Nondestructive fishing device for penaeus japonicus parents

Abstract

The invention discloses a penaeus japonicus parent lossless fishing device, and relates to the technical field of aquaculture and fishing equipment. The device mainly comprises a fishing net body and a storage box body, the storage box body is internally provided with a buffer suspension module, the buffer suspension module is made of non-Newtonian fluid gel formed by compounding shear thickening fluid and a normal-temperature phase-change material, soft support can be provided when shrimp bodies are embedded in the buffer suspension module, and the buffer suspension module is instantly converted into a rigid state when encountering external impact; and reversible intelligent protection is realized. In addition, the device is integrated with a multi-mode induction and protection system, through a dormancy inducer slow release unit, an acoustic induction assembly, a flexible pressure air bag and a light source induction module, the shrimps are effectively induced to calm, and stress is reduced.

Description

Technical Field

[0001] This invention belongs to the field of aquaculture and fishing equipment technology, specifically relating to a non-destructive harvesting device for Japanese shrimp broodstock. Background Technology

[0002] The harvesting of broodstock of Japanese shrimp is a crucial upstream link in its artificial breeding industry chain. Currently, harvesting operations mainly rely on traditional trawls and gillnets, which have significant drawbacks in the lifting, transportation, and temporary holding processes. First, shrimp are easily impacted by turbulent currents and rubbed against the net, affecting their physiological functions and reproductive potential. Second, when encountering sudden external impacts, traditional rigid or flexible containers lack intelligent buffering mechanisms and cannot effectively absorb energy, causing shrimp to roll and collide within the container, resulting in secondary physical damage. More critically, drastic environmental changes (such as temperature, pressure, and light) and human interference throughout the process can trigger strong stress responses in shrimp, leading to panic, metabolic disorders, and decreased immunity, ultimately significantly reducing broodstock survival rates and utilization efficiency. Furthermore, existing equipment is functionally limited, lacking active induction designs based on shrimp biological habits, and struggles to maintain a suitable and stable water quality environment during the temporary holding stage.

[0003] Therefore, there is an urgent need in this field for a comprehensive fishing device that can achieve efficient trapping, intelligent buffering, multi-dimensional stress intervention and aquatic environment regulation, in order to overcome the technical challenge of non-destructive protection throughout the entire process from fishing to transportation. Summary of the Invention

[0004] The present invention aims to provide a non-destructive harvesting device for Japanese shrimp broodstock, in order to solve the problems of mechanical damage, environmental stress and physiological metabolic disorders that shrimp broodstock are susceptible to during the harvesting, lifting and transportation of traditional harvesting methods, and to achieve efficient, non-destructive and intelligent harvesting and protection of Japanese shrimp broodstock.

[0005] This invention employs the following technical solution: a non-destructive harvesting device for broodstock Japanese shrimp, comprising a harvesting net and a storage box. The storage box contains a buffer suspension module, which includes a flexible, permeable outer shell and a composite gel filled within it. The composite gel is a non-Newtonian fluid material composed of a shear-thickening fluid and a phase-change material (PCM) at room temperature. The macroscopic mechanical behavior of this composite gel exhibits significant state variability. Under normal conditions or under slow pressure (such as when the shrimp is embedded), its shear force is below a first threshold. At this time, the microparticles in the shear-thickening fluid (STF) are uniformly suspended in the phase-change material (PCM) carrier, and the particles are sufficiently lubricated, allowing them to slide freely. In this state, the composite gel exhibits a soft, malleable, mud-like texture, allowing broodstock Japanese shrimp to easily embed and receive flexible support, avoiding initial stress. When the device is subjected to a severe, instantaneous impact (such as during lifting or handling collisions), its shear force instantly exceeds the first threshold, triggering the material's "shear thickening" effect: the external force forces the gel to deform rapidly, causing the PCM liquid between particles to not have enough time to lubricate them. The microparticles are forced to directly contact, collide, and rub against each other, instantly forming a temporary, interlocked "force chain network." This instantaneous reorganization of the microstructure manifests macroscopically as a sharp increase in the material's apparent viscosity, instantly transforming from a soft, normal state to a hard solid state within milliseconds. This efficiently disperses and absorbs impact energy, resists further deformation, and provides near-rigid instantaneous protection for the shrimp, preventing damage from rolling and collisions within the storage tank. Once the impact force disappears, the shear force applied to the material also disappears, the temporarily formed force chain network immediately disintegrates, the PCM carrier flows again and lubricates the particles, allowing the material to quickly return to its initial soft and malleable state, achieving a rapid, reversible, and adaptive intelligent protection cycle. The selected PCM, such as a decanoic acid-lauric acid mixture or n-heptadecane, has a phase transition temperature that closely matches the survival water temperature of Japanese shrimp broodstock. It not only serves as a suspension carrier for STF particles but also absorbs or releases a large amount of heat energy through its phase transition process, helping to maintain the stability of the gel's internal temperature and preventing increased metabolism in the shrimp due to temperature fluctuations. Simultaneously, the flexible, permeable outer shell encasing this composite gel not only deforms in tandem with the internal gel to mimic the soft texture of a natural matrix but also ensures free exchange of water between the inside and outside of the storage tank, continuously providing dissolved oxygen for the broodstock during temporary rearing. It is worth noting that this flexible, permeable outer shell is not an ordinary fishing net; it is actually a selectively permeable membrane or microporous membrane. The pore size is much larger than that of water molecules but much smaller than the clusters or structural units of the gel itself. The flexible, permeable outer shell allows free exchange of small molecules such as water and dissolved oxygen while effectively blocking any macroscopic migration of the gel material.

[0006] Furthermore, the storage tank is connected to a slow-release unit for releasing the dormancy inducer. When the shrimp enters the fishing net and comes into contact with the storage tank, the first round of dormancy inducer release is triggered. This aims to quickly calm the shrimp during the initial stress phase, when they struggle and collide violently due to being trapped, by chemically inducing them into a dormant-like state of tranquility. This prevents mechanical damage and metabolic disturbances caused by panic and physical struggle from the outset. The second round of dormancy inducer release is triggered when the device leaves the water. As the device is lifted off the water, the shrimp experience sudden changes in environmental factors such as temperature, pressure, and humidity, initiating the second round of dormancy inducer release. This aims to replenish and maintain the concentration of sedatives in the shrimp's body in time when a secondary stress is about to occur or has just occurred, enhancing the dormancy effect and ensuring that the shrimp remain calm throughout the subsequent lifting, handling, and initial transportation stages, effectively resisting the impact of drastic environmental changes.

[0007] Furthermore, the storage tank is equipped with a flexible pressure airbag, which is connected to a pressure control unit and can be inflated and deflated according to a preset program. The flexible pressure airbag operates according to the preset program to apply gentle, periodic physical pressure stimulation to the Japanese shrimp parent organisms embedded in the buffer suspension module, in order to simulate their natural habitat or induce them to enter a sedative state.

[0008] Furthermore, a light source emitting module is installed inside the fishing net. Micro LEDs that emit specific wavelengths (such as 470nm deep blue) are integrated within the net. Utilizing the positive phototaxis of Japanese shrimp to specific light at certain developmental stages, deep blue light can serve as an induction signal, guiding the shrimp to more actively and smoothly enter and remain in the core area of ​​the fishing net.

[0009] Furthermore, a flow guide shroud is installed at the inlet of the fishing net, with adjustable-angle guide vanes inside. The shroud's shell adopts a streamlined / teardrop / flare-mouth design. Preferably, the internal channel of the shroud is designed as a multi-stage, gradually narrowing flare-mouth structure. After entering this structure, shrimp have difficulty quickly locating their original straight path, increasing the difficulty of their escape against the current. The guide vanes are made of flexible materials such as rubber or silicone. Their core function is to transform the chaotic, high-speed turbulence at the inlet into a uniform, stable laminar flow, thereby gently guiding the water flow and avoiding mechanical impact on the shrimp. Figure 4 and Figure 5 This is a schematic cross-sectional view of the airfoil of the guide vanes inside the deflector. The airfoil surface of the guide vanes is parallel to the direction of water flow or forms an angle of 0° to 15°. The guide vanes are connected to an adjustment mechanism that drives their rotation. By changing the angle of the guide vanes, the velocity of the incoming water flow is controlled. The adjustable angle of the guide vanes allows for dynamic optimization based on actual sea conditions, water flow velocity, and pump power, ensuring the formation of the most ideal flow field under various operating conditions.

[0010] Furthermore, an acoustic induction component is installed inside the storage tank to emit acoustic signals. The acoustic induction component can emit specific sound wave signals that match the biological habits of the Japanese shrimp parent, thereby actively inducing the Japanese shrimp to enter the storage tank and keeping them stable, reducing their stress response and escape attempts.

[0011] Furthermore, the storage tank is connected to a water quality conditioning module, which includes at least one of a temperature control unit, an oxygenation unit, and a biological filtration unit.

[0012] Furthermore, the outlet of the fishing net is rotatably connected to the inlet of the storage tank via a connecting ring. The inlet of the storage tank is equipped with a sealable and closable door, which is connected to a rotary motor. The connecting ring can be implemented in any of the following ways: it is composed of rolling or sliding bearings; it is composed of multiple circumferentially distributed hinges; or it is composed of a flexible sleeve and a clamp that locks its two ends to the fishing net and the storage tank. Its core objective is to allow the two components to rotate relative to each other in the connected state to accommodate the torque during water flow impacts, lifting, etc., and to prevent damage to the device. In addition, the rotatable design allows the fishing net to change its posture in flowing water and achieve self-cleaning by water flow scouring.

[0013] The device also includes a control unit, which communicates with and centrally controls the buffer suspension module, the dormancy inducer slow-release unit, the flexible pressure airbag and its pressure control unit, the light source emission module, the adjustment mechanism of the guide vanes, the rotary motor, the acoustic induction component, and the water quality adjustment module.

[0014] The core advantage of this invention lies in its ability to achieve comprehensive, non-destructive protection and efficient harvesting of Japanese shrimp broodstock through a highly integrated and intelligent harvesting device. The core of this device is the use of a composite gel material with shear-thickening properties and phase-change temperature control. This material provides the shrimp with a soft, mud-like support under normal conditions, but rapidly transforms into a rigid state upon impact, reversibly absorbing and dispersing external impact energy, effectively preventing physical damage to the shrimp during harvesting and handling. Simultaneously, the device integrates a dormancy inducer slow-release unit, acoustic induction components, flexible pressure airbags, and a light source induction module. Through synergistic effects from chemical, acoustic, physical, and optical dimensions, it actively induces the shrimp into a calm or dormant state, significantly reducing their panic and struggling behavior caused by drastic environmental changes and harvesting operations. In terms of fluid control, the optimized flow guide and adjustable-angle guide vane design transforms the turbulent flow at the inlet into a stable laminar flow, minimizing the mechanical impact of the water flow on the shrimp. Furthermore, the rotatable connection between the fishing net and the storage tank not only adapts to water flow dynamics and prevents structural damage but also utilizes the water flow for self-cleaning of the net. All functional modules of this invention are uniformly controlled by the control unit, achieving automated, programmed, and precise management of the fishing process, thus improving operational efficiency and system reliability. Attached Figure Description

[0015] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall device for the non-destructive harvesting of Japanese shrimp broodstock according to the present invention.

[0017] Figure 2 This is a schematic diagram of the fishing net in Example 1.

[0018] Figure 3 This is a schematic diagram of the storage box in Example 1.

[0019] Figure 4 This is a schematic diagram of the guide vane in Example 1 (the vane is parallel to the direction of water flow).

[0020] Figure 5 This is a schematic diagram of the guide vane in Example 1 (the vane forms an angle of 0° to 15° with the direction of water flow).

[0021] Figure descriptions: 1-Fishing net body; 11-Guide shroud; 111-Shell; 112-Guide blade; 12-Light source emission module; 13-Connecting ring; 2-Storage tank; 21-Buffer suspension module; 22-Flexible pressure airbag; 23-Acoustic induction component; 3-Dormancy inducer slow release unit; 4-Control unit; 5-Water quality conditioning module. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Example 1 See Figures 1-3 A non-destructive harvesting device for Japanese shrimp broodstock includes a harvesting net 1 and a storage box 2. The storage box 2 is equipped with a buffer suspension module 21. The buffer suspension module 21 includes a flexible and water-permeable shell and a composite gel filled therein. The composite gel is a non-Newtonian fluid material composed of a shear-thickening fluid and a room-temperature phase change material.

[0025] The macroscopic mechanical behavior of this composite gel exhibits significant state variability. Under normal conditions or under slow pressure (such as when the shrimp is embedded), its shear force is below a first threshold. At this time, the microparticles in the shear-thickening fluid (STF) are uniformly suspended in the phase change material (PCM) carrier, and the particles are fully lubricated and can slide freely. In this state, the composite gel as a whole exhibits a soft, malleable, mud-like texture, allowing the Japanese shrimp to easily embed and receive flexible support, avoiding initial stress. When the device is subjected to a severe, instantaneous impact (such as during lifting or handling), its shear force instantaneously exceeds the first threshold, triggering the material's "shear-thickening" effect. The external force forces the gel to deform rapidly, causing the PCM liquid between the particles to not have time to lubricate, and the microparticles are forced to directly contact, collide, and rub against each other, instantly forming a temporary, interlocked "force chain network" or particle cluster. This instantaneous reorganization of the microstructure manifests macroscopically as a sharp increase in the material's apparent viscosity, instantly transforming from a soft state to a hard solid state, thereby effectively dispersing and absorbing impact energy, resisting further deformation, and providing near-rigid protection for the shrimp. Here, PCM can be a decanoic acid-lauric acid mixture or n-heptadecane. The phase transition temperature needs to be closely matched to the survival water temperature of the Japanese shrimp broodstock. PCM not only serves as a suspension carrier for STF particles, but its phase transition process also absorbs a large amount of heat energy, helping to maintain the stability of the gel's internal temperature and preventing the shrimp from undergoing excessive metabolism due to high temperatures. Once the impact force disappears, the shear force applied to the material also disappears, and the temporarily formed force chain network immediately disintegrates. The PCM carrier reflows and lubricates the particles, and the material recovers its initial soft and malleable state within milliseconds. This rapid, reversible, and adaptive state switching achieves dynamic, intelligent, and non-destructive protection for Japanese shrimp broodstock in complex operating environments.

[0026] Specifically, the storage tank 2 is connected to a dormancy inducer slow-release unit 3 for releasing the dormancy inducer. When a shrimp enters the fishing net 1 and comes into contact with the storage tank 2, the first round of dormancy inducer release is triggered. This is to quickly calm the shrimp during the initial stress phase, when they struggle and collide violently due to being trapped, through chemical induction, putting them into a quiet state similar to dormancy. This prevents mechanical damage and physiological metabolic disorders caused by panic and physical struggle from the outset. The second round of dormancy inducer release is triggered when the device leaves the water. When the device is lifted off the water, the shrimp experience sudden changes in environmental factors such as temperature, pressure, and humidity, initiating the second round of dormancy inducer release. This is to replenish and maintain the concentration of sedatives in the shrimp's body in time when a secondary stress is about to occur or has just occurred, enhancing the dormancy effect and ensuring that the shrimp remain quiet during subsequent lifting, handling, and initial transportation stages, effectively resisting the impact of drastic environmental changes.

[0027] Specifically, the storage box 2 is also equipped with a flexible pressure airbag 22, which is connected to a pressure control unit and can be inflated and deflated according to a preset program. The flexible pressure airbag 22 operates according to the preset program to apply gentle, periodic physical pressure stimulation to the Japanese shrimp parent body embedded in the buffer suspension module 21, so as to simulate its natural habitat or induce it to enter a sedative state.

[0028] Specifically, the fishing net 1 is equipped with a light source emitting module 12. A miniature LED capable of emitting a specific wavelength (such as 470nm deep blue) is integrated within the fishing net 1. Utilizing the positive phototaxis of Japanese shrimp to specific light at certain developmental stages, deep blue light can serve as an induction signal, guiding the shrimp to more actively and smoothly enter and remain in the core area of ​​the fishing net 1.

[0029] Specifically, the inlet of the fishing net 1 is equipped with a flow guide shroud 11, and the inside of the flow guide shroud 11 is equipped with adjustable-angle flow guide blades 112. The shell 111 of the flow guide shroud adopts a streamlined / teardrop / flare-mouth design. Preferably, the internal channel of the flow guide shroud 11 is designed as a multi-stage gradually narrowing flare-mouth structure. After shrimp enter this structure, it is difficult for them to quickly locate the straight path they came from, increasing the difficulty of their escape against the current. The flow guide blades 112 are made of flexible materials such as rubber or silicone. Their core function is to transform the chaotic and high-speed turbulence at the inlet into a uniform and stable laminar flow, thereby gently guiding the water flow and avoiding mechanical impact on the shrimp. Figure 4 and Figure 5 This is a schematic cross-sectional view of the airfoil of the guide vane 112 inside the flow deflector 11. The airfoil surface of the guide vane 112 is parallel to the water flow direction or forms an angle of 0° to 15°. The guide vane 112 is connected to an adjustment mechanism that drives its rotation. By changing the angle of the guide vane, the velocity of the incoming water flow can be controlled. The adjustable angle of the guide vane 112 allows it to be dynamically optimized according to actual sea conditions, water flow velocity, and pump power, ensuring that the most ideal flow field can be formed under various operating conditions.

[0030] Specifically, the storage box 2 is equipped with an acoustic induction component 23 for emitting acoustic signals. The acoustic induction component 23 can emit specific sound wave signals that match the biological habits of the Japanese shrimp parent, thereby actively inducing the Japanese shrimp to enter the storage box 2 and keeping them stable, reducing their stress response and escape attempts.

[0031] Specifically, it also includes a water quality adjustment module 5, which is connected to the storage tank 2 and includes at least one of a temperature control unit, an oxygenation unit, and a biological filtration unit.

[0032] Specifically, the outlet of the fishing net 1 is rotatably connected to the inlet of the storage box 2 via a connecting ring 13. The inlet of the storage box 2 is equipped with a sealable and closable door, which is connected to a rotary motor. The connecting ring 13 can be implemented in any of the following ways: it is composed of rolling bearings or sliding bearings; it is composed of multiple hinges distributed circumferentially; it is composed of a flexible sleeve and a clamp that locks its two ends to the fishing net 1 and the storage box 2. Its core objective is to allow the two components to rotate relative to each other in the connected state to adapt to the torque during water flow impact, lifting, etc., and to prevent damage to the device. In addition, the rotatable design allows the fishing net 1 to change its posture in flowing water and achieve self-cleaning by water flow scouring.

[0033] Specifically, it also includes a control unit 4, which is communicatively connected to and centrally controls the buffer suspension module 21, the dormancy inducer slow release unit 3, the flexible pressure airbag 22 and its pressure control unit, the light source emission module 12, the adjustment mechanism of the guide vane 112, the rotary motor, the acoustic induction component 23, and the water quality adjustment module 5.

[0034] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art may make some modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but these should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0035] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A device for non-destructive harvesting of live Japanese shrimp, comprising a harvesting net (1) and a storage box (2), characterized in that, The storage box (2) is equipped with a buffer suspension module (21). The buffer suspension module (21) includes a flexible and water-permeable shell and a composite gel filled therein. The composite gel is a non-Newtonian fluid material composed of a shear-thickening fluid and a room-temperature phase change material.

2. The Japanese shrimp broodstock harvesting device according to claim 1, characterized in that, The storage box (2) is connected to the dormancy inducer slow-release unit (3) for releasing the dormancy inducer.

3. The Japanese shrimp broodstock harvesting device according to claim 1, characterized in that, The storage box (2) is also equipped with a flexible pressure airbag (22), which is connected to a pressure control unit and can be inflated and deflated according to a preset program.

4. The device for non-destructive harvesting of live Japanese shrimp according to claim 1, characterized in that, The fishing net (1) is equipped with a light source emitting module (12).

5. The Japanese shrimp broodstock harvesting device according to claim 1, characterized in that, The fishing net (1) is provided with a guide hood (11) at the water inlet, and the guide hood (11) is provided with an adjustable angle guide blade (112).

6. The Japanese shrimp broodstock harvesting device according to claim 5, characterized in that, The guide vane (112) is connected to an adjustment mechanism that drives its rotation, and the flow rate of the inflowing water is controlled by changing the angle of the guide vane.

7. The Japanese shrimp broodstock harvesting device according to claim 1, characterized in that, The storage box (2) is equipped with an acoustic induction component (23) for emitting acoustic signals.

8. The device for non-destructive harvesting of live Japanese shrimp according to claim 1, characterized in that, It also includes a water quality adjustment module (5), which is connected to the storage tank (2) and includes at least one of a temperature control unit, an oxygenation unit, and a biological filtration unit.

9. The device for non-destructive harvesting of live Japanese shrimp according to claim 1, characterized in that, The outlet of the fishing net (1) is rotatably connected to the inlet of the storage box (2) via a connecting ring (13).

10. The device for non-destructive harvesting of live Japanese shrimp according to claim 1, characterized in that, The entrance of the storage box (2) is provided with a sealable door that can be opened and closed, and the door is connected to a rotary motor.

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