A method for culturing of coreius heterolomus in the opening stage

Abstract

The application discloses a kind of copper fish fry open stage's cultivation method, its steps are as follows: S1, after waiting for copper fish fry all level swim, copper fish fry is transferred into cultivation bucket and is cultivated;S2, the day of being put into cultivation bucket, remove the eggshell and unhatched egg in the artemia incubator, then the artemia is released;S3, filter artemia with filter device, filter device includes first filter screen bag and second filter screen bag, when filtering, first filter screen bag net clothes is placed in second filter screen bag, then the artemia released from incubator is put into first filter screen bag net, and is washed with water, after filtering, first filter screen bag is removed, and the artemia in second filter screen bag is collected;S4, the collected artemia is fed to copper fish fry, after copper fish fry opens mouth, continue to feed artemia for 15-20d;S5, then feed artificial compound feed.The method step is simple, easy to operate, significantly improves the opening rate of copper fish fry open stage, and breaks through the technical bottleneck of copper fish opening.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of Coreius heterodon breeding, and particularly relates to a method for breeding Coreius heterodon fry in the opening stage. BACKGROUND

[0002] Coreius heterodon (Bleeker) belongs to Coreius of Gobioninae of Cyprinidae of Cypriniformes, and is commonly known as gold eel, sharp-headed stick, and oil copper, etc. It is a species endemic to the Yangtze River, and is distributed in the main stream and tributaries of the Yangtze River. It was once an important economic fish and dominant fish in the Yangtze River basin. Due to water engineering construction, overfishing, and environmental deterioration, the resource of Coreius heterodon has been rapidly reduced, and is listed in the List of Key Protected Aquatic Wildlife in Jiangsu Province (the first batch) and the List of National Key Protected Economic Aquatic Wildlife Resources (the first batch).

[0003] Coreius heterodon has high fat content, delicious taste, and high nutritional value, and has high development value and broad market prospect. The artificial domestication and breeding technology of Coreius heterodon has been successful. At present, due to the technical bottleneck of the opening stage breeding technology, the opening rate of Coreius heterodon fry is low.

[0004] The fry opening bait mainly includes natural bait and artificial bait, wherein the natural bait mainly includes animal bait such as rotifer, water worm, and artemia, and the artificial bait mainly includes egg yolk and artificial compound feed. When the artificial bait is used as the opening bait for Coreius heterodon, the opening rate is lower than 20%, and when the egg yolk is used as the opening bait, it is easy to cause water quality deterioration. Among the animal bait, the rotifer is not suitable for factory cultivation. The water worm can basically meet the nutritional needs of fish and shrimp growth and development, but when the water worm is used as the opening bait for Coreius heterodon, it needs to be crushed by a food processor before being fed, which is easy to cause water quality deterioration. The artemia has high nutritional value, simple and easy-to-operate hatching mode, is a living body when being fed, and has less influence on water quality, and is a more suitable opening bait for factory breeding.

[0005] At present, the public feeding operation method of artemia as the opening bait is that after the egg shell and un-hatched eggs in the artemia hatcher are removed, the artemia is directly fed to the flat-swimming fry after being put out from the hatcher. However, when this artemia feeding operation method is used for the breeding of Coreius heterodon in the opening stage, the opening rate of Coreius heterodon is low, and is all lower than 20%. SUMMARY

[0006] Based on the above prior art, the present application provides a method for breeding Coreius heterodon fry in the opening stage. The method is simple, convenient to operate, significantly improves the opening rate of Coreius heterodon fry in the opening stage, and breaks through the technical bottleneck of the breeding technology of Coreius heterodon in the opening stage.

[0007] The technical scheme adopted to achieve the above-mentioned purpose of the present application is:

[0008] A method for culturing juvenile copper fish in the mouth opening stage, comprising the following steps:

[0009] S1, after all the copper fish fry in the incubation facility swim horizontally, the copper fish fry are transferred into a breeding barrel of an indoor seedling cultivation facility for cultivation, and the stocking density is 8000-10000 tails / m 3 ;

[0010] S2, on the day when the copper fish fry are put into the breeding barrel, the eggshells and unhatched eggs in the artemia incubator are removed, and then the artemia are released;

[0011] S3, filtering the artemia with a filtering device, the filtering device comprising a first filter mesh bag and a second filter mesh bag, the first filter mesh bag having a mesh hole with an outer circle diameter of 0.5-0.8mm, and the second filter mesh bag having an outer circle diameter of 0.13-0.20mm;

[0012] During the filtering, the first filter mesh bag is placed in the second filter mesh bag, and then the artemia released from the incubator are put into the first filter mesh bag, and the filtering is performed by washing with water, after the filtering is completed, the first filter mesh bag is taken out, and the artemia in the second filter mesh bag are collected;

[0013] S4, feeding the copper fish fry with the artemia collected in step S3, feeding 3-4 times per day, and the amount of artemia fed each time is 5-10 pieces / mL of water body, and after the copper fish fry open their mouths, the feeding of artemia is continued for 15-20 days;

[0014] S5, then feeding artificial compound feed, feeding 2-3 times per day, and the daily feeding amount is 4%-6% of the body weight of the copper fish fry.

[0015] Further, the diameter of the breeding barrel is 0.5-2m, and the water depth is 0.4-0.6m.

[0016] Further, the breeding water is aeration tap water, well water or mountain spring water meeting the requirements of the Fishery Water Quality Standard (GB11607-89), wherein the dissolved oxygen is 6.2-10.98mg / L, the pH is 7.6-8.0, the ammonia nitrogen is 0.035-0.075mg / L, and the nitrite nitrogen is 0.003-0.01mg / L.

[0017] Further, the water temperature during the mouth opening cultivation stage of the copper fish fry is 22-24℃, and the light intensity is 0-456Lux.

[0018] Further, the first filter bag and the second filter bag are both circular truncated cone, the first filter bag mouth and the bag bottom are both circular, the diameter of the first filter bag mouth is larger than the diameter of the first filter bag bottom, the second filter bag mouth and the bag bottom are both circular, the diameter of the second filter bag mouth is larger than the diameter of the second filter bag bottom, the height of the first filter bag is smaller than the height of the second filter bag.

[0019] Further, the filter device further comprises a support, the support comprises four supporting legs and a supporting table, the upper ends of the four supporting legs are fixedly connected with the supporting table, a working hole is arranged in the center of the supporting table, the inner diameters of the first filter bag mouth and the second filter bag mouth match the diameter of the working hole of the working table, a first handle is arranged on the first filter bag mouth, and a second handle is arranged on the second filter bag mouth.

[0020] Further, in the step S3, the Daphnia that cannot pass through the first filter mesh can be used as bait for other fish after filtration.

[0021] Further, in the step S4, the Daphnia is fed 4 times a day, and the feeding time is divided into 8:00, 12:00, 16:00 and 20:00.

[0022] Further, in the step S5, the Daphnia is fed 2 times a day, and the feeding time is 8:00 and 18:00 respectively.

[0023] Further, in the opening cultivation stage of the copper fish fry, sewage is discharged 2 times a day, and the sewage discharge time is 10:00 and 14:00 respectively.

[0024] Compared with the prior art, the advantages and beneficial effects of the present application are that:

[0025] The present application improves the feeding method of the opening bait Daphnia according to the opening demand of the copper fish, and the specific operation is as follows: a filter bag with a suitable aperture size is customized, the eggshells and unhatched eggs in the Daphnia hatching barrel are removed first, then filtration is performed, the hatched Daphnia is collected, and the required Daphnia is filtered out by the customized filter bag for feeding. After multiple comparisons, it is found that after filtration, the opening rate of the copper fish is greatly improved to more than 85%, which breaks through the technical bottleneck of the opening stage cultivation technology of the copper fish. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic view of the filter device.

[0027] Among them, 1-supporting leg, 2-supporting table, 3-working hole, 4-first bag mouth supporting ring, 5-first mesh, 6-first handle.

[0028] Since the second filter bag and the first filter bag have the same structure but different sizes, only the first filter bag is marked. DETAILED DESCRIPTION

[0029] The application will be described in detail below with specific examples.

[0030] The following examples all need to use the self-made filter device, the schematic diagram of the filter device is shown in the figure Figure 1 As shown in the figure, the filter device includes a support, a first filter mesh bag and a second filter mesh bag. The support includes four legs 1 and a support table 2, and the support table 2 is square. The four legs 1 are distributed in a square shape, and each of the four legs 1 is inclinedly arranged, and the upper end of each of the four legs 1 is fixedly connected with a corner of the support table 2.

[0031] The first filter mesh bag is in the shape of a circular truncated cone, and includes a first bag opening support ring 4 and a first mesh cloth 5. The first mesh cloth 5 is fixed on the first bag opening support ring 4, and the space in the ring of the first bag opening support ring 4 constitutes the bag opening of the first filter mesh bag. A first handle 6 in the shape of a rod is connected to the first bag opening support ring 4, and the first handle 6 and the first bag opening support ring 4 are located on the same plane.

[0032] The second filter mesh bag is in the shape of a circular truncated cone, and includes a second bag opening support ring and a first mesh cloth. The second mesh cloth is fixed on the second bag opening support ring, and the space in the ring of the second bag opening support ring constitutes the bag opening of the second filter mesh bag. The height of the second filter mesh bag is greater than the height of the first filter mesh bag, so as to facilitate rapid water filtration. A second handle in the shape of a rod is connected to the second bag opening support ring, and the second handle and the second bag opening support ring are located on the same plane.

[0033] The support table 2 is centrally provided with a working hole 3, and the diameter of the working hole 3 is consistent with the inner diameter of the first bag opening support ring 4 and the second bag opening support ring.

[0034] Example 1

[0035] 1. On June 15, 2021, 26,000 copper fish flat-swimming fry were put into 12 culture barrels in the middle of the recirculating water room fry culture facility, each culture barrel had a diameter of 0.8 m and a water depth of 0.5 cm. The culture barrels contained aerated tap water, and the water body had a dissolved oxygen of 6.2-10.98 mg / L, a pH of 7.7-8.0, an ammonia nitrogen of 0.035-0.07 mg / L, and a nitrite nitrogen of 0.004-0.009 mg / L. The water depth in each culture barrel was controlled at 0.45 m, and the water temperature was 21.3-21.8℃. During the opening culture period of the copper fish fry, the highest light intensity during the day was 456 Lux, and the lowest light intensity at night was 0 Lux.

[0036] 2. On the day when the copper fish flat-swimming fry were put into the culture barrels, the eggshells and unhatched eggs of the brine shrimp hatcher were removed, and the brine shrimp was released from the hatcher.

[0037] 3. First, place the second bag bottom support ring of the second filter net bag on the working hole of the support table, then place the first filter net bag net inside the second filter net bag. The mesh of the first net is a square hole, and the side length of the first net mesh is 0.35 mm. The mesh of the second net is a rhombus hole, and the diameter of the first net mesh is 0.11 mm. Then, put the brine shrimp released from the incubator into the first filter net bag net and wash it with water.

[0038] 4. Use the brine shrimp collected in step S3 to feed the copper fish fry. Feed 4 times a day at 8:00, 12:00, 16:00, and 20:00. After each feeding, the density of brine shrimp in the water body is about 10 / mL. Discharge waste water 2 times a day at 10:00 and 14:00.

[0039] 5. After the fry opens its mouth, continue to feed brine shrimp for 15 days, and then switch to artificial feed. Artificial feed is fed at 8:00 and 18:00 every day, with a daily feeding amount of 5% of the body weight of all fry.

[0040] On June 18, 2021, randomly take copper fish fry from each breeding barrel, and count the opening rate under the body display mirror. The results show that the average opening rate is 88.14%.

[0041] Example 2

[0042] 1. On June 10, 2022, 63,000 copper fish swimming fry were placed in 8 breeding barrels in the middle of the recirculating water room fry rearing facility, each breeding barrel was 1.5 m in diameter and 0.6 m in water depth. The breeding water in the breeding barrel was aerated tap water, the dissolved oxygen in the water body was 6.3-9.98 mg / L, the pH was 7.6-7.9, the ammonia nitrogen was 0.035-0.075 mg / L, and the nitrite nitrogen was 0.003-0.01 mg / L. The water depth in each breeding barrel was controlled at 0.5 m, and the water temperature was 21.2-21.9°C. During the opening cultivation of copper fish fry, the highest light intensity during the day was 452 Lux, and the lowest at night was 0 Lux.

[0043] 2. On the day the copper fish swimming fry was placed in the breeding barrel, the eggshell and unhatched eggs of the brine shrimp incubator were removed, and the brine shrimp was released from the incubator.

[0044] 3、First, the second bag bottom support ring of the second filter net bag is placed on the working hole of the support table, and then the first filter net bag is placed in the second filter net bag. The mesh of the first net bag is a square hole, and the diameter of the first net bag mesh is 0.50mm. The mesh of the second net bag is a rhombus hole, and the diameter of the first net bag mesh is 0.11mm. Then, the brine shrimp released from the incubator is put into the first filter net bag mesh and washed with water. After filtering, the first filter net bag is removed, and the brine shrimp in the second filter net bag is collected and put into a plastic basin, and 1 / 3 volume of culture water is added to the plastic basin.

[0045] 4、The brine shrimp collected in step S3 is used to feed the copper fish fry, and the feeding is performed 4 times a day at 8:00, 12:00, 16:00 and 20:00. After each feeding, the density of brine shrimp in the water body is about 10 / mL. The sewage is discharged twice a day at 10:00 and 14:00.

[0046] 5、After the fry opens, continue to feed brine shrimp for 15 days, and then switch to artificial feed. The artificial feed is fed at 8:00 and 18:00 every day, and the daily feeding amount is 5% of the body weight of all fry.

[0047] On June 13, 2022, the copper fish fry in each culture barrel was randomly taken, and the opening rate was counted under the body display mirror. The results showed that the average opening rate was 92.65%.

Claims

1. A method for raising copper fish fry during the initial feeding stage, characterized in that... Includes the following steps: S1. After all the copper fish fry in the hatching facility have swum horizontally, transfer them to the breeding tanks in the indoor seedling cultivation facility for further cultivation, with a stocking density of 8,000-10,000 fish / m³. S2. On the day the copper fish fry are put into the breeding tank, remove the eggshells and unhatched eggs from the brine shrimp incubator, and then release the brine shrimp. S3. Use a filter device to filter brine shrimp. The filter device includes a first filter bag and a second filter bag. The outer diameter of the mesh of the first filter bag is 0.5-0.8 mm, and the outer diameter of the mesh of the second filter bag is 0.13-0.20 mm. During filtration, first place the first filter bag mesh inside the second filter bag, then put the brine shrimp released from the incubator into the first filter bag mesh, rinse with water and filter. After filtration, remove the first filter bag and collect the brine shrimp in the second filter bag. S4. Feed the copper fish fry with the brine collected in step S3, 3-4 times a day, each time feeding 5-10 brine per mL of water. Continue feeding brine for 15-20 days after the copper fish fry start to eat. S5. Then feed artificial compound feed 2-3 times a day, with a daily feed amount of 4%-6% of the body weight of the copper fish fry.

2. The method for cultivating copper fish fry during the initial feeding stage according to claim 1, characterized in that: The aquaculture tank has a diameter of 0.5-2m and a water depth of 0.4-0.6m.

3. The method for cultivating copper fish fry during the initial feeding stage according to claim 1, characterized in that: The aquaculture water is aerated tap water, well water, or spring water that meets the requirements of the "Fishery Water Quality Standard" GB11607-89, with dissolved oxygen of 6.2-10.98 mg / L, pH of 7.6-8.0, ammonia nitrogen of 0.035-0.075 mg / L, and nitrite nitrogen of 0.003-0.01 mg / L.

4. The method for cultivating copper fish fry during the initial feeding stage according to claim 1, characterized in that: During the initial rearing stage of the copper fish fry, the water temperature is 22-24℃ and the light intensity is 0-456 Lux.

5. The method for cultivating copper fish fry during the initial feeding stage according to claim 1, characterized in that: In step S3, after filtration, brine shrimp that cannot pass through the mesh of the first filter screen are used as food for other fish.

6. The method for cultivating copper fish fry during the initial feeding stage according to claim 1, characterized in that: In step S4, the animals are fed four times a day at 8:00, 12:00, 16:00 and 20:

00.

7. The method for cultivating copper fish fry during the initial feeding stage according to claim 1, characterized in that: In step S5, the animals are fed twice a day, at 8:00 and 18:00 respectively.

8. The method for cultivating copper fish fry during the initial feeding stage according to claim 1, characterized in that: During the initial rearing stage of the copper fish fry, sewage is discharged twice a day, at 10:00 and 14:00 respectively.

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