阅读说明：本技术 一种调查水库鱼类资源的三层多网目复合刺网装置 (Three-layer multi-mesh composite gill net device for investigating reservoir fish resources ) 是由 马玉兴 廖传松 郭传波 于 2021-10-18 设计创作，主要内容包括：本发明公开一种调查水库鱼类资源的三层多网目复合刺网装置,包括用于捕获上层鱼类的浮网和用于捕获底层鱼类的沉网,浮网位于沉网上方,浮网和沉网均包括多层网衣,多层网衣顶端通过上纲连接有若干泡沫浮子,多层网衣底端通过下纲连接有若干铅制沉子；多层网衣包括两相对设置的外网衣,两外网衣间设置有内网衣,外网衣网目大小为内网衣网目大小两倍,内网衣和外网衣分别由12种不同网目渔网组成且由拉链连接,本发明能够实现利用三层多网目复合刺网,捕捞效果更好,捕捞效率更高,一方面可提高鱼类调查效率,另一方面可大量节约整理网具、摘取渔获物的时间,提高操作效率,并达到可局部修补的目的。(The invention discloses a three-layer multi-mesh composite gill net device for investigating reservoir fish resources, which comprises a floating net for capturing upper-layer fishes and a sinking net for capturing bottom-layer fishes, wherein the floating net is positioned above the sinking net, the floating net and the sinking net both comprise multilayer nettings, the top ends of the multilayer nettings are connected with a plurality of foam floaters through headlines, and the bottom ends of the multilayer nettings are connected with a plurality of lead sinkers through bottom lines; the multi-layer netting comprises two outer netting arranged oppositely, an inner netting is arranged between the two outer netting, the mesh size of the outer netting is twice that of the inner netting, and the inner netting and the outer netting are respectively composed of 12 different mesh fishing nets and are connected through zippers.)

1. A three-layer multi-mesh composite gill net device for investigating reservoir fish resources comprises a floating net (10) for catching upper-layer fishes and a sinking net (11) for catching bottom-layer fishes, wherein the floating net (10) is positioned above the sinking net (11), and is characterized in that the floating net (10) and the sinking net (11) both comprise multilayer net clothes, the top ends of the multilayer net clothes are connected with a plurality of foam floaters (1) through upper steel wires (3), and the bottom ends of the multilayer net clothes are connected with a plurality of lead sinkers (2) through lower lines (4);

the multilayer netting comprises two outer netting arranged oppositely, an inner netting is arranged between the two outer netting, the top ends of the two outer netting and the top end of the inner netting are connected and wound on the foam floater (1) through an upper steel wire (3), and the bottom ends of the two outer netting and the bottom end of the inner netting are connected through a lower steel wire (4);

the inner netting comprises a plurality of first single-layer meshes (5) which are detachably connected, and the outer netting comprises a plurality of second single-layer meshes (6) which are detachably connected.

2. The three-layer multi-mesh composite gill net device for investigating reservoir fish resources as claimed in claim 1, wherein: the number of the first single-layer meshes (5) is 12, the mesh sizes of the 12 first single-layer meshes (5) are different, the mesh size of the first single-layer mesh (5) is a first numerical value, and the first numerical value range is 5 mm-55 mm.

3. The three-layer multi-mesh composite gill net device for investigating reservoir fish resources as claimed in claim 2, wherein: the number of the second single-layer meshes (6) is 12, the two second single-layer meshes (6) are arranged corresponding to the first single-layer mesh (5), the mesh size of the second single-layer meshes (6) is a second numerical value, and the second numerical value is twice of the first numerical value.

4. The three-layer multi-mesh composite gill net device for investigating reservoir fish resources as claimed in claim 1, wherein: any one first single-layer mesh (5) is detachably connected with the adjacent first single-layer mesh (5) through a zipper (7), and any one second single-layer mesh (6) is detachably connected with the adjacent second single-layer mesh (6) through the zipper (7).

5. The three-layer multi-mesh composite gill net device for investigating reservoir fish resources as claimed in claim 1, wherein: the gravity of the lead sinker (2) on the floating net (10) is smaller than that of the foam floater (1) on the floating net (10), and the gravity of the lead sinker (2) on the sinking net (11) is larger than that of the foam floater (1) on the floating net (10).

6. The three-layer multi-mesh composite gill net device for investigating reservoir fish resources as claimed in claim 1, wherein: the foam float (1) is characterized in that a through hole (8) is formed in the center of the foam float (1), the upper steel wire (3) penetrates through the through hole (8), the upper steel wire (3) is in sliding connection with the foam float (1), a through groove (9) is formed in the foam float (1), and the through groove (9) is communicated with the through hole (8).

7. The three-layer multi-mesh composite gill net device for investigating reservoir fish resources as claimed in claim 1, wherein: the upper line (3) and the lower line (4) are both made of polyethylene.

8. The three-layer multi-mesh composite gill net device for investigating reservoir fish resources as claimed in claim 1, wherein: the distance between the plurality of foam floaters (1) is 20cm, and the distance between the plurality of lead sinkers (2) is 20 cm.

Technical Field

The invention relates to the technical field of reservoir fish resource investigation, in particular to a three-layer multi-mesh composite barbed wire mesh device for investigating reservoir fish resources.

Background

Fishes are important components of reservoir ecosystems in China, are various in types, wide in feeding habits and rich in resources, and have very important functions in energy transfer and material circulation of reservoir food networks. The investigation on the structure and resource quantity of the reservoir fish community is the basis of fishery fishing and stocking management and health evaluation of a reservoir ecosystem. The investigation and sampling are the difficult and key points for evaluating reservoir fish resources, and proper sampling devices are selected according to different reservoir habitats and investigation objects.

The stinger sampling is widely applied to reservoir fish resource investigation due to simple operation and high efficiency, and the stinger for investigating fish resources commonly used internationally is mostly manufactured or improved based on European Standards (BSI Standards Publication), generally manufactured by adopting single-layer netting, and widely used in fish resource investigation research of various countries in the world. However, due to differences in individual size, body type, swimming ability and the like among different populations in the fish community, the water depth of the reservoir is large, the single-layer multi-mesh composite barbed net has poor catching effect on large individual fish individuals, small fish populations or small individual fishes with high proportion are often caught, the small individual fishes are dominant in the fish catch, and an error exists between the actual situation of the fish community and the small individual fishes. In addition, the single-layer multi-mesh composite barbed net is easy to damage, the use cost is high, the operation is complex and easy to damage when the fisheries are picked, the whole composite barbed net is difficult to recycle after the net sheets are damaged, the waste is easy to cause, and the fishing efficiency is also influenced. Therefore, it is necessary to innovate a single-layer multi-mesh seine, which improves the efficiency of fish investigation on the one hand, and improves the operation efficiency and the resource utilization efficiency by realizing local repair on the other hand.

Disclosure of Invention

The invention aims to provide a three-layer multi-mesh composite barbed net device for investigating reservoir fish resources, which solves the problems in the prior art, can realize the utilization of the three-layer multi-mesh composite barbed net, has better catching effect and higher catching efficiency by adding a special netting and changing the mesh size, combination mode and netting connection mode, can improve the fish investigation efficiency on one hand, can greatly save the time for arranging nets and picking up fish catches on the other hand, improves the operation efficiency, and achieves the purpose of local repair.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a three-layer multi-mesh composite gill net device for investigating reservoir fish resources, which comprises a floating net for capturing upper-layer fishes and a sinking net for capturing bottom-layer fishes, wherein the floating net is positioned above the sinking net, the floating net and the sinking net both comprise multilayer nettings, the top ends of the multilayer nettings are connected with a plurality of foam floaters through head line lines, and the bottom ends of the multilayer nettings are connected with a plurality of lead sinkers through foot lines;

the multilayer netting comprises two outer netting arranged oppositely, an inner netting is arranged between the two outer netting, the top ends of the two outer netting and the top end of the inner netting are connected and wound on the foam floater through an upper line, and the bottom ends of the two outer netting and the bottom end of the inner netting are connected through a lower line;

the inner netting comprises a plurality of first single-layer meshes which are detachably connected, and the outer netting comprises a plurality of second single-layer meshes which are detachably connected.

Preferably, the number of the first single-layer meshes is 12, the mesh sizes of the 12 first single-layer meshes are different, the mesh size of the first single-layer mesh is a first value, and the first value range is 5 mm-55 mm.

Preferably, the number of the second single-layer meshes is 12, two second single-layer meshes are arranged corresponding to the first single-layer mesh, the mesh size of the second single-layer meshes is a second numerical value, and the second numerical value is twice of the first numerical value.

Preferably, any one of the first single-layer mesh sheets with different meshes is detachably connected with the adjacent first single-layer mesh sheet through a zipper, and any one of the second single-layer mesh sheets is detachably connected with the adjacent second single-layer mesh sheet through the zipper.

Preferably, the gravity of the lead sinker on the floating net is smaller than the buoyancy of the foam floater on the floating net, and the gravity of the lead sinker on the sinking net is larger than the buoyancy of the foam floater on the floating net.

Preferably, a through hole is formed in the center of the foam floater, the upper steel line penetrates through the through hole, the upper steel line is connected with the foam floater in a sliding mode, a through groove is formed in the foam floater, and the through groove is communicated with the through hole.

Preferably, the upper line and the lower line are both made of polyethylene.

Preferably, the distance between a plurality of the foam floaters is 20cm, and the distance between a plurality of the lead sinkers is 20 cm.

The invention discloses the following technical effects:

1. the floating net and the sinking net are arranged into the multilayer netting, the multilayer netting has strong winding and wrapping functions on large individual fishes and small individual fishes, the fishing efficiency is higher due to the arrangement of the multilayer netting, the types and sizes of the fish catches are richer, and the real type composition, the individual size, the density and the biomass characteristics of reservoir fish resources can be more accurately reflected.

2. The foam floater is designed, so that the time for arranging the net and picking up the fish catch is greatly saved, and the fish investigation efficiency is further improved.

3. The first single-layer meshes are detachably connected, the second single-layer meshes are detachably connected, when a certain first single-layer mesh or second single-layer mesh is damaged, the first single-layer mesh or second single-layer mesh can be replaced, the purpose of local repair is achieved, the service life of the fishing net is prolonged, and the use cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a main body part of a floating net and a sinking net;

FIG. 2 is a schematic view of the construction of an inner netting;

FIG. 3 is a schematic view of the inner diameter structure of a mesh;

FIG. 4 is a schematic view of the connection of the foam float to the travel cord;

FIG. 5 is a schematic view showing a fishing winding state;

the floating net comprises a foam floater 1, a lead sinker 2, a steel wire 3, a lower line 4, a first single-layer net piece 5, a second single-layer net piece 6, a zipper 7, a through hole 8, a through groove 9, a floating net 10 and a sinking net 11.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The invention provides a three-layer multi-mesh composite barbed net device for investigating reservoir fish resources, which comprises a floating net 10 for capturing upper-layer fishes and a sinking net 11 for capturing bottom-layer fishes, wherein the floating net 10 is positioned above the sinking net 11, the floating net 10 and the sinking net 11 both comprise multilayer nettings, the top ends of the multilayer nettings are connected with a plurality of foam floaters 1 through upper steel wires 3, and the bottom ends of the multilayer nettings are connected with a plurality of lead sinkers 2 through lower lines 4; the multilayer netting comprises two outer netting arranged oppositely, an inner netting is arranged between the two outer netting, the top ends of the two outer netting and the top end of the inner netting are connected through an upper steel wire 3 and wound on a foam floater 1, and the bottom ends of the two outer netting and the bottom end of the inner netting are connected through a lower steel wire 4; the inner netting comprises a plurality of first single-layer net pieces 5 which are detachably connected, and the outer netting comprises a plurality of second single-layer net pieces 6 which are detachably connected.

The floating net 10 is used for capturing upper fishes, the sinking net 11 is used for capturing bottom fishes, fishery resource investigation can be carried out on different water areas by using the floating net 10 or the sinking net 11 according to actual use requirements, or the floating net 10 and the sinking net 11 are used simultaneously, the mesh of the inner net coat is smaller than that of the outer net coat, and the inner net coat is located between the two outer net coats, so that small individual fishes can still be captured by the inner net coat after passing through the meshes of the outer net coats, and then small individual fishes are captured Individual size, density and biomass characteristics.

In this technical scheme, the interior net clothing comprises a plurality of first individual layers net pieces 5 that can dismantle the connection, and the outer net clothing comprises a plurality of second individual layers net pieces 6 that can dismantle the connection, and when arbitrary first individual layer net piece 5 or second individual layer net piece 6 damaged, can net piece 6 to this first individual layer net piece 5 or second individual layer and change, and then improve the life of outer net clothing and interior net clothing.

In the technical scheme, the top ends of a plurality of first single-layer net pieces 5 and a plurality of second single-layer net pieces 6 are arranged on the head line 3 in a penetrating mode, the bottom ends of the first single-layer net pieces 5 and the second single-layer net pieces 6 are arranged on the head line 4 in a penetrating mode, the foam floater 1 provides upward buoyancy for the inner netting and the two outer nettings, and the lead sinker 2 provides downward gravity for the inner netting and the two outer nettings so that the inner netting and the two outer nettings can be unfolded normally in water.

In the technical scheme, the height of the first single-layer net piece 5 and the length of the second single-layer net piece 6 of the floating net 10 are both 5m and 2.5m, the total length of the floating net 10 is 30m, the height of the first single-layer net piece 5 and the length of the second single-layer net piece 6 of the sinking net 10 are both 1.5m and 2.5m, and the total length of the sinking net 10 is 30 m.

According to the further optimization scheme, the number of the first single-layer meshes 5 is 12, the mesh sizes of the 12 first single-layer meshes 5 are different, the mesh size of the first single-layer mesh 5 is a first numerical value, and the first numerical value range is 5 mm-55 mm. Wherein the first value refers to the distance between the inner edges of two diagonal knuckles when the mesh is sufficiently straightened without elongation. The inner netting is composed of 12 first single-layer meshes 5 with different mesh specifications and the length of each mesh is 2.5, the range of a first numerical value of the mesh size is 2a, the arrangement sequence of the meshes is 2a which is 43mm, 19.5mm, 6.25mm, 10mm, 55mm, 8mm, 12.5mm, 24mm, 15.5mm, 5mm, 35mm and 29mm in sequence, the mesh size is established according to the international standard of European fishing gear, the variety and size of a fishing object can be enriched, and the diameters of the meshes are r which is 0.20mm, 0.15mm, 0.10mm, 0.12mm, 0.25mm, 0.10mm, 0.12mm, 0.17mm, 0.15mm, 0.10mm, 0.20mm and 0.17mm in sequence.

In this technical scheme, first individual layer net piece 5 can be nylon palm silk screen.

According to the further optimization scheme, the number of the second single-layer meshes 6 is 12, the two second single-layer meshes 6 are arranged corresponding to the first single-layer mesh 5, the mesh size of the second single-layer meshes 6 is a second numerical value, and the second numerical value is twice of the first numerical value. Two second single-layer meshes 6 are respectively arranged on two sides of any one first single-layer mesh 5, the meshes of the second single-layer meshes 6 are twice of the meshes of the first single-layer meshes 5 in opposite positions, and the value range of a second value is 4 a.

According to the further optimization scheme, any first single-layer net piece 5 is detachably connected with the adjacent first single-layer net piece 5 through a zipper 7, and any second single-layer net piece 6 is detachably connected with the adjacent second single-layer net piece 6 through the zipper 7. The adjacent first individual layer net piece 5 or the adjacent second individual layer net piece 6 are sewed through the zip fastener 7 with the diameter of 1cm, the disassembly is convenient, when any first individual layer net piece 5 or second individual layer net piece 6 is damaged, the damaged first individual layer net piece 5 or second individual layer net piece 6 can be taken out and replaced through the zip fastener 7, and whether the zip fastener 7 on the two layers of outer net clothes needs to be pulled open or not can be judged by combining with actual conditions when the fish catch object is picked up, so that the fish catch object between the outer net clothes and the inner net clothes can be picked up.

In a further optimization scheme, the gravity of the lead sinker 2 on the floating net 10 is smaller than the buoyancy of the foam floater 1 on the floating net 10, and the gravity of the lead sinker 2 on the sinking net 11 is larger than the buoyancy of the foam floater 1 on the floating net 10. The floating net 10 is needed to be used for catching the fishes at the middle and upper layers, and the buoyancy generated by the foam floater 1 is 1.5-2.5 times of the sinking force generated by the lead sinker 2. The bottom layer fish catching needs to use the sinking net 11, and the sinking force generated by the lead sinker 2 is 1.5-2 times of the buoyancy generated by the foam floater 1.

According to the further optimization scheme, the through hole 8 is formed in the center of the foam floater 1, the head line 3 penetrates through the through hole 8, the head line 3 is connected with the foam floater 1 in a sliding mode, the through groove 9 is formed in the foam floater 1, and the through groove 9 is communicated with the through hole 8. The central position of the foam floater 1 is in a hole shape, so that the steel wire 3 can be conveniently penetrated and arranged, and then the foam floater 1 can move and be fixed along the steel wire 3, in the prior art, when the netting gear is arranged, the foam floaters 1 are easily doped together, and through the through groove 9 formed in the foam floater 1, the foam floater 1 can move and be fixed on the steel wire 3, so that the netting gear is conveniently arranged, and the fish investigation efficiency is improved.

In a further optimization scheme, the upper line 3 and the lower line 4 are both made of polyethylene. The upper wire 3 is a wire rope for bearing the main force of the net on the upper edges of the inner net and the outer net, and the lower wire 4 is a wire rope for bearing the main force on the lower edges of the inner net and the outer net. The lower line 4 of the sinker net 11 is also called the lacing line, and the use modes of the upper line 3 and the lower line 4 belong to the prior art, which are not described in detail herein.

In the technical scheme, the dimensions of the upper line 3 and the lower line 4 are preferably 6mm in diameter and 30m in length.

Further optimizing the scheme, the distance between a plurality of foam floaters 1 is 20cm, and the distance between a plurality of lead sinkers 2 is 20 cm. 1 foam floater 1 is arranged on an upper steel wire 3 every 20cm, and 1 lead sinker 2 is arranged on a lower steel wire 4 every 20cm, so that the inner net and the outer net can vertically extend in water. The lead sinker 2 is connected with the lower edges of the inner and outer nettings through a short connecting rope, and the foam floater 1 is connected with the upper edges of the inner and outer nettings through a short connecting rope and a long connecting rope. The connection mode of the foam floater 1 and the head line 3 and the connection mode of the lead sinker 2 and the foot line 4 are the prior art and are not described in detail herein.

The actual operation process is as follows:

in the actual operation process, in the evening, 5: 00-7: 00, at selected sampling points in a reservoir, three layers of multi-mesh floating nets 10 and three layers of multi-mesh sinking nets 11 are combined for use at each sampling point, the number of the sampling points is determined according to the size of the water surface, and the real-time water environment is measured when the sampling points are used. One end of the multi-mesh composite barbed wire net is placed into water from a sampling ship, the foam floater 1 floats on the water surface, a plurality of layers of netting are placed into the water at a constant speed when the sampling ship advances, the foam floater 1 can be rotationally clamped on the upper steel wire 3 while the netting gear is placed, and the small red flag or the floating ball is tied on the upper steel wire 3 and stands on the water surface to play a role in marking and fixing the netting.

The multi-layer net of the floating net vertically extends in the water under the action of the foam floater 1 and the lead sinker 2. When the floating net 10 is arranged and the buoyancy of the foam floater 1 is larger than the gravity of the lead sinker 2, the multilayer netting is arranged on the surface layer in water; when the sinking net 11 is arranged, the buoyancy of the foam floater 1 is smaller than the gravity of the lead sinking piece 2, the multilayer netting is arranged on the bottom layer in water, and the drawing action of the foam floater 1 and the lead sinking piece 2 plays a role in fixing the position of the multilayer netting in water.

Taking up the net in the next morning at 5: 00-7: 00, lifting the long connecting rope and the lead sinker 2 at one end, then retracting the multilayer netting at a constant speed in the advancing process of the sampling boat, and finally lifting the long connecting rope and the lead sinker 2 at one end; when the catch captured by the net is picked off, the actual situation can be combined to judge whether the zipper 7 of the outer netting needs to be opened, and the efficiency of picking the catch can be improved by unzipping the zipper 7. Separately collecting the catches at different sampling points, bringing the catches back to the room for species identification, respectively identifying, counting and weighing the various catches of the floating net 10 and the sinking net 11, measuring the body length, calculating the density and biomass of the various catches captured in unit time, and finally sliding the foam floater 1 on the upper steel wire 3 to one end and tying the foam floater to obtain the fishing net.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.