CN108849777B - Macrobrachium nipponensis expanding net capable of releasing jellyfish and assembling method thereof - Google Patents
Macrobrachium nipponensis expanding net capable of releasing jellyfish and assembling method thereof Download PDFInfo
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- 241000242583 Scyphozoa Species 0.000 title claims abstract description 138
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- 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
- A01K71/00—Floating nets
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- 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
- A01K75/00—Accessories for fishing nets; Details of fishing nets, e.g. structure
- A01K75/04—Floats
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- 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
- A01K75/00—Accessories for fishing nets; Details of fishing nets, e.g. structure
- A01K75/06—Sinkers
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Abstract
The invention relates to a crayfish expanded mesh capable of releasing jellyfish and an assembly method thereof, belongs to the technical field of marine fishing, and is characterized in that a jellyfish blocking and separating mesh sheet is obliquely arranged in a single conical bag-shaped main mesh on the basis of not influencing the performance of fishing the crayfish to form a mesh-in-mesh structure, and a jellyfish releasing opening is reserved at the position close to the rear of the middle of an upper side edge seam of a single conical bag-shaped main mesh. And selecting a proper floating-sinking ratio, additionally installing a large floating ball, and carrying out aiming fishing by adjusting the length of the large floating ball line. The invention has simple structure, easy manufacture, convenient operation and low cost; not only can effectively release the jellyfish, but also does not influence the fishing performance of the crayfish expanded net.
Description
The technical field is as follows:
the invention belongs to the technical field of marine fishing, and particularly relates to a macrobrachium nipponensis net capable of releasing jellyfish and an assembly method thereof.
Technical background:
acetes chinensis Hansen belongs to the order of the ten-legged order, the family of Acridaeidae, the genus Acronychia, commonly known as Acronychia chinensis. The body length is 26-40 mm, the 1-year floating small shrimps are flat on the body side, the carapace is very thin, and the body color is transparent. The swimming skill is weak, the swimming skill is mainly oriented to swim along with the tide during moving, the long-distance migration habit is avoided, and the directional movement is only carried out along with the seasons. China is distributed on coastal areas, the number of Bohai sea is the largest, the products are important catching objects for net-spreading operation on the coastal areas, and most of the products are made into dry products except a few fresh products, which are commonly called as dried shrimps; the Acetes chinensis can also be made into shrimp paste. According to the data of 'statistical annual book of Chinese fishery (2015)' published in 2016, the total yield of catching the macrobrachium nipponensis from Tianjin, Hebei, Liaoning and Shandong is 13.0985 ten thousand tons in 2015.
A crayfish net is one of the main fishing tools commonly used by fishermen along the shore of Bohai sea. The macrobrachium nipponensis net fishing tool comprises a single conical bag-shaped main net, a steel cable, accessories and the like, and generally 5-6 single conical bag-shaped main nets are arranged in parallel as a group. The single cone-shaped bag-shaped main netting consists of a flange net, a body net and a bag net. The edge net is generally 4-5 meshes and is formed by knitting polyethylene net wires and is positioned at a net opening, the net wires are thick, the meshes are large, the effect of protecting the net opening is achieved, and the stress of the whole net opening is borne; the body net is positioned behind the edge net, generally has a length of about 0.7m, is formed by knitting polyethylene net wires, has thicker net wires and larger meshes, plays a transition role, and is connected with the sac net; the sac net is formed by sewing net cloth woven by PE monofilament warps and wefts, has a 3-8 mm square mesh and is a main part for catching the prawns. The steel cable mainly comprises a floaters line, an upper border line, a sinkers line, a lower border line, a sidelong line, a cross line and an anchor line. The net has a floater on the head line and a sinking weight on the foot line, the two sides of the net mouth are supported by log brace rods, and the buoyancy, the sinking force and the brace rods keep the net mouth vertically open; the two sides of the net are connected with the cross ropes which are connected with the iron anchor handle rings, and the iron anchors on the two sides are used as fulcrums to enable the net to be horizontally opened. The macrobrachium nipponensis is arranged in a row and in a transverse flow mode, and works in an area with slow water flow, and the working water depth is 10-30 m. The other type of the crayfish net is of a frame type, namely a net opening is opened by 4 wood rods; in addition, there are many kinds of freshwater shrimp nets. The fishing principle of the freshwater shrimp net is that according to the life habits of the freshwater shrimps, the water is fixedly laid in a water area of a fishing farm by means of iron anchors (anchors, piles, pegs and the like), the net is opened by means of the impact of water flow, and the passing seawater is filtered to catch the freshwater shrimps.
The Bohai shrimp operation fishing ground mainly comprises a Bohai sea western part of a Liaodong bay, a yellow river sea entrance and a Laizhou bay sea area; the fishing season of the operation is two seasons of spring and autumn, the spring festival is 3 to 6 months of the first ten days, and the autumn season is 8 to 10 months of the first ten days. When the freshwater shrimps are caught in autumn, a part of the jellyfish enters the freshwater shrimp net along with water flow due to the overlapping of the jellyfish vigorous growth period, if a certain amount of the jellyfish enters the freshwater shrimp net, the water flow can cause the water flow to burst the water flow, the caught objects of the freshwater shrimps are completely lost, and if the caught objects are heavy, the fishing gear is scrapped. The problem that the fishes enter the shrimp net when catching the shrimps is a headache problem for fishermen, and therefore the shrimp net needs to be modified and redesigned, so that the shrimp net can release the fishes smoothly without affecting the catching effect of the shrimps.
The invention content is as follows:
the invention aims to solve the technical problem of providing a crayfish expanding net capable of releasing jellyfish and an assembly method thereof. And selecting a proper floating-sinking ratio, additionally installing a large floating ball, and carrying out aiming fishing by adjusting the length of the large floating ball line. The invention has simple structure, easy manufacture, convenient operation and low cost; not only can effectively release the jellyfish, but also does not influence the fishing performance of the crayfish expanded net.
The invention is realized by adopting the following technical scheme:
a monomer cone-shaped bag-shaped main net capable of releasing jellyfish comprises a monomer cone-shaped bag-shaped main net body, an upper bole, a lower bole, a lateral bole, a floaters, a sinZi, a floater, a sinker and a jellyfish blocking and separating net sheet; the monomer cone-shaped bag-shaped main netting consists of a flange net, a body net and a bag net; the upper border line, the lower border line and the side lines respectively penetrate through edge meshes on the upper side and the lower side of a net opening of the monomer cone-shaped bag-shaped main netting, the floater penetrates through the floater line and the upper border line and is bound to the upper border line to be called the upper border line, the sinker penetrates through the sinker line and the lower border line to be bound to be called the lower border line, the jellyfish stopping and separating net piece is in an irregular quadrangle and is provided with two right-angle sides and two inclined sides; one right-angle side of the jellyfish blocking and separating net sheet is horizontally assembled on the foot line, the other right-angle side of the jellyfish blocking and separating net sheet is vertically assembled on the side line, one bevel edge of the jellyfish blocking and separating net sheet is gradually assembled on the upper net sheet in the single conical bag-shaped main net garment in an inclined mode backwards and upwards, the other bevel edge of the jellyfish blocking and separating net sheet is assembled on the side net sheet in the single conical bag-shaped main net garment in an inclined mode backwards and upwards from a net opening, a section is reserved in the middle of the edge seam of one side of the upper side of the single conical bag-shaped main net garment close to the rear portion and is used as a jellyfish release opening, and the included angle of the two bevel edges of the jellyfish blocking and separating net sheet, which are extended.
Further, the length of a right-angle edge connecting the jellyfish blocking separation net sheet and the foot line is 10m and 129 meshes, the length is the length of the netting after the netting is contracted, and the contraction coefficient of the netting is 0.707.
Further, the length of a right-angle edge, connected with the siding line, of the jellyfish blocking and separating net sheet is 4m and 51.5 meshes, the length is the length of the netting after the netting is shrunk, and the shrinking coefficient of the netting is 0.707.
Further, the length of the bevel edge connecting the jellyfish blocking separation mesh and the mesh on the upper surface in the single conical bag-shaped main netting is 12.15m and 156 meshes, the length is the length of the netting after the netting is contracted, and the contraction coefficient of the netting is 0.707.
Further, the length of the other bevel edge of the jellyfish blocking separation net sheet connected with the side net sheet is 6.91m and 89 meshes, the length is the length of the netting after the netting is shrunk, and the netting shrinkage factor is 0.707.
Furthermore, the jellyfish release opening is positioned at the position, close to the back, in the middle of the side seam on one side of the upper surface of the single cone-shaped bag-shaped main net, and the opening length is 1.00 m. Under the condition that no jellyfish is inserted into the net, the single conical bag-shaped main net is impacted by water flow to generate backward pulling force, and under the action of the pulling force, the jellyfish release opening is in a closed state, and the acete chinensis can not escape basically; if the individual jellyfish enters the jellyfish-blocking separation net sheet in the conical bag-shaped main net, the individual jellyfish is blocked by the jellyfish-blocking separation net sheet, then the jellyfish is rushed to the jellyfish release opening along the blocking separation net sheet which is inclined backwards and upwards under the impact of water flow, the individual jellyfish is large, the resistance of the individual jellyfish to the water impact is also large, and the individual jellyfish is squeezed to open the jellyfish release opening along with the water impact to escape.
The invention also provides a freshwater shrimp net capable of releasing jellyfish, which comprises a freshwater shrimp net unit, a vertical rod, a forkhead line, an anchor line, an iron anchor, a large floating ball line and a large floating ball; the macrobrachium nipponensis net unit is formed by sequentially connecting 5-6 same monomer conical bag-shaped main nets in parallel through an upper line and a lower line, and vertical rods are respectively bound on two sides of the macrobrachium nipponensis net unit; the cross lines are respectively connected with the upper end and the lower end of the vertical rod, the folded part of the cross lines is connected with the anchor lines, and the other end of the anchor lines is connected with the iron anchor; the vertical rods, the floating ropes and the sinker ropes enable the net to keep vertically open, and the iron anchors at the two ends enable the net to keep horizontally open through the anchor ropes and the fork ropes; one end of the big floating ball line is connected to the folded part of the cross line, the other end of the big floating ball line is connected with a big floating ball floating on the water surface, and the length of the big floating ball line is adjusted to lay the crayfish net in the required water depth so as to be aimed and fished.
The invention also provides an assembly method of the giant freshwater shrimp expanded mesh capable of releasing jellyfish, which comprises the assembly of the single conical bag-shaped main netting, the assembly of the steel cable and the assembly of the sinker, the assembly of the jellyfish blocking separation mesh sheet and the integral assembly of the giant freshwater shrimp expanded mesh unit;
firstly assembling the whole monomer conical bag-shaped main net coat, a steel cable, a floater and a sinker, and then reserving a jellyfish release opening at the middle rear part of the side seam of one side of the monomer conical bag-shaped main net coat with the floaters, without winding and binding; the jellyfish blocking and separating net is obliquely and additionally arranged in the conical bag-shaped main net from the net opening, one right-angle edge of the jellyfish blocking and separating net is connected to the lower line of the single conical bag-shaped main net, the other right-angle edge of the jellyfish blocking and separating net is connected to one side line of the single conical bag-shaped main net, one oblique edge of the jellyfish blocking and separating net is obliquely connected to the upper net in the single conical bag-shaped main net backwards, the other oblique edge of the jellyfish blocking and separating net is obliquely and upwards connected to the side net in the single conical bag-shaped main net backwards, and the included angle of the two oblique edges of the jellyfish blocking and separating net after being oblique is exactly aligned with the tail end of the jellyfish release opening;
the integral assembly of the macrobrachium nipponensis expanded net unit is that after the monomer conical bag-shaped main netting and the related steel cables, floats, sinkers and jellyfish blocking separation net pieces are assembled to form the monomer conical bag-shaped main net, the head lines and the foot lines of every two monomer conical bag-shaped main nets are sequentially connected, 1 macrobrachium nipponensis expanded net unit is assembled by every 5-6 monomer conical bag-shaped main nets, 1 vertical rod is respectively bound on each of two sides of the macrobrachium nipponensis expanded net unit, the upper end and the lower end of each vertical rod are connected with cross lines, the folded part of each cross line is connected with an anchor line and a large floating ball line, the anchor line is connected with an iron anchor, and the large floating ball line is connected with a large floating ball.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes the principle of geometric structure, adopts a large mesh net piece to weave a jellyfish stopping and separating net piece into an irregular quadrangle, is obliquely and additionally arranged in a conical bag-shaped main net, one right-angle side is horizontally assembled on a lower net, the other right-angle side is vertically assembled on a lateral net, one inclined edge is gradually assembled on an upper net piece in the conical bag-shaped main net in a backward inclining way, the other inclined edge is assembled on one side surface in the conical bag-shaped main net in a backward inclining way from a net opening to the upper side, an inner net stopping device similar to a conical bag shape is formed in the net, and the tail end of a bag is connected to a jellyfish releasing opening at the side edge. The jellyfish blocking and separating net sheet can better block jellyfish of larger individuals, but does not influence the smooth passing of the small individual macrobrachium nipponensis and the direct passing of the small individual macrobrachium nipponensis to the bottom of the capsule.
According to the invention, by utilizing the hydrodynamic principle, after the jellyfish is blocked by the jellyfish blocking and separating net sheet, the jellyfish is washed to the bottom of the blocking net along the net wall of the blocking device under the impact of water flow; the individual jellyfish is large and the water impact resistance is large, so that the jellyfish is impacted to the release opening, and the jellyfish is squeezed open the release opening to be released under the impact of the water flow.
According to the invention, the jellyfish release opening is skillfully designed, so that the release opening is positioned at the position, close to the rear, of the middle of the side seam of one side of the upper side of the conical bag-shaped main net, when no jellyfish is inserted into the net, the whole conical bag-shaped main net generates a backward pulling force under the impact of water flow, and under the action of the pulling force, the jellyfish release opening is in a closed state, and the individual macrobrachium nipponense is small, and the resistance generated during the impact of the water flow is small and cannot escape from the position; the release opening is positioned 1.82m away from the bag bottom, so that the jellyfish blocking and separating net sheet can have a proper inclination, and the jellyfish impacted by water flow can slide to the release opening; furthermore, there is still a 1.82m long section of mesh sack behind the discharge opening, sufficient to be able to sack a large number of captured prawns.
The invention adopts the floating-sinking ratio equipment with the static buoyancy slightly smaller than the sinking force, the floating-sinking ratio is 1:1.07, and the floating-sinking ratio is favorable for suspending the shrimp net in water; and the length of the large floating bole is adjusted, so that the laying water layer of the crayfish net can be adjusted according to the water layer for the crayfish to inhabit, which is detected by the fish detector, to carry out aiming fishing.
Drawings
FIG. 1 is a net structure of a young shrimp capable of releasing jellyfish and an operation schematic diagram: 1-seine, 2-seine, 3-cycas, 4-epilobioides, 5-floaters, 6-floaters, 7-collateral lines, 8-lower-limbioides, 9-sinensions, 10-sinkers, 11-jellyfish-blocking separation meshes, 12-edgesewages, 13-synnema, 14-jellyfish-releasing openings, 15-vertical rods, 16-cross lines, 17-anchories, 18-iron anchors, 19-large floaters, 20-large floating balls;
FIG. 2 is a schematic structural diagram of a monomer cone-shaped bag-shaped main net and a jellyfish release device: 1-seine, 2-body net, 3-sac net, 4-epilobium, 5-floaters, 6-floaters, 7-collateral line, 8-lower-limbus line, 9-sinensiles line, 10-sinkers, 11-jellyfish blocking separation net sheet, 12-edgesewages line, 13-bungium, 14-jellyfish release opening;
fig. 3 is a schematic diagram of a jellyfish-blocking separator mesh: 10m (129 mesh), 4m (51.5 mesh), 12.15m (156 mesh), and 6.91m (89 mesh).
The specific implementation mode is as follows:
the technical contents of the present invention will be described in detail below with reference to the accompanying drawings by way of examples, but the technical solutions of the present invention are not limited in any way by the examples.
Example 1
A single pyramidal bag-shaped main net for releasing jellyfish comprises a single pyramidal bag-shaped main net, an upper bolch 4, a lower bolch 8, a lateral bolch 7, a floater 6, a sinker 10 and a jellyfish-blocking separation net sheet 11. The upper bolch 4, the lower bolch 8 and the lateral bolch 7 respectively penetrate through the edge meshes on the upper side and the lower side of the net opening of the monomer cone-shaped bag-shaped main netting, the floater 6 penetrates through the floater 5 and the upper bolch 4 and is bound to be called the upper bolch, the sinker 10 penetrates through the sinker 9 and the lower bolch 8 and is bound to be called the lower bolch, and the monomer cone-shaped bag-shaped main netting is used for catching the macrobrachium nipponense; the headlines, the bottom lines and the side lines 7, the floats 6 and the sinkers 10 form a main framework of the netting gear and enable the netting gear to be vertically opened. The jellyfish blocking and separating mesh sheet 11 is a large mesh sheet which can block the jellyfish of a larger individual and can allow the small macrobrachium nipponensis to pass through smoothly, is in an irregular quadrilateral shape and is provided with two right-angle sides and two bevel sides; one right-angle side of the jellyfish blocking and separating net piece 11 is horizontally assembled on the foot line, the other right-angle side of the jellyfish blocking and separating net piece 11 is vertically assembled on the side line 7, one inclined side of the jellyfish blocking and separating net piece 11 is gradually assembled on the upper net piece in the single conical bag-shaped main net garment in an inclined manner backwards and upwards, the other inclined side of the jellyfish blocking and separating net piece 11 is assembled on the side net piece in the single conical bag-shaped main net garment in an inclined manner backwards and upwards from the net opening, a section is left at the rear part of the middle of the side seam of the upper side of the single conical bag-shaped main net garment and is used as a jellyfish releasing opening 14, and the included angle of two inclined sides of the jellyfish blocking and separating net piece 11, which extend backwards, is superposed with the tail end.
The length of a right-angle edge of the jellyfish blocking separation net sheet 11 connected with the lower line is 10m and 129 meshes, the shrinkage coefficient of the netting is 0.707, and the length is the length of the netting after shrinkage.
The length of a right-angle edge of the jellyfish blocking separation net piece 11 connected with the right foot line is 4m and 51.5 meshes, the shrinkage coefficient of the netting is 0.707, and the length is the length of the netting after shrinkage.
The inclined edge length of the jellyfish blocking separation net sheet 11 connected with the net sheet on the monomer cone-shaped bag-shaped main net is 12.15m and 156 meshes, and the length is the length of the net after the net is contracted.
The length of the other bevel edge of the jellyfish stopping and separating net sheet 11 connected with the left side net sheet is 6.91m and 89 meshes, and the length is the length of the netting after the netting is shrunk.
The jellyfish release opening 14 is positioned at the position, close to the back, in the middle of the left side seam on the upper surface in the monomer cone-shaped bag-shaped main net, and the opening length is 1.00 m. In the case where there is no jellyfish inserted into the net, the single cone-shaped bag-shaped main net is impacted by the water flow to generate a backward pulling force, and under the pulling force, the jellyfish release opening 14 is closed and the acete chinensis cannot substantially escape therefrom; if the individual jellyfish enters the jellyfish-blocking separation mesh sheet 11 in the conical bag-shaped main netting, the jellyfish is firstly blocked by the jellyfish-blocking separation mesh sheet 11, then under the impact of water flow, the jellyfish is flushed to the jellyfish release opening 14 along the jellyfish-blocking separation mesh sheet 11 which is inclined backwards, the individual jellyfish is large, the water impact resistance is also large, and the individual jellyfish is flushed to open the jellyfish release opening 14 to escape.
A macrobrachium nipponensis expanding net capable of releasing jellyfish comprises a macrobrachium nipponensis expanding net unit, a vertical rod 15, a cross line 16, an anchor line 17, an iron anchor 18, a large floating ball line 19 and a large floating ball 20, wherein 6 groups of same monomer cone-shaped bag-shaped main nets are connected in parallel in sequence through adjacent head lines and foot lines to form a macrobrachium nipponensis expanding net unit, as shown in figures 1 and 2: the single cone-shaped bag-shaped main net comprises a border net 1, a body net 2, a bag net 3, an upper border line 4, a floaters line 5, floaters 6, a side border line 7, a lower border line 8, a sinker line 9, sinkers 10, a jellyfish blocking and separating net sheet 11, a border line 12, a bag bottom lacing line 13 and jellyfish release openings 14. The edge net 1, the body net 2 and the bag net 3 are sewed to form a single cone-shaped bag-shaped main netting. The upper edge mesh and the lower edge mesh of the edge net 1 are respectively penetrated into an upper edge mesh 4 and a lower edge mesh 8, the upper edge mesh 4 is bundled with a floater mesh 5 penetrated into a floater 6 to be called an upper mesh, the lower edge mesh 8 is bundled with a sinker mesh 9 wrapped with a lead sinker 10 to be called a lower mesh, and the side edge mesh of the edge net 1 is penetrated into a side mesh 7 and the upper end and the lower end of the side mesh 7 are respectively connected to the upper mesh and the lower mesh. A jellyfish blocking and separating net piece 11 is obliquely arranged in the main net from the net opening backwards to form a net-in-net structure, and a jellyfish releasing opening 14 is reserved at the upper side seam of the main net of the conical bag. Vertical rods 15 are respectively bound on two sides of the freshwater shrimp net-opening unit. The cross lines 16 are respectively connected with the upper end and the lower end of the vertical rod 15, the folded part of the cross lines 16 is connected with the anchor lines 17, and the other end of the anchor lines 17 is connected with the iron anchor 18. The vertical rod 15, the floating line 5 and the sinking line 9 keep the net vertically open, and the iron anchors 18 at the two ends keep the net horizontally open through the anchor lines 17 and the cross lines 16. One end of the big floating ball line 19 is connected with the folded part of the fork line 16, the other end is connected with a big floating ball 20 floating on the water surface, and the macrobrachium nipponensis net can be laid at the required water depth position by adjusting the length of the big floating ball line 19 (see figures 1, 2 and 3).
Edge net 1: the PE36tex20 is formed by manually weaving a net wire, and the net wire is long in belt shape, 55mm in mesh size, 848 meshes multiplied by 4 meshes, knitted by straight meshes, and straightened by 0.22 m.
A body net 2: the PE36tex15 is formed by manually weaving a net wire, and the net wire is long in belt shape, 55mm in mesh size, 848 meshes multiplied by 12.5 meshes, knitted by straight meshes, and straightened by 0.69 m.
A bag net 3: the Polyethylene (PE) knotless net sheets are square meshes, 5mm in mesh size and formed by sewing 4 isosceles trapezoid Polyethylene (PE) knotless net sheets, wherein 2 Polyethylene (PE) knotless net sheets are 3333 meshes multiplied by 90 meshes in specification and 1542 Polyethylene (PE) knotless net sheets are 1542 meshes in specification, and 2 Polyethylene (PE) knotless net sheets are 1311 meshes multiplied by 90 meshes in specification and 1542 meshes in length; cut out from commercial mesh sheets.
Upper border line 4: polyethylene (PE) rope, diameter 10.5mm, length 10.00m, 1. The upper border line 4 penetrates through the edge mesh of the upper border net 1, the assembling mesh is 303 meshes, and the net clothes shrinkage factor of the upper border net 1 is 0.60.
Bobber line 5 and bobber 6: the floating headrope 5 is a Polyethylene (PE) rope with the diameter of 10.5mm and the length of 10.00m, and 1 rope; the floats 6 are spherical foam plastic floats with pore diameters of 90mm and static buoyancy of 350gf, 10 single conical bag-shaped main nets are assembled, and the floats 6 penetrate through the floating headrope 5 at equal intervals of 1.00 m.
Lower border line 8: polyethylene (PE) rope, diameter 10.5mm, length 10.00m, 1. The lower border line 8 penetrates through the edge mesh of the lower border net 1, the assembling mesh is 303 meshes, and the net shrinkage factor of the lower border net 1 is 0.60.
Sinker line 9 and sinker 10: the floating headrope 9 is a Polyethylene (PE) rope with the diameter of 10.5mm and the length of 10.00m, and is 1; the sinker 10 is a lead sheet, each weight is 250g, 15 monomer conical bag-shaped main nets are assembled on each monomer conical bag-shaped main net and wrapped on the sinker line 9 at an interval of 0.67m and the same. The static buoyancy is slightly less than the sinking force, and the floating-sinking ratio is 1: 1.07.
The outline 7: polyethylene (PE) rope, diameter 6mm, length 4.00m, 1 each on the left and right sides. The side foot line 7 penetrates through the side edge mesh of the edge net 1, the assembling mesh is 121 meshes, and the shrinkage factor of the net is 0.60.
Jellyfish blocking and separating mesh sheet 11: the mesh is in a trapezoid shape, is provided with two right-angle sides and two oblique sides, is woven by polyethylene (PE36tex15 multiplied by 3) mesh wires and has a mesh size of 110 mm; the specification is 10.00m (the length of the netting after shrinkage) (129 meshes) multiplied by 4.00m (the length of the netting after shrinkage) (51.5 meshes) multiplied by 12.15m (the length of the netting after shrinkage) (156 meshes) multiplied by 6.91m (the length of the netting after shrinkage) (89 meshes), wherein the 10.00m side and the 4.00m side form a right angle; the net piece is obliquely and additionally arranged in the conical bag-shaped main net, the edge of 10m (129 meshes) of the net piece is connected to the lower girth 8 and the sinker girth 9 of the net opening door of the crawfish, in order to ensure that the net meshes are opened in a square shape, the shrinkage coefficient of the net piece is 0.707, the edge of 4m (51.5 meshes) is connected to the side girth 7, the shrinkage coefficient of the net piece is 0.707, the edge of 12.15m (156 meshes in an oblique direction) is obliquely connected to one net piece on the edge net 1, the body net 2 and the bag net 3 on the inner side of the conical bag-shaped main net backwards, and the edge of 6.91m (89 meshes) is obliquely connected to one net piece on the edge net 1, the body net 2 and the side of the bag net 3 on the inner side of the conical.
Edge seam line 12: the diameter of the Polyethylene (PE) rope is 4mm, the length of the PE rope is 8.73m, each side seam is 2, the number of the side seams is 8, one end of each side seam 12 is tied to be in a dead knot mode and connected to the upper line and the lower line, the shrinkage factor of the net 1, the net 2 and the side seams 12 is 0.80, the edge seams 12 are assembled along the oblique edges of the bag net 3, the shrinkage factor of the net of the bag net 3 is 1.00, and then the two side seams 12 are folded and bound together.
The capsular base line 13: polyethylene (PE) ropes with the diameter of 5mm and the length of 1.00m are used for binding the bag bottom of the bag net 3, and the bag bottom lacing line 13 is untied when the fish catch is poured out.
Jellyfish release opening 14: a jellyfish release opening 14 with the length of 1.00m is reserved at the position 1.82m away from the bag bottom of the side seam of one side of the upper surface (the surface with the floaters line) of the bag net 3, and the jellyfish release opening is not wound and pricked.
The monomer cone-shaped bag main nets 6 are 1 group and are connected together for use.
Vertical bar 15: log with diameter of about 100mm and length of 4.50m, 2 macrobrachium nipponensis net units are used for 1 macrobrachium nipponensis net unit, the macrobrachium nipponensis net units are positioned on two sides, and the tail ends of the side lines 7, the upper lines and the lower lines of a conical bag-shaped main net garment on the side are bound on a vertical rod 15; the vertical rod 15 is used for supporting the net mouth of the shrimp net to be vertically opened, and the upper end and the lower end of the vertical rod are connected with the forked line 16.
The cross line is 16: the Polyethylene (PE) rope is 18mm in diameter and 17.00m in length, is folded in half for use, 2 haired shrimp net units are used for 1 haired shrimp net unit, and 1 is connected to the vertical rods 15 on the two sides respectively.
An assembly method of a giant freshwater shrimp net capable of releasing jellyfish comprises the assembly of a single conical bag-shaped main net, the assembly of a steel cable, the assembly of a floater 6 and a sinker 10, the integral assembly of a jellyfish blocking and separating net sheet 11 and a giant freshwater shrimp net unit.
The assembly of the monomer cone-shaped bag-shaped main net comprises the assembly of a flange net 1, a body net 2 and a bag net 3: sewing two ends of the edge net 1 into a cylinder shape according to 1 mesh; then sewing the two ends of the net 2 into a cylinder shape according to 1 mesh; the edge net 1 and the body net 2 are knitted and sewed according to 1 mesh. Then the big head edges of the 4 pieces of trapezoidal sac net 3 and the body net 2 are sewn on the body net 2 by sewing according to 1 big mesh to 11 meshes of the sac net 3 (see figure 1).
The assembly of the steel cable and the assembly of the float sinker comprise the assembly of an upper border line 4, a float line 5, a lower border line 8, a sinker line 9, a side line 7 and a side seam line 12 and the assembly of a float 6 and a sinker 10: firstly, the head line 4 penetrates through the edge mesh 303 of the head net 1 at the upper side, 1 mesh is tied by using a net wire for every 5 meshes, and the shrinkage factor of the net is 0.60; then, after the floating headrope 5 penetrates into the floater 6, the floating headrope is parallel to the upper headrope 4, and the distance between the floaters 6 is 1.00 m; the floating headrope 5 and the superior headrope 4 are called the headrope. Then the lower bolch 8 is penetrated into the edge mesh 303 meshes of the lower border net 1, 1 mesh is tied by a net wire every 5 meshes, and the shrinkage factor of the net is 0.60; then wrapping lead sheet sinkers 10 on the sinkers 9, wherein the distance between the sinkers 10 is 0.67m, and then binding the lower girth 8 and the sinkers 9; the sinker line 9 and the lower margin line 8 are called the lower margin line. 2 side lines 7 are respectively penetrated into the edge meshes 121 meshes of the edge net 1 at two sides, 1 mesh is tied by using net wires for every 5 meshes, and the shrinkage factor of the net is 0.60. Respectively knotting the front ends of 8 side sewing lines 12, wherein each 2 side sewing lines are 1 group, and connecting the front ends of the 8 side sewing lines to the upper line and the lower line, respectively circularly sewing two sides of each piece of the net of the bag net 3 to the side sewing lines 12, and then circularly sewing the 2 side sewing lines 12 together; the front half parts of the 2 side seam lines 12 with the jellyfish release openings 14 are assembled with jellyfish stopping and separating net pieces 11, and then are wound and bound together. A jellyfish release opening 14 with a length of 1.00m is reserved at a position 1.82m away from the bottom of the bag net 3 and sewed on one side of the upper surface (the side with the floaters 5) (see fig. 1 and 2).
The assembly of the jellyfish stopping and separating net piece 11 is that after the whole single conical bag-shaped main net and the steel cable are assembled, the jellyfish stopping and separating net piece 11 is obliquely and additionally arranged in the single conical bag-shaped main net from a net opening to a bag net 3, a 10m (129 mesh) edge of the net piece is connected to a lower net line of a mouth door of the single conical bag-shaped main net, a 4m (51.5 mesh) edge is connected to a lateral net line 7 on the right side, a 12.15m (156 mesh) edge is obliquely and backwards connected to an upper net piece in the single conical bag-shaped main net, a 6.91m (89 mesh) edge is obliquely and backwards connected to a left side net piece of the single conical bag-shaped main net, and the jellyfish stopping and separating net piece 11 extends backwards to form two inclined edges, and the included angle is aligned with the tail end of the jellyfish releasing opening 14. From there, a jellyfish-releasing opening 14 of 1.00m was left in the side seam toward the net opening, and the remaining side seams 7 were wound two by two (see fig. 2 and 3).
The method comprises the steps of integrally assembling a macrobrachium nipponensis expansion net unit, connecting an upper line and a lower line on two single conical bag-shaped main nets after assembling a single conical bag-shaped main net coat, a related steel cable, a buoy and a jellyfish blocking and separating net sheet 11 and the like, sequentially assembling 6 single conical bag-shaped main nets into 1 macrobrachium nipponensis expansion net unit (the macrobrachium nipponensis expansion net for short), respectively binding 1 vertical rod 15 on two sides of the macrobrachium nipponensis expansion net unit, connecting cross lines 16 at the upper end and the lower end of the vertical rod 15, connecting an anchor line 17 and a large floating ball line 19 at the folded part of the cross lines 16, connecting the anchor line 17 with an iron anchor 18, and connecting the large floating ball line 19 with a large floating ball 20 (see fig. 1).
Example 1
The test fishing boat is of Chang Li Ji Chang Fishes 06092 in Hebei province, is wooden, and has a main machine power of 364kW, a model length of 30.00m, a model width of 6.10m and a model depth of 2.60 m. And (4) carrying out sea going operation on 50 crayfish net stretching units with the nets at a time. Crew 5 persons. The ship is provided with a net hauler, a collision prevention instrument, a GPS (global positioning system) satellite guide instrument, a fish finder and other equipment.
During the period from 8 months 15 days to 9 months 15 days in 2016, a giant freshwater shrimp net fishing production experiment is carried out on the sea by using a Jichang fishing 06092 fishing boat. The fishing farm is a Liaodong gulf fishing farm in the southeast of Changli in Hebei province, etc. The main capture object is Acetes chinensis Hansen with the body length of 35-40 mm. The operation water layer is the middle upper layer. The depth of water in the operation area is about 25 m.
The fishing method comprises the following steps: and (3) releasing the net in the weather without strong wind (6-grade or below), after the fishing boat arrives at a fishing ground, adjusting the length of a large floating headrope according to the image of the fish detector to determine an operation water layer, then releasing the net in a head-on manner, and deflecting 10-20 degrees in the direction of the head-on slip of the transverse flow when throwing the net. When the crayfish is off the net, the ship is at a speed of 4-5 knots, 1 person throws the iron anchor, after the iron anchor is firmly grabbed on the seabed, the large floating ball is thrown along with the iron anchor, 2 persons throw the net, 1 person arranges the net, and then the crayfish net is thrown in sequence. Hauling the net in a slow flow, wherein the hauling time is at least 2 hours away from the net throwing time generally, the ship is positioned at the leeward end of the net, the large floating ball is fished up, the large floating ball line is pulled up, the anchor line is twisted by a net hauler, and the iron anchor is pulled to the ship; and then drawing the crayfish net onto the ship, loosening the purse line at the bottom of the capsule, and pouring out the catch.
The total number of the net times of the sea test is 24, the number of the captured macrobrachium nipponensis is about 50 tons, the total yield is 20 ten thousand yuan, and the net time yield of one macrobrachium nipponensis net unit is 41.67kg on average.
As a result: during the test period, no jellyfish is found in the giant freshwater shrimp net, and the net explosion phenomenon does not occur.
The technical characteristics of adding the jellyfish blocking and separating net sheet in the shrimp net are not limited to the shrimp net specification in the embodiment, and the shrimp net can also be suitable for other shrimp nets with similar specifications and shapes.
Claims (4)
1. A monomer cone-shaped bag-shaped main net capable of releasing jellyfish is characterized by comprising a monomer cone-shaped bag-shaped main net body, an upper bole (4), a lower bole (8), a lateral bole (7), a floater (6), a sinker (10) and a jellyfish blocking and separating net sheet (11); the monomer cone-shaped bag-shaped main netting consists of a flange net (1), a body net (2) and a bag net (3); the upper bolch (4), the lower bolch (8) and the lateral bolch (7) respectively penetrate through edge meshes on the upper part, the lower part and the two sides of a net opening of the monomer cone-shaped bag-shaped main netting, the floater (6) penetrates through the floater bolch (5) and the upper bolch (4) and is tied to be called an upper bolch, and the sinker (10) penetrates through the sinker (9) and the lower bolch (8) and is tied to be called a lower bolch; the jellyfish blocking and separating mesh (11) is in an irregular quadrilateral shape and is provided with two right-angle edges and two bevel edges; one right-angle side of the jellyfish blocking and separating net piece (11) is horizontally assembled on the foot line, the other right-angle side of the jellyfish blocking and separating net piece (11) is vertically assembled on the foot line (7), one bevel edge of the jellyfish blocking and separating net piece (11) is gradually assembled on the upper net piece in the monomer conical bag-shaped main net garment in an inclined mode backwards and upwards, the other bevel edge is assembled on the side net piece in the monomer conical bag-shaped main net garment in an inclined mode backwards and upwards from a net opening, a section is reserved at the position, close to the rear, of the middle of the side seam of the upper side edge of the monomer conical bag-shaped main net garment and is used as a jellyfish releasing opening (14), and the included angle of the two bevel edges, extending backwards, of the jellyfish blocking and separating net piece (11) is coincided with the tail end of the jellyfish;
the length of a right-angle edge of the jellyfish blocking and separating net sheet (11) connected with the lower net is 10m and 129 meshes, the length is the length of the netting after the netting is contracted, and the contraction coefficient of the netting is 0.707;
the length of a right-angle edge of the jellyfish blocking separation net sheet (11) connected with the sidelines (7) is 4m and 51.5 meshes, the length is the length of the netting after the netting is contracted, and the contraction coefficient of the netting is 0.707;
the length of the bevel edge of the jellyfish blocking separation net sheet (11) connected with the net sheet on the upper surface in the monomer conical bag-shaped main net is 12.15m and 156 meshes, the length is the length of the net after the net is shrunk, and the shrinkage coefficient of the net is 0.707;
the length of the other bevel edge of the jellyfish blocking separation net sheet (11) connected with the side net sheet is 6.91m and 89 meshes, the length is the length of the netting after the netting is shrunk, and the netting shrinkage factor is 0.707.
2. A jellyfish releasable unitary pyramidal pouch-shaped primary net according to claim 1, wherein the jellyfish release opening (14) is 1.00m in length.
3. A macrobrachium nipponensis expanding net capable of releasing jellyfish comprises a macrobrachium nipponensis expanding net unit, a vertical rod (15), a cross line (16), an anchor line (17), an iron anchor (18), a large floating ball line (19) and a large floating ball (20); the macrobrachium nipponensis sheet net unit is formed by connecting 5-6 identical monomer cone-shaped bag-shaped main nets according to any one of claims 1-2 in parallel in sequence through an upper line and a lower line, and vertical rods (15) are respectively bound on two sides of the macrobrachium nipponensis sheet net unit; the forked line (16) is respectively connected with the upper end and the lower end of the vertical rod (15), the folded part of the forked line (16) is connected with the anchor line (17), and the other end of the anchor line (17) is connected with the iron anchor (18); the vertical rods (15), the floating headropes (5) and the sinkers (9) keep the net vertically open, and the iron anchors (18) at the two ends keep the net horizontally open through the anchor headropes (17) and the cross headropes (16); one end of the big floating ball line (19) is connected to the folding part of the cross line (16), the other end of the big floating ball line is connected with a big floating ball (20) floating on the water surface, and the length of the big floating ball line (19) is adjusted to lay the crayfish net in the required water depth so as to be aimed and fished.
4. An assembly method of a macrobrachium nipponensis expanded net capable of releasing jellyfish comprises the assembly of a single conical bag-shaped main netting, the assembly of a steel cable, the assembly of a floater (6) and a sinker (10), the assembly of a jellyfish blocking and separating net sheet (11) and the integral assembly of a macrobrachium nipponensis expanded net unit;
firstly assembling the whole monomer cone-shaped bag-shaped main net, a steel cable, a floater (6) and a sinker (10), and then reserving a jellyfish release opening (14) at the middle rear part of the side seam of one side of the monomer cone-shaped bag-shaped main net with the floater line (5), wherein the jellyfish release opening is not wound and pricked; the jellyfish blocking and separating net piece (11) is obliquely and backwards arranged in the conical bag-shaped main net from the net opening, a right-angle edge of the jellyfish blocking and separating net piece (11) is connected to a lower line of the single conical bag-shaped main net, the other right-angle edge of the jellyfish blocking and separating net piece (11) is connected to a side line of the single conical bag-shaped main net, one oblique edge of the jellyfish blocking and separating net piece (11) is obliquely connected to an upper net in the single conical bag-shaped main net backwards, the other oblique edge of the jellyfish blocking and separating net piece (11) is obliquely and upwards connected to a side net in the single conical bag-shaped main net, and the included angle of two oblique edges of the jellyfish blocking and separating net piece (11) which are obliquely backwards aligned with the tail end of the jellyfish releasing opening (14);
the whole assembly of the macrobrachium nipponensis expanded net unit is that after the monomer conical bag-shaped main netting, the related steel cables, the floats (6), the sinkers (10) and the jellyfish blocking and separating net sheets (11) are assembled to form the monomer conical bag-shaped main net, two pairs of the elementary lines and the underlines of the monomer conical bag-shaped main net are sequentially connected, every 5-6 identical monomer conical bag-shaped main nets of any one of claims 1-2 are assembled into 1 macrobrachium nipponensis expanded net unit, 1 vertical rod (15) is respectively bound on two sides of the macrobrachium nipponensis expanded net unit, the upper end and the lower end of each vertical rod (15) are connected with cross lines (16), the folded part of each cross line (16) is connected with an anchor line (17) and a large floating ball (19), the anchor line (17) is connected with an iron anchor (18), and the large floating ball (19) is connected with a large floating ball (20).
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| CN109914350A (en) * | 2019-04-11 | 2019-06-21 | 苏州热工研究院有限公司 | A kind of small-sized marine growth retains the intercept net component in net and nuclear power plant's intake sea area |
| CN111972364B (en) * | 2020-09-01 | 2022-11-01 | 中国水产科学研究院南海水产研究所 | Emergency shrimping purse seine and use method thereof |
| CN111972361B (en) * | 2020-09-01 | 2022-04-29 | 中国水产科学研究院南海水产研究所 | Marine nuclear power station intake shrimp interception net |
| CN113615650B (en) * | 2021-08-17 | 2022-11-11 | 中国水产科学研究院东海水产研究所 | Efficient fishing method for fishes in large-scale aquaculture facility |
| CN114568395B (en) * | 2022-03-11 | 2023-03-31 | 温州市公用事业发展集团有限公司珊溪水源保护分公司 | Fixed net |
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| CN2779864Y (en) * | 2005-02-22 | 2006-05-17 | 李忠茂 | Under ice multipocket net for shrimping |
| KR100625012B1 (en) * | 2005-09-15 | 2006-09-15 | 이호진 | Device for ejecting jellyfish |
| CN200938798Y (en) * | 2006-08-02 | 2007-08-29 | 中国水产科学研究院东海水产研究所 | Device for releasing scaleph by trawl |
| CN201349447Y (en) * | 2009-01-19 | 2009-11-25 | 上海海洋大学 | Cyanea nozakii net sheet separation device of fishing net |
| CN201957609U (en) * | 2010-11-22 | 2011-09-07 | 中国水产科学研究院东海水产研究所 | Set-net separate jellyfish release device |
| KR101298310B1 (en) * | 2011-07-11 | 2013-08-20 | 이종호 | Fishing net for separating and emitting jellyfish |
| CN203675885U (en) * | 2013-11-28 | 2014-07-02 | 上海海洋大学 | Novel stow net mouth structure |
| CN106070100B (en) * | 2016-06-21 | 2018-11-13 | 中国水产科学研究院南海水产研究所 | A kind of jellyfish remover for trawlnet |
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