Closed circulating water flowing device suitable for shellfish fry cultivation and use method

Abstract

The invention relates to a closed circulating water flowing device suitable for shellfish fry cultivation and a using method. Relates to the technical field of shellfish breeding and comprises a breeding pond, a screen basket, a transmission device and a recirculating aquaculture system, the screen basket is arranged in the breeding pond, a gear is arranged on the screen basket and connected with the transmission device, and a water inlet of the breeding pond is connected with the output end of the recirculating aquaculture system. And the water return end of the culture pond is connected with the inlet end of the circulating water culture system. Through water flow generated by the water inlet and rotation of the screen basket, the phenomenon of local high-density accumulation of larvae in the earlier stage of incubation and metamorphosis in a traditional breeding mode is eliminated. Meanwhile, clogging of the bait algae in the device is effectively avoided; when shellfish fry cultivation is completed, juvenile shellfish collection can be directly achieved by taking out the screen basket, and more convenience is achieved compared with a traditional collection mode.

Description

Technical Field

[0001] The present invention relates to the technical field of shellfish seed cultivation, and in particular to a closed circulating water flow device suitable for shellfish seed cultivation and a method for using the device. Background Art

[0002] Shellfish farming plays a vital role in China's aquaculture industry. According to the China Fisheries Statistical Yearbook, China's annual shellfish production is projected to exceed 16 million tons by 2024, accounting for nearly 30% of the country's total aquaculture output. Seedling cultivation, as the starting point and core link in the shellfish farming industry chain, directly impacts subsequent production efficiency and product quality.

[0003] Currently, the mainstream methods and supporting equipment for shellfish seed cultivation in my country are relatively backward. The cement tank-based cultivation model suffers from numerous drawbacks, including large floor space requirements, long water exchange intervals, and uneven distribution of bait algae. This leads to significant resource waste and low seed cultivation efficiency, which are becoming increasingly prominent. Therefore, optimizing shellfish larval cultivation methods based on the life history characteristics of commercial shellfish and improving seed production and quality have become urgent challenges in this field. There is a need to provide a new closed-circulation flow-through cultivation device for shellfish seed to address these issues. Summary of the Invention

[0004] To address the aforementioned technical issues, a closed-circulation water flow device suitable for shellfish seed cultivation and its use method are provided. This device separates shellfish larvae from the water treatment area by adding a powered screen basket to the cultivation pond. This allows for the recycling of aquaculture water while preventing the adhesion and accumulation of shellfish larvae and bait algae on the screen basket. This device aims to improve resource and space utilization, simplify manual operation processes, optimize seedling cultivation methods, and enhance seedling cultivation efficiency.

[0005] The technical means adopted in the present invention are as follows: A closed circulating water device suitable for shellfish seed cultivation comprises a breeding pond, a screen basket, a transmission device and a circulating water breeding system. The screen basket is placed in the breeding pond and is provided with a gear connected to the transmission device. The water inlet of the breeding pond is connected to the output end of the circulating water breeding system, and the return water end of the breeding pond is connected to the inlet end of the circulating water breeding system.

[0006] Furthermore, the circulating aquaculture system includes a sedimentation tank, a biological purification tank, an ultraviolet sterilization tank and an aeration tank connected in sequence, the sedimentation tank is connected to a return pipe, and the aeration tank is connected to a return pipe.

[0007] Furthermore, the sieve basket is a hollow structure, including an external frame and sieve silk, and the top of the external frame is a gear.

[0008] Furthermore, the sieve silk has a specification of 150-300 meshes and is wrapped around the bottom and surrounding of the external frame.

[0009] Furthermore, the transmission device includes a power device and at least one supporting gear to be connected thereto.

[0010] Furthermore, the supporting gear is mounted on a bottom base via a bracket, and the bottom base is fixed on the breeding pond.

[0011] Furthermore, the number of water inlets of the breeding pond is 5-10, which are evenly arranged on the side walls of the breeding pond.

[0012] The present invention also discloses a method for using the closed circulating water flow device suitable for shellfish seed cultivation, comprising the following steps: Fertilized shellfish eggs or planktonic larvae are placed in a screen basket in the breeding pond, the water circulation is started, and the screen basket is rotated along the central axis through a gear transmission device to prevent the larvae from accumulating due to directional water flow; the water circulation system is closed for a period of time after feeding the bait algae, and the water circulation is restarted after the density of the bait algae drops to the preset value.

[0013] Compared with the traditional shellfish larvae cultivation technology model, the closed circulation water cultivation device for shellfish seed provided by the present invention has the following main advantages: 1. In the closed-circulation water cultivation system, parameters such as temperature, pH, and flow rate can be artificially controlled to provide the most suitable and stable breeding environment for shellfish larvae; 2. The water flow generated by the water inlet and the rotation of the screen basket eliminate the local high-density accumulation phenomenon of larvae during hatching and the early stage of metamorphosis in traditional breeding models. At the same time, it effectively prevents the clogging of bait algae in the device; 3. When shellfish seed cultivation is completed, the juvenile shellfish can be collected directly by taking out the sieve basket, which is more convenient than the traditional collection mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1 This is a water circulation flow chart for a closed-loop water culture device for shellfish seed.

[0016] Figure 2 It is a schematic structural diagram of the screen basket and gear transmission device in the present invention.

[0017] In the figure: 1. Breeding pond; 2. Screen basket; 3. Transmission device; 4. Sedimentation tank; 5. Microfiltration machine; 6. Biological purification tank; 7. UV sterilization tank; 8. Oxygenation tank; 9. Circulation pump; 10. Circulating water pipe; 11. Water inlet; 12. Motor; 13. Support gear; 14. Bottom base. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0022] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0024] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0025] like Figure 1 、 Figure 2 As shown, an embodiment of the present invention discloses a closed circulating water flow device suitable for cultivating shellfish seedlings. The device comprises a breeding area and a water treatment area. Specifically, the device includes a breeding pond 1, a screen basket 2, a transmission device, and a recirculating aquaculture system. The screen basket 2 is placed in the breeding pond 1 and is provided with a gear connected to the transmission device 3. The water inlet 11 of the breeding pond 1 is connected to the output end of the recirculating aquaculture system, and the return water end of the breeding pond 1 is connected to the inlet end of the recirculating aquaculture system.

[0026] The screen basket of the present invention is connected to a transmission device via gears, enabling the screen basket to rotate in the water. This design allows the shellfish larvae to be evenly distributed within the screen basket, avoiding the localized accumulation of larvae caused by the direction of water flow in traditional models.

[0027] This invention achieves closed-loop, circulating water cultivation of shellfish seedlings by adding a gear-driven screen basket within the aquaculture tank. Compared to traditional shellfish seedling cultivation methods, this system improves water and bait utilization, effectively solving the problems of larval accumulation and algae clogging in existing closed-loop water cultivation of shellfish larvae, and reduces the incidence of disease. Furthermore, this device significantly reduces labor costs for managing shellfish larvae during cultivation and collecting them after they have grown. Furthermore, it allows for manual control of appropriate aquaculture environmental parameters during the larval cultivation process, improving aquaculture efficiency.

[0028] Furthermore, the recirculating aquaculture system includes a sedimentation tank 4, a biological purification tank 6, an ultraviolet disinfection tank 7, and an aeration tank 8, which are connected in sequence. The sedimentation tank is connected to a return pipe, and the aeration tank is connected to a return pipe. A microfilter 5 is provided in the sedimentation tank 4. Some waste particles collect at the bottom of the sedimentation tank 4 and are then discharged through the sedimentation tank drain pipe at the bottom. The remaining polluted particles are collected and discharged through the microfilter 5. The microfilter 5 is located in the sedimentation tank. After being filtered by the microfilter 5, the water enters the biological purification tank 6 through a circulation pump 9; the circulation pump 9 is located in the water tank where the output end of the microfilter 5 is located. The circulation of the circulating water is achieved through a circulating water pipe 10.

[0029] In the entire device, there is only one each of the culture pond 1, screen basket 2, gear transmission device 3, sedimentation tank 4, microfiltration machine 5, biological purification tank 6, ultraviolet disinfection tank 7 and aeration tank 8, and the number of circulating pumps 9 and circulating water pipes 10 is determined according to actual needs; Furthermore, the sieve basket 2 is a hollow structure, comprising an outer frame and sieve silk, wherein the top of the outer frame is a gear. The cultured shellfish larvae are placed in the sieve basket 2.

[0030] The culture pond 1 is square or circular. Preferably, the diameter or side length of the culture pond 1 is 1.5 m, the depth is 1.5 m, the diameter and depth of the screen basket are 1-1.2 m, and the screen silk specification is 150-300 mesh, which is wrapped around the bottom and four sides of the external frame.

[0031] Furthermore, the transmission device includes a power device and at least one supporting gear 13 to be connected, so as to realize the rotation of the screen basket 2 along the central axis in the aquaculture pond when the system is in operation. The power device is a motor 12. In this embodiment, the number of the supporting gears is four.

[0032] Furthermore, the support gear 13 is mounted on a bottom base 14 via a bracket, and the bottom base is fixed on the breeding pond.

[0033] Furthermore, the number of water inlets of the breeding pond 1 is 5-10, which are evenly arranged on the side wall of the breeding pond 1.

[0034] The rotation of the sieve basket and the water flow design of the circulating water system work together to prevent bait algae from clogging the sieve basket. The 150-300 mesh sieve ensures that bait algae can enter the sieve basket while preventing larvae from escaping. The sieve basket design allows for direct removal of the sieve basket for juvenile collection after spawning, simplifying the collection process.

[0035] The present invention also discloses a method for using the closed circulating water flow device suitable for shellfish seed cultivation, comprising the following steps: Fertilized shellfish eggs or planktonic larvae are placed in a screen basket in the breeding pond, the water circulation is started, and the screen basket is rotated along the central axis through a gear transmission device to prevent the larvae from accumulating due to directional water flow; the water circulation system is closed for a period of time after feeding the bait algae, and the water circulation is restarted after the density of the bait algae drops to the preset value.

[0036] The invention dynamically adjusts the distribution of larvae by opening the water circulation and rotating the screen basket. At the same time, the water circulation is temporarily closed after feeding the bait so that the bait algae can be evenly distributed and ingested by the larvae. The water circulation is then reopened to maintain water quality.

[0037] During use, the circulating water system is continuously running to keep the aquaculture water clean and stable. At the same time, according to the growth needs of shellfish larvae, water parameters such as temperature, pH and flow rate are artificially controlled to provide the larvae with the most suitable growth environment.

[0038] Preferably, the system is stopped for a period of time after the bait algae are fed, and an aeration device is placed in the screen basket 2 .

[0039] After feeding the bait algae, temporarily close the water circulation system to allow the bait algae to be evenly distributed in the screen basket. After the density of the bait algae drops to a certain level, reopen the water circulation to ensure that the larvae can fully ingest the bait and avoid excessive reproduction of the bait algae, which will lead to deterioration of water quality.

[0040] By controlling the rotation of the screen basket and the switch of the water circulation system, while ensuring the normal growth of the larvae, it is convenient for users to collect spat quickly and efficiently after the seedling rearing is completed, reducing losses during manual operation and collection.

[0041] The cylindrical frame of the screen basket 2 and the transmission device 3 are made of stainless steel or hard plastic, and the circulating water pipe 10 is made of PVC.

[0042] This device is replenished with water through the water reservoir to ensure the normal operation of the system.

[0043] In the above examples, different types of bait were fed according to the nutritional needs of the planktonic larvae, and the temperature and flow rate of the culture environment were adjusted to their optimal requirements. The optimal culture density for the planktonic larvae was 5 to 10 per mL. At this density, the average hatching rate exceeded 85%, the metamorphosis rate exceeded 82%, and the survival rate of the larvae after metamorphosis reached 80%.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A closed circulating water device suitable for shellfish seed cultivation, characterized in that: The invention comprises a breeding pond, a screen basket, a transmission device and a circulating water breeding system. The screen basket is placed in the breeding pond and is provided with a gear, which is connected to the transmission device. The water inlet of the breeding pond is connected to the output end of the circulating water breeding system, and the return water end of the breeding pond is connected to the inlet end of the circulating water breeding system.

2. The closed circulating water device suitable for shellfish seed cultivation according to claim 1 is characterized in that: The circulating aquaculture system comprises a sedimentation tank, a biological purification tank, an ultraviolet sterilization tank and an aeration tank which are connected in sequence. The sedimentation tank is connected to a return water pipe, and the aeration tank is connected to the return water pipe.

3. The closed circulating water device suitable for shellfish seed cultivation according to claim 1 is characterized in that: The sieve basket is a hollow structure, comprising an external frame and sieve silk, and the top of the external frame is a gear.

4. The closed circulating water device suitable for shellfish seed cultivation according to claim 3 is characterized in that: The sieve silk has a specification of 150-300 meshes and is wrapped around the bottom and four sides of the external frame.

5. The closed circulating water device suitable for shellfish seed cultivation according to claim 1 is characterized in that: The transmission device comprises a power unit and at least one supporting gear to be connected thereto.

6. The closed circulating water device suitable for shellfish seed cultivation according to claim 5, characterized in that: The supporting gear is mounted on a bottom base through a bracket, and the bottom base is fixed on the breeding pond.

7. The closed circulating water device suitable for shellfish seed cultivation according to claim 1, characterized in that: The number of water inlets of the breeding pond is 5-10, which are evenly arranged on the side wall of the breeding pond.

8. A method for using the closed circulating water device suitable for shellfish seed cultivation according to any of claims 1 to 7, characterized in that: The steps include: Fertilized shellfish eggs or planktonic larvae are placed in a screen basket in the breeding pond, the water circulation is started, and the screen basket is rotated along the central axis through a gear transmission device to prevent the larvae from accumulating due to directional water flow; the water circulation system is closed for a period of time after feeding the bait algae, and the water circulation is restarted after the density of the bait algae drops to the preset value.

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