A separate fish egg, fry, and juvenile fish sample collection device

Abstract

The application discloses a separated fish egg and fry sample collecting device, and belongs to the technical field of fish egg collecting. The collecting device comprises a main body, the main body can be hung and lifted on the side of a ship, the main body has a flowing path allowing water to vertically pass, the flowing path is provided with a support and a collecting piece, the collecting piece is provided with a net body surrounding the side of the support, the lower part of the main body is provided with a screen allowing fish eggs and fry to pass, the lower end of the net body is provided with a lower connecting pipe, the lower connecting pipe is fixed with the lower part of the support, the upper end of the net body is provided with an upper connecting pipe, the upper connecting pipe can slide along the support, the net body can be transversely expanded in the direction away from the support, and the upper connecting pipe is provided with a conical wall which is upwardly expanded. The fish egg and fry sample collecting device can quickly lower the net body to the required water depth, and the capturing area of the net body is enlarged during recovery, so that the capturing performance of plankton is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine resource collection, in particular to a separated fish egg, fry and juvenile fish sample collection device. BACKGROUND

[0002] Fish egg collection is an important part of fish artificial breeding. Most artificially bred fish will release eggs after artificial induction of spawning, some will release eggs by themselves, and some will release eggs artificially. A small number of oviparous fish, such as most cartilaginous fish and bony fish, complete their embryonic development in the body, and are released as fry when they are released from the body. In production, the fish eggs and fry of self-ovipositing or oviparous fish are usually collected by the method of original pond spawning, removing parent fish or net cage collection. However, original pond spawning will cause confusion among offspring, and cannot meet the needs of separate isolation of offspring. In addition, net cage isolation collection not only occupies equipment and is complicated, but also often limits the activity range of parent fish during the spawning period, which causes difficulties for some fish that have special requirements for fixed locations or environments for spawning.

[0003] Many marine fish such as silver pomfret, small yellow croaker, and black seabream have the characteristics of continuous, multiple batches, and small amount of spawning during the spawning period. After fertilization, many of these fish eggs are buoyant or semi-buoyant. In order to collect as many fish eggs as possible, artificial trawl or a large amount of water is discharged after spawning to collect the fish eggs by filtering the discharged seawater with a net. The above-mentioned methods not only damage the fish eggs and reduce the hatching rate of fry, but also waste a large amount of labor and water resources, and easily scratch the parent fish during the collection of fish eggs and make them frightened.

[0004] In order to solve the above-mentioned problems in the prior art, a plankton collection device is disclosed in Korean Patent Publication No. KR102203796B1, which includes a net inside the main body, which can extend horizontally under the action of water pressure to salvage organisms that reach above it. The invention ensures the safety of workers when the main body is recovered, and the extendable net can improve the capture amount of plankton. However, in the prior art, during the process of collecting fish eggs by moving the net, the mesh of the net is too large, which easily causes small fish eggs to leak out, reduces the capture amount, and easily cuts the fish eggs when the net is retracted, which damages the integrity of the fish eggs and reduces their quality. SUMMARY

[0005] The purpose of the present application is to provide a separated fish egg, fry and juvenile fish sample collection device which is easy to operate and has high collection amount and quality.

[0006] To solve the above-mentioned technical problems, the present application specifically provides the following technical solutions:

[0007] A kind of separate fish egg, fry sample collection device, comprising: main body, main body can be suspended and lifted in the side of ship, main body has the flow path allowing water to pass vertically, flow path has support and collection piece in it, collection piece has the net body around the side of support.

[0008] Preferably, the lower part of the main body has a screen that can pass fish eggs and fry.

[0009] Preferably, the lower end of the net body is provided with a lower connecting pipe fixed with the lower part of the support, and the upper end of the net body is provided with an upper connecting pipe capable of sliding along the support. The net body can be laterally expanded away from the support, and the upper connecting pipe has a tapered wall that expands upward. When the main body is put into water through the ship body, the screen filters adult fish and other large materials, so that the water carrying fish eggs and fry flows upward in the flow path after passing through the screen. During the sinking process of the main body, the tapered wall is subjected to the force of the upward flowing water, carrying the upper connecting pipe to slide upward relative to the support. Since the bottom of the net body is fixed relative to the support through the lower connecting pipe, the net body is stretched along the extension direction of the support and folded around the periphery of the support, which helps to speed up the speed of the main body reaching the preset depth after sinking by reducing the lateral contact area of the net body with the water, thereby improving the collection efficiency. At the same time, the stability of the overall center of gravity of the collection device is improved by the adhesion of the net body to the support, which helps to maintain a stable vertical posture during the sinking process of the main body, improves the collection effect of fish eggs and fry, and also helps to reduce the interference with the equipment used to lift the collection piece.

[0010] After the main body sinks for a period of time, the fish eggs and fry reach the space above the screen, and the main body is pulled up. At this time, the upper connecting pipe moves downward relative to the support under the action of water pressure and its own gravity, causing the net body to expand away from the support. The upper part of the net body can be overlapped with the lower part of the net body, and the outer edge of the overlapped net body can abut against the inner side of the main body to form a flow channel inner bottom seal, thereby collecting the fish eggs and fry above. The entire collection process only requires the main body to be lowered and raised, and the contraction and expansion of the net body are achieved by using water pressure and self-weight, thereby completing the entry and interception of fish eggs and fry. This improves the collection efficiency while facilitating operation.

[0011] The tapered wall can be better affected by the flowing water during the rising process, improving the sliding speed of the upper connecting pipe on the support, thereby improving the overlapping speed of the net body and reducing the probability of fish eggs and fry leaking out.

[0012] Preferably, the flow path further has a flow guide, which comprises a support ring matched with the inner wall of the main body, and the support ring has an extension plate at the top, which is bent and extended to the lower part of the support, and the extension plate is a flexible plate. During the process of the main body sinking into the water, the water body carries the fish eggs and the fry to flow through the flow channel quickly, and part of the fish eggs and the fry flow along the inner wall of the main body quickly and easily leave the main body and cannot be collected. The extension plate can be deformed by the upward water flow when the main body sinks and forms a horizontal posture close to the support. The extension plate in this posture can intercept the fish eggs and the fry flowing with the water body, thereby reducing the number of fish eggs and fry flowing out of the flow channel.

[0013] During the process of the main body rising out of the water body, the extension plate deforms under the water pressure, so that the extension plate deforms towards the support ring, and at the same time, the net body unfolds towards the direction close to the support ring. At this time, the deformed extension plate provides space for the unfolding of the net body and shapes the unfolding of the net body, so as to ensure that the upper and lower parts of the net body can be uniformly overlapped, thereby reducing the possibility of entanglement of the net wire caused by local collapse during the overlapping process of the net body, reducing the possibility of entanglement of the fish eggs and the fry by the net wire after the device is collected, and improving the portability of the fish eggs and the fry after the collection is completed.

[0014] Since the process of the net body overlapping and deforming during the rising of the main body needs time, the extension plate can guide the water flowing downward in the flow channel to the middle part during the deforming process. On the one hand, the guided water flow accelerates the speed of the net body overlapping, thereby reducing the number of fish eggs and fry escaping, improving the collection amount, and on the other hand, it is beneficial to reduce the contact amount of the water body with the fish eggs and the fry intercepted by the extension plate, thereby further reducing the probability of the fish eggs and the fry leaking out of the flow channel and improving the collection amount.

[0015] Preferably, the flow guides are arranged at intervals along the extension direction of the flow path, and the two adjacent extension plates and the support ring therebetween form a storage cavity. When the main body is out of the water, the downward swinging and deformed extension plate can form a storage cavity with the extension plate below and the support ring therebetween to collect the fish eggs and the fry intercepted during sinking. After the main body is placed flat or inverted, the fish eggs and the fry collected in the storage cavity can be poured out by taking out each flow guide from the outside to the inside in turn, realizing rapid collection, reducing the difficulty of taking out the fish eggs and the fry, thereby reducing the possibility of damage to the collected objects, ensuring the quality of the fish eggs and the fry, and since the extension plate is a flexible plate, the edges thereof will not scratch the passing fish eggs and fry.

[0016] Preferably, the inner wall of the main body has a receiving part to support the bottom of the lowermost flow guide.

[0017] Preferably, the support has protrusions spirally wound on the outer side, and the upper connecting pipe has guide grooves matched with the protrusions on the inner wall, and the upper connecting pipe can rotate and slide on the outer side of the support through the matching of the protrusions and the guide grooves. The matching of the protrusions and the guide grooves is arranged so that the upper connecting pipe rotates during the sliding relative to the support, causing the upper part of the net body to rotate relative to the lower part during the contraction and expansion of the net body, thereby facilitating the misalignment of the meshes of the upper part of the net body and the meshes of the lower part of the net body, i.e., the gap between the meshes formed after the overlapping of the net body is smaller, thereby improving the interception and collection capacity of the net body for fish eggs and fry without increasing the number of net wires, reducing the manufacturing cost, and increasing the collection capacity.

[0018] The small mesh gap can reduce the possibility of fish eggs and fry being stuck in the mesh, thereby improving the quality of the fish eggs and fry collected by the net body.

[0019] The relatively rotating upper part and lower part of the net body can rub against each other during the overlapping process, promoting the removal of the attached silt, and the removed silt is discharged from the main body along with the falling water body, thereby reducing the weight increase caused by the silt during the recovery of the collection device, improving the safety of the main body recovery, reducing the load of the recovery main body equipment, and reducing the possibility of the silt mixing with the fish eggs after the recovery of the device, thereby improving the screening efficiency.

[0020] Preferably, the net body has a reinforcing rib, the reinforcing rib has a length along the extension direction of the support, and the reinforcing rib is fixed and arranged around the periphery of the net body based on the support. The arrangement of the reinforcing rib improves the overall structural strength of the net body and facilitates the regular deformation of the upper part and the lower part of the net body, thereby reducing the possibility of winding.

[0021] Preferably, the main body and the support have a connecting ring at the upper end, and the connecting ring is used to connect a towing rope.

[0022] Preferably, the lower connecting pipe has a mounting hole on the side surface, the lower connecting pipe is connected to the support through a threaded fastener passing through the mounting hole, and the height position of the lower connecting pipe on the support is adjustable.

[0023] The present application has the following beneficial effects compared with the prior art: the net body can realize contraction and expansion respectively when being submerged and out of water, the contraction can help the device to quickly reach the preset water depth, improve the laying efficiency, and the expansion can expand the capture area and improve the collection amount; the guide member intercepts the fast-floating fish eggs and fry when entering the water, reduces the escape amount, and guides the falling water body to the middle when out of water, ensures that the intercepted part is not lost due to water flow, and realizes auxiliary collection; the guide member reshapes the net body, reduces the probability of net body winding; the guide members arranged at intervals form storage cavities, which facilitate the transfer and storage efficiency of fish eggs and fry; the bracket and the upper connecting pipe realize relative sliding rotation through the protrusion and the guide groove, the mesh gap formed after the net body overlaps is smaller, the number of net lines of the net body is not increased, the quality of fish eggs is improved, the production cost and the collection amount are reduced; the formed small mesh can reduce the possibility of fish eggs and fry being clamped, and improve the quality of fish eggs and fry. The twisted net body removes the silt, reduces the mixing amount of silt, and improves the screening efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and other drawings can be obtained by the provided drawings without creative labor for those skilled in the art.

[0025] Figure 1 It is a whole schematic diagram of a separated fish egg and fry sample collection device.

[0026] Figure 2 It is a sectional view schematic diagram of a separated fish egg and fry sample collection device.

[0027] Figure 3 It is a sectional view schematic diagram of a separated fish egg and fry sample collection device. Figure 2 It is an enlarged schematic diagram of area A in the middle.

[0028] Figure 4 It is an enlarged schematic diagram of area B in the middle. Figure 2 It is an enlarged schematic diagram of area B in the middle.

[0029] Figure 5 It is an enlarged schematic diagram of area C in the middle. Figure 2 It is an enlarged schematic diagram of area C in the middle.

[0030] Figure 6 It is a schematic diagram of the connection between the conical sleeve and the blade.

[0031] Reference signs: main body 1; flow path 10; connecting ring 11; support 2; collecting piece 3; net body 30; lower connecting pipe 31; upper connecting pipe 32; tapered wall 320; reinforcing beam 310; screen 4; flow guide piece 5; support ring 51; extension plate 52; receiving part 53; protrusion 6; guide groove 7; tapered sleeve 8; leaf plate 9. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0033] The concepts involved in the present application will be described below with reference to the drawings. It should be noted that the following descriptions of the concepts are only for the purpose of making the content of the present application easier to understand, and do not represent a limitation on the protection scope of the present application. Meanwhile, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] Reference is made to the drawings Figure 1 - the drawings Figure 2 A split fish egg and fry sample collecting device includes a main body 1, the main body 1 can be suspended and lifted on the side of a ship, the main body 1 has a flow path 10 allowing water to pass vertically, the flow path 10 has a support 2 and a collecting piece 3, the collecting piece 3 has a net body 30 surrounding the side of the support 2.

[0035] The lower part of the main body 1 has a screen 4 allowing fish eggs and fry to pass.

[0036] The lower end of the net body 30 is provided with a lower connecting pipe 31 fixed with the lower part of the support 2, and the upper end of the net body 30 is provided with an upper connecting pipe 32 slidable along the support 2, the net body 30 can expand laterally away from the support 2, and the upper connecting pipe 32 has a tapered wall 320 expanding upward.

[0037] When the main body 1 is put into water through the hull, the screen 4 filters adult fish and other large materials, so that the water body carrying the fish eggs and the juvenile fish flows upward in the flow path 10 after passing through the screen 4, and during the sinking process of the main body 1, the conical wall 320 is subjected to the force of the upward flowing water body, and carries the upper connecting pipe 32 to slide upward relative to the support 2, because the bottom of the net body 30 is fixed relative to the support 2 through the lower connecting pipe 31, the net body 30 is stretched along the extension direction of the support 2 and folded on the periphery of the support 2, which helps to accelerate the speed of the main body 1 to reach the preset depth after sinking into water by reducing the lateral contact area of the net body 30 with the water body, and improves the collection efficiency, at the same time, the stability of the overall center of gravity of the collection device is stabilized by the adhesion of the net body 30 to the support 2, which helps to maintain the stable posture of the main body 1 during the sinking process, improves the collection effect of the fish eggs and the juvenile fish, and is also beneficial to reduce the interference with the equipment for lifting the collection member 3;

[0038] After the main body 1 sinks for a period of time, the fish eggs and the juvenile fish reach the space above the screen 4, and the main body 1 is pulled up, at this time, under the action of water pressure and its own gravity, the upper connecting pipe 32 moves downward relative to the support 2, so that the net body 30 expands in a diffusion manner away from the support 2, so that the upper part of the net body 30 can be overlapped with the lower part of the net body 30, and the outer edge of the overlapped net body 30 can abut against the inner side of the main body 1 to form a seal on the inner bottom of the flow channel, so as to collect the fish eggs and the juvenile fish above it, and the whole collection process only needs to lower and raise the main body 1, and the contraction and expansion of the net body 30 are realized by using water pressure and self-weight, so as to complete the entry and interception of the fish eggs and the juvenile fish, which is convenient to operate and improves the collection efficiency;

[0039] The conical wall 320 can be better affected by the flowing water body during the rising process, the sliding speed of the upper connecting pipe 32 on the support 2 is improved, the overlapping speed of the net body 30 is improved, the probability of fish eggs and juvenile fish leaking out is reduced, and the collection amount is improved.

[0040] Referring to the drawings Figure 3 The flow path 10 also has a flow guide member 5, the flow guide member 5 includes a support ring 51 cooperating with the inner wall of the main body 1, the support ring 51 has an extension plate 52 on the top, the extension plate 52 bends and extends to the lower part of the support 2, and the extension plate 52 is a flexible plate.

[0041] During the sinking process of the main body 1, the water body carries the fish eggs and the juvenile fish to quickly pass through the flow channel, part of the fish eggs and the juvenile fish flow along the inner wall of the main body 1 and are easily lost from the main body 1 and cannot be collected, the extension plate 52 can be deformed under the impact of the upward water flow when the main body 1 sinks, so that the extension plate 52 forms a horizontal posture close to the support 2, and the extension plate 52 in this posture can intercept the fish eggs and the juvenile fish flowing upward with the water body, thereby reducing the number of fish eggs and juvenile fish lost from the flow channel;

[0042] During the process of the main body 1 rising out of the water, the extension plate 52 deforms under the action of water pressure, so that the extension plate 52 deforms towards the support ring 51, and at the same time, the net body 30 unfolds towards the direction close to the support ring 51. At this time, the deformed extension plate 52 provides space for the unfolding of the net body 30 on the one hand, and forms shaping for the unfolding of the net body 30 on the other hand, so as to ensure that the upper and lower parts of the net body 30 can be uniformly overlapped, reduce the possibility of entanglement of the net wire due to local collapse during the overlapping process of the net body 30, thereby reducing the possibility of entanglement of the fish eggs and fry by the net wire after the device is collected, and improving the portability of the fish eggs and fry after the collection is completed.

[0043] Since the process of the net body 30 overlapping and deforming during the rising of the main body 1 needs time, the extension plate 52 can guide the water flowing downward in the flow channel to the middle part during the deforming process, on the one hand, the guided water flow accelerates the speed of the overlapping of the net body 30, reduces the number of escaped fish eggs and fry, and thereby improves the collection amount, on the other hand, it is beneficial to reduce the contact amount of the water and the fish eggs and fry intercepted by the extension plate 52, further reduces the probability of the fish eggs and fry leaking from the flow channel, and improves the collection amount.

[0044] The flow guide 5 is arranged at intervals along the extension direction of the flow path 10, and the adjacent two extension plates 52 and the support ring 51 therebetween form a storage cavity.

[0045] When the main body 1 is out of the water, the downward swinging deformed extension plate 52 can form a storage cavity with the extension plate 52 below it and the support ring 51 therebetween, collect the fish eggs and fry intercepted during sinking, and after the main body 1 is placed flat or inverted after the main body 1 is out of the water, the fish eggs and fry collected in the storage cavity can be poured out by taking out each flow guide 5 from the outside to the inside in turn, realizing fast collection, reducing the difficulty of taking out the fish eggs and fry, thereby reducing the possibility of damage to the collected objects, ensuring the quality of the fish eggs and fry, and since the extension plate 52 is a flexible plate, its edge will not scratch the passing fish eggs and fry.

[0046] The inner wall of the main body 1 has a receiving part 53 which supports the bottom of the lowermost flow guide 5.

[0047] When installing, the flow guides 5 are sequentially placed in the main body 1, the receiving part 53 forms bottom support for the support ring 51 of the lowermost flow guide 5, and the remaining support rings 51 are bottom supported by the support ring 51 below them, completing the equidistant stacking of multiple flow guides 5.

[0048] Referring to the drawings Figure 4The upper connecting pipe 32 has a guide groove 7 on the inner wall matched with the convex 6 on the outer side of the support 2, and the upper connecting pipe 32 can rotate and slide on the outer side of the support 2 through the matching of the convex 6 and the guide groove 7. The matching of the convex 6 and the guide groove 7 is arranged so that the upper connecting pipe 32 rotates during the sliding relative to the support 2, causing the upper part of the net body 30 to rotate relative to the lower part during the contraction and expansion, thereby facilitating the dislocation of the meshes in the upper part of the net body 30 and the meshes in the lower part of the net body 30, that is, the gap between the meshes formed after the overlap of the net body 30 is smaller, thereby improving the interception and collection capacity of the net body 30 for fish eggs and juvenile fish without increasing the number of mesh wires of the net body 30, reducing the manufacturing cost, and increasing the collection capacity;

[0049] The small mesh gap can reduce the possibility of fish eggs and juvenile fish being clamped in the mesh, thereby improving the quality of the fish eggs and juvenile fish collected by the net body 30;

[0050] The net body 30 has a reinforcing rib having a length along the extension direction of the support 2, and the reinforcing rib is arranged peripherally around the net body 30 based on the support 2. The arrangement of the reinforcing rib improves the overall structural strength of the net body 30 and facilitates regular deformation of the upper part and the lower part of the net body 30, thereby reducing the possibility of winding.

[0051] The main body 1 and the support 2 have a connecting ring 11 at the upper end, and the connecting ring 11 is used to connect a traction rope.

[0052] Referring to the drawings, Figure 5 The lower connecting pipe 31 has a mounting hole on the side surface, and the lower connecting pipe 31 is connected to the support 2 through a threaded fastener passing through the mounting hole, and the height position of the lower connecting pipe 31 on the support 2 is adjustable.

[0053] After confirming the height position of the connecting pipe on the support 2 according to the requirements, the threaded fastener is passed through the mounting hole and tightened, so that the head of the threaded fastener is in contact with the side surface of the support 2, thereby achieving the adjustable installation of the lower connecting pipe 31.

[0054] The threaded fastener realizes the detachable connection of the lower connecting pipe 31 and the support 2, and by loosening the threaded fastener, the whole collecting device 3 can be easily taken out from below the main body 1, thereby facilitating the centralized processing of the collected fish eggs and juvenile fish.

[0055] Referring to the drawings, Figure 6 The conical sleeve 8 has a leaf plate 9 arranged around the outer side surface.

[0056] It should be noted that in order to reduce the overall weight of the device and ensure the mobility of the upper connecting pipe 32, the leaf plate 9 is made of a foam plate with buoyancy.

[0057] During the sinking process of the main body 1, the upper connecting pipe 32 rotates and slides upward relative to the support 2, synchronously driving each of the leaf plates 9 on the conical sleeve 8 to rotate, and the rotation of the leaf plates 9 promotes the water in the flow channel to form upward rotating flow, which can guide the fish eggs and fry flowing along the inner wall of the main body 1, thereby improving the probability and quantity of the fish eggs and fry being intercepted by the extension plate 52, and further improving the collection amount.

[0058] The rotating flow generated by the rotation of the leaf plates 9 can be continuously guided through the water in the flow channel, reducing the impact of the lateral water on the main body 1, which helps the main body 1 to maintain a vertical posture when entering the water, thereby improving the efficiency and stability of the device when it is arranged to enter the water. At the same time, it can also reduce the sway of the ship body, which is conducive to improving the stability of the ship body.

[0059] During the lifting process of the main body 1 out of the water, the upper connecting pipe 32 rotates and slides downward relative to the support 2, and at this time the rotation of the leaf plates 9 promotes the water in the flow channel to form downward rotating flow, which can promote the water to carry the silt through the net body 30 and the bottom screen 4 to discharge the main body 1. On the one hand, it reduces the weight increase caused by the silt when the collection device is recovered, improves the safety of the main body 1 recovery, reduces the load of the equipment for recovering the main body 1, and on the other hand, it realizes the cleaning of the collected objects, reduces the possibility of mixing the silt with the fish eggs after the device is recovered, optimizes the cleaning process, and improves the screening efficiency.

[0060] The downward rotating flow can act on the net body 30, so that the net lines of the net body 30 are suspended along the rotation direction of the rotating flow during the unfolding process, that is, the net lines of the net body 30 are evenly spaced from each other during the unfolding process, which can effectively reduce the possibility of self-winding of the net body 30.

[0061] The upward rotating flow and the downward rotating flow can clean the support 2, so that the upper connecting pipe 32 can smoothly slide and rotate, thereby ensuring the interception and capture ability of the net body 30 to the collected objects.

[0062] Since the leaf plates 9 are made of foam material with buoyancy, the leaf plates 9 can assist the upper connecting pipe 32 to quickly move upward on the support 2 during the sinking of the main body 1, thereby reducing the water resistance of the net body 30 and improving the sinking speed.

[0063] The above-described embodiments and / or implementations are only used to illustrate the preferred embodiments and / or implementations of the present application, and do not limit the embodiments of the present application in any form. Any person skilled in the art can make some changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the present application, but the changes or modifications should be considered as the same technology or embodiment as the present application.

[0064] The principles and implementation manners of the present application are described herein by using specific examples, and the above example descriptions are only used to help understand the method of the present application and its core idea. The above descriptions are only preferred embodiments of the present application, and it should be pointed out that, due to the limited nature of the language expression, there are objectively infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the present application, and the above technical features can also be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A separate sample collection device for fish eggs and larvae, comprising: The main body (1) is capable of being suspended and raised / lowered on the side of the ship. It is characterized by having a flow path (10) that allows water to pass vertically through it. The flow path (10) includes a support (2) and a collection element (3). The collection element (3) has a net (30) surrounding the side of the support (2). The flow path (10) also includes a guide element (5). The guide element (5) includes a support ring (51) that engages with the inner wall of the main body (1). The top of the support ring (51) has an extension plate (52). The extension plate (52) bends and extends towards the lower part of the support (2). The extension plate (52) is a flexible plate. During the process of the main body (1) being submerged in water, the extension plate (52) is impacted by the upward water flow and deformed when the main body (1) sinks, so that the extension plate (52) forms a horizontal posture close to the support (2). During the process of the main body (1) being recovered and rising away from the water body, the extension plate (52) deforms under the action of water pressure, causing the extension plate (52) to deform toward the support ring (51). At the same time, the net body (30) unfolds toward the support ring (51).

2. The separate fish egg and larval fish sample collection device according to claim 1, characterized in that: The lower part of the main body (1) has a sieve (4) that allows fish eggs and fry to pass through.

3. The separate fish egg and larvae / juvenile fish sample collection device according to claim 1, characterized in that: The lower end of the net body (30) is provided with a lower connecting pipe (31), which is fixed to the lower part of the support (2). The upper end of the net body (30) is provided with an upper connecting pipe (32), which can slide along the support (2). The net body (30) can expand laterally away from the support (2). The upper connecting pipe (32) has an upwardly expanding conical wall (320).

4. The separate fish egg and larvae / juvenile fish sample collection device according to claim 1, characterized in that: The flow guide (5) is spaced apart along the extension direction of the flow path (10), and the two adjacent extension plates (52) and the support ring between them form a storage cavity.

5. The separate fish egg and larvae / juvenile fish sample collection device according to claim 1, characterized in that: The inner wall of the main body (1) has a receiving part (53) that supports the bottom of the lowest flow guide (5).

6. The separate fish egg and larvae / juvenile fish sample collection device according to claim 3, characterized in that: The bracket (2) has a spirally wound protrusion (6) on the outside, and the upper connecting tube (32) has a guide groove (7) on the inner wall that cooperates with the protrusion (6). The upper connecting tube (32) can rotate and slide on the outside of the bracket (2) through the cooperation of the protrusion (6) and the guide groove (7).

7. The separate fish egg and larvae / juvenile fish sample collection device according to claim 1, characterized in that: The net body (30) has reinforcing ribs (310) with a length along the extension direction of the support (2), and the reinforcing ribs (310) are fixedly arranged around the periphery of the net body (30) based on the support (2).

8. The separate fish egg and larval fish sample collection device according to claim 1, characterized in that: The main body (1) and the bracket (2) have a connecting ring (11) at the upper end, which is used to connect the traction rope (12).

9. The separate fish egg and larvae / juvenile fish sample collection device according to claim 3, characterized in that: The lower connecting pipe (31) has a mounting hole on its side. The lower connecting pipe (31) is connected to the bracket (2) by a threaded fastener passing through the mounting hole. The height position of the lower connecting pipe (31) on the bracket (2) is adjustable.

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