae culture brick 7, traveller back-moving spring 8, traveller 9, reel alignment pin 9a, linking arm 9b, reclaim cable 10, reel 11, traveller alignment pin 12, traveller alignment pin back-moving spring 13, check valve 14, rotating shaft 15, spill spin block 16, handle 16a, spill spin block locating hole 16b, torsion spring 17, triggering block 18, spill spin block alignment pin 18a, triggering block back-moving spring 19.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
In embodiment as shown in Figure 1, a kind of sink and emerge type ecologic reef, comprise float 1, bracing frame 3 and balancing weight 4, three is connected by stay cord, wherein, bracing frame 3 as shown in Figure 2, comprise center-pole 302, sliding sleeve 303 and some fan-shaped support plates 305, center-pole 302 is vertically arranged, sliding sleeve 303 can slide up and down along center-pole 302, the top of center-pole 302 is provided with Connection Block 306, and fan-shaped support plate 305 around center-pole 302 circumferential directions, can rotate relative to Connection Block 306 on Connection Block 306 on vertical plane.Fan-shaped support plate 305 is provided with some algae culture bricks 7, and algae culture brick 7 is evenly arranged on fan-shaped support plate 305, is provided with gap between adjacent algae culture brick 7, and fan-shaped support plate 305 is provided with some limberss 307 corresponding with interstitial site.Support bar 304 is hinged with respectively between sliding sleeve 303 and each fan-shaped support plate 305 lower surface, connected by extension spring 301 between sliding sleeve 303 and Connection Block 306, when fan-shaped support plate 305 rotates, drive support bar 304 to promote sliding sleeve 303 slide downward, extension spring 301 is stretched.The corresponding lateral edges of adjacent fan-shaped support plate 305 has minimum gap when sliding sleeve 303 is in sliding stroke top dead centre.Fan-shaped support plate 305 is recessed to form cambered surface downwards, thus improving the surface area of fan-shaped support plate 305, algae culture brick 7 is formed to tilt or vertical facade at fan-shaped support plate 305, imitates the environment of precipitous seabed cay, make algae strain well-grown, be conducive to building metastable culture environment.
As shown in Figure 3, float 1 is provided with vent valve 2, be included in the fairlead 202 vertically arranged in float 1, the piston 203 that can slide in fairlead 202 inner chamber and limit spring 201, limit spring 201 is Compress Spring, connect bottom piston 203 and fairlead 202, its upper end of stay cord 6 be connected with bracing frame 3 is in addition connected with piston 203.Fairlead 202 upper end is fixed with top cover labyrinth 207, and fairlead 202 lower end is fixed with lower sealing cover 210, is sealed by float 1 by top cover labyrinth 207, lower sealing cover 210.Fairlead 202 inner cavity top is provided with valve body 205, the spool 209 being communicated with the inner and extraneous bleed passage 208 of float 1 and controlling bleed passage 208 opening and closing is provided with in valve body 205, fairlead 202 and top cover labyrinth 207 also there is the venthole corresponding with bleed passage 208, thus forms unimpeded gas circuit.The lower end of spool 209 is provided with the shade and valve core reseting spring 204 that can contact with piston 203, when piston 203 upwardly spool 209 time, bleed passage 208 is opened by spool 209, and the air in float 1 can be discharged by bleed passage 208.Piston 203 can be offered through hole to move up and down to facilitate piston 203.The opening part of bleed passage 208 is provided with check valve 14, and the air in the float 1 made can only be vented outwardly by bleed passage 208 is unidirectional, and the air in the external world and seawater cannot enter into bleed passage 208.In addition, float 1 should be provided with valve to inflate it to facilitate.
As shown in Figure 4, the top of fairlead 202 is provided with reel 11 and small floating ball 206, and reel 11 is arranged on top cover labyrinth 207, reel 11 is wound with the recovery cable 10 for connecting small floating ball 206.The top of vent valve 2 is provided with the reel detent mechanism of restriction reel 11 rotation, comprise the traveller 9 and traveller back-moving spring 8 that can move upward under spool 209 acts on, traveller 9 runs through top cover labyrinth 207, and is provided with reel alignment pin 9a and the linking arm 9b for fixing reel alignment pin 9a on traveller 9 top.When spool 209 upwardly traveller 9 time, linking arm 9b drives reel alignment pin 9a to leave locating hole on reel 11, thus removes the positioning states of reel 11, and reel 11 can freely rotate, and reclaiming cable 10 can freely pull out.The top of fairlead 202 is provided with traveller alignment pin 12 and traveller alignment pin back-moving spring 13, traveller 9 is axially provided with two locating slots matched with alignment pin, the positioning states of the corresponding reel 11 of difference and free rotary state, thus prevent external environment for the maloperation of reel 11.
After launching as shown in Figure 5, sliding sleeve 303 is positioned at the lower dead center of sliding stroke to fan-shaped support plate 305, and extension spring 301 is stretched, and the aperture now between fan-shaped support plate 305 is maximum.Shown in composition graphs 6, the bottom of center-pole 302 is provided with sliding sleeve positioning seat 5, the bottom of sliding sleeve 303 side is provided with stopper slot 303a, the upper surface of sliding sleeve positioning seat 5 is provided with and the deep gouge 5a matched bottom sliding sleeve 303, the edge of deep gouge 5a is provided with the spill spin block 16 of arranged off-centre, the side of spill spin block 16 is provided with the card access surface matched with stopper slot 303a, and spill spin block 16 is provided with the torsion spring 17 that card access surface and stopper slot 303a can be made to lock, and spill spin block 16 is positioned by rotating shaft 15.The bottom of deep gouge 5a is provided with can slide up and down triggering block 18 and the triggering block back-moving spring 19 that coordinates with triggering block 18, and triggering block 18 is provided with the spill spin block alignment pin 18a for position rotating block 16.During original state, spill spin block alignment pin 18a acts on spill spin block locating hole 16b, and the bottom of sliding sleeve 303 can be entered in deep gouge 5a smoothly; When the bottom of sliding sleeve 303 can enter in deep gouge 5a smoothly, the bottom of sliding sleeve 303 presses triggering block 18 downwards, make spill spin block alignment pin 18a leave spill spin block locating hole 16b, spill spin block 16 rotates under torsion spring 17 acts on, and makes card access surface enter into stopper slot 303a and lock with it.In addition spill spin block 16 is also provided with the handle 16a of one, to facilitate manual pulling handle 16a thus to rotate spill spin block 16, removes the lock-out state of sliding sleeve 303.
Algae culture brick 7 adopts hexagon light foam concrete to make, and brick surface inserting has shell, barnacle, marial rocks fragment etc., its coarse holdfast being easy to algae is held, presses close to ecosystem, make the easier set of algae strain and breeding.Drop into before marine usage, first algae culture brick modification of nylon rope is together in series, with sea water immersion 24 hours.Be inlaid with shell, marial rocks fragment matsurface upward, be laid at the bottom of nursery pond, wait for that marine alga sporophyte is sprouted and attachment.When marine alga seedling grows to the specification can plunged into the commercial sea and cultivate, the algae culture brick 7 being loaded with marine alga seedling is moved on fan-shaped support plate 305.After completing algae culture brick, whole device can drop into marine usage.Across the sea with hawser location float 1, at a distance of 1.5m or more sparse between each device.According to the physilogical characteristics of cultivated algae and the demand of different development stage, stay cord 6 length can be adjusted to adapt to upright position under water.
After the dispensing, along with after seaweed growth, weight constantly increases, and fan-shaped support plate 305 rotates around Connection Block 306 under gravity, and the elastic force making sliding sleeve 303 overcome extension spring 301 moves down, and realizes the continuous expansion of fan-shaped support plate 305.The spacing of fan-shaped support plate 305 increases, and is separated from each other, so that seawater flow in bracing frame 3 form water body exchange.When the bad weathers such as typhoon come interim, marine stormy waves is larger, to stir amplitude larger along with sea for float 1, stay cord 6 is stressed larger, piston 203, after limit spring 201 resilience, can promote valve body 205, exits to float 1, device overall buoyancy reduces, and makes bracing frame 3 automatically sink thus hide stormy waves.Valve body 205 is while carrying out exitting, and also by the latch-release of reel 11, small floating ball 206 can emersion sea, salvages at bad weather to facilitate manager in the past.

Claims (9)

1. a sink and emerge type ecologic reef, it is characterized in that, comprise float (1) connected by stay cord successively, bracing frame (3) and balancing weight (4), described bracing frame (3) comprises center-pole (302), the sliding sleeve (303) be slidably connected with center-pole (302) and some fan-shaped support plates (305) around center-pole (302) circumferential directions, fan-shaped support plate (305) is provided with some algae culture bricks (7), the top of described center-pole (302) is provided with Connection Block (306), described fan-shaped support plate (305) and Connection Block (306) are rotationally connected on vertical plane, support bar (304) is hinged with respectively between sliding sleeve (303) and each fan-shaped support plate (305) lower surface, connected by extension spring (301) between described sliding sleeve (303) and Connection Block (306), described float (1) is provided with vent valve (2).
2. sink and emerge type ecologic reef according to claim 1, it is characterized in that, described vent valve (2) is included in the fairlead (202) vertically arranged in float (1), the piston (203) that can slide in fairlead (202) inner chamber and the limit spring (201) acting on piston (203), stay cord (6) its upper end be connected with bracing frame (3) is connected with piston (203), fairlead (202) inner cavity top is provided with valve body (205), the spool (209) being communicated with the inner and extraneous bleed passage (208) of float (1) and controlling bleed passage (208) opening and closing is provided with in valve body (205), the lower end of spool (209) is provided with the shade and valve core reseting spring (204) that can contact with piston (203).
3. sink and emerge type ecologic reef according to claim 1, it is characterized in that, described algae culture brick (7) is evenly arranged on fan-shaped support plate (305), be provided with gap between adjacent algae culture brick, described fan-shaped support plate (305) is provided with some limberss corresponding with interstitial site (307).
4. the sink and emerge type ecologic reef according to claim 1 or 2 or 3, it is characterized in that, the top of described fairlead (202) is provided with reel (11) and small floating ball (206), reel (11) is wound with the recovery cable (10) for connecting small floating ball (206), the top of described vent valve (2) is provided with the reel detent mechanism limiting reel (11) and rotate.
5. sink and emerge type ecologic reef according to claim 4, it is characterized in that, described reel detent mechanism comprises the traveller (9) and traveller back-moving spring (8) that can move upward under spool (209) effect, and the top of traveller (9) is provided with reel alignment pin (9a) and the linking arm (9b) for fixing reel alignment pin (9a).
6. sink and emerge type ecologic reef according to claim 5, it is characterized in that, the top of described fairlead (202) is provided with traveller alignment pin (12) and traveller alignment pin back-moving spring (13), and described traveller (9) is axially provided with two locating slots matched with alignment pin.
7. sink and emerge type ecologic reef according to claim 2, is characterized in that, the opening part of described bleed passage (208) is provided with and makes the unidirectional check valve (14) be vented of bleed passage (208) outwardly.
8. the sink and emerge type ecologic reef according to claim 1 or 2 or 3, it is characterized in that, the bottom of described center-pole (302) is provided with sliding sleeve positioning seat (5), the bottom of described sliding sleeve (303) side is provided with stopper slot (303a), the upper surface of sliding sleeve positioning seat (5) is provided with the deep gouge (5a) matched with sliding sleeve (303) bottom, the edge of described deep gouge (5a) is provided with the spill spin block (16) of arranged off-centre, the side of spill spin block (16) is provided with the card access surface matched with stopper slot (303a), spill spin block (16) is provided with the torsion spring (17) that card access surface and stopper slot (303a) can be made to lock, the triggering block back-moving spring (19) that the bottom of deep gouge (5a) is provided with the triggering block that can slide up and down (18) and coordinates with triggering block (18), triggering block (18) is provided with the spill spin block alignment pin (18a) for position rotating block (16).
9. the sink and emerge type ecologic reef according to claim 1 or 2 or 3, is characterized in that, described fan-shaped support plate (305) is recessed to form cambered surface downwards.
CN201410208469.4A 2014-05-15 2014-05-15 Formula of drifting along ecologic reef Active CN104429903B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109769684A (en) * 2019-01-29 2019-05-21 浙江省海洋水产研究所 Multifunctional large-scale algae culturing platform
CN109832185A (en) * 2019-01-29 2019-06-04 浙江省海洋水产研究所 A kind of floated Algae Ecology prosthetic device settled
CN114081009A (en) * 2021-11-23 2022-02-25 烟台市海洋经济研究院(烟台市渔业技术推广站、烟台市海洋捕捞增殖管理站) Algal reef device convenient to change

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CN101960982A (en) * 2010-09-30 2011-02-02 宁波大学 Artificial macroalgae field in mixed seawater area and construction method thereof
CN102405868A (en) * 2011-11-07 2012-04-11 中国海洋大学 Seedling inserting rope-shell combined artificial algal reef
JP2014054187A (en) * 2012-09-11 2014-03-27 Artificial Sea-Mount Institute Method for constructing artificial sea bottom mountain-ridge

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JP2007060910A (en) * 2005-08-29 2007-03-15 Ehime Univ Method for policulture of seaweed and bivalve
CN101011021A (en) * 2007-01-27 2007-08-08 中国海洋大学 Sea urchin eating-proof artificial algal reef
JP2008182979A (en) * 2007-01-31 2008-08-14 Fujita Corp Artificial floating island, and water purification method using the same
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109769684A (en) * 2019-01-29 2019-05-21 浙江省海洋水产研究所 Multifunctional large-scale algae culturing platform
CN109832185A (en) * 2019-01-29 2019-06-04 浙江省海洋水产研究所 A kind of floated Algae Ecology prosthetic device settled
CN109769684B (en) * 2019-01-29 2020-12-11 浙江省海洋水产研究所 Multifunctional large-scale seaweed culture platform
CN114081009A (en) * 2021-11-23 2022-02-25 烟台市海洋经济研究院(烟台市渔业技术推广站、烟台市海洋捕捞增殖管理站) Algal reef device convenient to change

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