CN115720878A - Batch grading catching device for large-scale net cage cultured fishes and using method - Google Patents
Batch grading catching device for large-scale net cage cultured fishes and using method Download PDFInfo
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- CN115720878A CN115720878A CN202211440778.5A CN202211440778A CN115720878A CN 115720878 A CN115720878 A CN 115720878A CN 202211440778 A CN202211440778 A CN 202211440778A CN 115720878 A CN115720878 A CN 115720878A
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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
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- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Abstract
The invention provides a batch grading catching device for cultured fishes in a large net cage, which relates to the technical field of catching devices in fishery and comprises the large net cage and also comprises: the small lifting type fish lifting net cage is characterized in that a fish catching opening is formed in the top of the small lifting type fish lifting net cage, an inflatable gravity sinking and floating structure is arranged at the bottom of the small lifting type fish lifting net cage, and the inflatable gravity sinking and floating structure drives a net of the small lifting type fish lifting net cage to float upwards or sink downwards; the fish passing channel is horizontally arranged between the large-scale aquaculture net cage and the small lifting type fish lifting net cage and comprises a left channel and a right channel which are detachably and fixedly connected; the left side channel is connected with the small lifting type fish lifting net cage in a sewing mode, and a closing device is arranged at a position close to the small lifting type fish lifting net cage; the right side channel is connected with the large-scale aquaculture net cage in a sewing way, and a closing-in device is arranged at a position close to the large-scale aquaculture net cage; the fish grading grid is vertically arranged in the left channel and is detachably and fixedly connected with the left channel. After the device is operated according to the using method, the ratio of fish to water in the net cage is greatly improved, and the fishing is convenient.
Description
Technical Field
The invention relates to the technical field of fishery fishing devices, in particular to a batch grading fishing device for large-scale net cage cultured fishes and a using method thereof.
Background
With the rapid development of the marine aquaculture industry in China, a series of problems such as industrial conflict, ecological hazard, disease risk, quality safety and the like are brought by offshore large-scale marine aquaculture. Therefore, the expansion of the mariculture industry from offshore to offshore and deep open sea has become a necessary trend for the development of the mariculture industry in China.
As cage culture is more and more offshore, the water depth and sea state level are also increased, the volume of the cage for culture is larger, and the capture technology of cultured fishes is a concern. The prior cage culture fish catching technology frequently adopted by people comprises net spreading catching, purse net catching in a cage, netting pulling catching and the like, and the catching modes have the advantages of simplicity and high labor power. The Wuhan vessel is heavily worked by using a mechanical driving and lifting method for a semi-submersible type steel frame structure net cage constructed in Norway; the deep blue No. 1 fully submerged net cage in China adopts a floating box fishing technology. The fishing techniques of these latter two cages are too complex. And the whole fishing system needs to be started for fishing part of fishes, so that certain damage is caused to the cultured fishes which are not planned to be fished.
At present, a simple mechanized batch fishing device is urgently needed at home and abroad. For example, the invention with the publication number of CN109221036B discloses a device for catching and culturing fishes in batches for a giant net cage, which consists of four parts, namely a bottom pocket, a bottom pocket lifting rope, an upper cover and a guide steel rope. The bottom pocket consists of three parts, namely an extension wing net, a classification area and a fish collection box, and has the main functions of containing the gathered fishes and enabling the fishes with small specifications to escape; the bottom pocket lifting rope is made of steel cables or ropes, and has the main function of lifting the bottom pocket to or from the water surface; the upper cover consists of an upper cover frame and an upper cover net and has the main function of repelling and gathering cultured fishes; the guiding steel cable consists of 2 or more steel cables and has the main function of accurately buckling the upper cover on the bottom pocket during fishing. The device solves the problems of daily multiple fishing, specification fishing and different water layers fishing which are urgently needed in giant net cage culture, and has the advantages of simple and convenient use and operation, labor saving and the like.
The novel fishing device is used in a huge net cage, and is also complex in the whole operation process when in use, the mechanical automatic operation is adopted during fishing, so that fish groups originally existing in the net cage can be damaged, the fish groups can swim away due to the possibility of frightening in the descending process of an upper cover, the density of the fished fish groups is low, the space of a fish collecting box is large, the density of the fish groups when the fish is caught is low, and the operation of a fish suction pump or a fishing net is inconvenient;
in addition, the device needs to move in the vertical direction when in use, so that enough space is needed, the device is generally only suitable for a huge net cage with a very high height, the applicability is poor for the huge net cage with a small height, and once a fish school enters a space formed by the upper cover and the bottom pocket, although the sizes of the net meshes on the wing net and the classification area are set to be standard, so that the caught target fish cannot escape, namely, the fish with a small size can drill out of the net, but the running speed of the fish collecting box with the bottom pocket rolled up by the winch is fast, the duration is not long, the escape time of the small fish entering the space formed by the upper cover and the bottom pocket is also short, the small fish cannot easily drill out of the net under the obstruction of the large fish, the possibility of non-uniform size in the finally caught fish school is high, the fishing efficiency is reduced, and the energy consumption is increased.
Therefore, the deep open sea large-scale net cage culture is the development direction of marine fish culture, can expand new culture space, and utilizes deep open sea high-quality water sources to culture high-quality aquatic products. The large-scale aquaculture net cage has large scale of one-time aquaculture and high yield, and the cultured adult fishes have large sizes and need to be caught in batches for marketing. The large net cage is large in structure and troublesome to operate, so that a catching device convenient to catch and enlarge needs to be designed, and a correct catching method is adopted in cooperation, so that the large net cage meets the development requirements of large and ultra-large net cage intensive cultivation. Therefore, the invention provides a batch grading catching device for large-scale net cage cultured fishes and a using method thereof.
Disclosure of Invention
Aiming at the defect that the density of fish groups caught by a fish suction pump or a dip net in a net cage is low in the prior art, the invention aims to provide a batch grading catching device for large-scale net cage cultured fishes and a using method thereof, and the specific scheme is as follows:
the utility model provides a device is caught in grades in batches to large-scale net cage cultured fish, includes large-scale aquaculture net cage, still includes:
the small lifting type fish lifting net cage is characterized in that a fish catching opening is formed in the top of the small lifting type fish lifting net cage, an inflatable gravity floating structure is arranged at the bottom of the small lifting type fish lifting net cage, and a net of the small lifting type fish lifting net cage is driven to float upwards or sink downwards by the inflatable gravity floating structure;
the fish passing channel is horizontally arranged between the large-scale aquaculture net cage and the small-scale lifting type fish lifting net cage and comprises a left channel and a right channel which are detachably and fixedly connected;
the left side channel is connected with the small lifting type fish lifting net cage in a sewing way, and a closing device is arranged at a position close to the small lifting type fish lifting net cage;
the right side channel is connected with the large-scale aquaculture net cage in a sewing way, and a closing device is also arranged at the position close to the large-scale aquaculture net cage;
the fish grading grid is vertically arranged in the left channel and is detachably and fixedly connected with the left channel.
Through the technical scheme, when a fish swarm needs to be caught, the inflatable gravity sinking and floating structure does not need to be inflated, and the netting of the small lifting type fish catching net cage floats downwards under the action of gravity until vertical forming is realized, so that the small lifting type fish catching net cage, the fish passing channel and the large aquaculture net cage are communicated. Bait is put into in the small-size over-and-under type fish box that rises, the shoal of fish gets into in the small-size over-and-under type fish box that rises from large-scale aquaculture net case through fish passageway, after reaching required numerical value when the quantity, through control binding off device, will cross the intercommunication mouth between fish passageway and two net cages and close fast, forbid fish to shift again, because left side passageway, the fixed connection can be dismantled to the right side passageway two, later with left side passageway, the two separation of right side passageway, and install the hierarchical grid of fish on the left side passageway, again with left side passageway, right side passageway reconnection, and reply to small-size over type fish box that rises, cross the fish passageway, large-scale aquaculture net box three link up.
Bait is put into the large-scale aquaculture net cage, and under the action of the fish grading grid, the small-scale fish can return to the large-scale aquaculture net cage again to continue aquaculture, and the large-scale fish is left in the small-scale lifting type fish cage. The inflatable gravity floating structure is inflated until the inflatable gravity floating structure floats to drive the netting to lift to the water surface, at the moment, the volume of the water body in the small lifting type fish lifting net cage is greatly reduced, the fish-water ratio in the net cage is greatly improved, and the net cage is convenient for fishing with a net or sucking with a fish pump.
Further, the small lifting type fish lifting net cage comprises a frame structure and a conical net structure from top to bottom, and the frame structure floats on the water surface;
the inflatable gravity sinking and floating structure is a gravity hollow steel pipe, the bottom of the inflatable gravity sinking and floating structure is provided with a water outlet, the upper part of the inflatable gravity sinking and floating structure is provided with an air inlet, and the air inlet is connected to the water surface through a hose;
the hose is connected with a stop valve, and the stop valve is matched with the hose to convey compressed gas to the gravity hollow steel pipe;
when the stop valve is opened, compressed gas enters the gravity hollow steel pipe through the hose, seawater in the gravity hollow steel pipe is discharged, when buoyancy reaches or exceeds the net weight of the gravity hollow steel pipe and the conical netting structure, the stop valve is closed, and the gravity hollow steel pipe floats on the water surface.
Through above-mentioned technical scheme, only need control the operating condition of stop valve, under the mating reaction of stop valve, hose and the hollow steel pipe of gravity, alright realize the lift of toper netting structure.
Furthermore, the stop valve and the hose are arranged on the water surface through the floater and the traction rope.
Further, the left side channel is connected with the middle position of the small lifting type fish lifting net cage;
the left side channel and the right side channel are connected through a slipknot suture rope.
Through the technical scheme, the quick separation of the left channel and the right channel can be realized through the arrangement of the movable buckle sewing rope.
Furthermore, the distance from the left channel and the right channel to the movable buckle sewing rope is not less than the height of the movable buckle sewing rope from the water surface by taking the position of the closing device as a starting point.
Through the technical scheme, the fishway can be pulled to the water surface after the fishway net is closed, and the operation is convenient.
Further, the closing device comprises a plurality of rope rings arranged outside along the circumferential direction of the fish passing channel in an array mode, and a guide line rope penetrating through the rope rings, wherein the guide line rope and the rope rings are connected through a thin rope, and the distance between every two adjacent rope rings is the distance between every two adjacent rope rings.
Furthermore, the number of the rope rings is the same as that of the net lacing lines on the fish passing channel, and the number of the rope rings is not less than four.
Furthermore, the shape and the size of the outer ring of the fish grading grid are consistent with those of the netting box body of the fish passing channel.
A use method for the large-scale net cage cultured fish batch grading catching device is characterized in that a small lifting type fish raising net cage is arranged at a preset position and then connected with a fish passing channel, a fish grading grid is not arranged in advance, and the small lifting type fish raising net cage, the large-scale culture net cage and the fish passing channel are communicated with one another to ensure that the fish passing channel is opened;
by utilizing a bait method, after a large-scale culture net cage is fasted for a period of time, feeding is carried out at the small-scale lifting type fish-lifting net cage, cultured fishes are induced to turn to the small-scale lifting type fish-lifting net cage from the large-scale net cage through a fish passage, after the transferred quantity reaches the quantity to be caught, a left closing device and a right closing device are controlled to close up quickly, then, a left passage and a right passage are separated, the closed-up left passage is pulled to the water surface, a fish grading grid is connected into the left passage according to a preset position, the left passage and the right passage are reconnected, the original position is recovered, the fish passage is ensured to be smooth, the small-scale lifting type fish-lifting net cage is fasted, and the large-scale culture net cage is fed, so that small-size fishes in the small-scale lifting type fish-lifting net cage are induced to be transferred to the large-scale culture net cage through the grid;
after the small-sized fish are transferred to the large-sized aquaculture net cage, the left closing device and the right closing device are controlled to close up quickly again from the water surface, the left channel and the right channel are closed up again, then the left channel and the right channel are separated again, the small-sized lifting type fish lifting net cage and the large-sized aquaculture net cage are separated, the bottom netting of the small-sized lifting type fish lifting net cage is lifted to the water surface by controlling the inflatable gravity sinking and floating structure, the water volume of the small-sized lifting type fish lifting net cage is reduced, and finally the small-sized fish are caught by a landing net or a fish sucking pump.
Further, the specific operation of controlling the closing device to close the opening rapidly is as follows: lifting the guide rope from the water surface, breaking the thin rope connecting the guide rope and the rope ring after the guide rope is stressed, gathering all the rope rings and further closing up the left channel and the right channel;
the specific steps of separating the left channel and the right channel are as follows: unfastening the loose-thread sewing rope from the water surface;
the concrete operation of controlling the inflatable gravity floating structure is as follows: and opening the stop valve to control the compressed air to enter the gravity hollow steel pipe, and gradually discharging the water in the gravity hollow steel pipe.
Compared with the prior art, the invention has the following beneficial effects:
(1) The whole fishing device is distributed in the horizontal direction, the small lifting type fish lifting net cages and the small fish passing channels are arranged outside the large aquaculture net cages, the small lifting type fish lifting net cages and the small fish passing channels which actually play a role in fishing are used for a fish suction pump or a landing net to fish, the fish passing channels provide a reciprocating space for fishes between the two net cages, various operations in the actual whole fishing process cannot damage the fishes inside the large aquaculture net cages, the small lifting type fish lifting net cages and the small fish passing channels can be left on one side of the large aquaculture net cages normally, the aquaculture work inside the large aquaculture net cages cannot be influenced, and the specifications of the small fish lifting net cages and the fish passing channels and the space required by the operations cannot be limited by the large aquaculture net cages and cannot occupy the space of the large aquaculture net cages.
(2) The small lifting type fish lifting net cage is arranged, so that after fishes enter the small lifting type fish lifting net cage, the communication between the fish passing channel and the small lifting type fish lifting net cage is quickly cut off through the closing-up device, the fishes cannot escape when being surprised, and the large fish density in the small lifting type fish lifting net cage is ensured; although the small lifting type fish lifting net cage also performs lifting motion, the stroke is short, and the net is lifted by arranging the inflatable gravity sinking and floating structure, so that the density of fishes in the net cage is further improved, and the fishing with a net or the fishing with a fish sucking pump is facilitated.
(3) Therefore, compared with the mechanized batch fishing device adopted in the prior art, the small lifting type fish catching net cage only needs to be slightly improved in the aspect of mechanical structure on the basis of the existing large-scale aquaculture net cage, the inflatable gravity sinking and floating structure is arranged at the bottom of the small lifting type fish catching net cage, the fish passing channel with a pure mechanical structure is arranged between the two net cages, and the closing device with the pure mechanical structure and the fish grading grating are matched, so that the graded fish catching is efficiently and conveniently completed.
(4) The sewing operation, the unfastening operation of the slipknot sewing rope and the closing operation can be finished manually or operated by mechanical external force. Because the operation is simple, even if the manual operation is adopted, the time and the energy consumed by adopting the mechanical external force operation are smaller than those in the prior art.
Drawings
FIG. 1 is a top view of the trap of the present invention;
FIG. 2 is a front view of the fishing apparatus of the present invention;
FIG. 3 is a schematic view of the inflatable gravity floating structure;
FIG. 4 is a schematic view of the small-sized lifting type fish raising net cage with the net floating to the water surface;
FIG. 5 is a schematic view showing a slipknot suture between a left side channel and a right side channel;
FIG. 6 is a schematic view showing a necking device;
fig. 7 is a schematic view of a fish grading grid.
Reference numerals are as follows: 1. large-scale aquaculture net cages; 2. a small lifting type fish lifting net cage; 21. a frame structure; 22. a conical netting structure; 23. an inflatable gravity sinking and floating structure; 3. passing through a fish channel; 31. a left side channel; 32. a right side channel; 33. the movable buckle is used for sewing the rope; 331. a movable rope end; 34. the lacing line; 4. a water outlet; 5. an air inlet; 6. a hose; 7. a stop valve; 8. a closing device; 81. a rope loop; 82. guiding a net rope; 821. an annular mouth; 9. fish grading grids; 10. a float; 11. and (4) pulling the rope.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
As shown in figure 1, the invention provides a batch grading catching device for large-scale net cage cultured fishes, which comprises a large-scale net cage 1 for culturing fishes, a small-sized lifting type fish-lifting net cage 2 which can be conveniently operated, a fish passing channel 3 which can be quickly sewed and is connected with the two net cages, and a fish grading grid 9 arranged in the fish passing channel 3.
Referring to fig. 2 to 4, the small-sized lifting type fish-lifting net cage 2 is a frame-type gravity net cage, the top of the small-sized lifting type fish-lifting net cage is a frame structure 21 capable of floating on the water surface and forming a fish catching opening for operating a fish catching group, the middle box body is a conical net structure 22, the bottom of the small-sized lifting type fish-lifting net cage is an inflatable gravity sinking and floating structure 23, the inflatable gravity sinking and floating structure 23 is a gravity hollow steel pipe, and the internal space of the small-sized lifting type fish-lifting net cage can carry water. When the small lifting type fish lifting net cage 2 is arranged in water, the frame structure 21 floats on the water surface, and the conical netting structure 22 is vertically formed under the action of the gravity hollow steel pipe. After the small-sized lifting type fish lifting net cage 2 is inflated to a certain amount, the net can be driven to float upwards.
The bottom of the gravity hollow steel pipe is provided with a water outlet 4, the upper part of the gravity hollow steel pipe is provided with an air inlet 5, the air inlet 5 is connected onto the water surface through a hose 6, the hose 6 is connected with a stop valve 7, and the two are matched with each other to convey compressed gas to the gravity hollow steel pipe. Stop valve 7, hose 6 are stabilized on the surface of water through setting up float 10 and haulage rope 11, make things convenient for staff's monitoring and operation. Because the weight of the gravity hollow steel pipe and the weight of the loaded water can make the gravity hollow steel pipe sink in water, when the air inlet 5 continuously conveys the compressed air into the gravity hollow steel pipe, meanwhile, the water in the gravity hollow steel pipe can be discharged from the water outlet 4, thereby reducing the total weight of the gravity hollow steel pipe.
The toper etting structure 22 goes up and down to realize exactly through above-mentioned operating system, open control compressed air through stop valve 7 and get into the hollow steel pipe of gravity, discharge the log raft of the hollow steel pipe of gravity, when buoyancy reaches and surpasss the hollow steel pipe of gravity and toper etting structure 22 aquatic net weight, the hollow steel pipe of gravity will float to the surface of water, and float on the same toper etting structure 22, in order to reduce the dictyosome volume of small-size over-and-under type fish lifting box 2, when the hollow steel pipe of gravity floats to the surface of water completely, close stop valve 7. At the moment, fish schools in the small lifting type fish lifting net cage 2 can be concentrated, the fish density in the space is increased, and fishing is facilitated.
Secondly, the fish passing channel 3 is in a long tubular shape and is horizontally arranged between the large aquaculture net cage 1 and the small lifting type fish raising net cage 2, the height position is in the middle position of the small lifting type fish raising net cage 2, the channel direction of the fish passing channel 3 is consistent with the tide direction, the tide direction is the direction indicated by a double arrow in the figure, the tide is used as a periodic horizontal movement phenomenon of a water body when seawater horizontally rises and falls, and under the inertia effect of seawater movement, the netting of the fish passing channel 3 can be ensured to be opened.
With reference to fig. 2 and 5, the fish passing passage 3 is sewn by using netting and is divided into a left passage 31 and a right passage 32, and the middle of the fish passing passage is detachably and fixedly connected by using a slipknot sewing rope 33, as shown in the figure, based on the slipknot principle, similar to a slipknot thread on an existing packaging bag, the slipknot sewing rope 33 is a rope body which sequentially passes through the netting on the left passage 31 and the right passage 32 through a specific threading path to realize knotting and then leaves a slipknot end 331, and the whole slipknot sewing rope 33 is pulled out from the left passage 31 and the right passage 32 by pulling the slipknot end 331, so that the left passage 31 and the right passage 32 are separated.
The left channel 31 is connected with the middle position of the small lifting type fish lifting net cage 2 by sewing, and the two are not required to be separated when not necessary. A closing-in device 8 is arranged at the position, close to the connection part with the small lifting type fish lifting net cage 2, of the left channel 31. The right channel 32 is connected with the large-scale aquaculture net cage 1 by sewing, the position is not limited, and the closing-in device 8 is also arranged at the joint of the right channel 32 close to the large-scale aquaculture net cage 1 according to the actual situation. Through setting up binding off device 8, when needs forbid fish from large-scale aquaculture net case 1 wandering out, perhaps forbid fish to wander into in the small-size over-and-under type fish box 2, only need control binding off device 8 can, will cross the connector closure between fish passageway 3 and two box with a net.
With reference to fig. 2 and 6, the closing device 8 specifically comprises a plurality of rope loops 81 arranged outside along the circumferential direction of the fish channel 3 in an array manner and a plurality of rope-guiding ropes 82 penetrating through the rope loops 81, the rope loops 81 are circular and have the same number as the net lacing lines 34 passing through the fish channel 3, the lacing lines 34 refer to steel ropes which bear the force and avoid the net from breaking and expanding in the middle of the net or at the seams thereof, and the number of the rope loops 81 is not less than 4. The guide rope 82 is a "guide rope" commonly used in the art, and refers to a steel rope usually installed between the sleeve end of the netting gear and the net bag for pulling the netting gear when the net is pulled. Because the inner diameter of the rope ring 81 is much larger than the diameter of the raising rope 82, in order to improve the structural stability between the rope ring 81 and the raising rope 82, the raising rope 82 is tied with a string between the rope ring 81 and the rope ring 81, the distance is the distance between two adjacent rope rings 81, the distance is the netting between the raising rope 82 and the rope ring 81 fixed by the string, namely the netting of the two adjacent rope rings 81 is circumferentially arc-long, and further the rope ring 81 is stably connected with the raising rope 82. As can be seen from fig. 6, an annular opening 821 is formed at one end of the raising rope 82, the number of the annular openings 821 is not limited, when the number of the annular openings 821 exceeds one, the annular openings 821 are bound in sequence, and the other end of the raising rope 82 passes through the rope ring 81 in sequence and then penetrates out of the annular opening 821 at the most edge.
In order to control the raising rope 82 conveniently, the length of the raising rope 82 is not limited, after the free end of the raising rope 82 penetrates out of the water surface, the length of the raising rope 82 needs to be extended to a position which can be obtained by a worker, after the worker pulls the raising rope 82, the raising rope 82 gradually exposes out of the water surface, and the rope rings 81 are gradually folded, so that the fish passing channel 3 is tightened.
In addition, the lengths of the left channel 31 and the right channel 32 are not less than the height of the left channel from the water surface, and further, the distance from the left channel 31 and the right channel 32 to the movable buckle sewing rope 33 is not less than the height of the left channel from the water surface by taking the position of the closing device 8 as a starting point, so that the fish passing channel 3 can be pulled to the water surface after the net is closed, and the operation is convenient.
As shown in fig. 2 and 7, and secondly, the fish grading grill 9 is vertically disposed in the left side passage 31, detachably and fixedly connected to the left side passage 31, and is located near the living-buckle seam rope 33. The shape and the size of the outer ring of the fish grading grid 9 are consistent with those of the net cage body of the fish passage 3, and the fish grading grid is connected with the net of the fish passage 3 in a sewing way. Because the suture is removable, hierarchical grid 9 of fish is quick-operation connection with cross 3 nettings of fish passageway, and for replaceable device, hierarchical grid 9 device of fish is fish size grading plant, and inside includes many parallel arrangement and is equipped with the body of rod of certain interval, changes the hierarchical grid 9 of fish of different intervals and decides to catch the fish of equidimension not, and the restriction is not done to this embodiment.
When the fishes cultured in the large-scale culture net cage 1 reach the marketable specification, the fishes need to be sold in batches according to market demands, and therefore the fishes need to be caught in batches in a grading manner, so that the fishes can be caught in a large-scale manner and in a small-scale manner according to the demands. The large net cage fish farming batch grading catching device needs to be used, and the specific use method is as follows:
after the small lifting type fish raising net cage 2 is arranged at a preset position, the fish passing channel 3 is connected, the fish grading grating 9 is not arranged in advance, and the small lifting type fish raising net cage 2, the large aquaculture net cage 1 and the fish passing channel 3 are communicated with each other to ensure that the fish passing channel 3 is opened;
by using a bait method, after the large aquaculture net cage 1 is fasted for a period of time, bait is thrown at the small lifting type fish lifting net cage 2, the cultured fishes are induced to turn from the large net cage to the small lifting type fish lifting net cage 2 through the fish passage 3, when the transfer quantity reaches the quantity required to be fished, the fish lifting net cages are simultaneously pulled over the water surface through the rope guide 82 on the fish passage 3, after the rope guide 82 is stressed, the thin ropes connecting the rope guide 82 and the rope rings 81 are broken, all the rope rings 81 are gathered, and then the left side passage 31 and the right side passage 32 are closed. Then, the slipknot suture 33 between the left and right channels 31 and 32 is untied from the water surface, the two channels are separated, the closed left channel 31 is pulled to the water surface, then the fish grading grid 9 is connected in the left channel 31 according to the preset position, the left and right channels 31 and 32 are reconnected, the original position is restored, and the fish channel 3 is ensured to be unblocked.
Then, the small lifting type fish raising net cage 2 is fasted, and the large aquaculture net cage 1 is fed to lure the small-sized fish in the small lifting type fish raising net cage 2 to be transferred to the large aquaculture net cage 1 through the grating.
After the small-sized fish are transferred to the large-scale aquaculture net cage 1, the closing-in device 8 is controlled again from the water surface to close up quickly, the left side channel 31 and the right side channel 32 are closed up again, then the left side channel 31 and the right side channel 32 are separated again, the small-scale lifting type fish lifting net cage 2 and the large-scale aquaculture net cage 1 are separated, the inflatable gravity sinking and floating structure 23 is controlled, the stop valve 7 is opened to control compressed air to enter the gravity hollow steel pipe, water in the gravity hollow steel pipe is gradually discharged, the bottom netting of the small-scale lifting type fish lifting net cage 2 is lifted to the water surface, the water volume of the small-scale lifting type fish lifting net cage 2 is reduced, and finally fishing with a landing net or fishing with a fish sucking pump is performed.
On the basis of the prior art, the arrangement of different types of grading catching devices in the large-scale aquaculture net cage 1 is most conceivable, even if the grading catching devices which are more automated in operation and perfect in structure are arranged, the internal of the large-scale aquaculture net cage 1 still can be influenced, and even if the grading catching devices are arranged outside the large-scale aquaculture net cage 1, the grading catching devices which rely on mechanical automation are only arranged.
According to the bait method, a small net cage which is used for separately attracting fishes with qualified specifications is additionally arranged outside the large-scale net cage 1, the core improvement of the invention is that the small net cage can change the shape of the small net cage and support fish groups to the water surface, so that the small net cage is convenient to catch, and the small net cage is also one of the core improvements of the invention, and on the basis of the large-scale net cage 1, the batch grading catching device for the fishes cultured in the large net cage is formed by combining the improvements in the above.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered as within the scope of the present invention.
Claims (10)
1. The utility model provides a device is caught in grades in batches to large-scale box culture fish, includes large-scale culture box with a net (1), its characterized in that still includes:
the small lifting type fish lifting net cage (2) is provided with a fish catching opening at the top and an inflatable gravity floating structure (23) at the bottom, and the inflatable gravity floating structure (23) drives a net of the small lifting type fish lifting net cage (2) to float upwards or sink downwards;
the fish passing channel (3) is horizontally arranged between the large-scale aquaculture net cage (1) and the small lifting type fish lifting net cage (2) and comprises a left channel (31) and a right channel (32) which are detachably and fixedly connected;
the left side channel (31) is connected with the small lifting type fish lifting net cage (2) in a sewing way, and a closing device (8) is arranged at a position close to the small lifting type fish lifting net cage (2);
the right side channel (32) is connected with the large-scale aquaculture net cage (1) in a sewing way, and a closing device (8) is also arranged at the position close to the large-scale aquaculture net cage (1);
the fish grading grid (9) is vertically arranged in the left channel (31) and is detachably and fixedly connected with the left channel (31).
2. The batch grading fishing device for large-sized net cage cultured fishes according to claim 1, wherein the small-sized lifting type fish lifting net cage (2) comprises a frame structure (21) and a conical net structure (22) from top to bottom, and the frame structure (21) floats on the water surface;
the inflatable gravity sinking and floating structure (23) is a gravity hollow steel pipe, the bottom of the inflatable gravity sinking and floating structure is provided with a water outlet (4), the upper part of the inflatable gravity sinking and floating structure is provided with an air inlet (5), and the air inlet (5) is connected to the water surface through a hose (6);
the hose (6) is connected with a stop valve (7) which is matched with the stop valve to convey compressed gas to the gravity hollow steel pipe;
when the stop valve (7) is opened, compressed gas enters the gravity hollow steel pipe through the hose (6), seawater in the gravity hollow steel pipe is discharged, when buoyancy reaches and exceeds the net weight of the gravity hollow steel pipe and the conical netting structure (22), the stop valve (7) is closed, and the gravity hollow steel pipe floats on the water surface.
3. A batch-grading fishing device for large-sized net cage cultured fishes according to claim 2, characterized in that the stop valve (7) and the hose (6) are arranged on the water surface through a floater (10) and a hauling rope (11).
4. The batch grading fishing device for large-sized net cage cultured fishes according to claim 2, characterized in that the left side passage (31) is connected with the middle position of the small-sized lifting type fish cage (2);
the left channel (31) and the right channel (32) are connected through a movable buckle sewing rope (33).
5. The batch grading and catching device for large-scale net cage cultured fishes as claimed in claim 2, characterized in that the distance from the left channel (31) and the right channel (32) to the living-buckle suture rope (33) is not less than the height from the water surface from the position of the closing device (8) as a starting point.
6. A large net cage farmed fish batch grading and catching device as in claim 1, characterized in that the closing device (8) comprises a plurality of rope loops (81) arranged outside along the fish passage (3) in circumferential array, a raising line rope (82) passing through the rope loops (81), the raising line rope (82) and the rope loops (81) are connected by a thin rope, and the distance is the distance between two adjacent rope loops (81).
7. A large net cage farmed fish batch grading and catching apparatus as claimed in claim 6, characterized in that the number of rope loops (81) is the same as the number of net lacing lines (34) on the fish passage (3) and is not less than four.
8. A large net cage for batch grading and catching of farmed fish according to claim 1, characterized in that the outer ring of the fish grading grid (9) is shaped and sized to conform to the net cage of the fish passage (3).
9. A method for using the large-scale net cage cultured fish batch grading and catching device according to any one of claims 1-8, the small lifting type fish raising net cage (2) is installed at a preset position, then the small lifting type fish raising net cage is connected with the fish passing channel (3), the fish grading grating (9) is not installed in advance, and the small lifting type fish raising net cage (2), the large-scale culture net cage (1) and the fish passing channel (3) are communicated with each other to ensure that the fish passing channel (3) is opened;
by utilizing a bait method, after a large-scale aquaculture net cage (1) is fasted for a period of time, bait is thrown at a small-scale lifting type fish-lifting net cage (2), cultured fishes are induced to turn to the small-scale lifting type fish-lifting net cage (2) from the large-scale net cage through a fish passage (3), after the transfer quantity reaches the quantity needing to be fished, a left closing device (8) and a right closing device (8) are controlled to close up quickly, then a left passage (31) and a right passage (32) are separated, the closed left passage (31) is pulled to the water surface, a fish grading grid (9) is connected into the left passage (31) according to a preset position, the left passage (31) and the right passage (32) are reconnected, the original position is recovered, the fish passage (3) is ensured to be unblocked, the small-scale lifting type fish-lifting net cage (2) is fasted, and the large-scale aquaculture net cage (1) is thrown to induce the small-scale lifting type fish-lifting net cage (2) to transfer small-scale fish-lifting net cage (1) through the grid;
after the small-sized fish are transferred to the large-sized aquaculture net cage (1), the left closing device (8) and the right closing device (8) are controlled to close up quickly from the water surface again, the left channel (31) and the right channel (32) are closed up again, then the left channel (31) and the right channel (32) are separated again, the small-sized lifting type fish lifting net cage (2) and the large-sized aquaculture net cage (1) are separated, the bottom netting of the small-sized lifting type fish lifting net cage (2) is lifted to the water surface by controlling the inflatable gravity sinking and floating structure (23), the water volume of the small-sized lifting type fish lifting net cage (2) is reduced, and finally the small-sized fish are caught by a landing net or a fish sucking pump.
10. The use method of the batch grading catching device for the large-scale net cage cultivated fishes as claimed in claim 9, wherein the specific operation of controlling the quick closing of the left closing device and the right closing device (8) is as follows: lifting the guide rope (82) from the water surface, breaking the thin rope connecting the guide rope (82) and the rope ring (81) after the guide rope (82) is stressed, gathering all the rope rings (81) and closing the left channel (31) and the right channel (32);
the specific steps of separating the left channel (31) and the right channel (32) are as follows: unwinding the living-buckle suture rope (33) from the water surface;
the concrete operation of controlling the inflatable gravity floating structure (23) is as follows: and opening the stop valve (7) to control compressed air to enter the gravity hollow steel pipe, and gradually discharging water in the gravity hollow steel pipe.
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