Oyster larvae hatching device and hatching domestication method thereof

Abstract

The application discloses a striped jack fry hatching device and a hatching domestication method thereof, and aims to provide a striped jack fry hatching device and a hatching domestication method thereof, which are convenient to operate, can effectively reduce physiological stress and external abrasions of striped jack fry, and are favorable to improving the survival rate of the fry after releasing. The striped jack fry hatching device comprises a hatching net cage provided with a fry outlet on one side, vertical guide rods arranged on the left and right sides of the fry outlet, a telescopic net cover, a closing rope and a lifting rope.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Oplegnathus fasciatus fry breeding and releasing, in particular to an Oplegnathus fasciatus fry hatching device and a hatching domestication method thereof. BACKGROUND

[0002] Oplegnathus fasciatus is a kind of rocky fish with high edible, ornamental and ecological value, and it likes to live in rocky seabed areas, and often accompanies floating seaweed in the larva stage. Oplegnathus fasciatus fry refers to juvenile fish with a total length of ≥5 cm.

[0003] Oplegnathus fasciatus breeding and releasing is an important means to realize the conservation of Oplegnathus fasciatus fishery resources. Generally, the process of Oplegnathus fasciatus breeding and releasing includes indoor breeding in a pond, and when the fry reaches a certain body length specification, it is directly transferred to a designated location for release, or it is transferred to a coastal net cage for temporary breeding before release. During the process of transferring from the indoor breeding pond, the method of collecting fry by pulling the net in the pond is usually used. Taking the process of collecting fry in a rectangular breeding pond as an example, 3-4 people hold the net into the breeding pond, fully expand the net, slowly move from one end of the breeding pond to the other end, and gradually force the fry into the collection net by driving; another two people pull the two ends of the net on the left and right sides outside the breeding pond, and then pull up the net when the people in the pond reach the other end, so as to achieve the purpose of collecting fry.

[0004] The current method of collecting fry by pulling the net in the pond has the following disadvantages: first, the process of collecting fry by pulling the net may cause serious physiological stress and external scratches to the fry, which is not conducive to the survival rate of the fry after release; second, it often needs multiple people to work together to pull the net in the pond, which is inconvenient to operate. SUMMARY

[0005] The purpose of the present application is to provide an Oplegnathus fasciatus fry hatching device and a hatching domestication method, which not only is convenient to operate, but also can effectively reduce the physiological stress and external scratches to the Oplegnathus fasciatus fry, and is conducive to improving the survival rate of the fry after release.

[0006] The technical solution of the present application is:

[0007] An Oplegnathus fasciatus fry hatching device, comprising:

[0008] a hatching net cage provided with a fry outlet on one side, and vertical guide rods are arranged on the left and right sides of the fry outlet;

[0009] a telescopic net, the bottom edge of which is connected to the bottom edge of the fry outlet, and a plurality of pull rings are connected to the left and right sides of the telescopic net, wherein the pull rings on one side are sequentially sleeved on a vertical guide rod from top to bottom, and the pull rings on the other side are sequentially sleeved on another vertical guide rod from top to bottom;

[0010] The rope is used to pull up the stretchy net cover and block the exit of the fish fry.

[0011] The rope is used to pull up the stretchy net cover and block the exit of the fish fry.

[0012] The specific use of the device is as follows,

[0013] At a set time before the release of the fish fry, for example, one week before, the hatching net cage is placed in the fish fry culture pond.

[0014] The fish fry in the culture pond are domesticated by playing music and / or feeding bait into the hatching net cage, and the fish fry are domesticated for one week to promote them to enter the hatching net cage.

[0015] At the time of release, the stretchy net cover is pulled up by the rope to block the exit of the fish fry, and the hatching net cage is slowly lifted from the culture pond by the lifting rope, then the fish fry in the hatching net cage are moved into the transport tank and transferred to the designated location for release.

[0016] The device for collecting fish fry in the culture pond is easy to operate, even a single person can operate independently, and more importantly, the physiological stress of the fish fry is small during the collection process, which is not easy to cause scratches on the surface of the fish body, and is beneficial to improve the survival rate after release.

[0017] As a preferred embodiment, it further comprises:

[0018] A vertical guide column is arranged at the top of the hatching net cage, and a lifting frame stopper is arranged at the top of the vertical guide column.

[0019] The lifting frame is arranged to ascend and descend along the vertical guide column, and comprises a connecting frame arranged above the exit of the fish fry, wherein the lower end of the rope is connected to the upper edge of the stretchy net cover, the upper end of the rope is connected to the connecting frame, and the lifting rope is connected to the lifting frame.

[0020] When the lifting frame ascends along the vertical guide column and abuts against the lifting frame stopper, the rope pulls up the stretchy net cover and blocks the exit of the fish fry.

[0021] If the closing rope and the lifting rope are operated independently, when lifting the hatching net cage from the culture pond, the stretchy net cover needs to be pulled up and shield the fish fry exit first through the closing rope, and then the hatching net cage can be slowly lifted from the culture pond through the lifting rope, otherwise, during the lifting of the hatching net cage, the striped jack fry in the hatching net cage will escape, affecting the collection of the striped jack fry, and also easily causing the surface of the escaped fish to be scratched; in this way, not only the operation steps are increased, but also in the actual operation process, the operator may forget to pull up the stretchy net cover and shield the fish fry exit through the closing rope when lifting the hatching net cage, and directly lift the hatching net cage from the culture pond through the lifting rope, resulting in the striped jack fry in the hatching net cage escaping, affecting the collection of the striped jack fry, and causing the surface of the escaped fish to be scratched. In order to solve this problem, the striped jack fry hatching device is improved, and when the hatching net cage is lifted, only the lifting rope needs to be operated to lift the hatching net cage, and specifically,

[0022] When the hatching net cage is lifted, the hatching net cage is directly lifted by operating the lifting rope, in this process, the lifting rope first pulls the lifting frame up along the vertical guide column, in the process of pulling the lifting frame up along the vertical guide column, the lifting frame pulls the stretchy net cover up together through the closing rope, when the lifting frame abuts against the lifting frame stopper, the stretchy net cover shields the fish fry exit, after the lifting frame abuts against the lifting frame stopper, the lifting rope lifts the hatching net cage together through the lifting frame and the vertical guide column. In this way, not only can the operation steps when the hatching net cage is lifted be simplified, but also the problem that when the hatching net cage is lifted, the operator forgets to pull up the stretchy net cover and shield the fish fry exit through the closing rope, and directly lifts the hatching net cage from the culture pond through the lifting rope, resulting in the striped jack fry in the hatching net cage escaping, affecting the collection of the striped jack fry, and causing the surface of the escaped fish to be scratched can be effectively solved.

[0023] As a preferred, the lifting frame includes a sliding guide sleeve cooperating with the vertical guide column, and the sliding guide sleeve is located below the lifting frame stopper. In this way, it is ensured that the lifting frame can smoothly slide up and down along the vertical guide column.

[0024] As a preferred, the upper and lower ends of the vertical guide rod are respectively connected to the hatching net cage through connecting pieces, and the pull rings on the vertical guide rod are located between the connecting pieces at the upper and lower ends of the vertical guide rod. In this way, it is ensured that the stretchy net cover can be contracted downward or pulled up and expanded along the vertical guide rod.

[0025] As a preferred, the hatching net cage includes a net cage frame, the bottom surface, left and right side surfaces and rear surface of the net cage frame are provided with mesh or net plate, and the front surface of the net cage frame is open and forms the fish fry exit.

[0026] As preferred, the device further comprises a plurality of simulated seaweed suspending ropes and / or suspending meshes, the suspending ropes and / or the suspending meshes are located in the hatching net cage, and the lower ends of the suspending ropes and / or the suspending meshes are connected to the bottom surface of the hatching net cage. The device takes advantage of the ecological characteristics of O. striata that often accompanies with floating seaweed in the juvenile stage, and arranges the simulated seaweed suspending ropes and / or the suspending meshes in the hatching net cage, so as to efficiently make the O. striata fry gather in the gaps of the suspending ropes and / or the suspending meshes and around the same. The more the O. striata fry are disturbed, the more the O. striata fry gather in the range of the suspending ropes and / or the suspending meshes, thereby achieving a significant effect of gathering fish.

[0027] As preferred, the device further comprises:

[0028] a support frame;

[0029] a winding wheel, the winding wheel is rotationally arranged on the top of the support frame, the hoisting rope is wound on the winding wheel, and the hatching net cage is located below the winding wheel. In this way, the hoisting rope can be retracted or extended by rotating the winding wheel, so as to realize the operation of placing the hatching net cage into the O. striata fry culture pond or hoisting the hatching net cage from the O. striata fry culture pond, which is convenient to operate.

[0030] As preferred, the device further comprises a driving motor, the driving motor drives the winding wheel to rotate. In this way, the hoisting rope can be retracted or extended by driving the winding wheel to rotate through the driving motor, so as to realize the operation of placing the hatching net cage into the O. striata fry culture pond or hoisting the hatching net cage from the O. striata fry culture pond, which is further convenient to operate.

[0031] A method for hatching and domesticating O. striata fry, the method uses an O. striata fry hatching device to hatch and domesticate, and sequentially comprises the following steps,

[0032] placing the hatching net cage into the O. striata fry culture pond;

[0033] domesticating the O. striata fry in the culture pond by playing music through the domestication sound and / or feeding bait into the hatching net cage;

[0034] In each process of domesticating the O. striata fry in the culture pond by playing music through the domestication sound and / or feeding bait into the hatching net cage, the O. striata fry is adapted to the process of pulling up and lowering the retracting net cover through the repeated slow pulling up and lowering of the retracting net cover by the closing rope. Based on this, the O. striata fry can be adapted to the process of pulling up the retracting net cover through domestication; and in the process of pulling up the retracting net cover and shielding the fry exit and entrance through the closing rope when the hatching net cage is hoisted, the physiological stress on the O. striata fry can be effectively reduced, and the O. striata fry is prevented from escaping.

[0035] As preferred, the specific steps of domesticating the O. striata fry in the culture pond by playing music through the domestication sound and / or feeding bait into the hatching net cage are as follows,

[0036] The domestication sounder plays sound for t1 seconds, and then the bait is put into the hatching net cage, and the domestication sounder continuously plays sound during the bait putting process, and the domestication sounder plays sound for t2 seconds after the bait putting process.

[0037] The present application has the advantages of convenient operation, effectively reducing physiological stress and external scratches of the striped jack fry, and improving the survival rate of the fry after release. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a structural schematic view of a striped jack fry hatching device according to embodiment one of the present application.

[0039] Figure 2 is a partial enlarged view of A in Figure 1

[0040] Figure 3 is a structural schematic view of a striped jack fry hatching device according to embodiment three of the present application.

[0041] Figure 4 is a structural schematic view of a lifting frame according to embodiment three of the present application.

[0042] In the figure:

[0043] Hatching net cage 1, vertical guide rod 1.1, connecting piece 1.2;

[0044] Telescopic net 2, pull ring 2.1;

[0045] Closing rope 3;

[0046] Lifting rope 4;

[0047] Vertical guide column 5, lifting frame stopper 5.1;

[0048] Lifting frame 6, sliding guide sleeve 6.1. DETAILED DESCRIPTION

[0049] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0050] Embodiment one, as shown in Figure 1 , Figure 2 A striped jack fry hatching device includes a hatching net cage 1 with a fry exit on one side, a telescopic net 2, a closing rope 3, and a lifting rope 4.

[0051] A vertical guide rod 1.1 is arranged on the left and right sides of the fry exit. The vertical guide rod 1.1 is fixed on the hatching net cage 1.

[0052] ​The bottom edge of the stretchable net 2 is connected to the bottom edge of the fish fry outlet. A plurality of pull rings 2.1 are connected to the left and right side edges of the stretchable net 2. The pull rings 2.1 on one of the left and right side edges of the stretchable net 2 are sequentially sleeved on a vertical guide rod 1.1 from top to bottom, and the pull rings 2.1 on the other side edge are sequentially sleeved on another vertical guide rod 1.1 from top to bottom. Specifically, the pull rings 2.1 on the left side edge of the stretchable net 2 are sequentially sleeved on the vertical guide rod 1.1 on the left side of the fish fry outlet from top to bottom, and the pull rings 2.1 on the right side edge of the stretchable net 2 are sequentially sleeved on the vertical guide rod 1.1 on the right side of the fish fry outlet from top to bottom.

[0053] The closing rope 3 is connected to the upper edge of the stretchable net 2. The hoisting rope 4 hoists the fish fry net cage 1.

[0054] The specific use of the striped jack fry outlet device in the embodiment is as follows,

[0055] At a set time before the release of the striped jack fry, for example, one week before, the fish fry net cage 1 is placed in the striped jack fry culture pond;

[0056] The striped jack fry in the culture pond is domesticated by playing musical tones through a domestication sound and / or by feeding bait into the fish fry net cage 1, and the striped jack fry is domesticated for one week to promote the striped jack fry into the fish fry net cage 1.

[0057] At the time of release, the stretchable net 2 is pulled up by the closing rope 3 to block the fish fry outlet, the fish fry net cage 1 is slowly hoisted from the culture pond by the hoisting rope 4, then the striped jack fry in the fish fry net cage 1 is moved into a transport tank and transferred to a designated location for release.

[0058] The striped jack fry outlet device using the scheme collects the striped jack fry in the culture pond, which is convenient to operate and can be operated independently by one person. More importantly, the physiological stress of the striped jack fry is small during the collection of the striped jack fry, and the striped jack fry is not easy to scratch the surface of the fish body, which is beneficial to improve the survival rate after release.

[0059] Specifically, the fish fry net cage 1 includes a net cage frame. The bottom surface, left and right side surfaces, and rear surface of the net cage frame are provided with a mesh or a net plate. The front surface of the net cage frame is not arranged with a mesh or a net plate. The front surface of the net cage frame is open and forms the fish fry outlet. The top surface of the net cage frame can be arranged with a mesh or a net plate, or can not be arranged with a mesh or a net plate. In the embodiment, the top surface of the net cage frame is not arranged with a mesh or a net plate to facilitate feeding bait into the fish fry net cage 1.

[0060] In the embodiment, as shown in Figure 1 The hoisting rope 4 is directly connected to the top of the net cage frame of the fish fry net cage 1.

[0061] Further, asFigure 1 、 Figure 2 As shown in the figure, the upper and lower ends of the vertical guide rod 1.1 are connected with the emergence net cage 1 through the connecting pieces 1.2 respectively. In the embodiment, the upper and lower ends of the vertical guide rod 1.1 are connected with the net cage frame of the emergence net cage 1 through the connecting pieces 1.2 respectively. Each pull ring 2.1 on the vertical guide rod 1.1 is located between the connecting pieces 1.2 at the upper and lower ends of the vertical guide rod 1.1. In this way, it is ensured that the telescopic net cover 2 can be retracted downward or unfolded upward along the vertical guide rod 1.1.

[0062] Further, the striped jack fry emergence device further comprises a plurality of suspended ropes and / or suspended meshes simulating seaweed (not shown in the figure). The suspended ropes and the suspended meshes are located in the emergence net cage 1, and the lower ends of the suspended ropes and the suspended meshes are connected to the bottom surface of the emergence net cage 1. The suspended ropes and the suspended meshes are green. The suspended ropes and the suspended meshes can be suspended in water. The present scheme takes advantage of the ecological characteristics of striped jack that often accompanies floating seaweed in the larva stage, and arranges the suspended ropes and / or the suspended meshes simulating seaweed in the emergence net cage 1, which can efficiently make the striped jack fry gather in the gaps and around the suspended ropes and / or the suspended meshes simulating seaweed. The more external interference, the more the striped jack fry concentrate in the range of the suspended ropes and / or the suspended meshes simulating seaweed, which has a significant effect of gathering fish.

[0063] Specific embodiment two, a striped jack fry emergence domestication method, which uses a striped jack fry emergence device for emergence domestication. The specific structure of the striped jack fry emergence device is referred to the specific embodiment one.

[0064] A striped jack fry emergence domestication method, which comprises the following steps in sequence,

[0065] At a set time before the release of the striped jack fry, the set time is 5-10 days, the emergence net cage 1 is placed in the striped jack fry culture pond. The emergence net cage 1 is supported on the bottom surface of the striped jack fry culture pond through its bottom surface; the telescopic net cover 2 is stacked at the bottom of the emergence net cage 1 along the vertical guide rod 1.1, and the fry exit is in an open state.

[0066] The striped jack fry in the culture pond is domesticated by playing the tonal of the domestication sound and / or by feeding bait into the emergence net cage 1.

[0067] In each time of the process of domesticating the O. striata fry in the culture pond by the way of playing the sound by the domestication sound and / or putting the bait into the hatching net cage 1, the O. striata fry is adapted to the process of pulling up and lowering the stretch net 2 repeatedly and slowly through the mouth closing rope 3. Based on this, the O. striata fry can be adapted to the process of pulling up the stretch net 2 by domestication; thus, in the process of pulling up the stretch net 2 and shielding the exit of the fry by the mouth closing rope 3 when the hatching net cage 1 is hoisted, the physiological stress caused to the O. striata fry can be effectively reduced, and the O. striata fry can be prevented from escaping.

[0068] In the releasing process, the stretch net 2 is pulled up and shielded the exit of the fry by the mouth closing rope 3 first;

[0069] Then, the hatching net cage 1 is hoisted slowly from the culture pond by the hoisting rope 4;

[0070] Then, the O. striata fry in the hatching net cage 1 is moved into the transport water tank and transferred to the designated place for releasing.

[0071] The O. striata fry hatching domestication method of the embodiment is used to collect the O. striata fry in the culture pond, which is convenient to operate and can be operated independently by one person; more importantly, the physiological stress of the fry is small in the process of collecting the O. striata fry, and the fry is not easy to be scratched on the surface, which is beneficial to improve the survival rate after releasing.

[0072] Specifically, the specific time period of domesticating the O. striata fry in the culture pond by the way of playing the sound by the domestication sound and / or putting the bait into the hatching net cage 1 is as follows,

[0073] The O. striata fry in the culture pond is domesticated by the way of playing the sound by the domestication sound and / or putting the bait into the hatching net cage 1 at 06:00, 10:00, 14:00 and 18:00 every day, that is, the O. striata fry is domesticated 4 times a day with an interval of 4 hours.

[0074] The specific steps of domesticating the O. striata fry in the culture pond by the way of playing the sound by the domestication sound and / or putting the bait into the hatching net cage 1 are as follows,

[0075] The domestication sound is played for 10 seconds first, and then the bait is put into the hatching net cage 1, and the bait is put for 60 seconds; the domestication sound is continuously played in the process of putting the bait, and the domestication sound is played for another 30 seconds after the bait is put.

[0076] Specific embodiment three, as Figure 3 , Figure 4As shown, a striped seabream fry hatching device includes a hatching net cage 1 provided with a fry outlet on one side, a telescopic net 2, vertical guide posts 5 arranged on the top of the hatching net cage 1, a lifting frame 6 ascending and descending along the vertical guide posts 5, a closing rope 3 and a lifting rope 4.

[0077] A vertical guide post 1.1 is arranged on the left and right sides of the fry outlet. The vertical guide post 1.1 is fixed on the hatching net cage 1.

[0078] The bottom edge of the telescopic net 2 is connected to the bottom edge of the fry outlet. A plurality of pull rings 2.1 are connected to the left and right side edges of the telescopic net 2. The pull rings 2.1 on one side edge of the left and right side edges of the telescopic net 2 are sequentially sleeved on one vertical guide post 1.1 from top to bottom, and the pull rings 2.1 on the other side edge are sequentially sleeved on another vertical guide post 1.1 from top to bottom; specifically, the pull rings 2.1 on the left side edge of the telescopic net 2 are sequentially sleeved on the vertical guide post 1.1 on the left side of the fry outlet from top to bottom, and the pull rings 2.1 on the right side edge of the telescopic net 2 are sequentially sleeved on the vertical guide post 1.1 on the right side of the fry outlet from top to bottom.

[0079] The top of the vertical guide post 5 is provided with a lifting frame stopper 5.1. In this embodiment, the vertical guide post 5 is two, and the two vertical guide posts 5 are distributed on the left and right sides of the top of the hatching net cage 1. The lifting frame 6 includes a sliding guide sleeve 6.1 matched with the vertical guide post 5. The sliding guide sleeve 6.1 corresponds to the vertical guide post 5 one by one. The sliding guide sleeve 6.1 is located below the lifting frame stopper 5.1. In this way, it is ensured that the lifting frame 6 can smoothly slide up and down along the vertical guide post 5. The lifting frame 6 includes a connecting edge frame located above the fry outlet. The closing rope 3 is connected to the upper edge of the telescopic net 2, specifically, the lower end of the closing rope 3 is connected to the upper edge of the telescopic net 2, and the upper end of the closing rope 3 is connected to the connecting edge frame.

[0080] The lifting rope 4 lifts the hatching net cage 1, specifically, the lifting rope is connected to the lifting frame 6,

[0081] When the lifting frame 6 rises along the vertical guide post 5 and abuts against the lifting frame stopper 5.1, the closing rope 3 pulls the telescopic net 2 upward and blocks the fry outlet.

[0082] When the lifting frame 6 descends along the vertical guide post 5 and is supported on the top of the hatching net cage 1, the telescopic net 2 is stacked downward along the vertical guide post 1.1 on the bottom of the hatching net cage 1, and the fry outlet is in an open state.

[0083] The specific use of the striped seabream fry hatching device of this embodiment is as follows,

[0084] At a set time before the striped seabream fry is released, for example, one week before, the hatching net cage 1 is put into the striped seabream fry breeding pond;

[0085] The Oplegnathus fasciatus fry in the culture pond is domesticated by playing sound and / or feeding bait into the net box 1, and the Oplegnathus fasciatus fry is domesticated for one week to promote the Oplegnathus fasciatus fry into the net box 1.

[0086] When releasing, the stretch net 2 is pulled up by the closing rope 3 to block the outlet of the fry, and the net box 1 is slowly lifted from the culture pond by the lifting rope 4. Then, the Oplegnathus fasciatus fry in the net box 1 is moved into the transport tank and transferred to the designated place for releasing.

[0087] The Oplegnathus fasciatus fry releasing device can collect the Oplegnathus fasciatus fry in the culture pond, and the operation is convenient, and one person can operate independently. More importantly, the physiological stress of the fry is small during the collection of the Oplegnathus fasciatus fry, and the surface of the fish is not easy to scratch, which is beneficial to improve the survival rate after releasing.

[0088] On the other hand, the closing rope 3 and the lifting rope 4 in the first embodiment are operated independently. When lifting the net box 1 from the culture pond, the stretch net 2 is first pulled up by the closing rope 3 to block the outlet of the fry, and then the net box 1 is slowly lifted from the culture pond by the lifting rope 4. Otherwise, the Oplegnathus fasciatus fry in the net box 1 will escape during the lifting of the net box 1, which affects the collection of the Oplegnathus fasciatus fry and is easy to scratch the surface of the fish. Therefore, the operation steps are increased, and in the actual operation process, the operator may forget to pull up the stretch net 2 by the closing rope 3 to block the outlet of the fry when lifting the net box 1, and directly lift the net box 1 from the culture pond by the lifting rope 4, which causes the Oplegnathus fasciatus fry in the net box 1 to escape, affects the collection of the Oplegnathus fasciatus fry, and causes the surface of the escaped fish to be scratched. In order to solve this problem, the Oplegnathus fasciatus fry releasing device is improved in the embodiment. When lifting the net box 1, only the lifting rope 4 is operated to lift the net box 1, and specifically,

[0089] When the hatching net cage 1 is lifted, the hatching net cage 1 is directly lifted by operating the lifting rope 4. In this process, the lifting rope 4 first pulls the lifting frame 6 upward along the vertical guide column 5. In the process of pulling the lifting frame 6 upward along the vertical guide column 5, the lifting frame 6 pulls the telescopic net cover 2 upward together through the closing rope 3. When the lifting frame 6 abuts against the lifting frame stopper 5.1, the telescopic net cover 2 blocks the fry exit; after the lifting frame 6 abuts against the lifting frame stopper 5.1, the lifting rope 4 lifts the hatching net cage 1 together through the lifting frame 6 and the vertical guide column 5. In this way, not only can the operation steps when the hatching net cage 1 is lifted be simplified, but also the problem that the fry in the hatching net cage 1 escapes due to the operator forgetting to pull the telescopic net cover 2 upward and block the fry exit through the closing rope 3 when the hatching net cage 1 is lifted, directly lifting the hatching net cage 1 from the breeding pond through the lifting rope 4, affecting the collection of the striped jack fry, and causing the surface of the escaped fish to be scratched can be effectively solved.

[0090] Further, the striped jack fry hatching device further comprises a support frame, a winding wheel and a driving motor (not shown in the figure). The support frame is supported on the bottom surface of the striped jack fry breeding pond, or the support frame is supported on the ground where the striped jack fry breeding pond is located. The winding wheel is rotationally arranged at the top of the support frame. The driving motor drives the winding wheel to rotate. The lifting rope 4 is wound on the winding wheel, and the hatching net cage 1 is located below the winding wheel. In this way, the driving motor can be used to drive the winding wheel to rotate, so as to put the hatching net cage 1 into the striped jack fry breeding pond or lift the hatching net cage 1 from the breeding pond, which is convenient for operation.

[0091] Further, the hatching net cage 1 comprises a net cage frame. The bottom surface, left and right side surfaces and rear side surface of the net cage frame are provided with mesh or net plate. The front side surface of the net cage frame is not arranged with mesh or net plate. The front side surface of the net cage frame is open and forms the fry exit. The top surface of the net cage frame can be arranged with mesh or net plate, or can not be arranged with mesh or net plate. In the present embodiment, the top surface of the net cage frame is not arranged with mesh or net plate, so as to facilitate feeding bait into the hatching net cage 1.

[0092] The lower end of the vertical guide column 5 is connected with the net cage frame.

[0093] Further, the upper and lower ends of the vertical guide rod 1.1 are respectively connected with the hatching net cage 1 through the connecting pieces 1.2. In the present embodiment, the upper and lower ends of the vertical guide rod 1.1 are respectively connected with the net cage frame of the hatching net cage 1 through the connecting pieces 1.2. Each pull ring 2.1 on the vertical guide rod 1.1 is located between the connecting pieces 1.2 at the upper and lower ends of the vertical guide rod 1.1 (the structure of the vertical guide rod and the connecting piece in the present embodiment is consistent with that in the first specific embodiment). In this way, it is ensured that the telescopic net cover 2 can be contracted downward or expanded upward along the vertical guide rod 1.1.

[0094] Further, the striped jack fry hatching device further comprises a plurality of seaweed-simulating suspension ropes and / or suspension meshes (not shown in the figure). The suspension ropes and the suspension meshes are located in the hatching net cage 1, and the lower ends of the suspension ropes and the suspension meshes are connected to the bottom surface of the hatching net cage 1. The suspension ropes and the suspension meshes are green. The suspension ropes and the suspension meshes can be suspended in water. The present scheme takes advantage of the ecological characteristics of striped jack larvae often accompanying floating seaweed. The seaweed-simulating suspension ropes and / or suspension meshes are arranged in the hatching net cage 1, which can efficiently make the striped jack fry gather in the gaps and around the suspension ropes and / or suspension meshes. The more external interference, the more striped jack fry gather in the range of the suspension ropes and / or suspension meshes, which has a significant effect of gathering fish.

[0095] In a fourth embodiment, a striped jack fry hatching and domestication method is provided. The method uses a striped jack fry hatching device for hatching and domestication. The striped jack fry hatching device has the structure as described in the third embodiment.

[0096] The striped jack fry hatching and domestication method comprises the following steps in sequence,

[0097] At a set time before the release of the striped jack fry, the hatching net cage 1 is placed in the striped jack fry breeding pond. Specifically,

[0098] The driving motor drives the winding wheel to rotate, the hatching net cage 1 is placed in the striped jack fry breeding pond, the hatching net cage 1 is supported on the bottom surface of the striped jack fry breeding pond through its bottom surface, and the lifting frame 6 is lowered along the vertical guide column 5 and supported on the top of the hatching net cage 1. At this time, the telescopic net 2 is stacked on the bottom of the hatching net cage 1 along the vertical guide rod 1.1, and the fry exit is in an open state. Then, the driving motor stops working.

[0099] The striped jack fry in the breeding pond is domesticated by playing music with the domestication sound and / or feeding bait into the hatching net cage 1.

[0100] During each process of domesticating the striped jack fry in the breeding pond by playing music with the domestication sound and / or feeding bait into the hatching net cage 1, the telescopic net 2 is repeatedly and slowly pulled up and lowered by the closing rope 3, so that the striped jack fry can adapt to the process of pulling up the telescopic net 2. Based on this, the striped jack fry can be domesticated to adapt to the process of pulling up the telescopic net 2. Thus, when the hatching net cage 1 is lifted, the telescopic net 2 is pulled up and covers the fry exit by the closing rope 3, which can effectively reduce the physiological stress on the striped jack fry and avoid stimulating the striped jack fry to escape.

[0101] When releasing, the driving motor drives the winding wheel to rotate, and the hatching net cage 1 is lifted from the culture pond. During this process, the lifting rope 4 first pulls the lifting frame 6 upward along the vertical guide column 5. In the process of pulling the lifting frame 6 upward along the vertical guide column 5, the lifting frame 6 pulls the telescopic net cover 2 upward together through the closing rope 3. When the lifting frame 6 abuts against the lifting frame stop block 5.1, the telescopic net cover 2 blocks the fish fry outlet; after the lifting frame 6 abuts against the lifting frame stop block 5.1, the lifting rope 4 drives the hatching net cage 1 to be lifted together through the lifting frame 6 and the vertical guide column 5.

[0102] Then, the Oplegnathus fasciatus fry in the hatching net cage 1 is moved into the transport water tank and transferred to the designated place for releasing.

[0103] The Oplegnathus fasciatus fry in the culture pond is collected by using the Oplegnathus fasciatus fry hatching domestication method, which is convenient to operate and can be operated independently by one person; more importantly, the physiological stress of the fry is small during the collection of the Oplegnathus fasciatus fry, and the fish body surface is not easy to be scratched, which is beneficial to improve the survival rate after releasing.

[0104] Specifically, the specific time period for domesticating the Oplegnathus fasciatus fry in the culture pond by using the domestication sound to play the musical tone and / or feeding the bait into the hatching net cage 1 is as follows,

[0105] The Oplegnathus fasciatus fry in the culture pond is domesticated by using the domestication sound to play the musical tone and / or feeding the bait into the hatching net cage 1 at 06:00, 10:00, 14:00 and 18:00 every day, that is, domesticated 4 times a day with an interval of 4 hours.

[0106] The specific steps for domesticating the Oplegnathus fasciatus fry in the culture pond by using the domestication sound to play the musical tone and / or feeding the bait into the hatching net cage 1 each time are as follows,

[0107] The domestication sound plays the musical tone with an audio frequency of 350 Hz (taking advantage of the sensitivity of the Oplegnathus fasciatus fry to the audio frequency of 350 Hz), and the domestication sound is played for 10 seconds first, and then the bait is fed into the hatching net cage 1 for 60 seconds. The domestication sound is continuously played during the feeding of the bait, and the domestication sound is played for another 30 seconds after the feeding of the bait is completed.

[0108] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent transformation of the above embodiment according to the technical essence of the present application still belongs to the protection scope of the technical solution of the present application.

Claims

1. A device for hatching of Oplegnathus fasciatus fry, characterized in that, The device comprises: a hatching net cage with a fish fry outlet on one side, vertical guide rods on both sides of the fish fry outlet; a stretchable net cover with its bottom edge connected to the bottom edge of the fish fry outlet, a plurality of pull rings connected to the left and right edges of the stretchable net cover, each pull ring on one edge being sequentially sleeved on a vertical guide rod from top to bottom, and each pull ring on the other edge being sequentially sleeved on another vertical guide rod from top to bottom; a closing rope connected to the upper edge of the stretchable net cover; a lifting rope for lifting the hatching net cage; a vertical guide column arranged on the top of the hatching net cage, and a lifting frame stopper arranged on the top of the vertical guide column; a lifting frame which is lifted along the vertical guide column and comprises a connecting frame arranged above the fish fry outlet, the lower end of the closing rope being connected to the upper edge of the stretchable net cover, the upper end of the closing rope being connected to the connecting frame, and the lifting rope being connected to the lifting frame; when the lifting frame is lifted along the vertical guide column and stops on the lifting frame stopper, the closing rope pulls the stretchable net cover upward and covers the fish fry outlet.

2. The device for hatching of Oyster Catcher fry according to claim 1, wherein The lifting frame comprises a sliding guide sleeve matched with the vertical guide column, and the sliding guide sleeve is arranged below the lifting frame stopper.

3. The Oyster Catcher fish fry hatching device as claimed in claim 1 or 2, wherein, The upper and lower ends of the vertical guide rods are respectively connected to the hatching net cage through connecting members, and each pull ring on the vertical guide rod is arranged between the connecting members at the upper and lower ends of the vertical guide rod.

4. The Oyster Catcher fish fry hatching device as claimed in claim 1 or 2, wherein, The hatching net cage comprises a net cage frame, and the bottom surface, left and right side surfaces and rear surface of the net cage frame are provided with a mesh or a net plate, and the front surface of the net cage frame is open and forms the fish fry outlet.

5. The Oyster Catcher fish fry hatching device as claimed in claim 1 or 2, wherein, A plurality of simulated seaweed suspension ropes and / or suspension meshes are further arranged in the hatching net cage, and the lower ends of the suspension ropes and / or suspension meshes are connected to the bottom surface of the hatching net cage.

6. The Oyster Catcher fish fry escape apparatus as claimed in claim 1 or 2, further comprising The device comprises: a support frame; a winding wheel which is rotatably arranged on the top of the support frame, the lifting rope being wound on the winding wheel, and the hatching net cage being arranged below the winding wheel.

7. The Oyster Catcher fish fry harvesting device as claimed in claim 6, wherein, A driving motor is further arranged to drive the winding wheel to rotate.

8. A method for acclimating Oplegnathus fasciatus fry, characterized by, The method is performed by using the device for hatching and domesticating Oplegnathus fasciatus fry according to any one of claims 1-7, and sequentially comprises the following steps, putting the hatching net cage into a breeding pond of Oplegnathus fasciatus fry; playing a domestication sound and / or feeding bait into the hatching net cage to domesticate the Oplegnathus fasciatus fry in the breeding pond; in each process of playing the domestication sound and / or feeding bait into the hatching net cage to domesticate the Oplegnathus fasciatus fry in the breeding pond, the stretchable net cover is repeatedly and slowly pulled up and down by the closing rope, so that the Oplegnathus fasciatus fry can adapt to the process of pulling up the stretchable net cover.

9. The method for acclimation of Oyster larvae according to claim 8, wherein the method is characterized by, The specific steps of playing the domestication sound and / or feeding bait into the hatching net cage to domesticate the Oplegnathus fasciatus fry in the breeding pond are as follows, playing the domestication sound, playing the domestication sound for t1 seconds, then feeding bait into the hatching net cage, continuously playing the domestication sound during the feeding process, and playing the domestication sound for t2 seconds after the feeding is completed.

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