CN107517907B - Ecological breeding method for improving sea cucumber yield - Google Patents
Ecological breeding method for improving sea cucumber yield Download PDFInfo
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- CN107517907B CN107517907B CN201710779891.9A CN201710779891A CN107517907B CN 107517907 B CN107517907 B CN 107517907B CN 201710779891 A CN201710779891 A CN 201710779891A CN 107517907 B CN107517907 B CN 107517907B
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- 241000251511 Holothuroidea Species 0.000 title claims abstract description 48
- 238000009395 breeding Methods 0.000 title claims abstract description 10
- 239000013535 sea water Substances 0.000 claims abstract description 17
- 241001392689 Ecklonia maxima Species 0.000 claims abstract description 9
- 238000009364 mariculture Methods 0.000 claims abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 42
- 239000001301 oxygen Substances 0.000 claims description 42
- 229910052760 oxygen Inorganic materials 0.000 claims description 42
- 239000003337 fertilizer Substances 0.000 claims description 15
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 14
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 14
- 241001330002 Bambuseae Species 0.000 claims description 14
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 14
- 239000011425 bamboo Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000003203 everyday effect Effects 0.000 claims description 9
- 235000013305 food Nutrition 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 7
- 229930191978 Gibberellin Natural products 0.000 claims description 6
- IXORZMNAPKEEDV-UHFFFAOYSA-N gibberellic acid GA3 Natural products OC(=O)C1C2(C3)CC(=C)C3(O)CCC2C2(C=CC3O)C1C3(C)C(=O)O2 IXORZMNAPKEEDV-UHFFFAOYSA-N 0.000 claims description 6
- 239000003448 gibberellin Substances 0.000 claims description 6
- 235000015097 nutrients Nutrition 0.000 claims description 5
- 241000196324 Embryophyta Species 0.000 claims description 4
- 238000012258 culturing Methods 0.000 claims description 3
- 230000002354 daily effect Effects 0.000 claims description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 abstract description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 4
- VTEIFHQUZWABDE-UHFFFAOYSA-N 2-(2,5-dimethoxy-4-methylphenyl)-2-methoxyethanamine Chemical compound COC(CN)C1=CC(OC)=C(C)C=C1OC VTEIFHQUZWABDE-UHFFFAOYSA-N 0.000 abstract description 3
- 208000034699 Vitreous floaters Diseases 0.000 description 9
- 241000238557 Decapoda Species 0.000 description 6
- 238000012136 culture method Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 241000237891 Haliotidae Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/60—Floating cultivation devices, e.g. rafts or floating fish-farms
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G33/00—Cultivation of seaweed or algae
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/30—Culture of aquatic animals of sponges, sea urchins or sea cucumbers
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Marine Sciences & Fisheries (AREA)
- Zoology (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Cultivation Of Plants (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The invention discloses an ecological breeding method for improving the yield of sea cucumbers. The invention discloses an ecological breeding method for improving the yield of sea cucumbers, which adopts any one of the mariculture net cages, and comprises the following steps: the sea cucumber is cultured in a net cage; and (2) planting the American sea shoots in the planting cup. According to the invention, the floating plates and the planting cups for planting the American sea bamboo shoots are arranged in the net cage, so that the contents of COD, BOD, ammonia nitrogen and nitrite in seawater can be effectively reduced, the growth environment of marine products can be purified, the growth of the marine products is promoted, the American sea bamboo shoots are harvested, and the ornamental value of sea surface is also achieved.
Description
Technical Field
The invention relates to an ecological seawater culture net cage and a sea cucumber culture method.
Background
At present, the method for artificially culturing sea cucumbers is to enclose sea water into a net cage through a protective net and culture the sea cucumbers in the net cage. Because the sea cucumber is terrible to light, the growth of the sea cucumber can be inhibited by strong light and high temperature, and a shading material needs to be lapped on a protective net. In addition, in the process of sea cucumber growth, the increase of COD, BOD, ammonia nitrogen and nitrite in the sea water can be promoted by the excrement of the sea cucumber and the feeding of baits, the living environment of the sea cucumber is deteriorated, and the yield of the sea cucumber is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides an ecological mariculture net cage capable of improving the yield of marine products and an ecological culture method capable of improving the yield of sea cucumbers.
In order to solve the technical problem, the ecological mariculture net cage comprises a net cage positioning device and a net cage arranged on the net cage positioning device, wherein the top surface of the net cage is open and is positioned above the water surface, a floating plate is arranged in the net cage, and a plurality of western marine bamboo shoot planting cups are arranged on the floating plate.
For better fixed box with a net, the box with a net have a plurality ofly, a plurality of box with a net are arranged into one row, box with a net positioner includes two location ropes and a plurality of floater, the side by side setting of two location ropes, the both ends anchor respectively of two location ropes is at the bottom, the four corners at the top of every box with a net is provided with a floater, the floater supports the below at the location rope, the four corners of the bottom of box with a net respectively is connected with a counter weight through the rope, per two adjacent boxes with a net share two floaters, be fixed with a dead lever on two floaters that two perpendicular to location rope's of every box with a net limit corresponds, two location rope voltage-sharing are on all dead levers.
In order to improve the oxygen content in seawater, the invention also comprises an oxygen charging pipe, the oxygen charging pipe and the positioning rope are arranged side by side, the oxygen charging pipe comprises a connecting section and an oxygen charging section, each net cage is provided with an oxygen charging section, the oxygen charging section is positioned below the floating plate, the oxygen charging section is provided with a plurality of upward oxygen charging holes, the distance between the oxygen charging holes and the floating plate is 20-30cm, the oxygen charging sections in adjacent net cages are connected through the connecting section, the connecting section spans the corresponding fixing rods, the connecting section and the fixing rods are connected through a connecting piece, the connecting piece comprises two elastic buckling grooves, the axes of the two buckling grooves are vertical, the middle parts of the two buckling grooves are fixed, the notches of the two buckling grooves are deviated, and the two buckling grooves are respectively buckled on the connecting section and the fixing rods.
In order to conveniently cultivate comparatively active marine products such as crabs and shrimps, a mesh enclosure is arranged below the oxygen filling pipe in the net cage.
The invention relates to an ecological breeding method for improving the yield of sea cucumbers, which adopts any one of the mariculture net cages, and the method comprises the following steps: the sea cucumber is cultured in a net cage; and (2) planting the American sea shoots in the fixed planting cup.
In order to further improve the yield of the sea cucumbers, the invention provides an ecological breeding method for improving the yield of the sea cucumbers, which adopts the seawater culture net cage, and the method comprises the following steps: (1) The sea cucumbers are cultured in a seawater net cage, the water temperature is 13-20 ℃ during the culture period, the salinity is 2.5-3.2%, the daily feeding amount of the sea cucumber bait is 1-5% of the weight of the sea cucumbers, the bait is fed once every day at the same time, the feeding amount is adjusted according to the residual food amount, the residual food exists in the third hour before the sea cucumber is fed every day, and the residual food does not exist in the two hours before the sea cucumber is fed every day; (2) Planting the American sea bamboo shoots in a planting cup, wherein the planted American sea bamboo shoots are seedlings growing for 40-50 days; introducing air into the net cage through an oxygen charging pipe to ensure that the dissolved oxygen in water is more than 5 mg/L, partially immersing the planting cup in seawater, spraying fertilizer to the ocean marine bamboo shoots every other week, and spraying the fertilizer at the evening to ensure that the entire ocean marine bamboo shoots are uniformly sprayed with moisture, wherein the fertilizer adopts gibberellin solution prepared from Hoagland nutrient solution, and the gibberellin content is 50mg/L.
The beneficial effects of the invention are: according to the invention, the floating plate and the planting cup for planting the western marine bamboo shoots are arranged in the net cage, the excrement of the marine products can provide nutrients for the western marine bamboo shoots, the growth of the western marine bamboo shoots can purify the water quality of seawater, the contents of COD, BOD, ammonia nitrogen and nitrite in the seawater can be effectively reduced, the growth environment of the marine products can be purified, the growth of the marine products is promoted, the western marine bamboo shoots are harvested, and the sea surface ornamental value is also achieved. The net cage is suitable for net cage culture of sea products such as sea cucumbers, abalones, crabs, shrimps and the like.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a sectional elevation view of the present invention;
FIG. 4 is an enlarged schematic view of the structure of the member 5 of the present invention;
FIG. 5 is a left side view of FIG. 4;
in the figure: 1. the oxygen-filling device comprises an oxygen-filling pipe, 2, a positioning rope, 3, a fixing rod, 4, a net cage, 5, a connecting piece, 6, a floating ball, 7, a balance weight, 8, a floating plate, 9, a planting cup, 10 and a net cover. 5-1, a first elastic buckle groove, 5-2 and a second elastic buckle groove.
Detailed Description
As shown in fig. 1, 2 and 3, the sea water aquaculture net cage comprises an oxygen charging pipe 1, a positioning rope 2, a fixing rod 3, a net cage 4, a connecting piece 5, a floating ball 6, a counterweight 7, a floating plate 8 and a planting cup 9.
The box with a net 4 has a plurality ofly, a plurality of box with a net are arranged into one row, location rope 2 has two, two setting side by side of location rope 2, the both ends anchor respectively of two location rope 2 is fixed subaquely, the four corners at the top of every box with a net 4 is provided with a floater 6, floater 6 supports in the below of location rope 2, the four corners of the bottom of box with a net 4 respectively is connected with a counter weight 7 through the rope, two floater 6 of per two adjacent box with a net 4 sharing, be fixed with a dead lever 3 on two floater 6 that two perpendicular to location rope 2's of every box with a net 4 limit corresponds, the pressure-sharing of two location rope 2 is on all dead levers 3. A floating plate 8 is arranged in the net cage 4, and a planting cup 9 for planting the western marine bamboo shoots is arranged on the floating plate 8.
The oxygen filling pipe 1 and the positioning rope 2 are arranged side by side, the oxygen filling pipe 1 comprises a connecting section and an oxygen filling section, one oxygen filling section is arranged in each net cage 4, the oxygen filling section is located below the floating plate 8, a plurality of oxygen filling holes are formed in the oxygen filling section, the oxygen filling holes face upwards, the oxygen filling hole distance is 20-30cm from the floating plate, the oxygen filling sections in the adjacent net cages 4 are connected through the connecting section, the connecting section spans the corresponding fixing rods 3, and the connecting section is connected with the fixing rods through the connecting piece 5. A mesh enclosure 10 is arranged below the oxygen charging pipe 1 in the net cage 4. The net cage 4 with the net cover 10 can be used for breeding comparatively active marine products such as crabs, shrimps and the like.
As shown in fig. 4 and 5, the connecting member 5 includes a first elastic fastening groove 5-1 and a second elastic fastening groove 5-2, the axes of the first elastic fastening groove 5-1 and the second elastic fastening groove 5-2 are perpendicular to each other, the middle portions of the first elastic fastening groove 5-1 and the second elastic fastening groove 5-2 are fixed to each other, the notches of the first elastic fastening groove 5-1 and the second elastic fastening groove 5-2 are deviated from each other, and the first elastic fastening groove 5-1 and the second elastic fastening groove 5-2 are respectively fastened to the connecting section and the fixing rod.
A biological method for increasing the yield of sea cucumbers cultured in net cages adopts the seawater culture net cages shown in figures 1-3, and the method comprises the following steps:
(1) The sea cucumber is cultured in a net cage with the sea water capacity of L and the area of S, the sea cucumber feeding amount is N heads per cubic meter of sea water, the size of the fed sea cucumber seedlings is 1000 heads per kilogram, the water temperature is 13-20 ℃ during culture, the salinity is 2.5-3.2%, and the daily feeding amount of sea cucumber baits is 1-5% of the weight of the sea cucumber. The bait is thrown once every day at the same time, the feeding amount is adjusted according to the residual food amount, the residual food exists in the third hour before the bait is thrown every day, and the residual food does not exist in the second hour before the bait is thrown every day.
(2) Planting the American sea shoots in a planting cup at a planting density of M, wherein the planted American sea shoots are seedlings growing for 40-50 days; introducing air into the net cage through an aeration pipe to ensure that the dissolved oxygen in water is more than 5 mg/L, partially immersing the planting cup in seawater, spraying fertilizer on the western ocean bamboo shoots every other week, and spraying at the evening to ensure that the whole plants of the western ocean bamboo shoots are uniformly wetted.
(3) The sea cucumber throwing and the western sea bamboo shoot planting are carried out on the same day. After 60 days: the survival rate of the sea cucumbers is X, the average weight of the sea cucumbers is Y times of the average weight of the sea cucumbers when the sea cucumbers are put into the sea cucumbers, the COD concentration in the sea cucumbers is a, the BOD concentration in the sea cucumbers is b, the ammonia nitrogen concentration in the sea cucumbers is c, and the nitrite concentration in the sea cucumbers is d. The average fresh weight of each plant of the overground part of the western sea bamboo shoots is e. The aerial parts of the marine shoots are parts except roots.
The fertilizer for spraying the western marine bamboo shoots can be selected from the following fertilizers:
a first fertilizer: and (4) distilled water.
And (2) fertilizer II: hoagland nutrient solution prepared from distilled water.
And (3) fertilizer III: the gibberellin content of the gibberellin solution prepared from the Hoagland nutrient solution is 50mg/L.
In table 1, the first embodiment, the second embodiment and the third embodiment are implementation data of three specific embodiments using the above method.
In the fourth embodiment, the sunshade net is arranged on the net cage, the floating plate and the planting cup are not arranged, the western marine bamboo shoots are not planted in a fixed mode, and other methods are the same as the above method.
TABLE 1
| Example one | Example two | EXAMPLE III | Example four | |
| L (cubic rice) | 6 | 6 | 6 | 6 |
| S (Square meter) | 6 | 6 | 6 | 6 |
| N (head) | 1000 | 1000 | 1000 | 1000 |
| M (plant/square meter) | 81 | 81 | 81 | 81 |
| Ｘ(%) | 67 | 69 | 71 | 52 |
| Ｙ | 1.51 | 1.53 | 1.71 | 1.40 |
| a (mg/L) | 2.01 | 1.96 | 1.76 | 2.31 |
| b (mg/L) | 0.98 | 0.90 | 0.81 | 1.20 |
| c (mg/L) | 0.41 | 0.37 | 0.35 | 0.51 |
| d (mg/L) | 0.08 | 0.07 | 0.05 | 0.11 |
| e(kg) | 0.68 | 0.73 | 0.81 | |
| Fertilizer | Fertilizer 1 | Fertilizer II | Fertilizer III |
Claims (2)
1. An ecological breeding method for improving the yield of sea cucumbers is characterized by comprising the following steps: adopt ecological mariculture box with a net, including box with a net positioner and the box with a net of setting on box with a net positioner, the box with a net top surface is uncovered and is located the surface of water top, its characterized in that: the net cage is internally provided with a floating plate, the floating plate is provided with a plurality of the western sea bamboo shoot planting cups, and the method comprises the following steps: (1) Culturing sea cucumbers in a seawater net cage, wherein the water temperature is 13-20 ℃, the salinity is 2.5-3.2% during culturing, the daily feeding amount of sea cucumber bait is 1-5% of the weight of the sea cucumbers, the bait is fed once every day at the same time, the feeding amount is adjusted according to the residual food amount, residual food exists in the third hour before the sea cucumbers are fed every day, and no residual food exists in the second hour before the sea cucumbers are fed every day; (2) Planting the American sea bamboo shoots in a planting cup, wherein the planted American sea bamboo shoots are seedlings growing for 40-50 days; introducing air into the net cages through the oxygen filling pipes to enable dissolved oxygen in water to be more than 5 mg/L, partially immersing the planting cups in seawater, spraying fertilizer on the western ocean bamboo shoots every other week, and spraying at the evening to ensure that the whole plants of the western ocean bamboo shoots are uniformly wetted, wherein the fertilizer is a gibberellin solution prepared from Hoagland nutrient solution, the gibberellin content is 50mg/L, a plurality of net cages are arranged in a row, the net cage positioning device comprises two positioning ropes and a plurality of floating balls, the two positioning ropes are arranged side by side, two ends of each positioning rope are respectively anchored and fixed at the bottom of the water, four corners of the top of each net cage are provided with one floating ball, the floating balls are supported below the positioning ropes, four corners of the bottom of each net cage are respectively connected with a balance weight through ropes, and every two adjacent net cages share two floating balls, the oxygen charging device comprises two floating balls, wherein the two floating balls correspond to the edges of two positioning ropes of each net cage, the two positioning ropes are uniformly pressurized on all the fixed rods, the oxygen charging device further comprises an oxygen charging pipe, the oxygen charging pipe and the positioning ropes are arranged side by side, the oxygen charging pipe comprises a connecting section and an oxygen charging section, one oxygen charging section is arranged in each net cage, the oxygen charging section is positioned below the floating plate, a plurality of upward oxygen charging holes are formed in the oxygen charging section, the oxygen charging holes are 20-30cm away from the floating plate, the oxygen charging sections in adjacent net cages are connected through the connecting section, the connecting section spans the corresponding fixed rods, the connecting section is connected with the fixed rods through connecting pieces, each connecting piece comprises two elastic buckling grooves, the axes of the two buckling grooves are perpendicular to each other, the middle parts of the two buckling grooves are fixed, the notches of the two buckling grooves deviate from each other, and the two buckling grooves are buckled on the connecting section and the fixed rods respectively.
2. The ecological breeding method for improving the yield of sea cucumbers according to claim 1, wherein the ecological breeding method comprises the following steps: and a mesh enclosure is arranged below the oxygen filling pipe in the mesh cage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710779891.9A CN107517907B (en) | 2017-09-01 | 2017-09-01 | Ecological breeding method for improving sea cucumber yield |
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| CN201710779891.9A CN107517907B (en) | 2017-09-01 | 2017-09-01 | Ecological breeding method for improving sea cucumber yield |
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| CN107517907A CN107517907A (en) | 2017-12-29 |
| CN107517907B true CN107517907B (en) | 2023-04-14 |
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|---|---|---|---|---|
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| CN204070056U (en) * | 2014-09-26 | 2015-01-07 | 上海海洋大学 | A kind of algae fish mixed breed net cage |
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| CN106386579A (en) * | 2016-08-31 | 2017-02-15 | 山东东方海洋科技股份有限公司 | Method for sea anemone culture in pond |
| CN106614148A (en) * | 2017-01-24 | 2017-05-10 | 河南师范大学 | Fish-vegetable symbiotic type ecological floating bed and raising method thereof |
| CN207125157U (en) * | 2017-09-01 | 2018-03-23 | 山东海水蔬菜科技开发有限公司 | Ecological seawater aquaculture net cage |
-
2017
- 2017-09-01 CN CN201710779891.9A patent/CN107517907B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02249433A (en) * | 1989-03-23 | 1990-10-05 | Kyushu Sekisui Kogyo Kk | Rearing and culturing cage for abalone, sea urchin or the like |
| KR100796120B1 (en) * | 2007-06-29 | 2008-01-21 | 문창영 | Submersible cage facility for fish culture |
| CN102726331A (en) * | 2012-07-11 | 2012-10-17 | 福州市海洋与渔业技术中心 | Net-cage stereo ecological breeding method of abalone, sea cucumber and algae |
| CN204070056U (en) * | 2014-09-26 | 2015-01-07 | 上海海洋大学 | A kind of algae fish mixed breed net cage |
| CN104365528A (en) * | 2014-11-28 | 2015-02-25 | 通威股份有限公司 | Box-type fish and vegetable mutualism breeding system |
| CN104663552A (en) * | 2015-03-23 | 2015-06-03 | 中国水产科学研究院黄海水产研究所 | Ecological remediation type marine ranch and construction method for same |
| CN106386579A (en) * | 2016-08-31 | 2017-02-15 | 山东东方海洋科技股份有限公司 | Method for sea anemone culture in pond |
| CN106614148A (en) * | 2017-01-24 | 2017-05-10 | 河南师范大学 | Fish-vegetable symbiotic type ecological floating bed and raising method thereof |
| CN207125157U (en) * | 2017-09-01 | 2018-03-23 | 山东海水蔬菜科技开发有限公司 | Ecological seawater aquaculture net cage |
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| CN107517907A (en) | 2017-12-29 |
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