An Octopus sinensis larva cultivation device based on upwelling and its usage method

Abstract

The present invention relates to an Octopus sinensis larva cultivation device based on upwelling and a using method thereof, belonging to the technical field of aquaculture. The device includes a cultivation pond and a partition net. The cultivation pond is a cube or a cuboid. The partition net is arranged inside the cultivation pond and is perpendicular to the bottom surface of the cultivation pond. The water inlet pipe enters from the bottom of the cultivation pond, extends horizontally to the partition net, and the water inlet is oriented towards the other side of the partition net. The connection between the side wall and the bottom surface of the cultivation pond on this side is arc-shaped. The water outlet is arranged on the same side as the water inlet pipe and is located at the upper part of the cultivation pond. A sieve net is provided on the drain outlet, and an air stone is arranged at the bottom on the same side as the water inlet pipe. The present invention provides a using method of the device, which simulates the upwelling existing in the natural habitat of Octopus sinensis larvae, provides the necessary water flow stimulation for the growth and development of the larvae, and promotes the growth and bottom resting of the larvae.

Description

Technical Field

[0001] The present invention belongs to the technical field of aquaculture, and particularly relates to an Octopus sinensis larva cultivation device based on upwelling and a using method thereof. Background Art

[0002] Octopus sinensis is an important economic cephalopod along the coast of China and has great potential for aquaculture development. Octopus sinensis grows fast and is very suitable for large-scale breeding, but the current artificial breeding technology for Octopus sinensis has not yet been broken through.

[0003] The difficulty in Octopus sinensis breeding is that its larvae have a long bottom-resting process. It takes 1-2 months from the appearance of the bottom-resting phenomenon to complete bottom-resting, while there is no bottom-resting process in artificially bred species such as Sepia esculenta and Sepiella maindroni. Under the current artificial breeding conditions, the mortality rate of Octopus sinensis larvae during the bottom-resting process is almost 100%, which has become a technical bottleneck restricting the development of the Octopus sinensis aquaculture industry. Therefore, it is of great significance to develop breeding technologies and devices to improve the bottom-resting rate of larvae for the development of the Octopus sinensis aquaculture industry. Summary of the Invention

[0004] The present invention provides an Octopus sinensis larva cultivation device based on upwelling and a using method thereof. By simulating the upwelling existing in the natural habitat of Octopus sinensis larvae, water flow stimulation necessary for the growth and development of larvae is provided to promote the growth and bottom-resting of larvae.

[0005] The present invention is completed according to the following operation techniques:

[0006] An Octopus sinensis larva cultivation device based on upwelling includes a cultivation pool and a partition net. The cultivation pool is a cube or a cuboid. The partition net is arranged inside the cultivation pool and is perpendicular to the bottom surface of the cultivation pool. The water inlet pipe enters from the bottom of the cultivation pool, extends horizontally to the partition net, and the water inlet faces the other side of the partition net. The connection between the side wall and the bottom surface of the cultivation pool on this side is arc-shaped. The water outlet is arranged on the same side as the water inlet pipe and is located at the upper part of the cultivation pool. A screen is provided on the drain outlet, and an air stone is arranged at the bottom on the same side as the water inlet pipe.

[0007] Further, the partition net divides the cultivation pool into two symmetric parts on average.

[0008] Further, the water outlet direction of the water inlet is perpendicular to the partition net and the opposite side wall of the cultivation pool.

[0009] The present invention also provides a method for using the device, which is to assemble the device completely, let water enter from the water inlet, and the water entering the cultivation pool vertically rushes towards the opposite side of the partition net. After encountering the arc-shaped corner at the bottom surface, an upward upwelling will be formed; the partition net divides the cultivation pool into an upwelling area and a non-upwelling area. Open the aeration air stone in the non-upwelling area to oxygenate the water body; after the cultivation pool is full of water, adjust the water volume of the water inlet to make the upwelling force gentle; put the newly hatched juveniles of Octopus sinensis in the upwelling area, and the partition net can prevent the juveniles from swimming into the non-upwelling area, and start the cultivation of juveniles; according to the development process of the juveniles, feed nauplii of Artemia and mysids in sequence. When the number of suckers on the longest arm of the juveniles reaches 20, it indicates that the juveniles enter the bottoming stage at this time. Remove the partition net to enable the juveniles to bottom in the non-upwelling area; the bottoming process takes 1-2 months. During this process, the juveniles will constantly alternate between floating and bottoming states. When the juveniles are in the bottoming state for most of the time, it indicates that the juveniles have completely bottomed.

[0010] The beneficial effects of the present invention compared with the prior art: When the prior art uses upwelling to cultivate juveniles of Octopus sinensis, the upwelling is mainly generated by aerating with an air stone. Because the upwelling water body contains gas, the disturbance of the upwelling water body is relatively large, which is different from the upwelling in the natural habitat; at the same time, there is a lack of technical means to keep the juveniles in the upwelling area for a long time, and the juveniles are prone to gather in the non-upwelling area. The technical method provided by the present invention can generate an upwelling that simulates the natural habitat, and keep the juveniles in the upwelling area through a partition net, with a good water flow stimulation effect, and the bottoming rate can reach 13.6%-14.1%. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the device of the present invention;

[0012] Figure 2 is a schematic structural diagram of the partition net;

[0013] 1. Upwelling area, 2. Non-upwelling area, 3. Water inlet pipe, 4. Air stone, 5. Drainage port, 6. Card slot. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following further explains the technical solution of the present invention through examples, but the protection scope of the present invention is not limited by any form of the examples.

[0015] Example 1: An Octopus sinensis juvenile cultivation device based on upwelling, as Figure 1 and Figure 2As shown in the figure, the device includes a cultivation pond and a partition net. The cultivation pond is a cube, and the partition net is arranged inside the cultivation pond, perpendicular to the bottom surface of the cultivation pond. The water inlet pipe 3 enters from the bottom of the cultivation pond and extends horizontally to the partition net, with the water inlet facing the other side of the partition net. The connection between the side wall and the bottom surface of the cultivation pond on this side is arc-shaped. The water outlet is arranged on the same side as the water inlet pipe 3 and is located at the upper part of the cultivation pond. A sieve mesh is provided on the drain outlet 5, and an air stone 4 is arranged at the bottom on the same side as the water inlet pipe 3.

[0016] The partition net divides the cultivation pond into two symmetrically equal parts on average.

[0017] The water outlet direction of the water inlet is perpendicular to the partition net and the opposite side wall of the box.

[0018] The larval cultivation pond is made of fiberglass, approximately cube-shaped, with a side length of 90 cm. There is a card slot 6 for inserting and removing the partition net in the middle of the cultivation pond. There is 1 water inlet pipe 3 at the bottom of the side, and the water inlet of the water inlet pipe 3 leads directly to the card slot 6. There is 1 drain outlet 5 at the upper end on the same side as the water inlet pipe 3, and an 80-mesh sieve mesh is covered inside the drain outlet 5 to prevent the larvae from escaping. The connection between the bottom surface and the side wall of the cultivation pond on the side opposite to the water inlet is arc-shaped. The partition net is square, with a frame made of PVC material on the outer periphery and an 80-mesh sieve mesh in the middle.

[0019] The usage method of the device: Water enters from the water inlet. After the water entering the cultivation pond encounters the arc-shaped corner of the bottom surface, an upward upwelling will be formed. Insert the partition net into the card slot 6 of the cultivation pond to divide the cultivation pond into an upwelling area 1 and a non-upwelling area 2. Place an aerated air stone 4 in the non-upwelling area 2 to oxygenate the water body. After the cultivation pond is filled with water, adjust the water volume of the water inlet to make the upwelling force gentle. Put 2326 newly hatched Octopus sinensis larvae in the upwelling area 1. The partition net can prevent the larvae from swimming into the non-upwelling area 2, and start larval cultivation. The cultivation water temperature is 22 - 25 °C. According to the larval development process, nauplii of Artemia are fed from 0 to 15 days old, and then a mixture of nauplii of Artemia and mysids is fed. At 30 days old, the number of suckers on the longest arm of the larvae reaches 20. Remove the partition net, feed mysids as bait, observe daily, and promptly fish out the dead individuals. At 70 days old, most of the larvae are in a bottom-lying state. Count the number of larvae as 327, and the bottom-lying rate is 14.1%.

[0020] Example 2: The device used in this example is the same as that in Example 1. Put 1935 newly hatched Octopus sinensis larvae in the upwelling area. The cultivation water temperature is 25 - 27 °C. Nauplii of Artemia are fed from 0 to 13 days old, and then a mixture of nauplii of Artemia and mysids is fed. At 25 days old, the number of suckers on the longest arm of the larvae reaches 20. Remove the partition net, feed mysids as bait, and promptly fish out the dead individuals. At 62 days old, most of the larvae are in a bottom-lying state. Count the number of larvae as 243, and the bottom-lying rate is 13.6%.

[0021] Example 3: Except that there is no partition net in the middle, other devices of the present invention are the same as those in the example. 1862 newly hatched juveniles of Octopus sinensis are put into the cultivation pond. The cultivation water temperature is 25-27 °C. Artemia nauplii are fed to the juveniles at 0-13 days old, and then Artemia nauplii and mysids are fed in combination. At 25 days old, the number of suckers on the longest arm of the juveniles reaches 20. The partition net is removed, and mysids are fed as bait, and the dead individuals are fished out in time. At 60 days old, the number of juveniles lying on the bottom is counted as 16, and the lying-on-bottom rate is 0.9%.

Claims

1. A method for using a juvenile Octopus sinensis cultivation device based on upwelling, characterized in that, The device includes a cultivation pond and a partition net. The cultivation pond is a cuboid. The partition net is arranged inside the cultivation pond and is perpendicular to the bottom surface of the cultivation pond. The water inlet pipe (3) enters from the bottom of the cultivation pond, extends horizontally to the partition net, and the water inlet faces the other side of the partition net. The connection between the side wall and the bottom surface of the cultivation pond on this side is arc-shaped. The water outlet is arranged on the same side as the water inlet pipe (3) and is located at the upper part of the cultivation pond. A sieve is provided on the drain port (5), and an air stone (4) is arranged at the bottom on the same side as the water inlet pipe (3); The method is as follows: After assembling the device, water enters from the water inlet. The water entering the cultivation pond vertically rushes towards the opposite side of the partition net. After encountering the arc-shaped corner of the bottom surface, an upward upwelling will be formed. The partition net divides the cultivation pond into an upwelling area (1) and a non-upwelling area (2). Open the air stone (4) in the non-upwelling area (2) to oxygenate the water body. After the cultivation pond is full of water, adjust the water volume of the water inlet to make the upwelling force gentle. Put the newly hatched juveniles of Octopus sinensis in the upwelling area. The partition net can prevent the juveniles from swimming into the non-upwelling area (2), and start juvenile cultivation. According to the development process of the juveniles, nauplii of Artemia and mysids are fed in sequence. When the number of suckers on the longest arm of the juveniles reaches 20, it indicates that the juveniles enter the bottom-resting stage at this time. Remove the partition net to enable the juveniles to bottom-rest in the non-upwelling area (2). The bottom-resting process takes 1 to 2 months. During this process, the juveniles will constantly alternate between floating and bottom-resting states. When the juveniles are in the bottom-resting state for most of the time, it indicates that the juveniles have completely bottom-rested.

2. The method according to claim 1, wherein The partition net divides the cultivation pond into two symmetrically equal parts on average.

3. The method according to claim 1, wherein The water outlet direction of the water inlet is perpendicular to the partition net and the opposite side wall of the cultivation pond.

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