KR102382732B1 - Cultivating Facility Including Inclosed Net and Method for Installing Thereof - Google Patents

Abstract

The present invention relates to an offshore aquaculture cage facility and a method of installing the facility, and the offshore cage cage facility according to an embodiment of the present invention is a fixed jacket structure fixed to the bottom of the sea and partially exposed to the sea, a fixed jacket structure At least one offshore cage for cultivating living things, a rotating device that connects the offshore cage to a fixed jacket structure, and rotates the offshore cage in the direction in which an external force is generated on the offshore cage, food that supplies food to the offshore cage It is installed on the exposed part of the sea of the supply device and the fixed jacket structure, it may include a control device for controlling the food supply by controlling the food supply device based on the state of the sea or the sea around the sea cage.

Description

Cultivating Facility Including Including Inclosed Net and Method for Installing Thereof

The present invention relates to a marine aquaculture cage facility and a method of installing the facility, and more particularly, by installing a culture cage for cultivating living things in the open sea, and depending on the sea condition, operations such as movement of the cage or feeding can be easily performed It relates to a marine aquaculture cage facility and a method of installing the facility.

In general, cage aquaculture is a fish production method in which the fish in the fry stage are raised as the fish in the adult stage while confining the fish in a certain space made of a net and supplying feed. These types of cage culture include a stock-breeding-type cage culture, a tinmock-type offshore (offshore) cage culture, and a sea station-type offshore cage culture. This cage culture is widely used because it is easy to supply feed and observe the growth state by culturing a large number of fish in a narrow space. The cage aquaculture facility according to the prior art forms a space in which the farmed fish is accommodated with a net under the frame to which the buoy is fastened, and then the frame and the seabed are fixed using a rope, etc. so that it is always located on the water surface. .

However, because the conventional cage facilities are always located on the water surface, they are more affected by waves and currents near the water surface than at the deep water. And there is a problem that the form is not easy.

Korean Patent Publication No. 10-0885630 (2009.02.19) Korean Patent Publication No. 10-0973512 (2010.07.27) Korean Patent Publication No. 10-0888927 (2009.03.10) Korean Patent Publication No. 10-1172032 (2012.08.01) Korea Patent Publication No. 10-2012-0025805 (2012.03.16) Korean Patent Publication No. 10-2014-0046497 (2014.04.12) Korean Patent Publication No. 10-2016-0074367 (2016.06.28)

An embodiment of the present invention provides, for example, an offshore aquaculture cage facility and a method of installing the facility, in which, for example, an aquaculture cage for cultivating living things is installed in the open sea, and operations such as movement of the cage or food supply can be easily performed depending on the sea condition. There is a purpose.

The marine aquaculture cage facility according to an embodiment of the present invention includes a fixed jacket structure fixed to the bottom of the ocean and partially exposed to the sea, at least one offshore cage positioned around the fixed jacket structure to culture organisms, the A rotating device that connects an offshore cage to the fixed jacket structure and rotates the offshore cage in a direction in which an external force is generated in the offshore cage, a food supply device that supplies food to the offshore cage, and sea exposure of the fixed jacket structure It is installed on the site, and includes a control device for controlling the food supply by controlling the food supply device based on the state of the surrounding sea or ocean of the sea cage.

The offshore confinement, a floating body that is located on the upper portion of the marine fringe to generate buoyancy, a lower support structure located below the offshore boundary, and connects the floating body and the lower support structure, by the control device It may include a volume control line to control the volume in the net of the marine perimeter.

The marine aquaculture cage facility may further include an external force drog installed on one side of the floating body to help the stable rotation of the offshore cage rotated by the external force.

The external force drog may be increased in size in proportion to the number of the series connected when a plurality of sea troughs are connected in series based on the fixed jacket structure.

The marine aquaculture cage facility may further include a marine observation device for observing the state of the ocean in the vicinity of the offshore cage, and a submarine cable for providing the observed state data of the ocean to the control device.

The food supply device includes a plurality of food supply pipes installed on the marine cage, and the control device controls at least one pipe among the plurality of food supply pipes based on the ocean or sea state to feed can supply

When a plurality of offshore cages are installed so as to surround the fixed jacket structure, the marine aquaculture cage facility is provided on one side of a mooring line respectively connected to the outside of the plurality of offshore cages, and the mooring ship is fixed to the bottom surface of the ocean It may further include an anchor to be.

The food supply device may include a submarine pipe installed on the bottom of the sea, a food supply riser provided on one side of the submarine pipe and respectively provided below the plurality of sea cages, and a food supply from one side of the food supply riser It may include an automatic direction adjustment device that is rotatably installed to adjust the direction.

In addition, the marine aquaculture cage facility according to another embodiment of the present invention is a fixed jacket structure that is fixed to the bottom of the sea and partially exposed to the sea, and at least one of at least one located around the fixed jacket structure to culture organisms A first frame connected to the fixed jacket structure and horizontally disposed on the floor surface, the first frame connected to the fixed jacket structure and horizontally with the first frame at a specified distance and provided on the upper side a second frame, a first inclined frame connected to the fixed jacket structure to inclinedly support the second frame, a plurality of second inclined frames connected to each other to be inclinedly disposed, and the It is supported on the floor and includes a ground support frame for maintaining the first frame at a specified distance.

Furthermore, the method of installing a marine aquaculture cage facility according to an embodiment of the present invention includes the steps of exposing a part of the fixed jacket structure to the sea and fixing it to the bottom of the sea, at least one of culturing living things around the fixed jacket structure locating a sea cage of, connecting the offshore cage to the fixed jacket structure by a rotating device to rotate the offshore cage in a direction in which an external force is generated in the offshore cage, feeding food to the offshore cage Installing a food supply device, and controlling the food supply device based on the state of the sea or the sea around the sea cage to control the food supply. Installing a control device on the exposed part of the sea of the fixed jacket structure. include

According to the present invention having the configuration as described above, the following effects can be achieved.

According to an embodiment of the present invention, when waves, currents, and wind act, it will be possible to safely protect the guard facilities by allowing the marine guard to rotate freely in the direction of the load and to face the direction in which the external force is minimized.

In addition, the embodiment of the present invention can move the marine cage to a safe place when bad weather conditions such as red tide, typhoon, high temperature, etc. during operation of the cage are necessary during the invasion of moisture.

Furthermore, in the embodiment of the present invention, in consideration of the marine environmental characteristics around the sea girth, the aquaculture can be balanced by adjusting the food supply according to the direction of the birds.

1 is a view of a marine aquaculture cage facility according to a first embodiment of the present invention;
Figure 2 is a view for explaining the feeding operation of the facility of Figure 1;
Figure 3 is a view for explaining the volume control operation of the facility of Figure 1;
4 is a view of a marine aquaculture cage facility according to a second embodiment of the present invention;
5 is a view of a marine aquaculture cage facility according to a third embodiment of the present invention;
6 is a view of a peddle culture cage facility according to a fourth embodiment of the present invention;
7 is a view illustrating a plan view of the culture cage shown in FIG. 6, and
8 is a flowchart illustrating an installation process of a marine aquaculture cage facility according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms. In the present specification, the present embodiment is provided to complete the disclosure of the present invention, and to fully inform those of ordinary skill in the art to which the present invention pertains to the scope of the invention. And the invention is only defined by the scope of the claims. Accordingly, in some embodiments, well-known components, well-known operations, and well-known techniques have not been specifically described to avoid obscuring the present invention.

In addition, like reference numerals refer to like elements throughout the specification, and terms used (referred to) in this specification are for the purpose of describing the embodiments and are not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase, and elements and operations referred to as 'comprising (or having)' do not exclude the presence or addition of one or more other elements and operations. . Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not ideally or excessively interpreted unless they are defined.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view of a marine aquaculture cage facility according to a first embodiment of the present invention, FIG. 2 is a view for explaining the feeding operation of the offshore cage of the facility of FIG. 1, and FIG. 3 is an offshore cage of the facility of FIG. It is a diagram for explaining the volume control operation of the.

As shown in Figure 1, the marine aquaculture cage facility 100 according to an embodiment of the present invention is a fixed jacket structure 111, rotating devices 113, 121, offshore cage 131, external force drag 141) and a part or all of the ocean observation device 181 .

Here, including "part or all" means that the external force drog 141 or the marine observation device 181 is omitted to configure the cage facility 100, or some components such as the external force drogue 141 are offshore cages. (131), which means that it can be configured by being integrated with other components, etc., will be described as including all in order to help a sufficient understanding of the invention.

The fixed jacket structure 111 is fixed to the bottom surface of the ocean and corresponds to a jacket-type structure in which a part is exposed outside the ocean. In an embodiment of the present invention, the fixed jacket structure 111 may be referred to as a jacket-type fixed structure. The jacket type is one of the fixed methods of offshore plant foundation structures. The jacket structure is a structure in which a pile, that is, a pile, is driven into the seabed and a deck (eg, horizontal and inclined reinforcement, etc.) is raised on the jacket. It is a structure that can support wind, wave load, and its own weight as a huge pile is embedded in the seabed. The size and construction cost of the jacket structure rapidly increases with water depth, so the current limit of about 400m is the current limit. However, the size of the fixed jacket structure 111 according to the embodiment of the present invention may be adjusted depending on how the marine boundary 131 is configured and connected to the fixed jacket structure 111 and operated.

The marine cage 131 may have various shapes, such as a circle, a square, etc., and a floating body 132, a lower support structure 133, a net 134, a volume control line 161, and a food supply device 191, etc. may include The floating body 132 may be formed in any shape as long as it can have buoyancy like a buoy, and a (wire) rope 142, etc. penetrates into it, and supplies food to the inside of the marine cage 131. A food supply device 191 for this may be provided therein. It can be seen that the floating body 132 and the lower support structure 133 are connected to the net 134 and the volume control line 161 . In order to adjust the volume of the net 134 of the marine confinement 131, the lower support structure 133 is provided with a volume control line 161 so that the position can be moved.

As can be seen in FIG. 3, the volume control line 161 is the volume control line 161 when it is necessary to move the marine cage 131 when bad weather conditions such as red tide, typhoon, high temperature, etc. Adjust to reduce the height of the sea edge 131, and to move and reinstall. In particular, when a typhoon invades and it is necessary to move the marine cage 131 to the bay, since the water depth of the bay is not deep, it is necessary to temporarily reduce the height of the cage to operate it in the bay. This is very important. Here, the volume control line 161 is made of a wire rope or a PP (Polypropylene) rope, and the electricity required to reduce the rope length is supplied through a motor (not shown) installed in the floating body 132 . For example, the principle of a pulley that winds and unwinds the volume control line 161 for volume control may be applied. When adjusting the length of the rope in order to move the sea edge 131, the control system installed in the central upper structure 171, that is, the control device issues an operation command (or control command). After the height of the edge is reduced, it is towed by the vessel 162, and the towing rope 163 is connected and moved.

The food supply device 191 may include a pump and a food supply pipe. The food supply pipe starts from the central upper structure 171 and is connected to the connecting support 121 through the floating body 132 of the offshore cage 131, for example, as shown in 2, it can be installed in eight directions. . Of course, the installation method and number of installations can be adjusted as much as possible. A total of eight are located in eight directions on the floating body 132 of the marine cage 131, and the food supply is controlled according to the direction of the birds. Since tidal current means the flow of seawater that occurs periodically due to ebb and flow, the central upper structure 171 analyzes the tidal data obtained through observation of the marine environment in the control device, for example, and analyzes the main tidal direction and flow velocity, and this data by operating the pump inside the central upper structure 171 to supply food. Since the pump controls the amount of feed through pumping, in order to control the amount of feed, it may be possible to control the amount of feed by installing a valve on the feed pipe and electronically controlling it. When the algae is weak, food is supplied from all directions, whereas, for example, when the algae is strong in a specific direction, food is controlled to be supplied from the food supply pipe located in the opposite direction. Both the strength and direction of the pump can be controlled. 2, A indicates the direction of the bird, and B indicates the direction in which food is supplied through the food supply pipe.

When waves, currents, and wind act, the offshore cage 131 rotates freely in the direction in which the load acts, and is directed in the direction in which the external force is minimized. An external force drog 141 is installed on one side of the periphery of the offshore cage 131 so that the offshore cage 131 rotates better according to the external force, and the external force drog 141 has a surface area and The volume is relatively large. The external force drag 141 and the sea rim 131 are connected by a light rope 142 .

The upper part of the fixed jacket structure 111, more precisely, a central upper structure 171 provided with a part of the food supply device 191, a data storage and control system, that is, a control device, etc. is mounted on a portion exposed to the outside of the ocean. The control device configured in the central upper structure 171 collects, for example, the measurement data of the ocean observation device 181 installed near the marine cage 131 and analyzes the collected data, and based on the analysis result, the food supply device The volume control line 161 of 191 and the like can be controlled. For example, the control device can control the supply of food from the food supply pipe in the opposite direction to the direction of the bird as mentioned above, and adjust the operation cycle of the pump according to the strength of the bird to adjust the supply amount and direction of the food. will be able

A marine observing device 181 is installed on the seafloor around the sea cage 131 . The ocean observation device 181 is equipped with a small photographing device such as a camera or a sensor to observe waves and currents, and transmits information to the central superstructure 171 through the submarine cable 182 . The central superstructure 171 collects and analyzes data to interpret the characteristics of the surrounding marine environment. In particular, it automatically controls the feeding by accurately analyzing the direction and strength of birds. Of course, various data such as meteorological data from a meteorological station may be used to observe a marine environment in the sea or underwater. For example, if weather information such as a typhoon may be involved in the operation of the volume control line 161 , the data of the underwater ocean observation device 181 may be related to food supply. Therefore, the embodiment of the present invention will not specifically limit which data is used. For example, at the government level, a marine network (e.g., consisting of an underwater data sink and multiple sensors communicating around it) can be configured at the government level to collect and utilize a lot of marine information through the underwater sensors, It may also be possible to receive and use data provided. Moreover, by configuring the central superstructure 171 to enable wireless communication, an automatic operation for observing the ocean state may be possible.

For example, in recent years, since deep learning technology using artificial intelligence has been developed a lot, the control device analyzes the collected big data to predict the effect on the offshore cage 131 in advance, and to the manager of the offshore cage 131 . You can notify us so that appropriate action can be taken. For example, it may be possible to continuously collect data in relation to the offshore cage 131, and as the data collected increases over the years, efficient and safe operation of the offshore cage 131 using big data and artificial intelligence may be possible.

4 is a view of a marine aquaculture cage facility according to a second embodiment of the present invention.

As shown in FIG. 4 , the marine aspect guard facility 200 according to the second embodiment of the present invention is efficiently configured by connecting a plurality of floating marine guards 131 to the fixed jacket structure 111 in series. As an aquaculture cage system, it includes a fixed jacket structure 111, a rotating device 113, 121, a plurality of offshore cages connected in series with each other (131A, 131B, 131C), some or all of the external force drog 141, , "including some or all" herein has the same meaning as above.

Compared with the marine aquaculture cage facility 100 of FIG. 1, the marine aquaculture cage facility 200 of FIG. 4 has a difference in that a plurality of offshore cages (131A, 131B, 131C) can be connected in series with each other. can see. Here, "connected in series" means that the second sea bound 131B is connected to the first sea bound 131A based on the fixed jacket structure 111, and the third sea bound again to the second sea bound 131B. (131C) means a structure that is connected.

When configured in this way, when there are many offshore guards (131A, 131B, 131C), using a light rope 142 to connect the guards (131A, 131B, 131C), the size of the external force drag 141 receiving an external force also increases In other words, the connection between the offshore cages (131A, 131B, 131C) is connected by a rope 142, and above all, the external force drag 141 provided on one side of the third offshore cage (131C) located at the outermost part is shown in Fig. Compared to 1, the size is gradually increased in proportion to the number of sea borders (131A, 131B, 131C) connected. This is because the offshore cages (131A, 131B, 131C) positioned between the fixed jacket structure 111 and the external force drag 141 are floated on the sea level by the floating body 132, but compared to FIG. Since a larger external force (eg, gravity) is generated in (131A, 131B, 131C), the size of the external force drog 141 is increased in consideration of this. The larger the area, the greater the external force, so this can be considered.

Except for the same points as described above, the detailed information related to the marine aquaculture cage facility 200 of FIG. 4 is not significantly different from the contents of the marine aquaculture cage facility 100 of FIG.

5 is a view of a marine aquaculture cage facility according to a third embodiment of the present invention.

As shown in FIG. 5 , the marine aspect guarding facility 300 according to the third embodiment of the present invention is a method for efficient management, and a plurality of fixed jacket structures 111 and the central upper structure 171 are located around. A plurality of sea guards (131A, 131B) in the form of surrounding a fixed jacket structure (111), a rotating device (113, 121), a fixed jacket structure (111), It includes some or all of the feeding (piping) devices 151 to 153 and the anchor devices 155 and 156 that are built into the bottom surface of the water, where "includes part or all" is the same as the previous meaning. .

As can be seen in (a) and (b) of Figure 5, a plurality of the sea edge (131A, 131B) is connected to the fixed jacket structure 111 using the connection support bar 121 to maintain the position. . On the other hand, the floating body 132 of the offshore boundary (131A, 132B) is supported by using the mooring line 155 and the anchor 156 on the outside of the fixed jacket structure (111). While the food for aquaculture is stored inside the central superstructure 171, the automatic feeding inside the cage through the riser system (or riser device) 151, the subsea pipe 152 and the feeding riser 153 is automatic. do. Although different subsea pipes 152 can be configured to provide food, a plurality of subsea pipes 152 classified in one riser system 151 for automatic feeding are constituted, and each subsea pipe 152 is configured. Control the supply path to the A valve or switch may be configured at the entrance of each subsea pipe 152 classified as a representative, and this may be controlled.

Since food should be automatically supplied by monitoring and analyzing the state of the farmed fish, an underwater camera (not shown) may be further positioned inside the marine cages 131A and 131B. By analyzing the current flow state around the sea cages (131A, 131B) through the maritime monitoring system, it controls so that food is supplied in the opposite direction to the current flow direction.

At the end of the food supply riser 153, a device capable of rotating the food supply automatic direction adjustment device 154 in a 360 degree direction may be installed so as to control the direction in which the food is supplied. This is controlled by the central upper structure 171 to supply food, and the supply of food is made by a pump, and the strength of the pump is determined according to the size of the algae. Control of the automatic feeding direction control device 154 may be possible by controlling the motor after connecting the rotary gear to the drive shaft of the motor.

Except for the above, the marine aquaculture cage facility 300 of FIG. 5 is not much different from the marine aquaculture cage facility 100 of FIG. 1, so it will be replaced with the contents.

6 is a view of a marine aquaculture cage facility according to a fourth embodiment of the present invention, and FIG. 7 is a view illustrating a plane of the offshore cage shown in FIG. 6 .

As shown in FIG. 6 , the marine aquaculture cage facility 400 according to the fourth embodiment of the present invention installs a fixed jacket structure 111 in the medium or large water depth in order to construct a super-large offshore cage, as much as possible. A frame-type structure is installed to minimize external forces such as waves while forming a large volume.

The frame structure is connected to a pipe to form a structure. Frames 601 to 606 minimize the load by installing the inclined frame 601 around the sea level where the wave load is large. The main frame 602 is installed from the bottom by a certain depth from the sea level and connected to the vicinity of the sea floor. At this time, the main frame 602 has an inclination in order to increase the safety of conduction by external force. The main frame 602 is connected to the horizontal frame 604 near the bottom of the sea.

The ground support frame 606 is installed in order to position the edge frame away from the sea floor by a certain height, and the ground support frame 606 is installed at an appropriate number of appropriate positions by examining the structural safety of the structure.

A horizontal material frame 603 for maintaining the volume even near the sea level is installed, which is located below a certain depth so as not to receive a large wave load.

In order to improve the overall structural safety of other structures, the inclined material frame 605 is installed.

The above-described inclined frame 601 , the main frame 602 , the horizontal material frame 603 , etc. may be referred to as first, second, and third frames, etc. in the embodiment of the present invention.

Except for the above, the marine aquaculture cage facility 400 of FIG. 6 is not significantly different from the offshore culture cage facility 100 of FIG.

8 is a flowchart illustrating an installation process of a marine aquaculture cage facility according to an embodiment of the present invention.

Referring to FIG. 8 together with FIG. 1 for convenience of explanation, the marine aquaculture cage 100 according to an embodiment of the present invention exposes a part of the fixed jacket structure 1111 to the sea and fixes it to the bottom of the sea (S800) ).

In addition, at least one marine cage 131 for cultivating living things is positioned around the fixed jacket structure 1111 (S810). The located sea edge 131 may be configured in various forms as described above, for example, in the form of the first to fourth embodiments, depending on what form it is configured in.

Next, the offshore cage 131 is connected to the fixed jacket structure 111 by the rotating devices 113 and 121 so as to rotate the offshore cage 131 in the direction in which an external force is generated in the offshore cage 131 (S820). ). When the rotary swivel 113 performing the role of the rotor is fastened to the fixed jacket structure 111 , the connecting support bar 121 is connected to the rotary swivel 113 , and the other side is connected to the marine cage 131 .

In addition, a food supply device 191 for supplying food to the marine cage 131 is installed (S830). Even in the case of the food supply device 191, an appropriate method may be selected and installed according to the form in which the marine guard 131 is installed. Above all, it is clear that the food supply device 191 should be installed so that the supply of food is controlled based on the surrounding sea or sea conditions of the sea cage 131 .

Furthermore, a control device is installed on the exposed part of the sea of the fixed jacket structure 111 to control the food supply 191 based on the state of the sea or the sea around the sea cage 131 to adjust the food supply (S840) . The control device may be provided inside the central upper structure 171 mounted on the exposed portion of the fixed jacket structure 111 .

In addition to the above, the offshore guarding facilities 100 to 400 according to an embodiment of the present invention have been sufficiently described through the previous embodiment, so the detailed content will be replaced with the contents.

And, within the scope of the basic technical spirit of the present invention, many other modifications and applications are also possible for those of ordinary skill in the art.

111: fixed jacket structure 113: rotary swivel
121: connection support bar 131: aquaculture edge
132: floating body 133: lower support structure
134: net 141: external force drog
142: rope 171: central superstructure
181: marine observation device 182: submarine cable
191: feeding device 151: riser system for automatic feeding
152: subsea pipe 153: feed riser
154: food supply automatic direction control device

Claims (10)

a fixed jacket structure fixed to the bottom of the ocean and partially exposed to the ocean;
at least one marine cage positioned around the fixed jacket structure for cultivating living things;
a rotating device connecting the offshore cage to the fixed jacket structure and rotating the offshore cage in a direction in which an external force is generated in the offshore cage;
a food supply device for supplying food to the marine cage; and
A control device installed in the sea exposed portion of the fixed jacket structure and controlling the food supply by controlling the food supply device based on the state of the sea or the sea around the sea cage; includes;
The marine confinement, a floating body located on the upper portion of the marine confinement to generate buoyancy; a lower support structure located below the sea edge; and a volume control line connecting the floating body and the lower support structure, and controlled by the control device to adjust the volume in the net of the marine confinement.
An external force drog installed on one side of the floating body to help the stable rotation of the offshore cage rotated by the external force; Marine aquaculture cage facility comprising a further.
delete delete The method of claim 1,
The external force drog, when a plurality of offshore cages are connected in series based on the fixed jacket structure, the size of the marine aquaculture cage increases in proportion to the number of the serially connected cages.
The method of claim 1,
an ocean observation device for observing the state of the ocean in the vicinity of the ocean boundary; and
A submarine cable for providing the observed state data of the ocean to the control device;
including marine aquaculture cages.
The method of claim 1,
The food supply device includes a plurality of food supply pipes installed on the sea cage,
The control device is a marine aquaculture cage facility for supplying food by controlling at least one of the plurality of food supply pipes based on the sea or sea state.
The method of claim 1,
When a plurality of offshore cages are installed to surround the fixed jacket structure, a mooring line respectively connected to the outside of the plurality of offshore cages; and
An anchor provided on one side of the mooring line and fixed to the bottom of the ocean; and
Marine aquaculture cage equipment further comprising.
8. The method of claim 7,
The food supply device,
a submarine pipe installed on the bottom surface of the sea;
a food supply riser provided on one side of the subsea pipe and provided on the lower side of the plurality of sea cages, respectively; and
An automatic direction control device rotatably installed to control the feeding direction at one side of the feeding riser.
including marine aquaculture cages.
delete delete

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