A sorting device and sorting method for eel fry

Abstract

This invention discloses an eel fry sorting device and method, aiming to provide an eel fry sorting device and method that can effectively solve the problems of existing manual eel fry sorting methods, which easily lead to eel fry injury, oxygen deficiency, and reduced eel fry survival rate due to the impact on the quality of the temporary holding water. An eel fry sorting device includes: a sorting tank with a first outlet at the bottom and an isolation net at the first outlet; an eel fry temporary holding chamber with a second outlet at the bottom and an isolation net at the second outlet; an inclined top-flow sorting channel, the lower end of which is connected to the bottom of the sorting tank and the upper end of which is connected to an inlet channel; and an inclined suction channel, the upper end of which is connected to the top of the top-flow sorting channel and the lower end of which is connected to the top of the eel fry temporary holding chamber, wherein the flow velocity in the suction channel is greater than the flow velocity in the top-flow sorting channel.

Description

Technical Field

[0001] This invention relates to the field of eel fry sorting, and specifically to an eel fry sorting device and sorting method. Background Technology

[0002] Currently, after the eel larvae are caught in the gillnet, fishermen first scoop the gillnet out of the water and then remove the eel larvae collector from it, thus completing the eel larvae harvesting process. Because the mesh of the gillnet is very small, and the collector is installed against the current at the rear of the gillnet, the eel larvae and sandworms actively swim or crawl into it, while the fine mud and sand are deposited from the turbid water flowing in. Therefore, the "catch" in the eel larvae collector mainly includes eel larvae, sandworms, and fine mud and sand.

[0003] Since the "catch" in the eel fry collector includes eel fry, sandworms, and fine mud, sorting of the eel fry is necessary. Current eel fry sorting methods generally employ the following manual sorting: the "catch" from the eel fry collector is poured into a sorting net; then, the fine mud is rinsed away with water; next, sandworms are removed using a plastic fork, small twig, or fingers; finally, the remaining eel fry in the sorting net are transferred to a bucket for temporary rearing by stirring, picking, or hand-grabbing. This current manual eel fry sorting method has the following shortcomings.

[0004] Firstly, the sorting method is simple and rough, which can easily cause injury to the eel larvae and affect their survival rate.

[0005] Secondly, during the sorting process, the eel larvae are exposed to the air, which can easily cause oxygen deficiency and affect their survival rate.

[0006] Third, the mud and sand on the eel fry affect the water quality during temporary rearing, thus affecting the survival rate of the eel fry. Summary of the Invention

[0007] The purpose of this invention is to provide an eel fry sorting device and sorting method, which can effectively solve the problems of manual eel fry sorting in the prior art, which easily leads to eel fry injury, hypoxia and affects the quality of temporary holding water, thus reducing the survival rate of eel fry.

[0008] The technical solution of this invention is:

[0009] An eel fry sorting device includes:

[0010] The sorting water tank has a first water outlet at the bottom, and an isolation net is installed at the first water outlet.

[0011] The eel larvae rearing chamber has a second water outlet at the bottom, and an isolation net is installed at the second water outlet.

[0012] The inclined top-flow sorting channel is connected at its lower end to the bottom of the sorting water tank and at its upper end to the water inlet channel.

[0013] The inclined suction channel is connected at its upper end to the top of the top-flow sorting channel and at its lower end to the top of the eel larvae rearing chamber. The flow velocity in the suction channel is greater than that in the top-flow sorting channel. The specific sorting process of one eel larvae sorting device according to this scheme is as follows:

[0014] The catch to be sorted, including eel larvae, sandworms, and mud, is placed in a sorting tank. Water flows through the inlet channel into the top-current sorting channel. A portion of the water in the top-current sorting channel flows down into the sorting tank and out through the first outlet; another portion flows through the suction channel into the eel larvae rearing chamber and out through the second outlet. During this process, sandworms and mud remain in the sorting tank (sandworms are invertebrate benthic animals that prefer to inhabit the sand and mud at the bottom of the water. They are weak swimmers and do not swim against the current, therefore they remain in the sorting tank); eel larvae are stronger swimmers and swim against the current, therefore they are sorted... When the eel larvae in the tank are stimulated by the water flow, they will swim upwards along the top sorting channel. When the eel larvae swim to the top of the top sorting channel and approach the upper end of the suction channel, they will be sucked into the suction channel by the water flow and enter the eel larvae temporary rearing chamber. This achieves automatic sorting of eel larvae without causing injury or lack of oxygen, and can effectively improve the survival rate of eel larvae. Therefore, it can effectively solve the problem that the manual sorting method of eel larvae in the existing technology is prone to causing injury and lack of oxygen to eel larvae and affecting the quality of the temporary rearing water, thus reducing the survival rate of eel larvae.

[0015] On the other hand, since the flow velocity in the intake channel is greater than that in the top-flow sorting channel, the eel fry that enter the eel fry rearing chamber cannot go against the flow of water in the intake channel to enter the top-flow sorting channel even under the drive of the top flow. They can only swim in the eel fry rearing chamber.

[0016] Preferably, the flow velocity in the inlet channel is greater than that in the suction channel. This prevents eel fry moving upstream along the top current sorting channel from entering the inlet channel, and instead allows eel fry moving upstream along the top current sorting channel to be sucked into the suction channel and into the eel fry holding chamber.

[0017] Preferably, the cross-sectional area of ​​the top-flow sorting channel is larger than that of the suction channel. This allows the flow velocity in the suction channel to be higher than that in the top-flow sorting channel.

[0018] Preferably, the water inlet channel includes an inclined water inlet channel, the inclination angle of which is the same as that of the top-flow sorting channel, and the lower end of the inclined water inlet channel is connected to the upper end of the top-flow sorting channel. In this way, the water flowing into the top-flow sorting channel through the inclined water inlet channel is conducive to forming a downward flow along the top-flow sorting channel.

[0019] Preferably, the inlet channel also includes a horizontal inlet channel, with the upper end of the inclined inlet channel connected to one end of the horizontal inlet channel. The other end of the horizontal inlet channel is a water inlet connected to an inlet pipe. Thus, the guidance of the horizontal and inclined inlet channels facilitates a uniform and gentle flow of water into the top-flow sorting channel, creating a uniform and gentle water flow within the top-flow sorting channel. This, in turn, helps the eel fry move upstream along the top-flow sorting channel.

[0020] Preferably, the lower end of the inclined inlet channel and the upper end of the suction channel are located on opposite sides of the upper end of the top-current sorting channel. In this way, after the eel fry swims up the top of the top-current sorting channel, it is easier for the eel fry to be sucked into the suction channel.

[0021] Preferably, a DC electric field device is also included, comprising an anode element and a cathode element, wherein the cathode element is distributed within the sorting tank and the anode element is distributed within the eel larvae rearing chamber. This scheme utilizes the phototaxis characteristic of eel larvae. During the eel larvae sorting process, a DC current of less than 36V is applied between the anode and cathode elements, thereby creating a DC electric field of a certain intensity in the water within the sorting tank and the eel larvae rearing chamber. Stimulated by the DC electric field, the eel larvae will turn their bodies towards the anode and swim towards it, thus facilitating their entry into the eel larvae rearing chamber through the suction channel and preventing eel larvae in the rearing chamber from escaping through the suction channel.

[0022] Preferably, the bottom of the eel larvae rearing chamber is equipped with a conical inlet, and the lower end of the conical inlet is equipped with a discharge pipe, the lower end of which is equipped with a removable sealing cap. In this way, after the eel larvae are sorted, a rearing box can be placed below the discharge pipe, and then the sealing cap can be opened to discharge the eel larvae and water from the eel larvae rearing chamber into the rearing box.

[0023] Preferably, the second outlet is located on the side wall of the discharge pipe, the first outlet is connected to the first drainage pipe, and the second outlet is connected to the second drainage pipe.

[0024] A sorting method using an eel fry sorting device includes the following steps in sequence:

[0025] The catch to be sorted is placed in a sorting tank. The catch includes eel larvae, sandworms, and mud.

[0026] Water flows into the top-flow sorting channel through the inlet channel. A portion of the water in the top-flow sorting channel flows down into the sorting tank and out through the first outlet. Another portion of the water in the top-flow sorting channel flows into the eel larvae rearing chamber through the suction channel and out through the second outlet. During this process, taking advantage of the eel larvae's tendency to swim upstream, the eel larvae in the sorting tank will be stimulated by the water flow and will swim upward along the top-flow sorting channel. When the eel larvae swim to the top of the top-flow sorting channel and approach the upper end of the suction channel, they will be sucked into the suction channel and enter the eel larvae rearing chamber under the action of the water flow in the suction channel. Sandworms and mud remain in the sorting tank. In this way, the eel fry can be automatically sorted without causing injury or lack of oxygen, thus effectively improving the survival rate of the eel fry. Therefore, it can effectively solve the problem that the manual sorting method of eel fry in the existing technology is prone to causing injury and lack of oxygen to the eel fry and affecting the quality of the temporary holding water, thereby reducing the survival rate of the eel fry.

[0027] The beneficial effects of this invention are: it can realize the automatic sorting of eel fry without causing problems such as injury or lack of oxygen to the eel fry, and can effectively improve the survival rate of eel fry; thus, it can effectively solve the problem that the manual sorting method of eel fry in the prior art is prone to causing injury and lack of oxygen to the eel fry and affecting the quality of the temporary holding water, thereby reducing the survival rate of eel fry. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an eel fry sorting device according to the present invention.

[0029] In the picture:

[0030] Sorting tank 1, first outlet 1.1;

[0031] 2. Eel larvae temporary rearing chamber; 2.1. Conical guide port; 2.2. Discharge pipe; 2.3. Sealing end cap;

[0032] Top-flow sorting channel 3;

[0033] Water inlet channel 4, water inlet inclined channel 4.1, water inlet horizontal channel 4.2;

[0034] Inhalation channel 5;

[0035] Water inlet pipe 6;

[0036] First drainage pipe 7;

[0037] Second drainage pipe 8;

[0038] Anode element 9.1, cathode element 9.2. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0040] Specific Implementation Example 1, such as Figure 1 As shown, an eel fry sorting device includes a sorting tank 1, an eel fry holding chamber 2, a top-flow sorting channel 3, and a suction channel 5. The sorting tank 1 has a first outlet 1.1 at its bottom. A mesh screen is installed at the first outlet 1.1. The eel fry holding chamber 2 has a second outlet at its bottom. A mesh screen is installed at the second outlet. The top-flow sorting channel 3 is arranged at an angle. The lower end of the top-flow sorting channel 3 is connected to the bottom of the sorting tank 1, and the upper end of the top-flow sorting channel 3 is connected to an inlet channel 4. The suction channel 5 is also arranged at an angle. The upper end of the suction channel 5 is connected to the top of the top-flow sorting channel 3, and the lower end of the suction channel 5 is connected to the top of the eel fry holding chamber 2. The flow velocity in the suction channel 5 is greater than the flow velocity in the top-flow sorting channel 3.

[0041] The specific sorting process of the eel fry sorting device in this embodiment is as follows:

[0042] The catch to be sorted, including eel larvae, sandworms, and mud, is placed in sorting tank 1. Water flows through inlet channel 4 into top-current sorting channel 3. A portion of the water in top-current sorting channel 3 flows down into sorting tank 1 and out through the first outlet 1.1; another portion of the water in top-current sorting channel 3 flows through suction channel 5 into eel larvae rearing chamber 2 and out through the second outlet. During this process, sandworms and mud remain in sorting tank 1 (sandworms are invertebrate benthic animals that prefer to inhabit the sand and mud at the bottom of the water. They have weak swimming ability and do not swim against the current, therefore, sandworms and mud will remain in sorting tank 1); eel larvae have stronger swimming ability and swim against the current, therefore... When the eel fry in the sorting tank 1 are stimulated by the water flow, they will swim upwards along the top sorting channel 3. When the eel fry swim to the top of the top sorting channel 3 and approach the upper end of the suction channel 5, they will be sucked into the suction channel 5 by the water flow and enter the eel fry temporary rearing chamber 2. This achieves automatic sorting of eel fry without causing injury or lack of oxygen to the eel fry, and can effectively improve the survival rate of eel fry. Therefore, it can effectively solve the problem that the manual sorting method of eel fry in the existing technology is prone to causing injury and lack of oxygen to eel fry and affecting the quality of the temporary rearing water, thus reducing the survival rate of eel fry.

[0043] On the other hand, since the flow velocity in the suction channel 5 is greater than that in the top-flow sorting channel 3, the eel fry that enter the eel fry temporary rearing chamber 2 cannot enter the top-flow sorting channel 3 against the flow of water in the suction channel 5, even if the eel fry are driven by the top flow, and can only swim in the eel fry temporary rearing chamber 2.

[0044] Specifically, such as Figure 1As shown, an eel fry sorting device further includes a sorting box with an open top. A sorting trough 1, an eel fry holding chamber 2, a top-flow sorting channel 3, and a suction channel 5 are all arranged inside the sorting box. In this embodiment, the top-flow sorting channel 3 and the eel fry holding chamber 2 are located on the same side of the sorting trough 1, and the top-flow sorting channel 3 is located between the eel fry holding chamber 2 and the sorting trough 1.

[0045] The first outlet 1.1 is located at the bottom of the side wall of the sorting tank 1. The lower end of the top flow sorting channel 3 is connected to the bottom of the side wall of the sorting tank 1. The upper end of the suction channel 5 is connected to the top of the side wall of the top flow sorting channel 3.

[0046] The first outlet 1.1 is connected to the first drainage pipe 7, and the first drainage pipe 7 is equipped with a first valve, which is located near the first outlet 1.1. The first valve controls the opening and closing of the first outlet 1.1 and the water flow rate.

[0047] The second outlet is also connected to the second drainage pipe 8, which is equipped with a second valve located near the second outlet. The second valve controls the opening and closing of the second outlet and the water flow rate.

[0048] The cross-sectional area of ​​the top-flow sorting channel 3 is larger than that of the suction channel 5, so that the flow velocity in the suction channel 5 is greater than that in the top-flow sorting channel 3. In this embodiment, the cross-sectional area of ​​the top-flow sorting channel 3 is more than three times larger than that of the suction channel 5, so that the flow velocity in the suction channel 5 is much greater than that in the top-flow sorting channel 3.

[0049] Furthermore, the flow velocity in the inlet channel 4 is greater than the flow velocity in the suction channel 5. This prevents eel fry moving upstream along the top current sorting channel 3 from entering the inlet channel 4, and instead allows eel fry moving upstream along the top current sorting channel 3 to be sucked into the suction channel 5 and into the eel fry temporary rearing chamber 2.

[0050] Furthermore, such as Figure 1 As shown, the water inlet channel 4 includes an inclined water inlet channel 4.1, the inclination angle of which is the same as that of the top-flow sorting channel 3, and the lower end of the inclined water inlet channel 4.1 is connected to the upper end of the top-flow sorting channel 3. In this way, the water flowing into the top-flow sorting channel 3 through the inclined water inlet channel 4.1 is conducive to forming a downward flow of water along the top-flow sorting channel 3.

[0051] The inlet channel 4 also includes a horizontal inlet channel 4.2. The upper end of the inclined inlet channel 4.1 is connected to one end of the horizontal inlet channel 4.2. The other end of the horizontal inlet channel 4.2 is a water inlet. This water inlet is connected to the inlet pipe 6. Thus, through the guidance of the horizontal inlet channel 4.2 and the inclined inlet channel 4.1, the water flow is facilitated to flow evenly and gently into the top-current sorting channel 3, forming a uniform and gentle water flow in the top-current sorting channel 3, which in turn facilitates the eel fry to swim upwards along the top-current sorting channel 3.

[0052] Furthermore, such as Figure 1 As shown, the lower end of the inclined inlet channel 4.1 and the upper end of the suction channel 5 are located on opposite sides of the upper end of the top-current sorting channel 3. In this way, after the eel fry swims up along the top-current sorting channel 3 to the top of the top-current sorting channel 3, it is beneficial for the eel fry to be sucked into the suction channel 5.

[0053] Furthermore, such as Figure 1 As shown, the bottom of the eel fry rearing chamber 2 is provided with a conical guide port 2.1, and the inner diameter of the conical guide port 2.1 gradually decreases from top to bottom. A discharge pipe 2.2 is provided at the lower end of the conical guide port 2.1. A detachable sealing end cap 2.3 is provided at the lower end of the discharge pipe 2.2. Thus, after the eel fry sorting is completed, a rearing box can be placed below the discharge pipe, and then the sealing end cap can be opened to discharge the eel fry and water from the eel fry rearing chamber 2 into the rearing box. In this embodiment, the second outlet is located on the side wall of the discharge pipe. However, it should be noted that the second outlet can also be located separately on the bottom wall or the bottom of the side wall of the eel fry rearing chamber 2.

[0054] Specific embodiment two: a sorting method using an eel fry sorting device, wherein the specific structure of the eel fry sorting device in this sorting method is as described in specific embodiment one.

[0055] A sorting method using an eel fry sorting device includes the following steps in sequence:

[0056] The catch to be sorted is placed in sorting tank 1. The catch includes eel larvae, sandworms and mud.

[0057] Water flows into the top sorting channel 3 through the water inlet channel 4. Specifically, external water flows into the water inlet channel 4 through the water inlet pipe 6, and the water in the water inlet channel 4 flows into the top sorting channel 3.

[0058] A portion of the water in the top-flow sorting channel 3 flows down into the sorting tank 1 and out through the first outlet 1.1; another portion of the water in the top-flow sorting channel 3 flows into the eel fry rearing chamber 2 through the suction channel 5 and out through the second outlet, thus forming a suction water flow zone at the top of the top-flow sorting channel 3 that flows towards the suction channel 5. During this process, utilizing the eel fry's tendency to flow upwards, the eel fry in the sorting tank 1, stimulated by the water flow, will swim upwards along the top-flow sorting channel 3. When the eel fry swim to the top of the top-flow sorting channel 3 and approach the upper end of the suction channel 5—specifically, when the eel fry swim to the suction water flow zone at the top of the top-flow sorting channel 3—they will be sucked into the suction channel 5 and enter the eel fry rearing chamber 2 under the action of the water flow in the suction channel 5.

[0059] Sandworms are invertebrate benthic animals that prefer to inhabit sandy or muddy bottoms. They have weak swimming abilities and do not swim against the current, so the sandworms and mud will remain in the sorting tank 1. This achieves automatic sorting of eel larvae without causing injury or oxygen deprivation, effectively improving their survival rate. Therefore, it effectively solves the problems of manual sorting methods in existing technologies, which easily lead to injury, oxygen deprivation, and negative impacts on the quality of the temporary holding water, thus reducing the survival rate of eel larvae.

[0060] Specific embodiment three, such as Figure 1 As shown, an eel fry sorting device includes a sorting tank 1, an eel fry temporary rearing chamber 2, a top-flow sorting channel 3, a suction channel 5, and a DC electric field device.

[0061] The bottom of the sorting tank 1 is provided with a first water outlet 1.1. An isolation net is provided at the first water outlet 1.1. In this embodiment, the first water outlet 1.1 is located at the bottom of the side wall of the sorting tank 1.

[0062] The bottom of the eel larvae rearing chamber 2 is equipped with a second water outlet. An isolation net is installed at the second water outlet.

[0063] The top-flow sorting channel 3 is arranged at an angle. The lower end of the top-flow sorting channel 3 is connected to the bottom of the side wall of the sorting tank 1, and the upper end of the top-flow sorting channel 3 is connected to the inlet channel 4.

[0064] The suction channel 5 is arranged at an angle. The upper end of the suction channel 5 is connected to the top of the side wall of the top flow sorting channel 3, and the lower end of the suction channel 5 is connected to the top of the eel larvae temporary rearing chamber 2.

[0065] The flow velocity in the suction channel 5 is greater than the flow velocity in the top-flow sorting channel 3. The cross-sectional area of ​​the top-flow sorting channel 3 is greater than the cross-sectional area of ​​the suction channel 5, so that the flow velocity in the suction channel 5 is greater than the flow velocity in the top-flow sorting channel 3. In this embodiment, the cross-sectional area of ​​the top-flow sorting channel 3 is more than three times greater than the cross-sectional area of ​​the suction channel 5, so that the flow velocity in the suction channel 5 is much greater than the flow velocity in the top-flow sorting channel 3.

[0066] The DC electric field device includes an anode element 9.1 and a cathode element 9.2, wherein the cathode element is distributed in the sorting tank 1 and the anode element is distributed in the eel fry temporary rearing chamber 2.

[0067] The specific sorting process of the eel fry sorting device in this embodiment is as follows:

[0068] The catch to be sorted is placed in sorting tank 1. The catch includes eel larvae, sandworms and mud.

[0069] Taking advantage of the phytotropic properties of eel fry, a direct current of less than 36V is applied between the anode and cathode elements during the fry sorting process, thereby creating a direct current electric field of a certain intensity in the water of the sorting tank 1 and the eel fry temporary rearing chamber 2.

[0070] Water flows into the top-flow sorting channel 3 through the inlet channel 4. A portion of the water in the top-flow sorting channel 3 flows downwards into the sorting tank 1 and exits through the first outlet 1.1. Another portion of the water in the top-flow sorting channel 3 flows into the eel larvae rearing chamber 2 through the suction channel 5 and exits through the second outlet. During this process, sandworms and sediment remain in the sorting tank 1 (sandworms are invertebrate benthic animals that prefer to inhabit the sand and mud at the bottom of the water. They have weak swimming ability and no tendency to swim against the current, therefore, sandworms and sediment will remain in the sorting tank 1). Eel larvae have stronger swimming ability and exhibit characteristics of swimming against the current and phototropism. Therefore, after being stimulated by the water flow, the eel larvae in the sorting tank 1 will swim upwards along the top-flow sorting channel 3. When the eel larvae swim to the top of the top-flow sorting channel 3 and approach the upper end of the suction channel 5, they will be sucked into the suction channel 5 by the water flow and enter the eel larvae's body. Temporary rearing chamber 2; simultaneously, after being stimulated by the direct current electric field, the eel larvae will turn their bodies towards the anode and swim towards it, which facilitates the eel larvae entering the eel larvae temporary rearing chamber 2 through the suction channel 5, and helps prevent the eel larvae in the temporary rearing chamber 2 from escaping through the suction channel 5; thus, the eel larvae are automatically sorted, and there is no problem of eel larvae injury or lack of oxygen, which can effectively improve the survival rate of eel larvae. Therefore, it can effectively solve the problem that the existing manual sorting method of eel larvae is prone to causing eel larvae injury, lack of oxygen and affecting the temporary rearing water quality, thus reducing the survival rate of eel larvae.

[0071] On the other hand, since the flow velocity in the suction channel 5 is much greater than that in the top-flow sorting channel 3, the eel fry that enter the eel fry temporary rearing chamber 2 cannot go against the water flow in the suction channel 5 to enter the top-flow sorting channel 3 even under the drive of the top flow. They can only swim in the eel fry temporary rearing chamber 2.

[0072] Specifically, such as Figure 1As shown, an eel fry sorting device further includes a sorting box with an open top. A sorting trough 1, an eel fry holding chamber 2, a top-flow sorting channel 3, and a suction channel 5 are all arranged inside the sorting box. In this embodiment, the top-flow sorting channel 3 and the eel fry holding chamber 2 are located on the same side of the sorting trough 1, and the top-flow sorting channel 3 is located between the eel fry holding chamber 2 and the sorting trough 1.

[0073] The first outlet 1.1 is connected to the first drainage pipe 7, and the first drainage pipe 7 is equipped with a first valve, which is located near the first outlet 1.1. The first valve controls the opening and closing of the first outlet 1.1 and the water flow rate.

[0074] The second outlet is also connected to the second drainage pipe 8, which is equipped with a second valve located near the second outlet. The second valve controls the opening and closing of the second outlet and the water flow rate.

[0075] Furthermore, the flow velocity in the inlet channel 4 is greater than the flow velocity in the suction channel 5. This prevents eel fry moving upstream along the top current sorting channel 3 from entering the inlet channel 4, and instead allows eel fry moving upstream along the top current sorting channel 3 to be sucked into the suction channel 5 and into the eel fry temporary rearing chamber 2.

[0076] Furthermore, such as Figure 1 As shown, the water inlet channel 4 includes an inclined water inlet channel 4.1, the inclination angle of which is the same as that of the top-flow sorting channel 3, and the lower end of the inclined water inlet channel 4.1 is connected to the upper end of the top-flow sorting channel 3. In this way, the water flowing into the top-flow sorting channel 3 through the inclined water inlet channel 4.1 is conducive to forming a downward flow of water along the top-flow sorting channel 3.

[0077] The inlet channel 4 also includes a horizontal inlet channel 4.2. The upper end of the inclined inlet channel 4.1 is connected to one end of the horizontal inlet channel 4.2. The other end of the horizontal inlet channel 4.2 is a water inlet. This water inlet is connected to the inlet pipe 6. Thus, through the guidance of the horizontal inlet channel 4.2 and the inclined inlet channel 4.1, the water flow is facilitated to flow evenly and gently into the top-current sorting channel 3, forming a uniform and gentle water flow in the top-current sorting channel 3, which in turn facilitates the eel fry to swim upwards along the top-current sorting channel 3.

[0078] Furthermore, such as Figure 1 As shown, the lower end of the inclined inlet channel 4.1 and the upper end of the suction channel 5 are located on opposite sides of the upper end of the top-current sorting channel 3. In this way, after the eel fry swims up along the top-current sorting channel 3 to the top of the top-current sorting channel 3, it is beneficial for the eel fry to be sucked into the suction channel 5.

[0079] Furthermore, such as Figure 1As shown, the bottom of the eel fry rearing chamber 2 is provided with a conical guide port 2.1, the inner diameter of which gradually decreases from top to bottom. A discharge pipe is provided at the lower end of the conical guide port 2.1. A removable sealing end cap is provided at the lower end of the discharge pipe. Thus, after the eel fry sorting is completed, a rearing box can be placed below the discharge pipe, and then the sealing end cap can be opened to discharge the eel fry and water from the eel fry rearing chamber 2 into the rearing box. In this embodiment, the second outlet is located on the side wall of the discharge pipe. However, it should be noted that the second outlet can also be located separately on the bottom wall or the bottom of the side wall of the eel fry rearing chamber 2.

[0080] Specific embodiment four: a sorting method using an eel fry sorting device, wherein the specific structure of the eel fry sorting device in this sorting method is as described in specific embodiment three.

[0081] A sorting method using an eel fry sorting device includes the following steps in sequence:

[0082] The catch to be sorted is placed in sorting tank 1. The catch includes eel larvae, sandworms and mud.

[0083] Water flows into the top sorting channel 3 through the water inlet channel 4. Specifically, external water flows into the water inlet channel 4 through the water inlet pipe 6, and the water in the water inlet channel 4 flows into the top sorting channel 3.

[0084] A direct current of less than 36V is applied between the anode and cathode elements to create a direct current electric field of a certain intensity in the water of the sorting tank 1 and the eel fry temporary rearing chamber 2.

[0085] A portion of the water in the top-flow sorting channel 3 flows down into the sorting tank 1 and out through the first outlet 1.1; another portion of the water in the top-flow sorting channel 3 flows into the eel fry rearing chamber 2 through the suction channel 5 and out through the second outlet, thus forming a suction water flow zone at the top of the top-flow sorting channel 3 that flows towards the suction channel 5. During this process, utilizing the eel fry's tendency to flow upwards, the eel fry in the sorting tank 1, stimulated by the water flow, will swim upwards along the top-flow sorting channel 3. When the eel fry swim to the top of the top-flow sorting channel 3 and approach the upper end of the suction channel 5—specifically, when the eel fry swim to the suction water flow zone at the top of the top-flow sorting channel 3—they will be sucked into the suction channel 5 and enter the eel fry rearing chamber 2 under the action of the water flow in the suction channel 5.

[0086] At the same time, after being stimulated by the direct current electric field, the eel fry will turn their bodies towards the anode and swim towards it, which helps the eel fry enter the eel fry temporary rearing chamber 2 through the suction channel 5 and helps prevent the eel fry in the eel fry temporary rearing chamber 2 from escaping through the suction channel 5; thus realizing the automatic sorting of eel fry.

[0087] Sandworms are invertebrate benthic animals that prefer to inhabit sandy or muddy bottoms. They have weak swimming abilities and do not swim against the current, so the sandworms and mud will remain in the sorting tank 1. This achieves automatic sorting of eel larvae without causing injury or oxygen deprivation, effectively improving their survival rate. Therefore, it effectively solves the problems of manual sorting methods in existing technologies, which easily lead to injury, oxygen deprivation, and negative impacts on the quality of the temporary holding water, thus reducing the survival rate of eel larvae.

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A device for sorting eel fry, characterized in that, include: The sorting water tank has a first water outlet at the bottom, and an isolation net is installed at the first water outlet. The eel larvae rearing chamber has a second water outlet at the bottom, and an isolation net is installed at the second water outlet. The inclined top-flow sorting channel is connected at its lower end to the bottom of the sorting water tank and at its upper end to the water inlet channel. The inclined suction channel is connected at its upper end to the top of the top flow sorting channel and at its lower end to the top of the eel larvae rearing chamber. The flow velocity in the suction channel is greater than that in the top flow sorting channel, the flow velocity in the inlet channel is greater than that in the suction channel, and the cross-sectional area of ​​the top flow sorting channel is greater than that of the suction channel. The DC electric field device includes cathode elements distributed in the sorting tank and anode elements distributed in the eel fry temporary rearing chamber; The water inlet channel includes an inclined water inlet channel and a horizontal water inlet channel. The inclined angle of the inclined water inlet channel is the same as that of the top flow sorting channel. The lower end of the inclined water inlet channel is connected to the upper end of the top flow sorting channel. The upper end of the inclined water inlet channel is connected to one end of the horizontal water inlet channel. The other end of the horizontal water inlet channel is a water inlet connected to the water inlet pipe. The lower end of the inclined water inlet channel and the upper end of the suction channel are located on opposite sides of the upper end of the top flow sorting channel.

2. The eel fry sorting device according to claim 1, characterized in that, The bottom of the eel fry rearing chamber is equipped with a conical inlet, and the lower end of the conical inlet is equipped with a discharge pipe.

3. The eel fry sorting device according to claim 2, characterized in that, The lower end of the discharge pipe is equipped with a removable sealing end cap.

4. The eel fry sorting device according to claim 2 or 3, characterized in that, The second outlet is located on the side wall of the discharge pipe.

5. The eel fry sorting device according to claim 4, characterized in that, The first outlet is connected to the first drainage pipe, and the second outlet is connected to the second drainage pipe.

6. An eel fry sorting device according to claim 1, 2, or 3, characterized in that, It also includes a sorting box with a top opening, a sorting trough, an eel larvae rearing chamber, a top-flow sorting channel, and a suction channel, all of which are arranged inside the sorting box.

7. The eel fry sorting device according to claim 6, characterized in that, The top-flow sorting channel and the eel larvae temporary rearing chamber are located on the same side of the sorting tank.

8. The eel fry sorting device according to claim 7, characterized in that, The top-flow sorting channel is located between the eel larvae rearing chamber and the sorting tank.

9. A sorting method using the eel fry sorting device according to any one of claims 1-8, characterized in that, The steps are as follows: The catch to be sorted is placed in a sorting tank. The catch includes eel larvae, sandworms, and mud. Water flows into the top-flow sorting channel through the inlet channel. A portion of the water in the top-flow sorting channel flows down into the sorting tank and out through the first outlet. Another portion of the water in the top-flow sorting channel flows into the eel larvae rearing chamber through the suction channel and out through the second outlet. During this process, taking advantage of the eel larvae's tendency to swim upstream, the eel larvae in the sorting tank will be stimulated by the water flow and will swim upward along the top-flow sorting channel. When the eel larvae swim to the top of the top-flow sorting channel and approach the upper end of the suction channel, they will be sucked into the suction channel and enter the eel larvae rearing chamber under the action of the water flow in the suction channel. Sandworms and mud remain in the sorting tank.

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