Fishing gear

Abstract

To provide a novel fishing tool that can hold a proper working posture underwater by a simple structure, which can increase the catch of fish with fishing tools.SOLUTION: A fishing tool 1, 11, 21, 31, 41 comprises an underwater working posture holder in at least part of it.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to fishing gear, and more particularly to fishing gear suitable for increasing the amount of fish caught. [Background technology]

[0002] Generally, nets and ropes are widely used as fishing gear for catching fish and culturing fish, and many different types of fishing gear are used depending on the fishing method, etc.

[0003] For example, purse seine nets, trawl nets, fixed nets, fish cage nets, longlines, etc. are used.

[0004] These fishing gears are installed and used in areas where both seawater and freshwater exist, as well as in brackish water, which is a mixture of both. In this specification, seawater, freshwater, and brackish water are referred to as water, and seawater, freshwater, and brackish water are referred to as underwater.

[0005] These fishing gears are used for catching fish by being held in a predetermined position in the water in an appropriate operating position according to the fishing purpose, but external forces act on each fishing gear, causing it to change its appropriate operating position, and it is impossible to prevent these external forces.

[0006] For example, fishing gear that is used in a fixed state, such as fixed nets and fish preserve nets, is subject to external forces that deform the net due to fluctuations in water currents and climate in the environment in which it is installed.

[0007] Furthermore, for purse seine nets, trawl nets, longlines, etc., they must be deployed and transformed into the appropriate operating position as quickly as possible after being dropped into the water from the fishing boat, so that fishing can begin as soon as possible, but water acts as a resistance force (external force) that hinders deployment and transformation.

[0008] Therefore, in order to maintain a predetermined operating posture in the water, these fishing gears are equipped with metal sinkers at the bottom of the gear and floats, mainly made of resin, at the top of the gear (see, for example, the purse seine net in Patent Document 1).

[0009] Furthermore, in fixed nets, a large number of ropes attached to anchors are stretched between the net and the bottom of the water to maintain a predetermined shape (see Patent Document 2). [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Publication No. 6-303877 [Patent Document 2] Japanese Patent Application Laid-Open No. 2018-000098 Summary of the Invention [Problem to be solved by the invention]

[0011] The various means for properly maintaining the operating position of the above-mentioned conventional fishing gear in the water were attached to the fishing gear after the fact, and therefore it was often impossible to maintain the fishing gear in the ideal operating position.

[0012] The present invention has been made in consideration of these points, and aims to provide fishing gear that can properly maintain its operating posture in the water with a simple configuration, thereby increasing the amount of fish caught by the fishing gear. [Means for solving the problem]

[0013] In order to achieve the above object, a fishing gear according to a first aspect of the present invention is characterized in that at least a part of the fishing gear is provided with a member for maintaining an underwater operating posture.

[0014] According to this first aspect of the present invention, the underwater operating posture maintaining member is provided as part of the fishing gear itself, so unlike conventional fishing gear that uses separate sinkers or floaters, the structure is simple and the fishing gear's operating posture in the water can be properly maintained, thereby enabling an increase in the catch volume using the fishing gear.

[0015] In addition, a fishing gear of a second aspect of the present invention is characterized in that, in the first aspect, the underwater operating posture maintaining member is provided at a part of the fishing gear that is deformed from its standard operating posture when subjected to external forces when the fishing gear moves relative to the water underwater.

[0016] According to this second aspect of the present invention, the underwater operating posture maintaining member is provided in a part of the fishing gear that is deformed from its standard operating posture when subjected to external forces when moving relative to the water, so that the fishing gear can maintain the appropriate operating posture, the standard operating posture, without deforming even when subjected to external forces in the water, thereby further improving the catch.

[0017] Furthermore, a fishing gear of a third aspect of the present invention is characterized in that, in the first or second aspect, the underwater operating posture maintaining member is formed from a PTFE-containing material, and the PTFE-containing material has a higher specific gravity than the materials forming other parts of the fishing gear.

[0018] According to this third aspect of the present invention, the underwater operating posture maintaining member is formed from a PTFE-containing material which has a higher specific gravity than other materials, and is therefore formed to have a higher specific gravity than the materials of other parts of the fishing gear.Therefore, the weight of the underwater operating posture maintaining member, which has a higher specific gravity, can maintain the fishing gear in the appropriate operating posture, which is the standard operating posture, and further improvement in the catch can be achieved.

[0019] Furthermore, a fishing gear according to a fourth aspect of the present invention is characterized in that, in each of the first to third aspects, the fishing gear is a fishing net, the underwater operating posture maintaining member is formed from a PTFE-containing net thread, and the PTFE-containing net thread has a higher specific gravity than the net threads forming other parts of the fishing net.

[0020] According to this fourth aspect of the present invention, a part of the underwater operating posture maintaining member of the fishing net, which is one aspect of fishing gear, is formed from PTFE-containing net thread, and this PTFE-containing net thread has a higher specific gravity than the net threads forming other parts of the fishing net.Therefore, the weight of the PTFE-containing net thread, which is the underwater operating posture maintaining member with a higher specific gravity, can maintain the fishing gear in an appropriate operating posture, which is the standard operating posture, and the catch volume of the fishing net can be increased.

[0021] The fishing gear of the fifth aspect of the present invention is characterized in that the fishing net of the fourth aspect is a purse seine net, and when the net is cast into the water and sinks, it is provided with the underwater operating posture maintaining member in a large mesh area near the top of the lower mouth of the net, which becomes the bottom underwater, and in a band net area of ​​a predetermined longitudinal width extending from the top to the bottom of the net at both longitudinal ends of the large mesh area.

[0022] According to this fifth aspect of the present invention, when the purse seine net is cast into the water, the large mesh area and the band net area, which are made of PTFE-containing net threads with a high specific gravity, sink before the net threads with a low specific gravity.As a result, the purse seine net is deployed into the water early while maintaining its standard operating posture, which is the ideal shape during operation.This means that fish can be captured within the purse seine net without escaping from the bottom, allowing for smooth purse seine fishing and an increase in catch.

[0023] A fishing gear of a sixth aspect of the present invention is characterized in that the fishing net of the fourth aspect is a trawl net, and is provided with the underwater operating posture maintaining member in the bottom area that becomes the bottom underwater when the net is being towed underwater.

[0024] According to this sixth aspect of the present invention, when a trawl net is cast into the water, the bottom area in the water, which is made of PTFE-containing net threads with a high specific gravity, sinks before the net threads with a low specific gravity, so that the mouth of the trawl net is opened sufficiently in the vertical direction and the shape of the entire trawl net is deployed into the water early while maintaining the standard operating posture, which is the ideal shape during operation.As a result, fish can be captured in the trawl net without escaping, and trawl net fishing can be carried out smoothly, resulting in an increase in the catch.

[0025] The fishing gear of the seventh aspect of the present invention is characterized in that the fishing net of the fourth aspect is a fixed net, and when deployed and set up in water, it is equipped with the underwater operating posture maintaining members in the lower area that forms the bottom of the fence net underwater, and in the side and bottom areas of the pyramidal funnel net.

[0026] According to this seventh aspect of the present invention, when a fixed net is fixedly installed in water, the lower region of the fence net, which is made of PTFE-containing netting yarn with a high specific gravity and forms the bottom in the water, and the side and bottom regions of the pyramidal funnel net, can maintain their standard operating posture, which is an ideal shape, even when external forces such as water currents and tidal flows act on them due to their own weight, preventing fish from escaping from the fence net or funnel net, allowing for smooth fixed net fishing and increased catches.

[0027] The fishing gear of the eighth aspect of the present invention is characterized in that the fishing net of the fourth aspect is a fish cage net, and when deployed and set up in water and in operation, the bottom net area and side net area, which form the bottom underwater, are each equipped with the underwater operating posture maintaining members.

[0028] According to this eighth aspect of the present invention, when the fish cage net is fixedly installed in water, the bottom net area and the side net area, which are formed using PTFE-containing net threads with a high specific gravity, can maintain the ideal standard operating position due to their own weight even when external forces such as water currents and tidal currents act on them, and the shape of the fish cage net can always be maintained in the ideal standard operating position, allowing fish cage net fishing to be carried out smoothly and improving the catch.

[0029] The fishing gear of the ninth aspect of the present invention is characterized in that in each of the first to third aspects, the fishing gear is a longline and is provided with the underwater operating posture maintaining members in the main line area and the float line area when the fishing gear is dropped into the water and sinks, and when it is deployed and set up in the water and in operation.

[0030] According to this ninth aspect of the present invention, when a longline is cast into the water, the main line and float line regions, which are made of PTFE-containing net threads with a high specific gravity, sink before the net thread portions with a low specific gravity. As a result, the entire longline is deployed into the water early while maintaining the standard operating posture, which is the ideal shape during operation. This allows fish to be caught early after being cast, allowing longline fishing to be carried out smoothly and improving catch yields. [Effects of the Invention]

[0031] According to the present invention, it is possible to provide fishing gear that can properly maintain the operating posture of the fishing gear in water with a simple configuration, thereby improving the catch. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a development view of a purse seine net showing one embodiment of a fishing gear according to the present invention. [Figure 2] 2 is a schematic perspective view showing the state in which the purse seine net of FIG. 1 is thrown into water. [Figure 3] FIG. 1 is a schematic perspective view of a trawl net showing another embodiment of a fishing gear according to the present invention. [Figure 4] FIG. 10 is a schematic perspective view of a fixed net showing still another embodiment of the fishing gear according to the present invention. [Figure 5] 1 is a schematic perspective view of a fish cage net showing yet another embodiment of a fishing gear according to the present invention; [Figure 6] FIG. 10 is a schematic perspective view of a longline showing still another embodiment of the fishing gear according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, an embodiment of the present invention will be described.

[0034] <Basic configuration of the present invention> The fishing gear of the present invention is intended for fishing gear that has parts that deform when subjected to external forces such as water currents while in an operating position in water, and is particularly intended for fishing gear that has nets or lines that are easily deformed. Examples of fishing gear that have such characteristics include purse seine nets, trawl nets, fixed nets, fish cage nets, and longlines.

[0035] It is essential that the fishing gear of the present invention is provided with an underwater operating posture maintaining member in at least a part of the fishing gear. This underwater operating posture maintaining member is a member that functions to maintain the operating posture of the fishing gear placed underwater so that it does not deform when subjected to external forces such as water currents, and is provided integrally with the fishing gear. A specific example is to prevent deformation of the fishing gear by its own weight.

[0036] According to the fishing gear of the present invention of this type, the underwater operating posture maintaining member is provided as part of the fishing gear itself, so unlike conventional fishing gear that uses separate sinkers or floaters, the configuration is simple and the operating posture of the fishing gear in the water can be properly maintained, thereby enabling an increase in the catch volume using the fishing gear.

[0037] Furthermore, the fishing gear of the present invention is characterized in that the underwater operating posture maintaining member is provided at a portion of the fishing gear that is deformed from its standard operating posture (the posture of the appropriate shape before deformation) in response to external forces (for example, pushing forces from water currents or tidal flows) when the fishing gear moves relative to the water underwater.

[0038] According to this aspect of the present invention, the underwater operating posture maintaining member is provided in a part that deforms from the standard operating posture of the fishing gear when it receives an external force when moving relative to the water, so that the fishing gear can maintain the appropriate operating posture, which is the standard operating posture, without deforming even when it receives an external force underwater, thereby further improving the catch.

[0039] In addition, the fishing gear of the present invention is characterized in that the underwater operating posture maintaining member is formed from a PTFE-containing material, and the PTFE-containing material has a higher specific gravity than the materials forming other parts of the fishing gear.

[0040] According to this aspect of the present invention, the underwater operating posture maintaining member is formed from a PTFE-containing material which has a higher specific gravity than other materials, and therefore the specific gravity is reliably greater than that of the materials of other parts of the fishing gear. Therefore, the weight (dead weight) of the underwater operating posture maintaining member which has a higher specific gravity can maintain the appropriate operating posture, which is the standard operating posture of the fishing gear, thereby further improving the catch.

[0041] The basic configuration of the present invention described above can be applied to fishing gear based on the design concept, for example, by applying it to necessary parts of a fishing net to actively improve the catch.

[0042] For example, the PTFE-containing material has a high specific gravity of 2.2, whereas nylon, a resin material typically used in fishing gear, has a specific gravity of 1.14, and Tetoron has a specific gravity of 1.38, both of which are low.

[0043] Furthermore, based on these specific gravities, the underwater weights of the PTFE-containing material and the Tetoron material were compared in seawater (specific gravity approximately 1.025) and freshwater (specific gravity approximately 1.0). The underwater weight of the PTFE-containing material of the present invention in seawater was 1.175 (= 2.2 - 1.025) and 1.2 (= 2.2 - 1.0) in freshwater. On the other hand, the underwater weight of the Tetoron material in seawater was 0.355 (= 1.38 - 1.025) and 0.38 (= 1.38 - 1.0) in freshwater. Based on these comparison results, the underwater weight of the PTFE-containing material in seawater was 3.31 times (≒ 1.175 / 0.355) that of the Tetoron material, and 3.16 times (≒ 1.2 / 0.38) in freshwater. For example, if a fishing net made of the conventional Tetoron material is used in a portion that will deform from its standard operating position when subjected to external force, the weight of the PTFE-containing material, which has an underwater weight 3.31 times that of Tetoron in seawater and 3.16 times that of Tetoron in freshwater, will act on the net, preventing deformation of the net portions made of Tetoron material and the net portions made of PTFE-containing material, thereby contributing to an increase in fish catches.

[0044] <Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

[0045] <Purse seine> (Figure 1, Figure 2) 1 and 2 show an embodiment in which the present invention is applied to a purse seine net 1, with FIG. 1 being a development view and FIG. 2 showing the net in operation after being cast into the water.

[0046] A purse seine net 1, which is one type of fishing net that is an embodiment of the fishing gear of the present invention, has a net material 2 that is formed entirely from ordinary Tetron material netting thread, and when the net is cast into the water and sinks, the large-mesh net region 3 located near the top of the lower opening of the net material 2, which forms the bottom underwater, the band net regions 4 of a predetermined longitudinal width that extend from the top to the bottom of the purse seine net 1 at both longitudinal ends of the large-mesh net region 3, and the intermediate horizontal net region 5 above the large-mesh net region 3 are each formed from PTFE-containing netting thread (see the shaded areas in the figure) that serve as members for maintaining the underwater operating posture.

[0047] When this purse seine net 1 is cast into the water, the large mesh area 3, band area 4 and intermediate horizontal area 5, which are made of PTFE-containing net threads with a high specific gravity, sink before the low-specific gravity thread sections, so that the purse seine net 1 is deployed into the water early while maintaining its standard operating position (see Figure 2), which is the ideal shape for operation, allowing fish to be quickly caught in the deployed purse seine net 1, and fish are captured inside the purse seine net 1 without escaping from the bottom, allowing purse seine fishing to be carried out smoothly and improving catches. Furthermore, there is no need to attach sinkers like in conventional purse seines, so the structure of the purse seine net 1 is simplified and there is no need to handle sinkers when casting and hauling the purse seine net 1, greatly improving work efficiency.

[0048] <Trawl net> (Figure 3) FIG. 3 shows an embodiment in which the present invention is applied to a trawl net 11, and FIG. 3 shows the operating state of the net cast into the water.

[0049] A trawl net 11, which is one type of fishing net as an embodiment of the fishing gear of the present invention, comprises a main net section 12 with an opening 13 at the front, and a cod net section 14 connected to the rear end of the main net section 12. In this embodiment, when the trawl net 11 is being towed underwater, a bottom area 15 (see the shaded area in Figure 3) which becomes the bottom of the main net section 12 in the water is formed from PTFE-containing net yarn which serves as a member for maintaining the underwater operating posture.

[0050] When this trawl net 11 is cast into the water, the bottom region 15, which is made of PTFE-containing net threads with a high specific gravity and forms the bottom in the water, sinks before the net threads with a low specific gravity, particularly the top portion of the main net section 12. As a result, the net mouth section 13 of the trawl net 11 is opened sufficiently in the vertical direction, the main net section 12 does not become tangled, and the overall shape of the trawl net 11 is deployed into the water early while maintaining the standard operating posture, which is the ideal shape during operation.As a result, fish can be captured within the trawl net 11 without escaping, and trawl fishing can be carried out smoothly, resulting in an increase in the catch.

[0051] <Fixed net> (Figure 4) FIG. 4 shows an embodiment in which the present invention is applied to a fixed net 21.

[0052] A fixed net 21, which is a type of fishing net as an embodiment of the fishing gear of the present invention, is configured to guide fish to a swimming area 23 using a fence net 22 erected underwater, guide them from the swimming area 23 to a middle pool 25 through a pyramidal funnel net 24 which serves as a middle pool return, and guide the fish from the middle pool 25 to a pool 27 through a pyramidal funnel net 26 which serves as a middle pool return, where they are caught.

[0053] In the fixed net 21 of this embodiment, when deployed and operating underwater, the lower region 22a, which forms the bottom of the fence net 22 underwater, and the side regions 24a, 26a and bottom regions 24b, 26b (see the cross line portion in Figure 4) of the pyramidal funnel nets 24, 26 are formed of PTFE-containing mesh threads as underwater operating posture maintaining members.

[0054] When this fixed net 21 is fixedly installed in the water, the lower region 22a, which forms the bottom underwater of the fence net 22, which is made of PTFE-containing net thread with a high specific gravity, and the side regions 24a, 26a and bottom regions 24b, 26b of the pyramidal funnel nets 24, 26, can maintain the fence net 22 and funnel nets 24, 26 in their ideal standard operating position with their own weight, even when external forces such as water currents and tidal currents act on them, preventing fish from escaping from the fence net 22 and funnel nets 24, 26 and allowing for smooth fixed net fishing and increased catches.

[0055] Furthermore, in the fixed net 21 that is fixedly installed underwater, the PTFE-containing net threads used as underwater operating posture maintaining members have non-adhesive and low friction properties, which makes it difficult for algae and other organisms to adhere, and even if they do adhere, they are easily removed by water currents and tidal currents. This eliminates the need to apply and reapply an anti-algae agent to the PTFE-containing net threads, and makes it possible to suppress the increase in force exerted by water currents and tidal currents.

[0056] <Cage net> (Figure 5) FIG. 5 shows an embodiment in which the present invention is applied to a fish cage net 31.

[0057] The fish cage net 31, which is a type of fishing net that is an embodiment of the fishing gear of the present invention, is formed by fixing a cylindrical side net portion 33 so that it hangs down from a circular floating portion 32 that is placed on the water surface, and connecting a circular bottom net portion 34 to the side net portion 33.

[0058] In the fish cage net 31 of this embodiment, when deployed and installed underwater, the bottom mesh portion 34, which forms the bottom underwater, and the side mesh portion 33 are entirely formed of PTFE-containing mesh yarn as underwater operating posture maintaining members (see the cross line portion in Figure 5).

[0059] When this fish preserve net 31 is fixedly installed in the water, the bottom net section 34 and the side net section 33, which are made of PTFE-containing net threads with a high specific gravity, can maintain their ideal standard operating position due to their own weight even when external forces such as water currents and tidal currents act on them, and the shape of the fish preserve net 31 can always be maintained in the ideal standard operating position, allowing fish preserve fishing to be carried out smoothly and increasing the catch.

[0060] More specifically, the net 31 of this embodiment can always maintain its shape in an ideal standard operating position, thereby achieving the following excellent effects. First, deformation of the net shape due to external forces such as water currents and tides can be reliably suppressed, allowing the capacity of the net 31 to be maintained large and preventing overcrowding and death of farmed fish that would otherwise occur due to reduced capacity. Second, even when the net 31 is towed away to avoid red tides, the net 31 is less likely to deform, allowing for a faster towing speed than before, enabling the farmed fish to escape quickly while maintaining their health, thereby increasing the catch. Third, the net 31 is less likely to deform, even in high waves or violent ocean storms, minimizing rocking of the net 31 and extending the service life of the entire facility, including the net 31. Fourth, the non-adhesive and low-friction properties of the PTFE-containing netting threads used as underwater operating posture maintaining members make it difficult for algae and other organisms to adhere, and even if they do adhere, they are easily removed by water currents and tides. This eliminates the need to apply and reapply an anti-algae agent to the PTFE-containing netting threads, thereby preserving the aquatic environment, reducing maintenance costs for the fish cage nets 31, and reducing the impact of the anti-algae agent on farmed fish, allowing for the provision of healthy, high-quality farmed fish.

[0061] <Longline> (Figure 6) FIG. 6 shows an embodiment in which the present invention is applied to a longline 41 .

[0062] A longline 41 as an embodiment of the fishing gear of the present invention is set up by suspending a main line 44 from a float 43 floating on the water surface with a float line 42 set midway in the longitudinal direction, and dropping it into the water, and is configured so that fish can be caught with numerous hooks 45 attached to the main line 44.

[0063] In the longline 41 of this embodiment, the float line 42 and the main line 44 are entirely formed of PTFE-containing netting yarn as members for maintaining the operating position in water.

[0064] When this longline 41 is cast into the water, the float line 42 and main line 44, made of PTFE-containing netting thread with a high specific gravity, maintain their ideal standard operating posture even when subjected to external forces such as water currents and tidal currents due to their own weight. This shortens the time it takes for the longline 41 to reach the desired depth after being cast, preventing missed fishing opportunities. Furthermore, the depth of the entire fishing gear, including the very long main line 44, from the water surface can be maintained close to the target depth corresponding to the target fish species, preventing the bycatch of untargeted fish species as in the past and allowing for efficient capture of only the target fish species. Furthermore, the configuration of the longline 41 can be appropriately changed to match the target fish species, increasing the selectivity of fishing gear and ultimately improving catch yields.

[0065] The present invention is not limited to the above-described embodiment, and can be modified as necessary. [Explanation of symbols]

[0066] 1 Purse seine 2. Netting material 3 Large mesh area 4 Obi area 11 Trawl Net 12 Body mesh section 15 Bottom area 21 Fixed net 22 Fence 24, 26 funnel net 31 Fish Cage Net 33 Side mesh part 34 Bottom mesh section 41 Longline 42 Floating rope 44 Main rope

Claims

1. In a fishing gear having an underwater operating posture maintaining member at a part of the fishing gear on which a float is provided when operating underwater, The fishing gear is a fishing net, The underwater operating posture maintaining member is formed of a PTFE-containing netting yarn, The PTFE-containing net yarn is made of net yarn having a higher specific gravity than net yarns forming other parts of the fishing net, The fishing net is a purse seine net, This fishing gear is characterized in that, when the net is cast into the water and sinks, the underwater operating posture maintaining members are provided in a large mesh area near the top of the lower mouth of the net, which becomes the bottom in the water below the float, and in a band net area extending a predetermined width in the longitudinal direction from the top to the bottom of the net at both longitudinal ends of the large mesh area.

2. In a fishing gear having an underwater operating posture maintaining member at a part of the fishing gear on which a float is provided when operating underwater, The fishing gear is a fishing net, The underwater operating attitude maintaining member is formed of a PTFE-containing netting yarn, The PTFE-containing net yarn is made of net yarn having a higher specific gravity than net yarns forming other parts of the fishing net, the fishing net is a trawl net, This fishing gear is characterized in that the underwater operating posture maintaining member is provided in a part of the bottom area that becomes the bottom below the float when the net is being towed underwater, and in an area that includes the lower edge of the net mouth that forms the front opening.

3. In a fishing gear having an underwater operating posture maintaining member at a part of the fishing gear on which a float is provided when operating underwater, The fishing gear is a fishing net, The underwater operating posture maintaining member is formed of a PTFE-containing netting yarn, The PTFE-containing net yarn is made of net yarn having a higher specific gravity than net yarns forming other parts of the fishing net, The fishing net is a fixed net, This fishing gear is characterized in that, when deployed and installed underwater, the underwater operating posture maintaining members are provided in a lower region that forms the bottom of the fence net below the float in the water, as well as in the side regions of the pyramidal funnel net and the bottom region extending between the side regions of the funnel net.

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