Fresh and live shrimp transportation device and transportation method

Abstract

The fresh and live shrimp transporting device comprises a container, the interior of the container is hollow to form a containing cavity, an air inlet which can be opened and closed and is used for filling oxygen into the containing cavity is formed in the side wall of the container, a partition wall is vertically arranged in the containing cavity in a partition mode, and a containing space used for containing live shrimps is formed in the containing cavity in a partition mode; the height of the partition wall is lower than that of the containing cavity, a ventilation opening is formed in the partition wall, the partition wall sequentially comprises a supporting plate, a first adsorbent layer used for adsorbing carbon dioxide, a breathable waterproof film and a first water retention cotton layer from inside to outside, and the first adsorbent layer wraps and is attached to the outer surface of the supporting plate through the breathable waterproof film. And the first water retention cotton layer is coated outside the breathable waterproof film. The concentration of carbon dioxide gas in the containing cavity in the transportation process can be greatly reduced, it is ensured that the concentration of carbon dioxide in the transportation process is kept within the safe survival range of live shrimps, and the survival rate of the live shrimps in the transportation process is increased.

Description

Technical Field

[0001] The present invention relates to the field of aquatic product transportation, and in particular to a fresh shrimp transportation device and a transportation method. Background Art

[0002] Shrimp are rich in nutrients such as protein, multiple vitamins and minerals, and are widely favored for their superior taste and nutritional properties. There are many types of shrimp, which can be divided into marine shrimp and freshwater shrimp according to their production sources. Marine shrimp can be divided into lobsters, prawns, etc. Among them, the Vannamei shrimp, also known as whiteleg shrimp or prawns, is widely farmed in many coastal provinces of my country. As a high-quality aquatic product, the market demand for whiteleg shrimp continues to grow. In 2022, my country's total production of whiteleg shrimp was about 2.1 million tons, accounting for about one-third of the world's whiteleg shrimp production, and also exceeding one-third of the total farming volume of various shrimp species in my country.

[0003] Shrimp and other aquatic products are rich in endogenous enzymes, which can lead to protein autolysis and polyphenol oxidation within a few hours of death, resulting in quality degradation. Although cold storage techniques (refrigeration and freezing) can maintain shrimp quality, live shrimp are still preferred by Chinese consumers because their meat quality and nutritional value far exceed those of frozen and refrigerated products.

[0004] Waterless transportation of aquatic products is a technology that transports live aquatic products without using water as a medium. Its core principle is to induce the target organism into a physiological dormancy or semi-dormancy state, significantly reducing its metabolic rate and oxygen consumption, allowing it to survive out of water long enough to meet transportation requirements. Compared to water-based transportation, waterless transportation offers advantages such as reduced weight and higher efficiency, effectively reducing transportation costs and holding significant benefits for aquaculture and market supply. However, during waterless transportation, the respiration of live shrimp leads to the continuous production of carbon dioxide. Because there is insufficient water in the waterless environment to absorb and buffer the generated carbon dioxide, the carbon dioxide concentration continues to rise. Excessive carbon dioxide concentrations can disrupt the shrimp's acid-base balance, leading to physiological disturbances, acidosis, hypercapnia, and even death. This significantly increases transportation losses and severely impacts the economic benefits of live shrimp farming and market supply. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a fresh shrimp transportation device capable of effectively improving the survival rate of shrimps during waterless transportation in response to the existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a transportation method using the above-mentioned fresh shrimp transportation device in view of the existing technology.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a fresh shrimp transport device, characterized in that it includes a square container with a hollow interior to form a cavity, an air inlet that can be opened and closed and is used to fill the cavity with oxygen is opened on the side wall of the container, a partition wall is vertically separated in the cavity to separate the cavity into a storage space for placing live shrimp, and the height of the partition wall is lower than the height of the cavity, and a vent for gas circulation is formed above the partition wall.

[0008] The partition wall includes, from the inside to the outside, a support plate with a certain hardness and a porous structure, a first adsorbent layer for adsorbing carbon dioxide, a breathable and waterproof membrane, and a first water-retaining cotton layer. The first adsorbent layer is covered with the breathable and waterproof membrane and attached to the outer surface of the support plate, while the first water-retaining cotton layer is covered outside the breathable and waterproof membrane.

[0009] Furthermore, the oxygen filled into the cavity through the air inlet is oxygen with a certain humidity (the humidity of oxygen is 9%-13%). Oxygen with a certain humidity is not only beneficial for maintaining the humidity of the cavity during transportation, but also helps to reduce the stress response of live shrimp during transportation, thereby improving the survival rate of live shrimp.

[0010] Furthermore, the first adsorbent layer includes a first adsorbent for adsorbing carbon dioxide, the first adsorbent including soda lime, silica and calcium peroxide, and the mass fractions of each component are: 60-75 parts of soda lime, 15-25 parts of silica, and 10-15 parts of calcium peroxide.

[0011] Soda lime has a strong chemical absorption capacity for carbon dioxide, completing the chemical absorption of carbon dioxide by the first adsorbent. The addition of silica allows the first adsorbent layer to form a three-dimensional skeleton structure, which, in conjunction with the support plate, provides auxiliary support, thereby improving the stability of the overall structure of the partition wall. Furthermore, the addition of silica increases the porosity of the support wall from 35% to 50-55%. This increased porosity expands the specific surface area of the partition wall, providing more adsorption sites for CO2 molecules and enhancing carbon dioxide adsorption efficiency. Furthermore, the high-porosity structure achieved by the addition of silica promotes uniform oxygen distribution, thereby better adsorbing water molecules in the oxygen and stabilizing the humidity inside the container. Calcium peroxide reacts with water to slowly release oxygen, maintaining the oxygen concentration in the chamber during transportation. In the present invention, the oxygen flow entering the chamber from the air inlet has a certain humidity. This allows steam molecules (water vapor) in the oxygen flow to sequentially pass through the first water-retaining cotton layer and the breathable and waterproof membrane and enter the first adsorbent. The steam molecules react with the calcium peroxide in the first adsorbent to slowly produce oxygen, replenishing the oxygen in the chamber. The calcium hydroxide produced by the reaction can also be used to adsorb carbon dioxide. Furthermore, after the steam molecules in the oxygen flow entering the chamber react with the calcium peroxide, the oxygen flow density increases and tends to sink, facilitating oxygen inhalation by the live shrimp in the storage space.

[0012] Furthermore, the inner top surface of the container is provided with a second adsorbent layer for absorbing carbon dioxide and a non-woven fabric layer for covering the second adsorbent layer. The second adsorbent layer comprises a second adsorbent for absorbing carbon dioxide, comprising calcium hydroxide. Furthermore, by providing the second adsorbent layer at the top of the cavity, it cooperates with the first adsorbent layer of the partition wall to form a comprehensive, multi-layered carbon dioxide absorption system, thereby improving the efficiency of carbon dioxide adsorption. Furthermore, the second adsorbent layer at the top of the cavity tends to cause carbon dioxide gas in the cavity to flow upward, preventing carbon dioxide produced by the live shrimp from respiration from being deposited in the lower portion. Simultaneously, the steam molecules in the oxygen flow entering the cavity react with the calcium peroxide, increasing the density of the oxygen flow and causing it to sink. This sinking oxygen flow disrupts the upward flow of the carbon dioxide flow, thereby forming an airflow pattern in the cavity where the oxygen flow tends to sink and the carbon dioxide tends to float upward. This increases the oxygen concentration and reduces the carbon dioxide concentration in the vicinity of the live shrimp, thereby improving the survival rate of the live shrimp. Preferably, the mass ratio of the first adsorbent to the second adsorbent in the container is 3:1.

[0013] Furthermore, the nonwoven fabric layer is constructed into a concave-convex structure with hemispherical convex hulls spaced apart, and the second adsorbent is filled in each hemispherical convex hull. Designing the second adsorbent layer into a concave-convex structure can cause the concentration of carbon dioxide gas at the top of the cavity to be distributed in a high-low distribution (the carbon dioxide concentration at each hemispherical convex hull is lower than the carbon dioxide concentration in the depressions between adjacent hemispherical convex hulls), thereby increasing the flow rate of the carbon dioxide gas flow and thereby improving the carbon dioxide adsorption efficiency.

[0014] Further, the support plate is a plant fiber board, which is composed of a composite of rice husk and coconut shell, and the mass ratio of rice husk and coconut shell is 2: 3. Plant fiber board is a natural environmentally friendly material, which can avoid pollution to the environment, and can restore its adsorption function in an appropriate manner after use, so as to achieve recycling. The plant fiber board in the present invention is specifically composed of a composite of rice husk and coconut shell with a mass ratio of 2: 3, wherein the rice husk fiber board has high hardness, high rigidity, excellent compressive and flexural strength performance, and the coconut shell fiber board has outstanding toughness, impact resistance and elasticity, so the plant fiber board composed of the two is both strong and not easy to break, and the structure is stable and not easy to deform, and can well achieve supporting effect, realize skeleton function in the partition wall, and can further expand surface area, provide more adsorption sites for the adsorption of carbon dioxide molecules, and enhance the physical adsorption effect on carbon dioxide molecules. It can be seen that the composite of rice husk and coconut shell in the present invention is not only a physical mixed superposition, but also a chemical synergy in performance.

[0015] Furthermore, the breathable and waterproof membrane is a PU membrane. PU membrane (polyurethane film) has the advantages of high elasticity, flexibility, tear resistance, and wear resistance. It can effectively coat the first adsorbent layer on the outer surface of the support plate. It is safe and environmentally friendly, ensuring the safety of shrimp for consumption. In addition, it has good breathability and waterproof properties.

[0016] Furthermore, a second water-retaining cotton layer is provided on the inner surface of the container, thereby better maintaining the humidity inside the container during the transportation of live shrimps.

[0017] Furthermore, there are at least two containers, each stacked one above the other and detachably connected to adjacent containers. Furthermore, a lid is detachably mounted on the top of the top container, with a handle provided for carrying. This facilitates assembly and disassembly of the device, allowing for flexible adjustment of the number of containers based on the number of live shrimp to be transported. The lid with a handle also facilitates easy handling of the device, thereby improving transportation efficiency.

[0018] The technical solution adopted to further solve the second technical problem is: a transportation method using the fresh shrimp transportation device as described above, characterized by comprising the following steps:

[0019] (1) Temporary culture: Fresh shrimp are temporarily cultured in a water environment with a water temperature of 20℃ to 25℃, a salinity of 35‰, and dissolved oxygen > 5mg / L, with continuous oxygenation and no feeding. The water temperature for temporary culture is preferably 21℃ to 23℃. The criteria for judging fresh shrimp generally include the following conditions: the shrimp's body surface is transparent, uniform in color, and shiny; its limbs (swimming legs, tentacles) continue to swing after leaving the water; it bounces violently when touched; its gill filaments are bright red or pink, intact in structure, without mucus accumulation, its eyeballs are prominent and transparent, and its cornea is not cloudy.

[0020] (2) Cold shock: After 2 hours of temporary storage, the shrimps are taken out and placed in 12℃~15℃ water for 3 minutes until all the shrimps enter a dormant state of suspended animation; wherein, the cold shock water temperature is preferably 13℃~14℃. The dormant state of suspended animation is that the shrimps lie on their sides at the bottom of the water with their feet moving slowly and regularly.

[0021] (3) Oxygen-filled packaging: The dormant shrimps are removed and drained, and then placed in each of the accommodating spaces of the above-mentioned fresh shrimp transport device. Oxygen with a certain humidity is introduced through the air inlet. The initial oxygen concentration of each container is 99%, the initial air humidity is 60% to 65%, and the initial temperature is 20° C. to 25° C.;

[0022] (4) Transportation: The transportation temperature inside each container is controlled at 10°C to 20°C, and the transportation time does not exceed 20 hours; the transportation temperature is preferably 15°C.

[0023] (5) Recovery: Take out the dormant shrimp and put them into water at room temperature to recover.

[0024] Compared with the existing technology, the advantages of the present invention are: by setting a partition wall, the container cavity is divided into accommodating spaces, and live shrimp are placed in each accommodating space. By placing the live shrimp in different areas, the risk of collision and squeezing between the live shrimp can be reduced, which is conducive to improving the survival rate of the live shrimp during transportation.

[0025] Furthermore, the partition wall in the present invention includes, from the inside to the outside, a support plate, a first adsorbent layer, a breathable waterproof membrane, and a first water-retaining cotton layer, wherein the first water-retaining cotton layer can maintain the humidity inside the container during transportation, and the breathable waterproof membrane can, on the one hand, enable the first adsorbent layer to adhere to the outer surface of the support plate, and on the other hand, can prevent liquid water from penetrating into the first adsorbent layer, while allowing gas (including water vapor) to pass through. In this way, during transportation, the carbon dioxide gas in the cavity can pass through the first water-retaining cotton layer and the breathable waterproof membrane in turn to reach the first adsorbent layer, chemical absorption of carbon dioxide is achieved through the first adsorbent layer, and part of the carbon dioxide gas passes through the first adsorbent layer to reach the support plate. The support plate has a certain hardness and a porous structure. On the one hand, it is the skeleton structure of the partition wall, which supports the first adsorbent layer, the breathable waterproof membrane, and the first water-retaining cotton layer. On the other hand, its porous structure can provide physical adsorption sites for carbon dioxide gas, thereby achieving physical adsorption of carbon dioxide gas.

[0026] It can be seen that the present invention can greatly reduce the carbon dioxide gas concentration in the cavity during the transportation process by combining chemical absorption and physical adsorption, ensure that the carbon dioxide concentration during transportation is maintained within the safe range for the survival of live shrimps, and improve the survival rate of live shrimps during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of a fresh shrimp transport device according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a container in an embodiment of the present invention;

[0029] Figure 3 for Figure 2 A schematic diagram of the structure in another direction;

[0030] Figure 4 is a cross-sectional view of a partition wall in an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the structure of the top wall of the container in an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the changes in carbon dioxide content in the experimental group and the control group of the present invention;

[0033] Figure 7 Schematic diagram of humidity changes in the experimental group and the control group of the present invention;

[0034] Figure 8 This is a schematic diagram of the survival rate of the experimental shrimp in the experimental group and the control group of the present invention;

[0035] Figure 9 HCO3 in the blood of the experimental group and the control group of the present invention- Content diagram, Note: Different lowercase letters indicate significant differences between the same treatment at different times (p<0.05), and different uppercase letters indicate significant differences between the same treatment at different times (p<0.05);

[0036] Figure 10 Schematic diagram of CO2 partial pressure in the blood of shrimp in the experimental group and the control group of the present invention. Note: Different lowercase letters indicate significant differences (p<0.05) between the same treatment at different times; different uppercase letters indicate significant differences (p<0.05) between different treatments at the same time.

[0037] Figure 11 Schematic diagram of the total CO2 content in the blood of the experimental shrimp in the experimental group and the control group of the present invention. Note: Different lowercase letters indicate significant differences (p < 0.05) between the same treatment at different times; different uppercase letters indicate significant differences (p < 0.05) between different treatments at the same time;

[0038] Figure 12 Schematic diagram of humidity changes in the experimental group of the present invention and comparative group 1;

[0039] Figure 13 Schematic diagram of the survival rate of the experimental shrimp in the experimental group of the present invention and the comparative group 1;

[0040] Figure 14 Schematic diagram of the changes in carbon dioxide content in the experimental group of the present invention and the comparative group 2;

[0041] Figure 15 Schematic diagram of the survival rate of the experimental shrimp in the experimental group of the present invention and the comparative group 2. DETAILED DESCRIPTION

[0042] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0044] Example:

[0045] like Figures 1 to 5 As shown, a fresh shrimp transportation device includes a square container 1. The container 1 is hollow inside to form a cavity 10. An openable and closable air inlet 11 is provided on the side wall of the container 1 for filling the cavity 10 with oxygen. A partition wall 2 is vertically provided in the cavity 10 to separate the cavity 10 into a storage space 100 for placing live shrimp. The height of the partition wall 2 is lower than that of the cavity 10, and a vent 8 for gas circulation is formed above the partition wall 2.

[0046] Further, if Figure 4 As shown, the partition wall 2 includes, from the inside to the outside, a support plate 21 having a certain hardness and a porous structure, a first adsorbent layer 22 for adsorbing carbon dioxide, a breathable and waterproof membrane 23, and a first water-retaining cotton layer 24. The first adsorbent layer 22 is coated and attached to the outer surface of the support plate 21 through the breathable and waterproof membrane 23, and the first water-retaining cotton layer 24 is coated outside the breathable and waterproof membrane 23.

[0047] The device of the present invention divides the cavity 10 of the container 1 into accommodating spaces 100 by providing a partition wall 2. Live shrimp are placed in each accommodating space 100. By placing the live shrimp in different zones, the risk of collision and squeezing between the live shrimp can be reduced, thereby improving the survival rate of the live shrimp during transportation. In addition, the partition wall 2 of the present invention includes, from the inside to the outside, a support plate 21, a first adsorbent layer 22, a breathable and waterproof membrane 23, and a first water-retaining cotton layer 24. Among them, the first water-retaining cotton layer 24 can maintain the humidity inside the container 1 during transportation. The breathable and waterproof membrane 23 can, on the one hand, achieve the adhesion of the first adsorbent layer 22 to the outer surface of the support plate 21, and on the other hand, prevent liquid water from penetrating the first adsorbent layer 22, while allowing gas (including water vapor) to pass through. In this way, during transportation, the carbon dioxide gas in the cavity 10 can pass through the first water-retaining cotton layer 24 and the breathable and waterproof membrane 23 in sequence to reach the first adsorbent layer 22, and chemical absorption of carbon dioxide is achieved by the first adsorbent layer 22. Part of the carbon dioxide gas passes through the first adsorbent layer 22 and reaches the support plate 21. The support plate 21 has a certain hardness and a porous structure. On the one hand, it serves as the skeleton structure of the partition wall 2, supporting the first adsorbent layer 22, the breathable and waterproof membrane 23, and the first water-retaining cotton layer 24. On the other hand, its porous structure can provide physical adsorption sites for carbon dioxide gas, thereby realizing physical adsorption of carbon dioxide gas.

[0048] It can be seen that the present invention can greatly reduce the carbon dioxide gas concentration in the cavity 10 during the transportation process by combining chemical absorption and physical adsorption, ensure that the carbon dioxide concentration during transportation is maintained within the safe range for the survival of live shrimps, and improve the survival rate of live shrimps during transportation.

[0049] In this embodiment, the first water-retaining cotton layer 24 is removably secured by Velcro 9. Furthermore, in the container 1 of this embodiment, there are three partition walls 2, spaced evenly along the left and right sides of the container 1, and each partition wall 2 extends along the front-to-back direction of the container 1. There are two air inlets 11, one on each left and right side of the container 1, each air inlet 11 facing a corresponding partition wall 2. Each air inlet 11 is provided with an air inlet valve 7 for controlling the opening and closing of the air inlet 11.

[0050] Furthermore, the oxygen introduced into the chamber 10 through each of the air inlets 11 is oxygen with a certain humidity. Oxygen with a certain humidity not only helps maintain the humidity of the chamber 10 during transportation, but also helps reduce stress during transportation of live shrimp, thereby increasing the survival rate of the live shrimp. In this embodiment, the specific humidity of the oxygen introduced into the chamber 10 is 9%-13%.

[0051] Furthermore, the first adsorbent layer 22 includes a first adsorbent for adsorbing carbon dioxide. The first adsorbent includes soda lime, silica, and calcium peroxide, with the weight percentages of each component being 60-75 parts soda lime, 15-25 parts silica, and 10-15 parts calcium peroxide. In this embodiment, the first adsorbent preferably comprises 65 parts soda lime, 25 parts silica, and 10 parts calcium peroxide.

[0052] The soda lime in the first adsorbent has a strong chemical absorption capacity for carbon dioxide gas, completing the chemical absorption of carbon dioxide gas by the first adsorbent. The additional addition of silica allows the first adsorbent layer to form a three-dimensional skeleton structure, which, in conjunction with the support plate, provides auxiliary support, thereby improving the stability of the overall structure of the partition wall. Furthermore, the addition of silica increases the porosity of the support wall from 35% to 50-55%. This increased porosity expands the specific surface area of the partition wall, thereby providing more adsorption sites for CO2 molecules and enhancing the carbon dioxide adsorption efficiency. Furthermore, the high-porosity structure achieved by the addition of silica promotes uniform oxygen distribution, thereby better adsorbing water molecules in the oxygen and stabilizing the humidity inside the container. Calcium peroxide reacts with water to slowly release oxygen, maintaining the oxygen concentration in the container 10 during transportation. Furthermore, in the present invention, the oxygen flow entering the chamber 10 from the air inlet 11 has a certain humidity. This allows the steam molecules (water vapor) in the oxygen flow to sequentially pass through the first water-retaining cotton layer 24 and the breathable and waterproof membrane 23 and enter the first adsorbent layer 22. The steam molecules react with the calcium peroxide in the first adsorbent to slowly produce oxygen, replenishing the oxygen in the chamber 10. The calcium hydroxide produced by the reaction can also be used to adsorb carbon dioxide. Furthermore, after the steam molecules in the oxygen flow entering the chamber 10 react with the calcium peroxide, the density of the oxygen flow increases, causing it to sink, facilitating oxygen inhalation by the live shrimp in the storage space 100.

[0053] Furthermore, the inner top surface of the container 1 is provided with a second adsorbent layer 3 for adsorbing carbon dioxide and a non-woven fabric layer 4 for covering the second adsorbent layer 3. The second adsorbent layer 3 includes a second adsorbent 31 for adsorbing carbon dioxide, which comprises calcium hydroxide. The second adsorbent layer 3, disposed at the top of the cavity 10, cooperates with the first adsorbent layer 22 of the partition wall 2 to form a comprehensive, multi-layered carbon dioxide absorption system, thereby improving the adsorption efficiency of carbon dioxide. Furthermore, by providing the second adsorbent layer 3 at the top, the carbon dioxide gas in the cavity 10 tends to flow upward, which helps to prevent the carbon dioxide generated by the breathing of the live shrimp from being deposited in the lower part. At the same time, after the steam molecules in the oxygen flow filled into the cavity 10 react with the calcium peroxide, the density of the oxygen flow increases and tends to sink. The sinking oxygen flow disturbs the carbon dioxide flow to flow upward, thereby forming an airflow movement pattern in the cavity 10 in which the oxygen flow tends to sink and the carbon dioxide tends to float upward, increasing the oxygen concentration and reducing the carbon dioxide concentration at the location of the live shrimp, which is beneficial to improving the survival rate of the live shrimp and at the same time improving the adsorption efficiency of carbon dioxide by the first adsorbent layer 22 and the second adsorbent layer 3.

[0054] Further, if Figure 1 、 Figure 2 、 Figure 3 as well as Figure 5 As shown, the non-woven fabric layer 4 is constructed into a concave-convex structure with hemispherical convex bumps 41 arranged at intervals, and the above-mentioned second adsorbent 31 is respectively filled in each hemispherical convex bump 41. The design of the concave-convex structure can make the concentration of carbon dioxide gas at the top of the cavity 10 have a high and low distribution (the carbon dioxide concentration at each hemispherical convex bump 41 is lower than the carbon dioxide concentration in the depression between adjacent hemispherical convex bumps 41), thereby increasing the flow rate of the carbon dioxide gas flow and further improving the adsorption efficiency of carbon dioxide. In this embodiment, each hemispherical convex bump 41 on the non-woven fabric layer 4 is sewn by non-woven fabric, and the non-woven fabric layer 4 is detachably arranged on the inner top surface of the container 1 by Velcro 9.

[0055] Further, the support plate 21 is a plant fiber board, which is composed of a composite of rice husk and coconut shell, and the mass ratio of rice husk and coconut shell is 2:3. Plant fiber board is a natural environmentally friendly material, which can avoid pollution to the environment, and can restore its adsorption function in an appropriate manner after use to achieve recycling. The plant fiber board in the present invention is specifically composed of a composite of rice husk and coconut shell in a mass ratio of 2:3, wherein the rice husk fiber board has high hardness, high rigidity, and excellent compressive and flexural strength, and the coconut shell fiber board has excellent toughness, impact resistance and elasticity, so the plant fiber board composited by the two is both strong and not easy to break, and the structure is stable and not easy to deform, and can well achieve the supporting effect, realize the skeleton function in the partition wall 2, and can further expand the surface area, provide more adsorption sites for the adsorption of carbon dioxide molecules, and enhance the physical adsorption effect on carbon dioxide molecules. It can be seen that the composite of rice husk and coconut shell in the present invention is not only a physical mixing superposition, but also a chemical synergy in performance.

[0056] Furthermore, the breathable and waterproof membrane 23 is specifically a PU membrane. The PU membrane has the advantages of high elasticity, flexibility, tear resistance, and wear resistance. It can well cover the first adsorbent layer 22 on the outer surface of the support plate 21, and is safe and environmentally friendly, ensuring the edible safety of shrimps. Moreover, the PU membrane has good air permeability and waterproof properties. In addition, in this embodiment, a second water-retaining cotton layer 5 is provided on the inner circumference of the container 1, so as to better maintain the humidity inside the container 1 during the transportation of live shrimps. In this embodiment, specifically, the second water-retaining cotton layer 5 is detachably provided on the inner circumference of the container 1 by Velcro 9, as shown in FIG. Figure 1 、 Figure 2 as well as Figure 3 shown.

[0057] Furthermore, there are at least two containers 1, each of which is stacked up and down and adjacent containers 1 are detachably connected, and a cover 6 is detachably mounted on the top of the container 1, and a handle 61 is provided on the cover 6 for carrying. This facilitates the assembly and disassembly of the device, and the number of containers 1 can be flexibly adjusted according to the number of live shrimps to be transported (in this embodiment, there are three containers 1), and the cover 6 with a handle 61 is designed to facilitate the carrying of the device, which is conducive to improving transportation efficiency. In this embodiment, specifically, Figure 1 As shown, the upper and lower adjacent containers 1 are connected by snaps 10 , and the cover 6 and the corresponding container 1 are also connected by snaps 10 .

[0058] The transportation method of fresh and alive shrimps in the present embodiment is as follows:

[0059] The caught live shrimp were temporarily raised in seawater at 21℃~23℃ (salinity of 35‰, dissolved oxygen>5mg / L) without feeding, and oxygen was continuously supplied during the raising period.

[0060] After 2 hours of temporary storage, the shrimp are removed, and dead and less active shrimp are discarded. The shrimp are then immersed in seawater pre-cooled to 13°C for 3 minutes until the shrimp enter a dormant state of suspended animation. Next, the dormant shrimp are quickly removed, drained, and evenly placed into each container 1 of the above-mentioned device, ensuring that they are evenly distributed within each accommodating space 100 (to prevent the shrimp from overlapping within each accommodating space 100).

[0061] After assembly, open each air inlet valve 7 to fill oxygen into the cavity 10 of each container 1, so that the initial oxygen concentration in the cavity 10 of each container 1 is 99%, the initial air humidity is 60% to 65%, and the initial temperature is 20°C to 25°C.

[0062] During transportation, the internal temperature of each container 1 is controlled at 10°C to 20°C (preferably 15°C). After arriving at the destination, the shrimps are transferred to clean water at 18°C and kept ventilated or oxygenated (the transportation time does not exceed 20 hours). The shrimps gradually recover in about 5 minutes.

[0063] Transport effect test:

[0064] Experimental subjects: Fresh whiteleg shrimp, purchased from Nanning farmers' market, with a single weight of 15±2g / prawn and a body length of 14±1cm, were divided into experimental group, control group, comparison group 1 and comparison group 2.

[0065] Main test instruments: Oxygen pump (Green One Pump Industry): used to maintain dissolved oxygen in the environment during the temporary storage stage; oxygen tank (Rui Da Chemical Technology Co., Ltd.): used for oxygenation during the oxygenation and packaging stage; GT1000-CO2-CL-1 carbon dioxide detector (Shenzhen Kerno Electronic Technology Co., Ltd.): used to detect carbon dioxide concentration and humidity; i-STAT Abbott handheld 300G blood gas analyzer (Abbott, USA): used to measure HCO3 in the blood - Content, pCO2, TCO2 detection.

[0066] Experimental group:

[0067] The live shrimp transport device in the embodiment was used, and the shrimp were placed in an incubator at 15° C. for 12 hours to simulate dry transport according to the transport method in the embodiment.

[0068] During the experiment, relevant indicators such as carbon dioxide content, humidity, survival rate of whiteleg shrimp, and carbon dioxide in the blood of whiteleg shrimp in each container were tested every 4 hours.

[0069] Control group:

[0070] The existing ordinary aquatic product waterless transport box was used to replace the fresh shrimp transport device in the experimental group, and other experimental conditions were the same as those of the experimental group.

[0071] Comparison Group 1:

[0072] The live shrimp transport device of the embodiment was used. Except for the addition of dry oxygen during the oxygen filling and packaging stage, other experimental conditions were the same as those of the experimental group.

[0073] Comparison Group 2:

[0074] Except that the second adsorbent layer on the inner top surface of each container was not set as a concave-convex structure (specifically, it was set as a flat structure, that is, the second adsorbent was spread flat on the inner top surface of the container through non-woven fabric), other experimental conditions were the same as those of the experimental group.

[0075] Test results:

[0076] The experimental and control group test results are as follows Figures 6 to 11 As shown by Figures 6 to 8 It can be seen that the carbon dioxide content of the control group reached 14.7% within 12 hours, while the carbon dioxide content of the experimental group remained at 0% (e.g. Figure 6 The humidity in the control group dropped significantly faster than that in the experimental group, and after 12 hours, the humidity in the device was lower than that in the experimental group (as shown in Figure 7 The survival rate of the whiteleg shrimp in the control group dropped to 85% after 12 hours, while the survival rate of the whiteleg shrimp in the experimental group was as high as 93.7% (as shown in Figure 2). Figure 8 As shown). It can be seen that the fresh shrimp transportation device of the present invention can greatly improve the waterless transportation environment of whiteleg shrimp and increase its survival rate.

[0077] Depend on Figures 9 to 11 It can be seen that the blood HCO3- content of the control group gradually decreased over time, indicating that the blood acidified due to CO2 accumulation during shrimp transportation, and HCO3- was consumed to buffer the pH, while the experimental group remained stable, indicating that the fresh shrimp transportation device of the present invention can effectively reduce CO2 accumulation and avoid excessive consumption of HCO3- (such as Figure 9 The CO2 partial pressure in the control group continued to rise, reflecting that CO2 could not be discharged in the sealed environment, resulting in CO2 accumulation in the shrimp blood, while the CO2 partial pressure in the experimental group was basically stable, which shows that the present invention can remove CO2 in time and reduce the respiratory burden of the shrimp (as shown in the figure). Figure 10 The total CO2 content in the blood of the control group increased significantly, indicating that CO2 in the shrimp body could not be effectively discharged, which may cause acidosis. The total CO2 content in the blood of the experimental group remained at a low level, indicating that the present invention improved the transportation environment and reduced the physiological stress of CO2 on shrimp (such as Figure 11 As shown in the figure). The above experimental data show that the experimental group using the fresh shrimp transport device of the present invention significantly reduced the accumulation of CO2 during transportation, avoided the risk of shrimp blood pH imbalance and acidosis, thereby maintaining the physiological stability of the shrimp and improving the survival rate and health status of the shrimp during waterless transportation.

[0078] Comparison of the experimental results of Group 1 Figure 12 and Figure 13 As shown by Figure 12 It can be seen that the overall humidity of the comparison group 1 is lower than that of the experimental group. Its initial humidity is 50%, which is lower than the 63% of the experimental group. The humidity of the control group decreases faster than that of the experimental group. Figure 13 It can be seen that the survival rate of the whiteleg shrimp in the comparison group 1 dropped to 88.8% after 12 hours, while the survival rate of the whiteleg shrimp in the experimental group was as high as 93.7%. The experimental data show that the present invention can significantly improve the waterless transportation environment of whiteleg shrimp and increase its survival rate by introducing oxygen with a certain humidity (humidity of 9%-13%).

[0079] The results of the comparison group 2 are as follows Figure 14 and Figure 15 As shown by Figure 14 It can be seen that the carbon dioxide content in the comparison group 2 reached 4.1% within 12 hours, while the carbon dioxide content in the experimental group remained at 0% under the action of the carbon dioxide absorber. Figure 15 The survival rate of the whiteleg shrimp in the comparison group 2 dropped to 88.8% after 12 hours, while the survival rate of the whiteleg shrimp in the experimental group was as high as 93.7%. The experimental data show that the concave-convex structure of the second adsorbent layer using the nonwoven fabric in the present invention significantly increases the CO2 adsorption rate. The lower CO2 concentration in the environment maintains the physiological stability of the shrimp, which is beneficial for improving the survival rate of whiteleg shrimp during waterless transportation.

Claims

1. A fresh shrimp transport device, characterized in that: The invention comprises a square container, the interior of which is hollow to form a cavity, a side wall of which is provided with an openable and closable air inlet for filling the cavity with oxygen, a vertical partition wall is provided in the cavity to separate a space for placing live shrimps in the cavity, and the height of the partition wall is lower than the height of the cavity, and a vent for gas circulation is formed above the partition wall. The partition wall includes, from the inside to the outside, a support plate with a certain hardness and a porous structure, a first adsorbent layer for adsorbing carbon dioxide, a breathable and waterproof membrane, and a first water-retaining cotton layer. The first adsorbent layer is covered with the breathable and waterproof membrane and attached to the outer surface of the support plate, while the first water-retaining cotton layer is covered outside the breathable and waterproof membrane.

2. The live shrimp transport device according to claim 1, characterized in that: The oxygen filled into the cavity through the air inlet is oxygen with a certain humidity.

3. The live shrimp transport device according to claim 2, characterized in that: The first adsorbent layer includes a first adsorbent for adsorbing carbon dioxide, wherein the first adsorbent includes soda lime, silica and calcium peroxide, and the mass fractions of each component are: 60-75 parts of soda lime, 15-25 parts of silica, and 10-15 parts of calcium peroxide.

4. The live shrimp transport device according to claim 3, characterized in that: A second adsorbent layer for adsorbing carbon dioxide and a non-woven fabric layer for covering the second adsorbent layer on the inner top surface of the container are respectively provided on the inner top surface of the container, wherein the second adsorbent layer includes a second adsorbent for adsorbing carbon dioxide, and the second adsorbent includes calcium hydroxide.

5. The live shrimp transport device according to claim 4, characterized in that: The non-woven fabric layer is constructed into a concave-convex structure with hemispherical convex hulls arranged at intervals, and the second adsorbent is filled in each hemispherical convex hull respectively.

6. The live shrimp transport device according to claim 1, characterized in that: The support board is a plant fiber board, which is composited from rice husks and coconut shells, and the mass ratio of rice husks to coconut shells is 2:

3.

7. The live shrimp transport device according to claim 1, characterized in that: The breathable and waterproof membrane is a PU membrane.

8. The live shrimp transport device according to claim 1, characterized in that: A second water-retaining cotton layer is provided on the inner surface of the container.

9. The live shrimp transport device according to any one of claims 1 to 8, characterized in that: There are at least two containers, each container is stacked up and down and adjacent containers are detachably connected, and a cover is detachably installed on the top of the container at the top, and a handle for carrying is provided on the cover.

10. A method for transporting live shrimp using the fresh shrimp transport device according to any one of claims 1 to 9, characterized in that The following steps are involved: (1) Temporary culture: Fresh shrimp were temporarily cultured in a water environment with a water temperature of 20℃ to 25℃, a salinity of 35‰, and a dissolved oxygen level of >5mg / L, with continuous oxygenation and no feeding; (2) Cold shock: After 2 hours of temporary storage, the shrimps were taken out and placed in 12℃-15℃ water for 3 minutes to cold shock until all the shrimps entered a dormant state of suspended animation; (3) Oxygen-filled packaging: The dormant shrimps are removed and drained, and are placed in the respective accommodating spaces of the above-mentioned fresh shrimp transport device. Oxygen with a certain humidity is introduced through the air inlet. The initial oxygen concentration of each container is 99%, the initial air humidity is 60% to 65%, and the initial temperature is 20° C. to 25° C.; (4) Transportation: The transportation temperature inside each container should be controlled at 10°C to 20°C, and the transportation time should not exceed 20 hours; (5) Recovery: Take out the dormant shrimp and put them into water at room temperature to recover.

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