A device and method for collecting fertilized eggs of Channa ge's perch in an artificial pond

Abstract

The invention discloses a device and method for collecting fertilized eggs of an artificial pond of Channa ge's perch, so as to solve the problem that the existing method of collecting eggs of Channa ge's perch uses palm bark or waste tires, the palm bark and rubber tires have poor air permeability, the fertilized eggs die due to local lack of oxygen, and the egg collection efficiency is less than 30%. Device: The collecting device comprises a supporting frame (1) and an egg collecting trough (2), wherein the egg collecting trough (2) comprises a rectangular frame (21) and an egg collecting sheet (22), wherein the egg collecting sheet (22) is arranged at the bottom of the rectangular frame (21), wherein the supporting frame (1) is formed into a triangular frame by three supporting columns (11), wherein three cross bars (12) are arranged horizontally from top to bottom between every two supporting columns (11), wherein the three cross bars (12) divide the supporting frame (1) into two layers, namely an upper layer (13) and a lower layer (14), wherein the upper layer (13) is provided with 6 to 9 egg collecting troughs (2), and the lower layer (14) is provided with 9 to 15 egg collecting troughs (2). Method: 1. Processing the egg collecting sheet (22); 2. Assembling the egg collecting trough (2); 3. Assembling the collecting device; 4. Placing the collecting device; 5. Collecting fertilized eggs. The present invention is used for collecting fertilized eggs in artificial ponds of Channa ge's perch.

Description

Technical Field

[0001] The invention belongs to the field of aquaculture, and in particular relates to a device and a method for collecting fertilized eggs of Channa georgianus in an artificial pond. Background Art

[0002] Ge's Channa glenii (Perccottusglenii) belongs to the family Channidae, the genus Channidae, and is commonly known as the "old man fish". As a representative species of typical cold-resistant water fish. With the increasing recognition of the fish's commercial characteristics such as "delicious taste, few bones, tender meat, and unique taste", consumer demand is growing, and this fish has become a very potential special breeding object in the northern alpine regions. Since it is not easy to obtain sexual products through artificial squeezing of the abdomen of Ge's Channa glenii, on the basis of a clear study of the biological characteristics of fertilization of Ge's Channa glenii, it is suitable to use bionic methods to construct artificial fish nests to obtain the fertilized eggs of this fish.

[0003] Artificial egg collection methods already exist for other fish, but they are not applicable to Ge's Channa. For example, borrowing from the method of using "used tires" to collect eggs by loaches and other fish, Ge's Channa is prone to local hypoxia due to its large egg-laying capacity, which leads to more than 80% mortality before the fertilized eggs appear; for another example, borrowing from the method of collecting eggs from carp water bodies densely covered with "palm skin", Ge's Channa's Channa's bottom habitat habits and territorial behavior lead to extremely poor efficiency in collecting eggs (less than 30%). How to invent a technical method that can effectively guarantee the survival rate of Ge's Channa fertilized eggs and fully improve the utilization efficiency of egg collection sheets has become a key link that needs to be solved for the scale-up of this fish. Summary of the invention

[0004] The invention provides a device and method for collecting fertilized eggs of Channa ge's pond bass in an artificial pond in order to solve the problem that palm bark or waste tires are used to collect eggs of Channa ge's pond bass, the palm bark and rubber tires have poor air permeability, the fertilized eggs die due to local lack of oxygen, and the egg collection efficiency is less than 30%.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] A device for collecting fertilized eggs of Channa ge's perch artificial pond, the device comprising a support frame (1) and an egg collecting trough (2), the egg collecting trough (2) comprising a rectangular frame (21) and an egg collecting sheet (22), the egg collecting sheet (22) being arranged at the bottom of the rectangular frame (21), the support frame (1) comprising three support columns (11) forming a triangular frame, three cross bars (12) being arranged horizontally from top to bottom between every two support columns (11), the three cross bars (12) dividing the support frame (1) into two layers, namely an upper layer (13) and a lower layer (14), the upper layer (13) being provided with 6 to 9 egg collecting troughs (2), the lower layer (14) being provided with 9 to 15 egg collecting troughs (2), the angle α between the support column (11) and the cross bar (12) being 30° to 60°.

[0007] A method for collecting fertilized eggs of Channa ge's pond in an artificial pond is achieved by the following steps:

[0008] Step 1, treating the egg collecting sheet (22): using a dark nylon cloth sheet as the egg collecting sheet (22), soaking the nylon cloth sheet in boiling water for 1 hour, drying it until it is completely dry, and then soaking it in a 50ppm potassium permanganate solution for 30 minutes;

[0009] Step 2: Assembling the egg collecting tank (2): fixing the nylon cloth piece to the bottom of the rectangular frame (21) by means of pins;

[0010] Step 3, assembling the collection device: 2 to 3 egg collecting troughs (2) are arranged between the upper and lower cross bars (12) on each side of the upper layer (13), and 3 to 5 egg collecting troughs (2) are arranged between the upper and lower cross bars (12) on each side of the lower layer (14), and the egg collecting troughs (2) are fixed to the corresponding cross bars (12) by ropes at both ends;

[0011] Step 4: Place the collection device: Place the collection device in water, that is, insert the bottoms of the three support columns (11) into the mud;

[0012] Step 5, collecting fertilized eggs: After the collection device is placed, observe the collection device once every 2 to 3 days. When the fertilized eggs have eye spots, remove the egg collection tank (2) from the support frame (1) and move it into the hatching pond for hatching, waiting for all the fertilized eggs to break the membrane. At this point, the collection of fertilized eggs in the artificial pond of Channa ge's perch is completed.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention selects nylon cloth as the egg collection material. The air permeability of nylon cloth effectively solves the death problem caused by local hypoxia of fertilized eggs. The egg collection efficiency and water utilization rate are effectively improved through the design of the egg collection tank and the design of the angle of the PVC support frame. The egg collection device efficiently guarantees the batch collection of fertilized eggs of Channa ge's perch.

[0015] 2. The egg collecting trough has a high egg collecting effect. The experimental results show that the egg collecting efficiency is above 50%, while the egg collecting efficiency of the commonly used palm bark is below 30%.

[0016] 3. The present invention improves the utilization rate of water space. A pond with a bottom area of ​​200 square meters and a water depth of 1 meter is used as an egg collection pond. 300 groups of broodstock for egg collection (1 group: 1 female fish and 2 male fish) are placed, and 200,000 eyed eggs are obtained by using the device of the present invention, while the same 300 groups of broodstock spawning ponds only obtain 60,000 eyed eggs by the ordinary hanging palm skin method. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a device for collecting fertilized eggs of Channa ge’s perch in an artificial pond in the present application;

[0018] Figure 2 is a stereoscopic view of the egg collecting tank (2);

[0019] Figure 3 is a three-dimensional diagram of the support frame (1). DETAILED DESCRIPTION

[0020] Specific implementation method 1: Combination Figure 1 to Figure 3 The present embodiment is described. The present embodiment comprises a support frame 1 and an egg collecting trough 2. The egg collecting trough 2 comprises a rectangular frame body 21 and an egg collecting sheet 22. The egg collecting sheet 22 is arranged at the bottom of the rectangular frame body 21. The support frame 1 is composed of three support columns 11 to form a triangular frame body. Three cross bars 12 are horizontally arranged from top to bottom between every two support columns 11. The three cross bars 12 divide the support frame 1 into two layers, namely an upper layer 13 and a lower layer 14. The upper layer 13 is provided with 6 to 9 egg collecting troughs 2, that is, 2 to 3 egg collecting troughs 2 are arranged between the upper and lower cross bars 12 on each side of the upper layer 13. The lower layer 14 is provided with 9 to 15 egg collecting troughs 2, that is, 3 to 5 egg collecting troughs 2 are arranged between the upper and lower cross bars 12 on each side of the lower layer 14.

[0021] The angle α between the support column 11 and the cross bar 12 is 30° to 60°. If the angle between the support column 11 and the cross bar 12 is less than 30°, it is not convenient to observe the egg collecting tank 2, and if the angle between the support column 11 and the cross bar 12 is higher than 60°, the egg collection effect is extremely poor. The angle α between the support column 11 and the cross bar 12 is 45°. This angle has the best egg collection effect.

[0022] Specific implementation method 2: Combination Figure 1 to Figure 3 This embodiment is described, and this embodiment is implemented by the following steps:

[0023] Step 1, treating the egg collecting sheet 22: using a dark nylon cloth sheet as the egg collecting sheet 22, soaking the nylon cloth sheet in boiling water for 1 hour, drying it until it is completely dry, and then soaking it in a potassium permanganate solution with a concentration of 50ppm for 30 minutes;

[0024] Step 2: Assemble the egg collecting tank 2: fix the nylon cloth piece to the bottom of the rectangular frame 21 by pressing nails;

[0025] Step 3, assembling the collection device: 2 to 3 egg collecting troughs 2 are arranged between the upper and lower cross bars 12 on each side of the upper layer 13, and 3 to 5 egg collecting troughs 2 are arranged between the upper and lower cross bars 12 on each side of the lower layer 14, and the egg collecting troughs 2 are fixed to the corresponding cross bars 12 by ropes at both ends;

[0026] Step 4: Place the collection device: Place the collection device in the water, that is, insert the bottoms of the three support columns 11 into the mud; place a certain number of collection devices according to the area of ​​the water body and the number of spawning broodstock;

[0027] Step 5, collecting fertilized eggs: After the collection device is placed, the collection device is observed once every 2-3 days. When the fertilized eggs have eyespots, the egg collection tank 2 is taken out from the support frame 1 and moved into the hatching pool for hatching, and the fertilized eggs are waited for all the membranes to break. At this point, the fertilized eggs in the artificial pond of Channa ge's perch are collected. After the fertilized eggs are collected, the egg collection sheet 22 is removed and cleaned and aired, and no fishy smell is left to prevent ants and mice from destroying them. At the same time, the support frame 1 is disassembled and cleaned, and all components are collected for next use.

[0028] In step three, four egg collecting troughs 2 are arranged between the upper and lower cross bars 12 on each side of the lower layer 14 .

[0029] Four different egg collection materials, including waste tires, hollow bricks, palm skin and nylon cloth, were selected for the egg collection experiment:

[0030] The experiment selected two evaluation indicators, attachment rate (%) and embryo eye rate (%), for comparison. 30 egg tanks were set for each egg collection material. The experimental results are shown in Table 1:

[0031] Table 1

[0032]

[0033]

[0034] From the experimental results in Table 1, it can be seen that the hollow brick group had the worst attachment rate and eye-opening rate, while the waste tire and palm skin were in the middle. The group with the highest embryo eye-opening rate appeared in the palm skin group, but there was no significant difference between the nylon cloth group and the palm skin group (p<0.05), while the embryo eye-opening rates of the other two groups were significantly reduced (p<0.05). This is due to the poor air permeability of tires and hollow bricks and the poor fluidity of local water bodies, which led to the death of fertilized egg embryos due to lack of oxygen. Conclusion: "Nylon cloth" is the best material for making egg collection troughs as egg collection sheets.

[0035] Experiment with the selected egg collecting tank:

[0036] The size of the egg collection tank was optimized. Based on the known size range of the broodstock of Channa ge's perch (18cm-26cm) and the attachment area of ​​the fertilized eggs they produced (14--30cm 2 ) size to design the corresponding egg collection tank size range. A rectangular frame 21 made of wooden squares is made of wooden boards around it, with an open top and an egg collection sheet fixed at the bottom. The egg collection sheet is a nylon cloth sheet. The experimental results are shown in Table 2:

[0037] Table 2

[0038]

[0039] The experimental results in Table 2 show that it is not easy for G. ge's pond snakehead to lay eggs in a relatively open egg-laying trough (40X60X10cm), and a smaller egg-laying trough is not suitable because it easily causes the fertilized eggs to overflow the egg-collecting cloth. Therefore, the size of the egg-laying trough is easily controlled between 20X30X10cm and 30X50X10cm.

[0040] Experiment with the selected support frame:

[0041] Considering the biological characteristics of the "bottom-dwelling, hidden spawning, and egg protection" of the Ge's perch, an experiment was designed to verify the effect of the egg collection tank placement angle on the egg collection effect in the water body. The experimental results are shown in Table 3:

[0042] Table 3

[0043]

[0044] The experimental results in Table 3 show that almost no fish spawned in the collection ovaries placed vertically in the water body, and as the collection ovaries angle decreased, the egg collection efficiency increased significantly. Considering the operability of the underwater probe during actual production observation, the angle of the egg collection tank is recommended to be set within the range of 30°--60°.

Claims

1. A device for collecting fertilized eggs of Channa ge's perch in an artificial pond, characterized in that: The collecting device comprises a support frame (1) and an egg collecting trough (2), the egg collecting trough (2) comprising a rectangular frame (21) and an egg collecting sheet (22), the egg collecting sheet (22) being arranged at the bottom of the rectangular frame (21), the support frame (1) being composed of three support columns (11) forming a triangular frame, three cross bars (12) being arranged horizontally from top to bottom between every two support columns (11), the three cross bars (12) dividing the support frame (1) into two layers, namely an upper layer (13) and a lower layer (14), the upper layer (13) being provided with 6 to 9 egg collecting troughs (2), the lower layer (14) being provided with 9 to 15 egg collecting troughs (2), the angle α between the support column (11) and the cross bar (12) being 30° to 60°; Two to three egg collecting grooves (2) are arranged between the upper and lower cross bars (12) on each side of the upper layer (13), and three to five egg collecting grooves (2) are arranged between the upper and lower cross bars (12) on each side of the lower layer (14), and the egg collecting grooves (2) are fixed to the corresponding upper and lower cross bars (12) by means of tethers at both ends.

2. A method for collecting fertilized eggs from an artificial pond of Channa guerrei using the device for collecting fertilized eggs from an artificial pond of Channa guerrei according to claim 1, characterized in that: The method is achieved by the following steps: Step 1, treating the egg collecting sheet (22): using a dark nylon cloth sheet as the egg collecting sheet (22), soaking the nylon cloth sheet in boiling water for 1 hour, drying it until it is completely dry, and then soaking it in a 50 ppm potassium permanganate solution for 30 minutes; Step 2, assembling the egg collecting tank (2): fixing the nylon cloth piece to the bottom of the rectangular frame (21) by means of pins; Step 3, assembling the collection device: 2 to 3 egg collecting troughs (2) are arranged between the upper and lower cross bars (12) on each side of the upper layer (13), and 3 to 5 egg collecting troughs (2) are arranged between the upper and lower cross bars (12) on each side of the lower layer (14), and the egg collecting troughs (2) are fixed to the corresponding upper and lower cross bars (12) by using tethers at both ends; Step 4: Place the collection device: Place the collection device in water, i.e. insert the bottoms of the three support columns (11) into the mud; Step 5, collecting fertilized eggs: After the collection device is installed, the collection device is observed once every 2 to 3 days. When the fertilized eggs have eye spots, the egg collecting tank (2) is removed from the support frame (1) and moved into the hatching pond for hatching, and the fertilized eggs are waited for to break the membrane. At this point, the collection of fertilized eggs in the artificial pond of Channa ge's perch is completed.

3. The method for collecting fertilized eggs of Channa ge's pond artificial pond according to claim 2, characterized in that: The method is implemented by the following steps: In step 3, four egg collecting troughs (2) are arranged between the upper and lower cross bars (12) on each side of the lower layer (14).

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