A device for catching tilapia fry
By designing a tilapia fry harvesting device, which automatically separates fry of different sizes using a slatted net and a filter, the problems of low efficiency in manual harvesting and injury to parent fish from netting are solved, achieving efficient fry sorting and stable breeding efficiency.
Patent Information
- Application Number
- CN202521379403.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-02
- Publication Date
- 2026-07-03
- Estimated Expiration
- 2035-07-02
AI Technical Summary
Existing tilapia fry harvesting techniques suffer from low efficiency due to manual harvesting and the destructive nature of concentrated netting, which leads to larger fry eating smaller fry and netting injuring parent fish, thus affecting reproductive efficiency and fry stability.
Design a tilapia fry harvesting device, including a fry collection box, a slatted net, and a filter section. Utilizing the fry's tendency to swim along the edges, the slatted net guides larger fry into the collection area, while the filter section precisely separates smaller fry, achieving automatic separation and precise harvesting.
It enables 24-hour uninterrupted sorting of fish fry, eliminates the problem of large fry residue, improves reproductive efficiency by more than 20%, and ensures the normal spawning cycle of parent fish and the continuous and stable production of fry.
Smart Images
Figure CN224440134U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of aquaculture technology, and in particular to a tilapia fry catching device. Background Technology
[0002] Large-scale tilapia breeding typically employs an earthen pond spawning model: during the breeding season, parent fish are released into the pond in a specific ratio. Males dig nests at the bottom of the pond, and females enter these nests to lay eggs and complete oral incubation. Once the fry reach the level swimming stage, they detach from their mothers and swim in groups near the pond's edge, a phenomenon known as "swimming along the shore." This is the optimal time for harvesting. If not harvested in time, the fry will spread throughout the pond within three days, leading to mixing of different batches.
[0003] Existing fishing operations face two major technical bottlenecks:
[0004] 1. Low efficiency of manual harvesting: Currently, the main method relies on repeated manual fishing along the shore with landing nets, which is labor-intensive and makes it difficult to completely remove fish fry. Remaining fry grow rapidly into large-sized fry, preying on newly born fry, resulting in a "large fry eat small fry" phenomenon. This is the core reason why tilapia have a sufficient quantity and uniform size in the early breeding stage, but a sharp decline in yield and inconsistent size in the later stage.
[0005] 2. The destructive effect of concentrated netting: The pond netting operation used to remove large fry will disturb the parent fish, causing them to regurgitate oral contents containing incubated eggs or fry that have not yet floated to the surface. These embryos and fry will sink to the bottom and die due to lack of oxygen. At the same time, the stress response of the parent fish will significantly inhibit the subsequent spawning cycle, directly reducing the overall reproductive efficiency.
[0006] There is an urgent need in the field for equipment that can automatically separate fish fry of different sizes and achieve precise fishing, so as to reduce labor intensity and solve the dual dilemma of "large fry eating small fry" and "netting injuring parent fish". Utility Model Content
[0007] The purpose of this utility model is to provide a tilapia fry catching device to solve the problems existing in the prior art. It is an equipment that can automatically separate fry of different sizes and achieve precise catching, thereby reducing labor intensity and breaking the dual dilemma of "large fry eating small fry" and "netting injuring parent fish".
[0008] To achieve the above objectives, this utility model provides the following solution:
[0009] A tilapia fry harvesting device, comprising:
[0010] Fry collection boxes are placed in the aquaculture pond near the shore to collect small fish fry;
[0011] At least two sets of slatted netting, one end of which extends to the bank of the aquaculture pond and the other end is connected to the seedling collection box;
[0012] The fry collection area, enclosed by the fry collection box, the perforated net, and the bank of the aquaculture pond, is used to collect large fish fry.
[0013] A filter section is provided on the side wall of the fry collection box outside the fry collection area, allowing small fry to enter the fry collection box and blocking large fry.
[0014] The slatted net and the fry collection box form a passage for large fish fry to enter the fry collection area.
[0015] In one exemplary embodiment, a solid net is also included, one end of which is away from the shore, and the other end is connected to the side wall of the seedling collection box located outside the seedling collection area.
[0016] In an exemplary embodiment, the filter section is disposed on both sides of the seedling collection box in a direction parallel to the bank of the aquaculture pond;
[0017] The wicker mesh is connected to the nearshore side of the filter section, forming the channel;
[0018] The solid mesh is connected to the far shore side of the filter section.
[0019] In one exemplary embodiment, the dotted mesh and the solid mesh surround each other to form a figure-eight shaped channel.
[0020] In one exemplary embodiment, the side walls of the fry collection box, excluding the filter section, are provided with a dense net to prevent the fry from escaping.
[0021] In one exemplary embodiment, the filter section and the mesh are detachably connected.
[0022] In one exemplary embodiment, the filter section is provided with a locking post, the mesh is provided with a locking sleeve, and the locking post is inserted into the locking sleeve to achieve fixation.
[0023] In one exemplary embodiment, the filter section includes a frame, with the locking posts arranged on the left and right sides of the frame, and the winding posts arranged at the top and bottom ends of the frame. A transparent winding thread is wound between two of the winding posts to form a filter fence.
[0024] In an exemplary embodiment, the cross-section of the winding post is a right-angled triangle, with its first right-angled face fixed to the frame and its second right-angled face coplanar with the outer edge of the frame; the top edge of the second right-angled face is provided with equally spaced notches, which are used to limit the transparent winding.
[0025] In one exemplary embodiment, the inclined surface of the winding post is provided with a winding pin.
[0026] The present invention achieves the following technical advantages over the prior art:
[0027] 1. The channel formed by the slack net and the fry collection box guides large fish fry to swim into the fry collection area on their own. At the same time, the filter section accurately intercepts large fish fry and releases small fish fry into the fry collection box, realizing 24-hour uninterrupted sorting, completely eliminating the problem of large fry remaining due to manual missed catch, and eliminating the phenomenon of "large fry eating small fry" from the root.
[0028] 2. The device is fixed on the shore and operates statically, completely avoiding the need for full-pond netting: the parent fish will not be stressed and spit out eggs; there is no risk of fertilized eggs / unswimming fry sinking to the bottom and dying; the spawning cycle of the parent fish is not disturbed; thus increasing the reproductive efficiency by more than 20%, while ensuring the stability of continuous fry production. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 A schematic diagram of the tilapia fry harvesting device disclosed in a specific embodiment of this utility model;
[0031] Figure 2 for Figure 1 Schematic diagram showing the connection method between the seedling tray and the dotted and solid fences;
[0032] Figure 3 for Figure 1 A schematic diagram of the dense mesh and card sleeve in the seedling collection box;
[0033] Figure 4 for Figure 2 Schematic diagram of the frame structure of the middle filter section;
[0034] Figure 5 This is a schematic diagram of the winding method for the filter section;
[0035] Among them, 1. Seedling box; 2. Loose netting; 3. Seedling collection area; 4. Filter section; 5. Channel; 6. Solid netting; 7. Dense netting; 8. Holding post; 9. Holding sleeve; 10. Square frame; 11. Winding post; 12. Transparent winding; 13. Notch; 14. Winding nail; 15. Pond bank. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0037] The purpose of this invention is to provide a tilapia fry catching device to solve the problems existing in the prior art. It is an equipment that can automatically separate fry of different sizes and achieve precise catching, thereby reducing labor intensity and breaking the dual dilemma of "large fry eating small fry" and "netting injuring parent fish".
[0038] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0039] Please refer to Figures 1 to 5 This embodiment provides a tilapia fry harvesting device, including a fry collection box 1 and at least two sets of perforated nets 2. The fry collection box 1 is located in a culture pond near the shore and is used to collect small fry. One end of each of the at least two sets of perforated nets 2 extends to the shore 15 of the culture pond, and the other end is connected to the fry collection box 1. The fry collection box 1, the perforated nets 2, and the shore 15 of the culture pond enclose a fry collection area 3 for collecting larger fry. A channel 5 is formed between the perforated nets 2 and the fry collection box 1 to allow larger fry to enter the fry collection area 3. A filter section 4 is provided on the side wall of the fry collection box 1 outside the fry collection area 3. The filter section 4 allows small fry to enter the fry collection box 1 while blocking larger fry.
[0040] The working principle of this embodiment is as follows:
[0041] When the fish fry swim to the collection box 1 and the loose net 2 near the shore, the loose net 2 can behaviorally guide them to gather in the collection box 1 by utilizing their "swimming along the edge" habit. The filter part 4 on the collection box 1 precisely intercepts the larger fish fry and releases the smaller fish fry into the collection box 1. The larger fish fry swim into the collection area 3 through the channel 5 formed between the loose net 2 and the collection box 1, achieving 24-hour uninterrupted sorting and completely eliminating the problem of large fish fry remaining due to manual missed catch, thus preventing the phenomenon of "large fish eating small fish fry" from the root.
[0042] In addition, this embodiment is set up to operate statically on the shore, completely avoiding the operation of netting the entire pond. The parent fish will not be stressed and will not spit out eggs. There is no risk of fertilized eggs / unswimming fry sinking to the bottom and dying. Moreover, the spawning cycle of the parent fish is not disturbed, thereby increasing the reproductive efficiency by more than 20% and ensuring the stability of continuous fry production.
[0043] As a preferred embodiment, the fishing device is further equipped with a solid net 6, one end of which is away from the shore, and the other end is connected to the side wall of the fry collection box 1 outside the fry collection area 3. When tilapia encounter obstacles while swimming, although they will not turn around, they will swim to the sides to avoid the obstacles. Thus, when the fry swim to the fry collection box 1 and the loose net 2, although the small fry can enter the fry collection box 1, the large fry will be diverted to the sides. The large fry swimming to one side of the channel 5 can enter the fry collection area 3, but the large fry swimming to the other side may swim back to the depths of the pond. By setting up the solid net 6, the large fry swimming to the other side can be intercepted.
[0044] To achieve better induction and sorting effects, the filter section 4 is set on both sides of the fry collection box 1, parallel to the bank 15 of the aquaculture pond. The loose net 2 is directly connected to the near-shore side of the filter section 4, forming a channel 5, and the solid net 6 is connected to the far-shore side of the filter section 4. The loose net 2 and the solid net 6 can further surround each other to form a figure-eight channel. After the fry swim along the loose net 2 and the solid net 6 to the fry collection box 1, the small fry can directly pass through the filter section 4 into the fry collection box 1 without turning. The large fry on the side of the loose net 2 directly pass through the channel 5 into the fry collection area 3, while the large fry on the side of the solid net 6 need to turn once, swim to the side of the loose net 2, and then pass through the channel 5 into the fry collection area 3.
[0045] In this embodiment, the side wall of the fry collection box 1, excluding the filter section 4, is provided with a dense net 7, and the mesh size of the dense net 7 is set to prevent the small fish fry from escaping.
[0046] Furthermore, the filter section 4 and the mesh screen 7 are detachably connected.
[0047] Specifically, the filter section 4 is equipped with a retaining post 8, and the mesh screen 7 is equipped with a retaining sleeve 9. The retaining post 8 is inserted into the retaining sleeve 9 to achieve fixation.
[0048] The filter section 4 specifically includes a frame 10, with locking posts 8 on both the left and right sides of the frame 10. A side slit is provided on the side of the sleeve 9 closest to the filter section 4 to make room for the frame 10 when the locking posts 8 are inserted into the sleeve 9. Winding posts 11 are provided at the top and bottom ends of the frame 10, and a transparent winding wire 12 is wound between the two winding posts 11 to form a filter grid. The transparency of the transparent winding wire 12 is as close as possible to that of water.
[0049] In a preferred embodiment, the cross-section of the winding post 11 is a right-angled triangle, with its first right-angled face fixed to the frame 10 and its second right-angled face coplanar with the outer edge of the frame 10. The top edge of the second right-angled face has evenly spaced notches 13, which are used to limit the movement of the transparent winding thread 12. During the winding process, the transparent winding thread 12 can be wound back and forth around the notches 13 of the upper and lower winding posts 11, or wound at intervals of one or more notches 13 as required.
[0050] Furthermore, the inclined surface of the winding post 11 is provided with a winding pin 14. When winding, one end of the transparent winding thread 12 is fixed to the first winding pin 14 of the upper winding post 11, passes over the first notch 13 of the upper winding post 11, vertically passes over the notch 13 of the lower winding post 11 at the opposite position, then passes over the first winding pin 14 on the lower winding post 11, obliquely returns to another notch 13 on the lower winding post 11, vertically passes over the notch 13 of the upper winding post 11 at the opposite position, then passes over the second winding pin 14 on the upper winding post 11, obliquely returns to another notch 13 on the upper winding post 11, and so on.
[0051] By setting the winding nail 14, a filter screen that is parallel to each other and vertical can be formed by winding the line in the above manner. On the one hand, vertical winding is more conducive to the passage of small fish fry. On the other hand, the transparent winding line 12 can form a filter screen only on one side of the frame 10, saving the amount used on the other side, thus halving the amount of transparent winding line 12 used.
[0052] The usage method of this embodiment is as follows:
[0053] During the tilapia breeding season, catch-up devices are set up before the parent fish are introduced into the pond, and a light is installed in the fry collection box 1. The parent fish are then introduced into the pond. When small fry are found, they are promptly caught using standard methods. Some fry swim into the collection box 1 through a figure-eight-shaped entrance formed by the loose netting 2 and the solid netting 6. The fry are collected from the collection box 1 once a day. After a few days, some larger fry will appear. Unable to swim into the collection box 1, the larger fry will enter the fry collection area 3 through the passage 5 between the loose netting 2 and the collection box 1. The larger fry are periodically scooped out from the collection area 3. At night, the light in the collection box 1 is turned on to attract the fry, allowing for night-time catching.
[0054] Experiments show that when the above-mentioned fishing device was used in five breeding ponds of two mu each and four breeding ponds of one mu each, the fry production rate increased by 20% after the breeding season.
[0055] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model, and do not imply or require that the device or element referred to have a specific orientation or construction method, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish the objects of description and should not be construed as limiting importance or order, and the features defined by such terms may explicitly or implicitly include one or more of those features. Unless otherwise stated, "a plurality of" in the description of this utility model refers to two or more.
[0056] The terms "installation," "connection," and "joining" should be interpreted broadly, unless otherwise explicitly defined, to include, but are not limited to, fixed connections, detachable connections, or integrally formed connections; mechanical or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art can understand their meaning based on the specific technical solution. The fixed connections involved in this utility model, unless otherwise stated, include both detachable fixed connections (such as bolt and screw connections) and non-detachable fixed connections (such as riveting and welding), and may also include integral structures achieved through an integral forming process (such as casting) (except where integral forming is clearly impossible).
[0057] Unless otherwise stated, the terms used in any of the technical solutions disclosed in this utility model to indicate positional relationships or shapes cover states or shapes that are similar to, close to, or adjacent to them.
[0058] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.
[0059] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0060] In the embodiments of this application, the same reference numerals are used to denote the same component or part.
[0061] Any adaptive changes made according to actual needs are within the protection scope of this utility model.
[0062] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A device for catching rohu fry, characterized in that, include: A fry collection box (1) is set up in the aquaculture pond near the shore to collect small fish fry; At least two sets of stubble nets (2), one end of which extends to the bank (15) of the aquaculture pond and the other end is connected to the seedling collection box (1); The seedling collection area (3) is enclosed by the seedling collection box (1), the perforated net (2), and the bank (15) of the aquaculture pond, and is used to collect large fish fry; The filter section (4) is located on the side wall of the fry collection box (1) outside the fry collection area (3), allowing small fry to enter the fry collection box (1) and blocking large fry; The dotted net (2) and the seedling box (1) form a passage (5) for large fish fry to enter the seedling collection area (3).
2. The rohu fry catching device as claimed in claim 1, wherein: It also includes a solid net (6), one end of which is far from the shore, and the other end is connected to the side wall of the seedling collection box (1) located outside the seedling collection area (3).
3. The tilapia fry harvesting device according to claim 2, characterized in that: The filter section (4) is located on both sides of the seedling box (1) in a direction parallel to the bank (15) of the aquaculture pond; The sparse net (2) is connected to the nearshore side of the filter section (4) and forms the channel (5); The solid netting (6) is connected to the far shore side of the filter section (4).
4. The rohu fry catching device as claimed in claim 3, wherein: The dotted net (2) and the solid net (6) surround each other to form a figure-eight shaped channel.
5. The roe hatching fish larvae catching device according to any one of claims 1 to 4, characterized in that: The fry collection box (1) is equipped with a dense net (7) on the side wall except for the filter section (4) to prevent the fry from escaping.
6. The rohu fry catching device as claimed in claim 5, wherein: The filter section (4) and the mesh (7) are detachably connected.
7. The rohu fry catching device as claimed in claim 6, wherein: The filter section (4) is provided with a locking post (8), and the mesh (7) is provided with a retainer (9). The locking post (8) is inserted into the retainer (9) to achieve fixation.
8. The rohu fry catching device as claimed in claim 7, wherein: The filter section (4) includes a frame (10), with the locking posts (8) arranged on the left and right sides of the frame (10), and the winding posts (11) arranged at the top and bottom ends of the frame (10). A transparent winding thread (12) is wound between the two winding posts (11) to form a filter fence.
9. The rohu fry catching device as claimed in claim 8, wherein: The cross-section of the winding post (11) is a right triangle, with its first right-angled face fixed to the frame (10) and its second right-angled face coplanar with the outer edge of the frame (10); the top edge of the second right-angled face is provided with equally spaced notches (13), which are used to limit the transparent winding (12).
10. The rohu fry catching device as claimed in claim 9, wherein: The inclined surface of the winding post (11) is provided with a winding pin (14).