Trawl fishing gear operating device
The trawl fishing gear operating device uses warp tension detection and state determination to maintain the gear's position, addressing environmental damage by ensuring accurate underwater positioning and efficient fishing.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- NICHIMO COMPANY LIMITED
- Filing Date
- 2022-02-09
- Publication Date
- 2026-05-25
AI Technical Summary
Trawl fishing methods cause environmental damage to fishing grounds by towing otter boards and trawl nets along the bottom, leading to deterioration of breeding and spawning grounds for bottom-dwelling fish.
A trawl fishing gear operating device that uses warp tension detection and state determination means to maintain the proper underwater position of the gear, automatically adjusting it to avoid damaging the seabed through model simulation and real-time data comparison.
Enables trawl fishing without harming the fishing grounds by accurately determining and maintaining the trawl gear's position, ensuring efficient fishing operations.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to an operating device for trawl fishing gear, and more particularly, to an operating device for trawl fishing gear suitable for towing trawl fishing gear for fishing without damaging the fishing ground.
Background Art
[0002] Generally, trawl fishing gear is widely used as one type of fishing gear for catching fish. Usually, warps wound around a pair of trawl winches on the left and right are drawn out from a fishing boat, and a pair of otter boards are interposed at the tips of the warps to connect the left and right openings of the trawl net and are formed to be towed. As the fishing boat sails, the otter boards expand the mouth of the trawl net to catch the catch inside the trawl net.
[0003] In order to improve the fishing efficiency in such trawl fishing methods, various devices have been proposed. For example, in Patent Document 1, it has been proposed to automatically control the trawl fishing gear to be adjusted to an appropriate position with respect to the discovered fish school to improve the fishing efficiency.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] In today's fishing industry, it is desired to improve fishing efficiency while securing fishery resources and preventing damage to the fishing ground.
[0006] Similar requirements exist in trawl fishing, but conventionally, when catching bottom-dwelling fish (including shrimp and crabs), otter boards and trawl nets are towed along the bottom of the fishing grounds, which causes environmental damage to the bottom of the fishing grounds, which serve as breeding and spawning grounds for the catch, including bottom-dwelling fish. This has led to problems such as the deterioration of fishing grounds and a reduction in fishery resources.
[0007] The present invention has been made in view of these points, and aims to provide a trawl fishing gear operating device that can maintain the proper position of the trawl fishing gear underwater by constantly acquiring the underwater position of the trawl fishing gear, comparing it with data already collected, and automatically controlling the trawl fishing gear to adjust it to the appropriate position, thereby enabling the trawl fishing gear to be towed and used for fishing without damaging the fishing grounds. [Means for solving the problem]
[0008] To achieve the aforementioned objectives, the inventors of the present invention diligently conducted research and used a model of trawl fishing gear to measure and obtain various data related to the underwater position of the trawl fishing gear through model simulation, thereby improving the trawl fishing method. As a result, they confirmed that the data showing the off-bottom state of the trawl fishing gear obtained by model simulation and numerical simulation, and the data showing the off-bottom state of the trawl fishing gear obtained by actual operation of the trawl fishing gear, all exhibit the same characteristics, thus completing the present invention. In this invention, model simulation and numerical simulation are collectively referred to as pre-simulation.
[0009] Specifically, the tension acting on the warp to which the trawl fishing gear is attached showed identical characteristics in three cases: a state where both the trawl fishing gear and the gear are off the seabed, a state where only the trawl net is on the seabed, and a state where both the trawl net and the otter board are on the seabed. In each of these cases, the data showing the tension obtained from pre-simulation and the data showing the tension obtained from actual operation of the trawl fishing gear showed the same characteristics.
[0010] A trawl fishing gear operating device according to a first aspect of the present invention is a trawl fishing gear operating device that operates a trawl fishing gear including a pair of warps deployed from a workboat, otter boards attached to the downstream ends of each warp, and a trawl net attached between the two otter boards, and is characterized by comprising: a warp tension detection means for detecting the tension state of the warps due to actual operation; and a detachment / detachment state determination means for determining the detachment / detachment state of the trawl net and the otter boards, which corresponds to the detachment / detachment state of the trawl fishing gear, based on the tension state of the warps detected by the warp tension detection means.
[0011] According to this first aspect of the present invention, the detachment / settlement state determination means accurately determines the detachment / settlement state of the trawl fishing gear based on the warp tension state in actual operation detected by the warp tension detection means, thereby enabling proper trawl fishing to be carried out.
[0012] Furthermore, in the first embodiment, the operating device for a trawl fishing gear according to the second aspect of the present invention is characterized in that the detachment / settling state determination means is configured to determine which of three detachment / settling states corresponds to the warp tension state detected by the warp tension detection means, which consists of a double detachment / settling state in which the trawl fishing gear is detached from the seabed, a trawl net anchored state in which only the trawl net is anchored to the seabed, and a double anchored state in which both the trawl net and the otter board are anchored to the seabed.
[0013] According to this second aspect of the present invention, based on the warp tension state in actual operation detected by the warp tension detection means, the detachment / settling state determination means accurately determines which of the three detachment / settling states corresponds to: a double detachment state where the entire trawl fishing gear is detached from the seabed; a trawl net anchored state where only the trawl net is anchored to the seabed; and a double anchored state where both the trawl net and the otter board are anchored to the seabed, thereby enabling proper trawl fishing.
[0014] Furthermore, in the third embodiment of the present invention, the trawl fishing gear operating device is characterized in that the bottom-setting state determination means is configured to determine which bottom-setting state corresponds to by comparing bottom-setting state stock data, which consists of the tension state of the warp collected in advance for the trawl fishing gear, with the tension state of the warp during actual operation detected by the warp tension detection means.
[0015] According to this third aspect of the present invention, the tension state of the warp during actual operation detected by the warp tension detection means is compared with stock data of the detachment / settling state by the detachment / settling state determination means. This allows for a more accurate determination of which of the three detachment / settling states—a double detachment state where the entire trawl gear is detached from the seabed, a trawl net anchored state where only the trawl net is anchored to the seabed, and a double anchored state where both the trawl net and the otter board are anchored to the seabed—corresponds to the seabed, enabling the execution of appropriate trawl fishing.
[0016] Furthermore, in the third embodiment, the operating device for a trawl fishing gear according to the fourth aspect of the present invention is characterized in that the stock data of the detachment and settling state is updated by sequentially adding the actual operating values of the detachment and settling state, which are measured by the actual operation of the trawl fishing gear and determined by the detachment and settling state determination means, to the initial simulated detachment and settling state values, which are measured by a prior simulation and classified into the three types of detachment and settling states.
[0017] According to this fourth aspect of the present invention, the stock data of the sinking and unsinking state is updated by sequentially adding the actual operating values of the sinking and unsinking state, which are measured during the actual operation of the trawl fishing gear and determined by the sinking and unsinking state determination means, to the initial simulated sinking and unsinking state values, which are classified into three types of sinking and unsinking states measured by prior simulation. As a result, the accuracy of the stock data of the sinking and unsinking state becomes more faithful to the actual operation as the actual operation is repeated, and the accuracy can be improved.
[0018] Furthermore, the trawl fishing gear operating device according to the fifth aspect of the present invention is characterized in that, in any of the first to fourth aspects, it includes an actual operation execution means for adjusting the detachment / settlement state of the trawl fishing gear by actual operation or adjusting it to one of the three types of detachment / settlement states and performing actual operation, and an operating state instruction means for instructing the actual operation execution means to maintain or change the detachment / settlement state by actual operation determined by the detachment / settlement state determination means.
[0019] According to this third aspect of the present invention, the operating state instruction means instructs the actual operation execution means to maintain or change the detachment / settling state determined by the detachment / settling state determination means, thereby maintaining the detachment / settling state of the trawl fishing gear in an appropriate state, and enabling the trawl fishing gear to be towed and fish caught without damaging the fishing grounds.
[0020] The operating device for a trawl fishing gear according to the sixth aspect of the present invention, in the fifth aspect, comprises a central operating control means that coordinately operates the warp tension detection means, the bottoming / detachment state determination means, the actual operation execution means, and the operating state instruction means, wherein the central operating control means is configured to process feedback of the operations of the warp tension detection means, the bottoming / detachment state determination means, the actual operation execution means, and the operating state instruction means to guide the operating state of the trawl fishing gear to an appropriate bottoming / detachment state, and is configured to manage, learn, and update the operating history including the bottoming / detachment state stock data.
[0021] According to this sixth aspect of the present invention, the central operation control means can process feedback of the operations of the bottoming / detachment state determination means, the actual operation execution means, and the operation state instruction means to guide the operation state of the trawl fishing gear to an appropriate bottoming / detachment state, and can further manage, learn, and update the operation history including the bottoming / detachment state stock data, and can tow the trawl fishing gear and catch fish without damaging the fishing grounds.
[0022] Further, in the operation device of the trawl fishing gear according to the seventh aspect of the present invention, in the fifth or sixth aspect, the actual operation execution means is formed by at least one of a warp winch that winds up and pays out the warp and a ship speed adjustment means that adjusts the ship speed of the working ship.
[0023] According to the seventh aspect of the present invention, one of the actual operation execution means that has received an instruction of the operation state to be aimed at from the operation state instruction means adjusts the winding-up state of the warp to match the off-bottom state of the trawl fishing gear according to the instruction content, and the other ship speed adjustment means can adjust the ship speed of the working ship to match the off-bottom state of the trawl fishing gear according to the instruction content, and the trawl fishing gear can be towed and fished without damaging the fishing ground.
Effect of the Invention
[0024] According to the present invention, it is possible to always acquire the underwater position of the trawl fishing gear, compare it with the data already collected, and automatically control it to adjust the trawl fishing gear to the appropriate position, so that the underwater position of the trawl fishing gear can be properly maintained, and an operation device for a trawl fishing gear that can tow and fish the trawl fishing gear without damaging the fishing ground can be provided.
Brief Description of the Drawings
[0025] [Figure 1] It is a perspective view showing the state of a model simulation of an operation device for a trawl fishing gear according to the present invention. (a) is a perspective view showing a both-bottomed state where both the trawl net and the otter board are on the seabed, (b is a perspective view showing a trawl net bottomed state where only the trawl net is on the seabed, and (c) is a perspective view showing a both-off-bottom state where the entire trawl fishing gear is off the seabed. [Figure 2]Figure 1 shows characteristic diagrams of time-series warp tension measured by a model simulation. The left half of the figure shows a characteristic diagram of time-series warp tension consisting of measured raw data. The right half of the figure shows a characteristic diagram of the time-series warp tension of the raw data shown in the left half together with the processed data obtained by filtering that raw data. The left and right characteristic diagrams in the upper part of the figure show a state where both the trawl net and the otter board are attached to the seabed. The left and right characteristic diagrams in the middle part of the figure show a state where only the trawl net is attached to the seabed. The left and right characteristic diagrams in the lower part of the figure show a state where both the trawl gear and the otter board are off the seabed. [Figure 3] This diagram illustrates the principle of determining a feature vector from the time-series warp tension characteristics shown in Figure 2, and then deriving the standard deviation, interquartile range, peak frequency, and autocorrelation coefficient from that feature vector. [Figure 4] (a) is a characteristic diagram showing the relationship between the standard deviation and the probability density obtained by the principle shown in Figure 3, (b) is a characteristic diagram showing the relationship between the interquartile range and the probability density obtained by the principle shown in Figure 3, (c) is a characteristic diagram showing the relationship between the peak frequency and the probability density obtained by the principle shown in Figure 3, and (d) is a characteristic diagram showing the relationship between the autocorrelation coefficient and the probability density obtained by the principle shown in Figure 3. [Figure 5] Block diagram showing an embodiment of the operating device for trawl fishing gear according to the present invention. [Modes for carrying out the invention]
[0026] Embodiments of the present invention will be described below.
[0027] <Preliminary simulation of the present invention> Figure 1 shows an overview of the simulation apparatus 1 used to perform a model simulation as a preliminary simulation of the present invention.
[0028] In the simulation device 1, a towing tank manufactured by Nichimo Co., Ltd. (100m in length, 5m in width, and 1.5m in depth) was used as tank 2 for conducting towing tests of trawl fishing gear.
[0029] A towing device (corresponding to a workboat used in actual operations), not shown in the diagram, is installed in this tank 2 so as to be movable along the length of the tank 2 (left-right direction in Figure 1). A model trawl fishing gear 3 is deployed downstream from the towing device (left direction in Figure 1).
[0030] To explain further, a pair of warps 4a and 4b are positioned at the uppermost part of the trawl fishing gear 3 and are deployed from the towing device. Otter boards 5a and 5b are attached to the downstream ends of each warp 4a and 4b, respectively, and a trawl net 7 is attached between the downstream ends of the net pennants 6a and 6b deployed from the two otter boards 5a and 5b. The trawl net 7 in this model is made to a scale of 1 / 18 of, for example, an actual six-bladed bottom trawl net (total length 46.5m, head rope length 37.8m). Multiple floats 8 are attached to the head rope, and a rubber bobbin and chain 9 with sinking force are attached to the ground rope. The otter boards 5a and 5b should be models of high-lift otter boards that can be used in both the mid- and bottom layers. Furthermore, small tension meters 10a and 10b are installed between the two warps 4a and 4b to measure the tension acting on each warp 4a and 4b during towing. For the bottom sediment 11 of the tank 2, it is preferable to select and lay sandy areas, pebble areas, boulder areas, and rocky areas. The particle sizes of the sandy areas, pebble areas, boulder areas, and rocky areas should be adjusted by applying the Tanouchi model similarity law.
[0031] Next, we will explain the overview of the collection of initial value data for simulated landing and detachment states using simulation device 1.
[0032] The inventors used the simulation device 1 shown in Figure 1 to operate the towing device and tow the trawl fishing gear 3 in the water tank 2, measuring and analyzing the tension acting on each of the warp 4a and 4b using the tension meters 10a and 10b attached to the pair of warp 4a and 4b.
[0033] in particular, As shown in Figure 1(a), both the trawl net 7 and both otter boards 5a and 5b are in a state where they are both attached to the bottom sediment 11 corresponding to the seabed (hereinafter referred to as the "both attached state"), As shown in Figure 1(b), there is a trawl net bottom-attached state in which only the trawl net 7 is attached to the bottom sediment 11 corresponding to the seabed (hereinafter referred to as the "trawl net bottom-attached state"), As shown in Figure 1(c), the trawl net 7 and both otter boards 5a and 5b are both detached from the seabed (hereinafter referred to as "both detached from the seabed"). The towing device was moved to that position, and the trawl fishing gear 3 was towed. The tension acting on each warp 4a and 4b was measured and analyzed using the tension meters 10a and 10b attached to the pair of warps 4a and 4b.
[0034] The left half of Figure 2 shows the raw time-series warp tension data over a 10-second period, while the right half of the figure shows the time-series warp tension data over the 10-second period shown in the left half, along with the processed data obtained by filtering that raw data. The left and right characteristic diagrams in the upper part of Figure 2 show the state where both the trawl net 7 and the otter boards 5a and 5b are attached to the seabed, the left and right characteristic diagrams in the middle part of the figure show the state where only the trawl net 7 is attached to the seabed, and the left and right characteristic diagrams in the lower part of the figure show the state where both are off the seabed, with the entire trawl fishing gear 3 separated from the seabed.
[0035] As shown in Figure 2, the time-series warp tension characteristics obtained from the simulation were found to have different patterns in three different states: both bottom-dwelling, trawl net bottom-dwelling, and both off-bottom.
[0036] In this invention, multiple simulation measurements were performed for three states: both surfaces touching the bottom, the trawl net touching the bottom, and both surfaces detached from the bottom. A time-series warp tension group representing each state was formed and stored as initial value data for the simulated detached / settled state.
[0037] Next, we will explain how to interpret the data showing tension obtained from the actual operation of trawl fishing gear.
[0038] In this invention, the initial simulation data for the bottom-setting and detachment states, which shows three types of tension corresponding to the state where both trawls are set to the bottom, the state where the trawl net is set to the bottom, and the state where both trawls are detached from the bottom, obtained by prior simulation, and the data showing three types of tension obtained by actual operation of the trawl fishing gear, show the same characteristics, and the central operation control means makes a decision using, for example, AI.
[0039] The decision-making method by this central operation control means will be explained with reference to Figures 3 and 4.
[0040] For the unknown time-series warp tension shown at the top of the left half of Figure 3, a feature vector is extracted. By analyzing the features contained in this feature vector using AI according to the neural network procedure, it is determined whether the unknown type belongs to the state of both sides being at the bottom, the state of the trawl net being at the bottom, or the state of both sides being off the bottom.
[0041] The features contained in the feature vector can be obtained by applying the following methods: as shown in the right half of Figure 3, low-pass filtering is performed on the time-series warp tension data to find the standard deviation, high-pass filtering is performed to find the interquartile range, the power spectrum is calculated using Fourier transform for the frequency domain to find the peak frequency, and the autocorrelation function for the periodic delay time is calculated and applied.
[0042] When these standard deviations, interquartile ranges, peak frequencies, and autocorrelation functions are statistically processed using a large number of cases obtained in the simulation, the relationship with probability density characteristics becomes clearly classified and distributed among three states: both bottom-dwelling, trawl net bottom-dwelling, and both off-bottoming, as shown in Figures 4(a) to (d). Therefore, it is desirable to run a large number of cases to clarify the differences between the three states when creating the initial data for the simulated off-bottoming states. Furthermore, it is desirable to learn and update the simulation by adding data showing the three types of tension obtained from the actual operation of trawl fishing gear to the initial data for the simulated off-bottoming states to form a stock data for the off-bottoming states.
[0043] Next, the operating device for the trawl fishing gear of the present invention will be explained with reference to Figure 5.
[0044] The trawl fishing gear operating device 21 of this embodiment (hereinafter referred to as "operating device 21") is preferably installed in the wheelhouse of a workboat (not shown). A pair of warp winches 22a and 22b are installed on the stern side of the workboat, and each of them uses a pair of warps 23a and 23b to pay out and hoist up the trawl fishing gear 24. Otter boards 25a and 25b are attached to the downstream ends of each of the warps 23a and 23b, and a trawl net 27 is attached between the downstream ends of the net pennants 26a and 26b that are paid out from both otter boards 25a and 25b. Each of the warp winches 22a and 22b is fitted with tension meters 28a and 28b, which serve as warp tension detection means for measuring the tension acting on each of the warps 23a and 23b. As a means for performing actual operation while adjusting the state of the trawl fishing gear 24's contact with the seabed, the warp winches 22a and 22b and an engine 29 for adjusting the speed of the workboat are employed.
[0045] The operating device 21 is equipped with a central operation control means 31 as the overall control system. This central operation control means 31 includes a landing / unloading state determination means 32, an operation state instruction means 33, a central processing unit 34 such as an AI, a memory 35, and the like.
[0046] Specifically, the tension state of the warp detected by each tension meter 28a and 28b is output to a bottom-dwelling state determination means 32 provided in the central operation control means 31. This bottom-dwelling state determination means 32 is configured to analyze the tension state of the warp detected by the tension meter 28a and 28b and determine which of three bottom-dwelling states the tension state of the warp corresponds to: a double-off-the-sea state where the trawl fishing gear 24 is separated from the seabed; a trawl net-down state where only the trawl net 27 is down on the seabed; and a double-off-the-sea state where both the trawl net 27 and the otter boards 25a and 25b are down on the seabed. Furthermore, the bottoming-determination means 32 is configured to determine which bottoming-determination state corresponds to by comparing the bottoming-determination-state stock data, which represents the bottoming-determination state consisting of the tension state of the warp collected in advance for the trawl fishing gear 24, with the tension state of the warp during actual operation detected by the tension meters 28a and 28b, which are warp tension detection means. In addition, the bottoming-determination-state stock data stored in memory 35 is updated by sequentially adding the actual operating values of the bottoming-determination state, which are measured during the actual operation of the trawl fishing gear 24 and determined by the bottoming-determination means 32, to the initial simulation bottoming-determination state values, which are classified into three types of bottoming-determination states measured by a prior simulation as initial values.
[0047] The operating state instruction means 33 is configured to instruct one or both of the warp winches 22a and 22b, which are the actual operating execution means, and the engine 29 of the workboat, to maintain or change the docking / undocking state determined by the docking / undocking state determination means 32 during actual operation.
[0048] The central operation control means 31 is configured to coordinate the operation of the warp tension detection means, which are tension meters 28a and 28b, the bottoming / detachment state determination means 32, the actual operation execution means, which are warp winches 22a and 22b, the engine 29 that adjusts the speed of the workboat, and the operation state indication means 33. Furthermore, the central operation control means 31 is configured to provide feedback processing of the operation of the warp tension detection means, which are tension meters 28a and 28b, the bottoming / detachment state determination means 32, the actual operation execution means, which are warp winches 22a and 22b, the engine 29 that adjusts the speed of the workboat, and the operation state indication means 33, in order to guide the operation state of the trawl fishing gear 24 to an appropriate bottoming / detachment state, and is also configured to manage, learn, and update the operation history, including bottoming / detachment state stock data, in the memory 35.
[0049] Next, the operation of the control device 1 will be explained.
[0050] The trawl fishing operation is initiated, the trawl fishing gear 24 is deployed into the water, and tension measurements are started using tension meters 28a and 28b.
[0051] When the warps 23a and 23b are extended to the extent that the trawl net 27 touches the seabed, the tension meters 28a and 28b output raw data shown in the right half of Figure 2. The off-sea state determination means 32 and the central calculation unit 33 of the central operation control means 31 determine the time-series warp tension shown in the left half of Figure 2, then calculate the feature vector shown at the top of the left half of Figure 3, and subsequently analyze the feature vector according to the neural network procedure to determine whether the measured time-series warp tension belongs to the state where both are touching the seabed, the state where the trawl net is touching the seabed, or the state where both are off the seabed. Specifically, the off-sea state determination means 32 determines which off-sea state it corresponds to by comparing the off-sea state stock data, which consists of the tension state of the warp collected in advance for the trawl fishing gear 24, with the tension state of the warp during actual operation detected by the tension meters 28a and 28b, which are the warp tension detection means. Furthermore, the stock data of the landing and detachment states stored in memory 35 is updated by sequentially adding the actual operating values of the landing and detachment states, which are measured by the actual operation of the trawl fishing gear 24 and determined by the landing and detachment state determination means 32, to the initial simulated landing and detachment state values, which are classified into three types of landing and detachment states measured by a prior simulation as initial values.
[0052] Next, the operating state instruction means 33 instructs one or both of the warp winches 22a and 22b, which are the actual operating execution means, and the engine 29 of the workboat, to maintain or change the docking / undocking state determined by the docking / undocking state determination means 32 during actual operation.
[0053] One warp winch 22a, 22b performs the functions of extending, raising, or maintaining the warp 23a, 23b, while the other workboat's engine 29 performs the functions of increasing, decreasing, or maintaining the ship's speed.
[0054] When the ship speed is constant, the trawl can be divided into three states depending on the length of the warp 23a and 23b that are extended: both are at the bottom, the trawl net is at the bottom, and both are off the bottom. Therefore, when lifting the trawl fishing gear 24 off the bottom, it is best to reel in the warp 23a and 23b in a way that shortens the length of the warp that are extended.
[0055] When the extension lengths of the warp 23a and 23b are constant, the boat can be divided into three states depending on the speed: both are on the bottom, the trawl net is on the bottom, and both are off the bottom. Therefore, when lifting the trawl fishing gear 24 off the bottom, it is advisable to increase the speed of the boat.
[0056] Through the above operations, the trawl fishing gear 24 is moved to the desired offshore state, and trawl fishing is performed.
[0057] Furthermore, it is preferable to repeatedly perform data processing and feedback of the central operation control means 31, etc., associated with the above operations in real time.
[0058] As a result, the stock data of sinking and unsinking states stored in memory 35 is updated by sequentially adding the actual operating values of sinking and unsinking states, which are measured during the actual operation of the trawl fishing gear 24 and determined by the sinking and unsinking state determination means 32, to the initial simulated sinking and unsinking state values, which are classified into three types of sinking and unsinking states measured by a prior simulation as initial values. This results in a larger dataset and improved reliability.
[0059] As described above, according to this embodiment, the underwater position of the trawl fishing gear is constantly acquired and compared with already collected data, and the trawl fishing gear is automatically controlled to adjust to the appropriate position, thereby maintaining the underwater position of the trawl fishing gear appropriately and enabling fishing by towing the trawl fishing gear without damaging the fishing grounds.
[0060] The present invention is not limited to the embodiments described above and can be modified as needed. [Explanation of Symbols]
[0061] 1. Simulation device 3 Trawl fishing gear 4a, 4b Warp 5a, 5b Otter board 7 Trawl net 10a, 10b Tension meter 21 Operating device 22a, 22b Troll winches 23a, 23b Warp 24 Trawl Fishing Gear 25a, 25b Otter board 27 Trawl net 28a, 28b Tension meter 29 Engine 31 Central Operating Control Means 32 Means for determining whether the vessel is landing or detached from the bottom 33 Operating status indicator means 34 Central processing unit 35 memory
Claims
1. A trawl fishing gear operating device for operating a trawl fishing gear including a pair of warps deployed from a workboat, otter boards attached to the downstream end of each warp, and a trawl net attached between the two otter boards, A warp tension detection means for detecting the tension state of the warp during actual operation, The system includes a means for determining the state of attachment / detachment of the trawl net and the otter board, which corresponds to the state of attachment / detachment of the trawl fishing gear, based on the tension state of the warp detected by the warp tension detection means. A device for operating trawl fishing gear, characterized by the following features.
2. The above-mentioned detachment / sinking state determination means is configured to determine which of the three detachment / sinking states—a state in which both the trawl fishing gear and the otter board are detached from the seabed, a state in which only the trawl net is touching the seabed, and a state in which both the trawl net and the otter board are touching the seabed—corresponds to the warp tension detection means. The operating device for trawl fishing gear according to feature 1.
3. The bottom-setting determination means is configured to determine which bottom-setting state corresponds to the trawl gear by comparing stock data of bottom-setting states, which consists of the tension state of the warp collected in advance for the trawl gear, with the tension state of the warp during actual operation detected by the warp tension detection means. The operating device for trawl fishing gear according to feature 2.
4. The trawl fishing gear operating device according to claim 3, characterized in that the stock data of the settling and unsettling states is updated by sequentially adding the simulated initial settling and unsettling state values, which are classified into the three settling and unsettling states measured by a prior simulation as initial values, to the actual settling and unsettling state values measured by the actual operation of the trawl fishing gear and determined by the settling and unsettling state determination means.
5. Actual operation execution means for adjusting the bottom-setting state of the trawl fishing gear through actual operation or adjusting it to one of the three types of bottom-setting states and then performing actual operation, An operating state instructing means to instruct the actual operation execution means to maintain or change the landing / detachment state determined by the landing / detachment state determination means during actual operation. A trawl fishing gear operating device according to any one of claims 3 or 4, characterized by having the following features.
6. The system includes a central operation control means that coordinates the operation of the warp tension detection means, the bottoming / detachment state determination means, the actual operation execution means, and the operation state instruction means. The trawl fishing gear operating device according to claim 5, wherein the central operation control means is configured to process feedback of the operations of the warp tension detection means, the bottoming / detachment state determination means, the actual operation execution means, and the operation state instruction means to guide the operation state of the trawl fishing gear to an appropriate bottoming / detachment state, and is configured to manage, learn, and update the operation history including the bottoming / detachment state stock data.
7. The trawl fishing gear operating device according to claim 5 or 6, characterized in that the actual operation means is formed by at least one of a warp winch for winding up and unwinding the warp and a speed adjustment means for adjusting the speed of the workboat.