A comprehensive system for hatching drifting fish eggs

Abstract

A comprehensive system for hatching drifting fish eggs includes a culture tank, a flow control system, a roundabout real-time monitoring system, a stepped egg transfer system, an egg release system, an egg collection system, a tailwater collection platform, and a water storage tank. This system eliminates the influence of previous single-factor conditions on hatching, achieving the adjustability of influencing factors under different hatching environments, real-time tracking of the entire egg hatching process, and simulation of natural water flow conditions. During the hatching process, the system replaces the cumbersome operation of multiple manual egg releases in previous patents with a single, fully automated egg release process, thereby improving the egg hatching rate. Furthermore, to identify the drifting path patterns of the eggs during hatching, side-view and top-view egg drift monitoring systems and a hydraulic characteristics testing system are provided. The hatching drift distance of the eggs, as calculated by the monitoring system, can provide a reference for the fish species richness of the river's main stream and tributaries.

Description

Technical Field

[0001] The invention belongs to the technical field of aquaculture, and in particular relates to a comprehensive system for hatching drifting fish eggs. Background Art

[0002] The development of drifting eggs can be divided into four stages: embryonic development, larval development, juvenile development, and sexual maturity. Starting from the fertilized egg, after several days of incubation, the larvae emerge and break free from the ootheca. The embryonic development or incubation period is when the newly shed larvae absorb and utilize the yolk stored in the yolk sac. This period, from the disappearance of the yolk sac to the appearance of spines or soft rays on the fins, is called the "larval stage." Subsequently, the larvae are able to forage independently and gradually grow larger, but their reproductive organs have not yet matured, preventing them from engaging in reproductive activity. This is called the "juvenile stage" (also called the "juvenile stage"). Drifting eggs are those with a density similar to that of water, are non-viscous, and are separated from one another. After fertilization, they absorb water and expand upon contact with river water, becoming slightly heavier than water. Their particle size ranges from 1 to 2 mm. They easily sink in still water, leading to death from lack of oxygen. They must float or suspend on the surface of the water and drift in deeper, swifter waters for a certain distance to hatch before becoming larvae. This is exemplified by the eggs of the four common carps. In order to improve the hatching effect of fish eggs, studying the hatching rate of drifting fish eggs and the drifting movement patterns of fish eggs under different influencing factors is of great significance to the fishery resources of drifting fish, and also has reference value for the fish species richness and fish habitat adaptability in different river sections.

[0003] Currently, there are many methods for incubating drifting fish eggs. For example, patent application number CN211407268U discloses an elliptical fry incubation loop for the four major carps. This patent arranges a water spray pipe parallel to the bottom of the loop pool. However, due to the complex hydraulic conditions at the bottom of the loop, the water spray pipe cannot control the required flow rate when using the impact of water to drive the fish eggs in the loop. In addition, due to the fragility of fish eggs, the impact of water may cause damage to the fish eggs, thereby reducing the hatching effect of the fish eggs. There are also many studies on the influence of different factors on the hatching effect of fish eggs. For example, patent application number CN113519418B discloses a controllable hatching device for drifting fish eggs. The invention includes a hatching tank, a stirring system, a filter tank, a water storage tank and a regulating system. The invention forms a rotating micro-flow in the hatching tank to meet the required water flow through rotary stirring, but the rotary flow rate cannot be accurately controlled according to the required flow rate. At the same time, due to the irregular movement of the fish eggs, the fish eggs may be scratched on the outer wall of the stirring system, and the fish eggs and fry may be deposited in dead corners, causing mechanical damage and suffocation. Patent application number CN107156004 A discloses a fish egg movement experimental water tank system, including: a water reservoir, a rectangular water tank body, a rotary vane tailgate, an upstream water stop gate, a downstream water stop gate, a fish egg delivery slide car, a fish egg delivery lifting rod, an L-shaped fish egg delivery funnel, an L-shaped fish egg recovery funnel and a fish egg conveying device, wherein the fish egg conveying device can transfer the fish eggs recovered by the L-shaped fish egg recovery funnel to the L-shaped fish egg delivery funnel, and the water recovered by the L-shaped fish egg recovery funnel directly falls into the water reservoir. The invention realizes the functions of adjustable fish egg delivery amount and continuous delivery time, but the experimental water flow conditions of the patent are relatively single, and the optimal hatching flow rate value of the fish eggs cannot be accurately controlled, that is, the flow rate compatible with the fish egg movement cannot be controlled. In addition to the uniform water flow movement under a single environmental factor, the movement characteristics of the drifting fish eggs under the same natural water flow conditions (high turbulence, turbulent kinetic energy and water salinity, etc.) should also be studied as much as possible.

[0004] Existing experimental tanks for studying the locomotion characteristics of fish eggs have been found to have the following deficiencies: 1. The eggs must be released repeatedly, rather than being released once during an incubation cycle for automatic recovery and transport; 2. The eggs generate dirt during the incubation process, which, along with the shed egg membranes, is mixed into the water, resulting in a lack of a cleaning system during the incubation process; 3. Because drifting fish eggs and larvae must float or suspend on the water surface to develop, incubation must be divided into two periods: pre- and post-membrane detachment. Due to the influence of the egg membrane, the flow rate after detachment is greater than the flow rate before detachment. Fish eggs lack the ability to swim independently, while larvae after detachment have some ability to swim independently. No system for transporting eggs from pre-decapitation to larvae has been observed; 4. In addition to being affected by their own physiological characteristics, the hatching rate of fish eggs is also largely related to environmental factors (such as water temperature, flow rate, and salinity). However, current research on the locomotion characteristics of fish eggs is limited to a single environmental factor and a single control variable, preventing systematic research under multiple environmental factors and gradients. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a comprehensive system for hatching drifting fish eggs.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides a comprehensive system for hatching drifting fish eggs, comprising a culture tank, a flow rate control system, a roundabout real-time monitoring system, a stepped fish egg transport system, a fish egg releasing system, a fish egg collecting system, a tail water collecting platform and a water storage tank, wherein the culture tank is fixedly mounted on the tail water collecting platform, the water storage tank is arranged in the center of the tail water collecting platform, and the four culture tanks are all connected to the water storage tank; the culture tank is an annular tank, the flow rate control system comprises a connected propeller and a motor, and the propeller is arranged in the culture tank along the direction of water flow; the roundabout real-time monitoring system comprises a side-view monitoring high-definition camera system and a top-view monitoring high-definition camera system, the side-view monitoring high-definition camera system is mounted on the outer side wall of the culture tank, and the top-view monitoring high-definition camera system is mounted above the culture tank; the fish egg releasing system comprises a fish egg releasing platform, an arc-shaped slide and a fish egg releasing system. The fish egg release channel is provided on the inner ring wall of the culture tank, and there are two arc-shaped slides, which are respectively arranged on the left and right sides of the fish egg release platform. One end of the fish egg release channel is connected to the arc-shaped slide, and the other end passes through the inner ring wall of the culture tank and is connected to the culture tank; the fish egg collection system includes a fish egg collection pipe and an egg collection box at the end of the fish egg collection pipe, the fish egg collection box is provided at the bottom of the culture tank, and the top of the fish egg collection pipe is connected to the tank through the outer wall of the culture tank; the cascade fish egg transport system includes a fish egg conveyor belt, a fish egg shelf and a fish egg storage platform, one end of the fish egg conveyor belt is connected to the fish egg shelf, and the other end is connected to the fish egg storage platform, the fish egg shelf is provided on the fish egg release platform and is connected to the fish egg release platform; the fish egg storage platform is provided at the fish egg collection box and is connected to the fish egg collection box.

[0008] Furthermore, it also includes a water emptying device, which is arranged at the bottom of the culture tank and is a pipe connected to the water tank. A drain valve is installed on it. When the incubation process is completed, the water in the culture tank can be drained through the drain valve.

[0009] Furthermore, the flow rate control system also includes a trash rack, a propeller cover, an energy dissipation plate, a fixing rod and an external frame, and the external frame is fixed in the culture tank; there are multiple fixing rods, one end of which is fixedly connected to the external frame, and the other end is fixedly connected to the motor, fixing the motor in the external frame; the propeller cover is covered on the upper part of the external frame; the energy dissipation plate is fixedly connected to the bottom of the culture tank and is perpendicular to the bottom surface of the culture tank, and a groove is provided on the energy dissipation plate, and the trash rack is inserted into the groove of the energy dissipation plate.

[0010] Furthermore, it also includes a plurality of bluff bodies, which are detachably mounted on the inner wall of the culture tank, and the shape of the bluff body is any one of hemispherical, square and prismatic.

[0011] Furthermore, it also includes a cleaning window, which is arranged on the inner wall of the culture tank to collect dirt generated on the water surface during the incubation process and the egg membrane that falls off later. The grid of the cleaning window is cleaned and replaced regularly during the incubation process to keep the water quality in the culture tank up to standard.

[0012] Furthermore, the side-view monitoring high-definition camera system includes a side-view high-definition camera telescopic rod, a side-view telescopic rod base and a side-view monitoring track, and the top-view monitoring system includes a top-view high-definition camera system telescopic rod, a top-view telescopic rod base and a top-view monitoring track; the side-view monitoring track is fixed on the outer wall of the culture tank and is distributed in a ring shape along the outer wall of the culture tank, the side-view telescopic rod base is arranged on the side-view monitoring track and can slide along the side-view monitoring track, and the side-view high-definition camera telescopic rod is fixedly installed on the side-view telescopic rod base; the top-view monitoring track is arranged on the upper edge of the tank wall of the culture tank, the top-view telescopic rod base is arranged on the top-view monitoring track and can move along the top-view monitoring track, and the top-view high-definition camera system telescopic rod is installed on the top-view telescopic rod base.

[0013] Furthermore, the invention also includes a collecting door, which is arranged so that after the fish eggs pass through the collecting door, they will enter the pipeline and finally converge into the fish egg collecting box. Both ends of the fish egg collecting box are in a half-open state, one end opening is connected to the fish egg storage platform, and the other end opening is connected to the tail water collecting cone. The fish egg collecting box is provided with a soft water-permeable board, a water-permeable soft layer is fixed on the surface of the soft water-permeable board, and a circular hole with an aperture smaller than the particle size of the fish eggs is provided under the soft water-permeable board. The soft water-permeable board is arranged at an angle to ensure that the fish eggs entering the soft water-permeable board automatically slide into the fish egg storage platform along the slope.

[0014] Furthermore, there are multiple culture tanks, which are evenly distributed in a circular shape on the tail water collection platform.

[0015] Furthermore, the multiple culture tanks evenly distributed on the tail water collecting circular table are connected to the fish egg storage platform of the previous culture tank to the fish egg placing platform of the current culture tank in sequence by the fish egg conveyor belt along the transmission direction of the fish egg conveyor belt.

[0016] Furthermore, the water storage tank is divided into the same number of parts as the culture tanks by partitions, and each culture tank and the water storage tank exchange water through two connecting pipes, and the connecting pipes are equipped with valves.

[0017] The beneficial effects of the present invention are as follows: through implementation, a comprehensive system for monitoring the hatching rate of drifting fish eggs is provided. The system can adjust the hatching environment suitable for various types of drifting fish eggs according to different environmental factors, achieve the goal of releasing fish eggs only once during an incubation process, and after the eggs are hatched into fry under micro-flow conditions, they can be transported by a transport system to a culture tank with a higher flow rate for continued cultivation and behavioral research, completing the transition from the hatched fry stage to the juvenile stage. This also facilitates the subsequent cultivation of fish eggs under micro-flow conditions, and a cleaning window is provided for regular cleaning during this cycle. In order to identify the drifting path of fish eggs during the hatching process, side-view and top-view fish egg drift monitoring systems are respectively provided. The hatching drift distance of fish eggs calculated by the monitoring system can provide a reference for the fish species richness of the main stream and tributaries of the river. The device is portable, the operating conditions are not subject to external constraints, and the hatching process is controllable and can be monitored in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 Schematic diagram of the flow rate control system of the present invention;

[0020] Figure 3 It is a structural diagram of the high-definition camera system for overhead monitoring of the present invention;

[0021] Figure 4 It is a structural diagram of the side-view monitoring high-definition camera system of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the fish egg releasing system of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the fish egg collection system of the present invention;

[0024] Figure 7 This is a schematic structural diagram of the tailwater collecting truncated table and the water storage tank when connected to the present invention;

[0025] Figure 8 This is a schematic diagram of the flow field hydraulic characteristics testing system and measuring points of the present invention;

[0026] Figure 9 It is a probability density value curve diagram of the flow velocity adaptability and non-adaptability results during the fish egg drifting process of the present invention;

[0027] Figure 10 It is a flow rate preference curve diagram of the flow rate adaptability and non-adaptability results during the fish egg drifting process of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0029] like Figure 1-7As shown, a comprehensive system for hatching drifting fish eggs includes a culture tank 1, a flow rate control system 3, a roundabout real-time monitoring system 5, a stepped fish egg transport system 6, a fish egg releasing system 7, a fish egg collecting system 8, a tail water collecting platform 9 and a water storage tank 10. The culture tank 1 is fixedly mounted on the tail water collecting platform 9, the water storage tank 10 is arranged in the center of the tail water collecting platform 9, and the four culture tanks 1 are all connected to the water storage tank 10; the culture tank 1 is an annular tank, the flow rate control system 3 includes a connected propeller 31 and a motor 32, and the propeller 31 is arranged in the culture tank 1 along the direction of water flow; the roundabout real-time monitoring system 5 includes a side-view monitoring high-definition camera system 51 and a top-view monitoring high-definition camera system 52, the side-view monitoring high-definition camera system 51 is installed on the outer wall of the culture tank 1, and the top-view monitoring high-definition camera system 52 is installed above the culture tank 1; the fish egg releasing system 7 includes a fish egg releasing platform 71, an arc-shaped slide 72 and a fish egg releasing passage The egg releasing platform 71 is provided on the inner ring wall of the culture tank 1, and there are two arc-shaped slideways 72, which are respectively arranged on the left and right sides of the egg releasing platform 71. One end of the egg releasing channel 73 is connected to the arc-shaped slideway 72, and the other end passes through the inner ring wall of the culture tank 1 and is connected to the culture tank 1; the egg collecting system 8 includes an egg collecting pipe 81 and an egg collecting box 82 at the end of the egg collecting pipe 81. The egg collecting box 82 is provided at the bottom of the culture tank 1, and the egg collecting pipe 81 is provided at the bottom of the culture tank 1. The top of the channel 81 is connected to the interior of the culture tank 1 through the outer wall of the culture tank. The stepped egg transport system 6 includes an egg conveyor belt 61, an egg storage platform 62, and an egg storage platform 63. The egg conveyor belt 61 is connected to the egg storage platform 62 at one end and to the egg storage platform 63 at the other end. The egg storage platform 62 is located on the egg release platform 71 and is connected to the egg release platform 71. The egg storage platform 63 is located at the egg collection box 82 and is connected to the egg collection box 82. The system also includes a water drain device 2. The water drain device 2 is located at the bottom of the culture tank 1 and is a pipe connected to the water storage tank 10. A drain valve 21 is installed on the pipe. When the incubation process is completed, the drain valve 21 can be used to drain the water in the culture tank. The flow rate control system 3 also includes a cleaning rack 33, a propeller cover 34, an energy dissipation plate 35, a fixing rod 36 and an external frame 37. The external frame 37 is fixed in the culture tank 1. There are multiple fixing rods 36, one end of which is fixedly connected to the external frame 37 and the other end is fixedly connected to the motor 32, fixing the motor 32 in the external frame 37. The propeller cover 34 covers the upper part of the external frame 37. The energy dissipation plate 35 is fixedly connected to the bottom of the culture tank 1 and is perpendicular to the bottom surface of the culture tank 1. The energy dissipation plate 35 is provided with a groove, and the cleaning rack 33 is inserted into the groove of the energy dissipation plate 35. It also includes a cleaning window 22, which is provided on the inner wall of the culture tank 1 to collect dirt generated on the water surface during the incubation process and the egg membrane that falls off later. The grid of the cleaning window is regularly cleaned and replaced during the incubation process to keep the water quality in the culture tank up to standard.It also includes a plurality of bluff bodies 4, which are detachably mounted on the inner wall of the culture tank 1. The bluff body 4 has a shape of any one of hemispherical, square and prismatic.

[0030] The side-view monitoring high-definition camera system 51 includes a side-view high-definition camera telescopic rod 511, a side-view telescopic rod base 512 and a side-view monitoring track 513. The top-view monitoring system 52 includes a top-view high-definition camera system telescopic rod 521, a top-view telescopic rod base 522 and a top-view monitoring track 523. The side-view monitoring track 513 is fixed on the outer wall of the culture tank 1 and is distributed in a ring shape along the outer wall of the culture tank 1. The side-view telescopic rod base 512 is set on the side-view monitoring track 513 and can slide along the side-view monitoring track 513. The telescopic rod 511 of the clear camera is fixedly installed on the side-view telescopic rod base 512; the overhead monitoring track 523 is arranged on the upper edge of the tank wall of the culture tank 1, and the overhead telescopic rod base 522 is arranged on the overhead monitoring track 523 and can move along the overhead monitoring track 523. The telescopic rod 521 of the overhead high-definition camera system is installed on the overhead telescopic rod base 522, and the overhead telescopic rod base 522 is provided with a track perpendicular to the water flow direction of the culture tank 1. The telescopic rod 521 of the overhead high-definition camera system can move horizontally along the culture tank 1 on the track.

[0031] It also includes a collection door 811, which is arranged so that after the fish eggs pass through the collection door 811, they will enter the pipeline and finally converge into the fish egg collection box 82. Both ends of the fish egg collection box 82 are in a half-open state, one end opening is connected to the fish egg storage platform 63, and the other end opening is connected to the tail water collection frustum 9. A soft water-permeable plate 821 is provided in the fish egg collection box 82, and a water-permeable soft layer is fixed on the surface of the soft water-permeable plate 821. A circular hole 822 with an aperture smaller than the particle size of the fish eggs is provided under the soft water-permeable plate 821. The soft water-permeable plate 821 is arranged at an angle to ensure that the fish eggs entering the soft water-permeable plate 821 automatically slide into the fish egg storage platform 63 along the slope.

[0032] There are multiple culture tanks 1, evenly distributed in a circular shape on the tailwater collection platform 9. The multiple culture tanks 1 evenly distributed on the tailwater collection platform 9 are connected to the egg storage platform 63 of the previous culture tank 1 by the egg conveyor 61 along the conveying direction of the egg conveyor 61. The egg conveyor 61 connects the egg storage platform 63 of the previous culture tank 1 to the egg shelf 62 of the current culture tank 1 in sequence.

[0033] The water storage tank 10 is divided into the same number of parts as the culture tanks 1 by a partition 101. Each culture tank 1 exchanges water with the water storage tank through two connecting pipes 103, and the connecting pipes 103 are equipped with valves 1031.

[0034] When carrying out fish egg hatching, before the fish eggs are put into the culture tank and hatch, the emptying valve 21 is closed, the water inlet end of the connecting pipe 103 connecting the cylindrical water storage tank 10 and the culture tank 1 is opened, and the water supply in the culture tank is completed. After the water level in the water tank reaches the requirement, the water outlet end of the connecting pipe 103 is also opened thereupon, and the flow of the balancing water inlet end and the water outlet end is identical, which also ensures that the water in the culture tank is exchanged with the water body of the water storage tank in real time. The connecting position of the connecting pipe and the culture tank is at the bottom of the culture tank, and the water inlet and outlet end are equipped with an import and export dense net to avoid the hatching fish eggs from entering the water storage tank. The fish eggs float on the water surface, so the bottom connecting position can not have an impact on the hatching process. The water in the water storage tank 10 has been completed in advance by the unit control panel 102, and the key factors such as aeration, water quality optimization, oxygenation and water temperature are regulated. Therefore, the water flow does not need any processing in the culture tank 1 and can directly start the hatching process, thereby saving the hatching time. After the water in the culture tank 1 reaches the hatching depth, which is typically 80-90 cm to reduce distortion from the monitoring system's camera equipment, the flow rate is adjusted based on the rotational speed of the propeller 31 of the flow control system 3 to keep the water in the culture tank flowing. The processed fish eggs to be hatched are then slowly and sequentially placed into the egg release system 7. The eggs pass through the release platform 71, enter the slide, and then into the egg release channel 72. They then pass through the release channel control door 721 and finally slide into the culture tank.

[0035] When the system is running, a computer PC is connected to the overhead monitoring telescopic rod 521, and the lateral movement position and telescopic height of the overhead monitoring telescopic rod 521 on the overhead telescopic rod base 522 are controlled and adjusted by the PC.

[0036] Before the incubation process, the flow rate control system 3 can be used to control the flow rate in the culture tank in real time during the incubation process. The bluff body 4 can be removed or added according to the degree of water turbulence. The required degree of water turbulence can be determined by comparing and analyzing the incubation environment of natural river water bodies.

[0037] During the hatching process of the present invention, when the fish eggs drift along the water flow in the culture tank and are hatched, the loop-type real-time monitoring system 5, the test monitoring system 51 and the overhead monitoring system 52 monitor the movement of the fish eggs in real time according to their respective tracks, and synchronously store the fish egg movement information in real time.

[0038] In the hatching process of the present invention, a plurality of stepped water tanks are set, can study the hatching efficiency under different environments, also can complete the cultivation whole process from the fish egg hatching to the larval stage, juvenile stage and juvenile stage.After treating that each period is finished, can utilize the fish egg collecting system 8, the fish egg enters the fish egg collecting box 82 and finally arrives at the starting end of the conveyor belt 61 after through collecting pipe 81, arrives at the fish egg of terminal and places platform 62 through the transportation of conveyor belt 61, i.e. in the hatching water tank of next level.Because the fish egg places the tilting property of platform, arrive the fish egg that places the platform and can slowly slide into the arcuate slideway 72, finally completes the hatching process successively.

[0039] The energy dissipation plate 35 is configured as a detachable plate, which is connected to the bolts 331 provided at the bottom of the water tank. Removable energy dissipation plate cleaning racks 33 are provided at both ends of the energy dissipation plate 35. Grooves 332 are provided at both ends of the energy dissipation plate to facilitate the removal of the cleaning racks 33.

[0040] Among them, the flow rate control system 3, the motor 32 of the motor propeller 31 is protected by waterproof material to avoid safety accidents and extend the service life of the motor. In order to better fix the stability of the motor rotation, a fixing rod 36 with good rigidity is provided in the front and rear directions of the propeller. In order to prevent debris from entering the inside of the propeller, a cover plate 34 is provided on the top of the propeller, and a bolt 38 is provided at each of its four corners. The end of the bolt is connected to the top of the energy dissipation plate 35, which ensures the stability of the cover plate and will not be affected by the impact of water flow.

[0041] like Figure 7 As shown, the preferred scheme also includes a flow field hydraulic characteristic testing system 11. After the hatching of fish eggs is completed, the working conditions with better hatching effect (water temperature, flow rate and water salinity, etc.) are selected. After there are no fish eggs in the culture tank, the overhead high-definition camera is removed and replaced with a hydraulic testing instrument ADV (not shown in the figure) to test the water flow conditions during the hatching process. The telescopic length of the ADV (not shown in the figure) is adjusted to complete the monitoring of the hydraulic conditions of different water depth sections in the culture tank, and coupled with the drift route observed by the overhead monitoring system 52 to study the migration water flow characteristics during the hatching of fish eggs.

[0042] A plurality of measuring points 111 are set in the culture tank 1 to measure the flow velocity values in the longitudinal c (x coordinate, axial direction of the water tank, positive downstream), transverse v (y coordinate, perpendicular to the x direction) and vertical w (z coordinate, positive upward) directions. The section height of the measuring point 111 is based on the water depth of the drifting fish eggs, generally at 90-95% of the water depth. For example, if the water depth in the culture tank is 100 cm, the section height of the measuring point is 90-95 cm, the frequency of the measuring point is 50 Hz, the test time is 60 s, and the distance between each measuring point 111 is 3-5 cm, as shown by points (a), (b), (c), (d) and (e) of a certain section. After the measuring point data is processed by WinADV software, the instantaneous velocity can be decomposed into the time-averaged velocity and the pulsating velocity using the Surfer software drawing tool through the data processed by WinADV. The pulsating velocity can be calculated using the following formula:

[0043]

[0044] Where: c p ,v p ,w p is the pulsation velocity, cm / s; is the time-averaged velocity, cm / s; c, v, w are the instantaneous velocities, cm / s.

[0045] Then the velocity of each measuring point is:

[0046]

[0047] The calculation method of turbulent kinetic energy TKE and turbulent intensity of measuring point velocity is the same as above.

[0048] Then, the hatching trajectory of the fish eggs during hatching is coupled with the flow field, and the probability density analysis method is used to analyze the suitable flow field during the fish egg hatching process. The specific method is as follows:

[0049] When the fish eggs were hatching, the hydraulic parameter values corresponding to the hatching trajectory were extracted one by one based on the test and overhead monitoring system. The parameter values were divided into different hydraulic parameter intervals according to their size, and the probability density function curves of the different hydraulic parameters selected during the hatching process were constructed. Based on the hydraulic parameter values in the culture tank, the background probability density function curves of different hydraulic parameters were constructed using the same hydraulic parameter intervals. In order to analyze the hydraulic characteristics when showing selection and escape during the hatching process, the flow rate values were divided into different flow rate intervals, and the ratio of the area of each flow rate interval to the sum of the areas of the selected flow rate intervals was calculated. The ratio of each flow rate interval was subtracted from the area proportion of the flow rate and turbulence interval in the background flow rate and turbulence interval. When the difference is greater than 0, it is considered that the fish egg hatching is adaptable to this hydraulic parameter range, and less than 0 indicates non-adaptability.

Claims

1. A comprehensive system for hatching drifting fish eggs, characterized by: It includes a culture tank (1), a flow rate control system (3), a roundabout real-time monitoring system (5), a stepped fish egg transport system (6), a fish egg release system (7), a fish egg collection system (8), a tail water collection platform (9) and a water storage tank (10). The culture tank (1) is fixedly mounted on the tail water collecting truncated platform (9), the water storage tank (10) is arranged in the center of the tail water collecting truncated platform (9), and the four culture tanks (1) are all connected to the water storage tank (10); The culture tank (1) is an annular tank, and the flow rate control system (3) includes a propeller (31) and a motor (32) connected to each other, and the propeller (31) is arranged in the culture tank (1) along the direction of water flow; The island-type real-time monitoring system (5) comprises a side-view monitoring high-definition camera system (51) and a top-view monitoring high-definition camera system (52), wherein the side-view monitoring high-definition camera system (51) is installed on the outer side wall of the culture tank (1), and the top-view monitoring high-definition camera system (52) is installed above the culture tank (1); The fish egg release system (7) comprises a fish egg release platform (71), an arc-shaped slideway (72) and a fish egg release channel (73), wherein the fish egg release platform (71) is arranged on the inner ring wall of the culture tank (1), and there are two arc-shaped slideways (72), which are respectively arranged on the left and right sides of the fish egg release platform (71), and one end of the fish egg release channel (73) is connected to the arc-shaped slideway (72), and the other end passes through the inner ring wall of the culture tank (1) and is connected to the culture tank (1); the fish egg collection system (8) comprises a fish egg collection pipe (81) and a fish egg collection box (82) located at the end of the fish egg collection pipe (81), and the fish egg collection box (82) is arranged at the bottom of the culture tank (1), and the top end of the fish egg collection pipe (81) is connected to the tank through the outer wall of the culture tank (1); The cascade fish egg transport system (6) comprises a fish egg conveyor belt (61), a fish egg shelf (62) and a fish egg storage platform (63), wherein one end of the fish egg conveyor belt (61) is connected to the fish egg shelf (62), and the other end is connected to the fish egg storage platform (63), the fish egg shelf (62) is arranged on the fish egg release platform (71) and is in communication with the fish egg release platform (71); the fish egg storage platform (63) is arranged at the fish egg collection box (82) and is in communication with the fish egg collection box (82); The side-view monitoring high-definition camera system (51) includes a side-view high-definition camera telescopic rod (511), a side-view telescopic rod base (512) and a side-view monitoring track (513); the top-view monitoring high-definition camera system (52) includes a top-view high-definition camera system telescopic rod (521), a top-view telescopic rod base (522) and a top-view monitoring track (523); the side-view monitoring track (513) is fixed on the outer wall of the culture tank (1) and is distributed in a ring shape along the outer wall of the culture tank (1); the side-view telescopic rod base (512) is arranged at On the side-view monitoring track (513), it can slide along the side-view monitoring track (513), and the side-view high-definition camera telescopic rod (511) is fixedly installed on the side-view telescopic rod base (512); the top-view monitoring track (523) is arranged on the upper edge of the tank wall of the culture tank (1), and the top-view telescopic rod base (522) is arranged on the top-view monitoring track (523) and can move along the top-view monitoring track (523); the top-view high-definition camera system telescopic rod (521) is installed on the top-view telescopic rod base (522); The invention also includes a water flow emptying device (2), which is arranged at the bottom of the culture tank (1) and is a pipe connected to the water storage tank (10). A drain valve (21) is installed on the pipe. When the incubation process is completed, the water in the culture tank can be drained through the drain valve (21).

2. The integrated system for hatching drifting fish eggs according to claim 1, wherein: The flow rate control system (3) further includes a cleaning rack (33), a propeller cover (34), an energy dissipation plate (35), a fixing rod (36) and an external frame (37), wherein the external frame (37) is fixed in the culture tank (1); the fixing rod (36) is multiple, one end of which is fixedly connected to the external frame (37) and the other end is fixedly connected to the motor (32), so as to fix the motor (32) in the external frame (37); the propeller cover (34) covers the upper part of the external frame (37); the energy dissipation plate (35) is fixedly connected to the bottom of the culture tank (1) and is perpendicular to the bottom surface of the culture tank (1); a groove is provided on the energy dissipation plate (35), and the cleaning rack (33) is inserted into the groove of the energy dissipation plate (35).

3. The integrated system for hatching drifting fish eggs according to claim 1, wherein: It also includes a plurality of bluff bodies (4), which are detachably mounted on the inner wall of the culture tank (1), and the shape of the bluff body (4) is any one of a hemispherical, square and prismatic shape.

4. The integrated system for hatching drifting fish eggs according to claim 1, wherein: It also includes a cleaning window (22), which is arranged on the inner wall of the culture tank (1) and is provided with a grid.

5. The integrated system for hatching drifting fish eggs according to claim 1, wherein: The invention also includes a collecting door (811). After the fish eggs pass through the collecting door (811), they enter the pipeline and finally converge into the fish egg collecting box (82). Both ends of the fish egg collecting box (82) are in a half-open state. One end opening is connected to the fish egg storage platform (63), and the other end opening is connected to the tail water collecting truncated table (9). The fish egg collecting box (82) is provided with a soft water-permeable plate (821). A water-permeable soft layer is fixed on the surface of the soft water-permeable plate (821). A circular hole (822) with a hole diameter smaller than the fish egg particle diameter is provided under the soft layer. The soft water-permeable plate (821) is arranged obliquely to ensure that the fish eggs entering the soft water-permeable plate (821) automatically slide into the fish egg storage platform (63) along the slope.

6. The integrated system for hatching drifting fish eggs according to claim 1, wherein: The culture tanks (1) are multiple and evenly distributed in a circular shape on the tail water collecting cone (9).

7. The integrated system for hatching drifting fish eggs according to claim 6, wherein: The multiple culture tanks (1) evenly distributed on the tailwater collecting truncated table (9) are connected in sequence along the conveying direction of the fish egg conveyor belt (61) to the fish egg storage platform (63) of the previous culture tank (1) and the fish egg placing table (62) of the current culture tank (1) by the fish egg conveyor belt (61).

8. The integrated system for hatching drifting fish eggs according to claim 6, wherein: The water storage tank (10) is divided into the same number of parts as the culture tanks (1) by a partition (101). Each culture tank (1) and the water storage tank exchange water through two connecting pipes (103). The connecting pipes (103) are equipped with valves (1031).

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