A mobile fry cultivation method

Abstract

The present invention discloses a movable fish fry cultivation method, including: the production and placement of a cultivation device: a fish fry cultivation box is made of PVC scraper cloth, supported by several brackets, and a sewage outlet is provided at the bottom; a floating frame made of PVC pipe is placed inside the cultivation box; a fish fry cultivation net is installed on the floating frame; the cultivation device can be placed indoors or outdoors; the cultivation water treatment and circulation: the cultivation water is fully aerated, sterilized by biochemical cotton filter, ozone and ultraviolet light, and circulated to the fish fry cultivation box; fish fry cultivation: the fish fry are separated and raised in the cultivation net, and are fed with brine shrimp and compound feed, and the sewage is sucked and the water is changed to ensure the survival rate of the fish fry. The cultivation device of the present invention is detachable, easy to fold, light and easy to carry, and has strong practicality. The cultivation technology is simple and easy to master, which ensures the cultivation water and nutrition requirements, effectively improves the survival rate of the fish fry, and can be widely used in breeding farms or proliferation and release stations with insufficient fish fry cultivation facilities, and can also be used in field ships or banks without fish fry cultivation facilities.

Description

Technical Field

[0001] The invention belongs to the technical field of fish fry breeding, and in particular relates to a movable fish fry breeding method. Background Art

[0002] Fry are young fish hatched from fertilized eggs. They are weak and have very strict requirements on the cultivation conditions. The survival rate and health of fry are crucial to the growth, development and survival of later fish species. However, in the actual cultivation process, it is often encountered that there are insufficient fry cultivation facilities or limited conditions on the cultivation site. However, the purchase and installation of a set of fry cultivation facilities has high consumables and labor costs, is time-consuming, occupies a large space, is difficult to disassemble after use, and has low mobility and reusability. Summary of the invention

[0003] In order to solve the shortcomings of the prior art, the purpose of the present invention is to provide a movable fry cultivation method, the cultivation box has low manufacturing and use costs, is thickened and wear-resistant, detachable, easy to fold, light and easy to carry, and has strong practicality. It can be used in breeding farms or proliferation and release stations with insufficient fry cultivation facilities, as well as field vessels or banks without fry cultivation facilities. The fry cultivation technology is simple to operate and easy to master. Based on the fry cultivation method of the present invention, the cultivation water environment and nutritional requirements required for the growth and development of fry are guaranteed, and the survival rate of fry can be effectively improved.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme: a movable fry cultivation method, the steps of which are:

[0005] 1. Production and placement of the cultivation device: 1) The fry cultivation box is made of PVC scraper cloth, and the fry cultivation box is supported by multiple brackets. A sewage outlet is provided at the bottom of the fry cultivation box; 2) A floating frame made of PVC pipe is placed inside the fry cultivation box, and the long side and wide side of the floating frame are connected by two-way pipes. The wide side of the floating frame is connected to at least two PVC pipes at intervals through a three-way pipe, and fixing nails are provided on multiple long sides of the floating frame; 3) The fry cultivation net is made of nylon mesh and installed on the floating frame; 4) According to the conditions of the cultivation site, the cultivation device can be placed indoors or outdoors;

[0006] 2. Treatment and circulation of water for cultivation: The water for fry cultivation needs to be fully aerated, biochemical cotton filter, ozone and ultraviolet light sterilization, and then circulated to the fry cultivation box;

[0007] 3. Fry cultivation: Fry are cultured at a density of 4×10 4 Tail / m 3 The fry are raised separately in a fish fry cultivation net, fed with brine shrimp and compound feed, the sewage is sucked out and the water is replaced every day, and the water temperature and dissolved oxygen are measured to ensure the nutritional needs and environment of the fry growth.

[0008] Preferably, the material for making the fry culture box is a three-layer sandwich PVC scraper cloth, which is not easy to deform, thick and wear-resistant, prolongs the service life of the box, is waterproof and impermeable, non-toxic and tasteless, and is suitable for fry culture. Inflatable stones and biochemical cotton filters are placed at the bottom of the fry culture box to filter dirt, efficiently cultivate nitrifying bacteria, and increase the oxygen content of the culture water to ensure good water quality for the culture water.

[0009] Preferably, the fry breeding net is made of a 60-mesh nylon net with a pore size of 0.25 mm. The newly hatched brine shrimp fry are small in size, with a body length of 0.43-0.52 mm. The selected fry breeding net can prevent the fry from escaping and the brine shrimp that the fry eats, thereby avoiding bait waste and water pollution.

[0010] Preferably, a shower pipe is installed above the fry breeding net to increase the dissolved oxygen in the breeding water and improve the survival rate of the fry; a lead sinker is placed at the bottom of the fry breeding net to prevent the breeding net from swinging and floating during the breeding period, thereby preventing the fry from escaping.

[0011] Preferably, the cultivation device is detachable, easy to fold, light and easy to carry, and highly mobile. It can be placed in a breeding farm or a proliferation and release station with insufficient fry cultivation facilities, or on a field vessel or shore slope without fry cultivation facilities.

[0012] Preferably, if the cultivation device is installed in a breeding farm or a proliferation station, the cultivation water has been sterilized and the water can be directly introduced into the fry cultivation box; if the cultivation device is installed on a wild ship or a slope, the cultivation water source is river water, which must be precipitated, fully aerated, filtered by a biochemical cotton filter, and sterilized by ozone and ultraviolet light before it can be introduced into the fry cultivation box.

[0013] Preferably, the fry are fed with brine shrimp as the starter bait, and the brine shrimp are hatched on site, with a ratio of salt to brine shrimp of 2:1, and the hatching water temperature is 28°C and the salinity is 3%. The newly hatched shrimp fry carry yolk sacs, which are rich in unsaturated fatty acids DHA and are extremely nutritious, which can improve the resistance and survival rate of the fry.

[0014] Preferably, the feeding strategy is: feeding brine shrimp at the beginning, and after one week, supplementary feeding of special compound feed for fry (crude protein 51%, crude fat 10%, particle size 200-400um), gradually increasing the feeding amount of compound feed during the period, and feeding feed of different particle sizes as the fry grow. In the first two weeks of fry cultivation, feed 5 times a day (7:00, 11:00, 15:00, 19:00, 23:00), and then feed 3-4 times (7:00, 12:00, 18:00, 22:00) according to the appetite of the fry and water quality.

[0015] Preferably, during the cultivation period, siphon the dirt every day, change 1 / 3 of the water, measure the water temperature and dissolved oxygen, and detect ammonia nitrogen and nitrite nitrogen every week to ensure that the total ammonia nitrogen ≤ 0.2 mg / L and the nitrite nitrogen ≤ 0.01 mg / L.

[0016] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0017] 1. The fry cultivation box body of the present invention is low in production and use costs, thickened and wear-resistant, has a high space utilization rate, is detachable, easy to fold, durable, light and easy to carry, and has strong mobility and practicability. It solves the problem that fish farms or fry release stations breed a large number of fry, but the fry cultivation facilities are insufficient, or during the fry cultivation process, diseases break out and it is necessary to transfer the pond, but the fry cultivation facilities are insufficient. At this time, purchasing and installing a set of fry cultivation ponds or fry cultivation tanks is both time-consuming and greatly increases the cost. The present invention can just solve the above problems. The cultivation device of the present invention is economical and efficient, and uses the limited space of fish farms or fry release stations to be manufactured and put into use within 1-2 days; in addition, the field cage boats do not have fry cultivation facilities. The newly hatched fry have weak constitutions. When transported to places with fry cultivation facilities, not only does the fry mortality rate increase during transportation, but also the fry constitution is reduced, greatly increasing the fry mortality rate during the later cultivation process. The fry cultivation device made by the present invention can use the limited space and be placed on field cage boats or the shore slope, reducing the transportation cost and ensuring the fry survival rate.

[0018] 2. The fry cultivation net of the present invention uses a 60-mesh nylon net with a pore diameter of 0.25 mm. The newly hatched brine shrimp fry are small in size, with a body length of 0.43-0.52 mm. The selected fry cultivation net can not only prevent the fry from escaping, but also prevent the escape of the fry's first food, brine shrimp, avoiding feed waste and water pollution.

[0019] 3. The fry cultivation water of the present invention is fully aerated, oxygenated by a biochemical cotton filter and a rain pipe, ensuring the oxygen content of the fry cultivation water; in addition, the fry cultivation water passes through a biochemical cotton filter, ozone and an ultraviolet lamp for sterilization, filtering dirt such as feed debris and fish feces, and harmful substances can be further decomposed by nitrifying bacteria growing on the biochemical filter cotton, ensuring the cultivation water environment required for the growth and development of fry.

[0020] 4. The fry cultivation first food of the present invention feeds brine shrimp, and the brine shrimp is hatched on-site. The newly hatched shrimp fry carry yolk sacs, are rich in unsaturated fatty acid DHA, and are extremely nutritious, which can greatly improve the resistance and survival rate of fry.

[0021] 5. The feeding strategy of the fry feed of the present invention is to feed the brine shrimp hatched on site to improve the resistance of the fry; after one week, the feed with 51% crude protein and 10% crude fat is supplemented to feed high protein to meet the nutritional needs of the fry in the rapid growth stage; in the early stage, the fry is fed with feed with a particle size of 200-400um, and as the fry grows and develops, feed with different particle sizes of 400-600um, 600-900um, 1.0mm and 1.2mm is fed, and the particle size of the fed feed is suitable for the caliber of the fry in the growth stage, so as to improve the appetite of the fry and the survival rate of the fry.

[0022] Based on the above advantages, the movable fry cultivation method provided by the present invention has a low production and use cost of the cultivation box, is thickened and wear-resistant, detachable, light and easy to carry, and has strong mobility and practicality. It can be used in breeding farms or proliferation and release stations with insufficient fry cultivation facilities, as well as field vessels or banks without fry cultivation facilities. The fry cultivation technology is simple to operate and easy to master. The provided fry cultivation method ensures the cultivation water environment and nutritional requirements required for the growth and development of fry, enhances the resistance of fry, effectively improves the survival rate of fry (more than 95%), and provides a guarantee for the growth, development and survival of later fish species. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a fry cultivation device;

[0024] Figure 2 Schematic diagram of the fish fry being cultivated;

[0025] In the figure: 1-fish fry cultivation box; 2-bracket; 3-drain outlet; 4-floating frame; 5-tee pipe; 6-fixing nail; 7-fish fry cultivation net; 8-rain pipe; 9-two-way pipe; 10-lead sinker. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is described in detail below with reference to the embodiments and drawings. Unless otherwise specified, the technical solutions described in the embodiments of the present invention can be used as reference in the art.

[0027] A movable fry cultivation method, the steps of which are:

[0028] 1. Production and placement of cultivation equipment, such as Figure 1 As shown:

[0029] 1) The fry cultivation box 1 is made of three-layered double-wire PVC knife-coated fabric (manufacturer: Tiansheng Tarpaulin), which is not easily deformed, thickened, wear-resistant, and can extend the service life of the box. Ten supports 2 are used to support the fry cultivation box 1 to ensure its stability. A sewage outlet 3 is provided at the lower part of the fry cultivation box 1, and a biochemical cotton filter (Xinyou XY-380, filter height 14 cm, diameter 12 cm) and an air stone are placed at the bottom to filter dirt, efficiently cultivate nitrifying bacteria, increase the oxygen content of the cultivation water, and ensure the stable and good quality of the cultivation water.

[0030] 2) One rectangular floating frame 4 (the length and width of the floating frame can be selected as 2.2×1.2 m) is placed inside the fry cultivation box 1. The floating frame 4 is made of PVC pipes. The long side and the wide side of the floating frame 4 are connected by two-way pipes 9. Two PVC pipes are connected at intervals on the wide side of the floating frame 4 by three-way pipes 5. Four fixing nails 6 are provided on each of the four long sides of the floating frame 4, which is convenient for the installation and fixation of the fry cultivation net 7.

[0031] 3) Four fry cultivation nets 7 are made of 60-mesh nylon mesh cloth (the length, width, and height of the fry cultivation net can be selected as 0.8×0.5×0.5 m, and the pore diameter is 0.25 mm). Connecting lines with a length of 20 cm are installed at the four corners of the fry cultivation net 7. The fry cultivation net 7 is installed on the floating frame 4 through the connecting lines and the fixing nails 6. A rain shower pipe 8 is installed above the fry cultivation net 7 to increase the dissolved oxygen of the cultivation water and improve the survival rate of fry. A lead weight 10 is placed at the bottom of the fry cultivation net 7 to prevent the cultivation net from swinging and floating during cultivation, and fry from escaping.

[0032] 4) The cultivation device is placed on a wild round-mouth bronze gudgeon breeding boat that does not have fry cultivation facilities.

[0033] 2. Treatment and circulation of cultivation water: Two circular pools (diameter 3.66 m, height 0.91 m) are used to treat river water, serving as a sedimentation and storage pool and a circulation pool respectively.

[0034] 1) The river water is pumped into the sedimentation and storage pool, and the sundries in the pool are removed in time with a fishing net. The pumped river water is relatively turbid, which will reduce the ozone sterilization effect. Therefore, the river water is first pretreated by sedimentation and then subjected to ozone disinfection, and the disinfection effect is more economical and effective.

[0035] 2) The river water after ozone disinfection is pumped into the circulation pool. The water in the circulation pool is introduced into the fry cultivation box 1 after sufficient aeration, passing through a biochemical cotton filter and ultraviolet lamp sterilization. In the fry cultivation box 1, with the help of the air stone, the rain shower pipe, and the biochemical cotton filter, the water is aerated and oxygenated and filtered and sterilized again. The cultivation water has undergone secondary filtration and sterilization, with fewer pathogenic bacteria and parasites, ensuring the quality of the cultivation water.

[0036] 3) Detect the main water quality indicators of the cultivation water, namely water temperature and dissolved oxygen, and ensure that the water temperature is controlled between 20.5 and 25.3 °C, and the dissolved oxygen is greater than 7.5 mg / L, which is suitable for the growth and development of Coreius guichenoti fry.

[0037] 3. Fry cultivation, as Figure 2 shown:

[0038] 1) The newly hatched fry are stocked at 4×10 4 tails / m 3 in 4 fry cultivation nets 7. Lead weights 10 are placed at the bottom of the fry cultivation net 7 to prevent the fry cultivation net 7 made of nylon mesh from swinging and floating, and the fry from escaping. During the cultivation period, the cultivation water is aerated and oxygenated again and filtered and sterilized by using air stones, rain pipes, and biochemical cotton filters, ensuring that the dissolved oxygen in the water body is above 7.5 mg / L, and the harmful substances are further decomposed by nitrifying bacteria attached to the biochemical filter cotton of the biochemical cotton filter, ensuring good and stable water quality and improving the survival rate of fry.

[0039] 2) Artemia nauplii, the live food for the newly hatched fry, is hatched on-site. The ratio of salt to Artemia nauplii is 2:1, the hatching water temperature is 28 °C, and the salinity is 3%. After hatching, it is washed twice with the fry cultivation water and then fed. The newly hatched shrimp larvae carry yolk sacs, which are rich in unsaturated fatty acid DHA and extremely nutritious, improving the resistance and survival rate of fry.

[0040] 3) Artemia nauplii are fed at the beginning. One week later, the fry are supplemented with the special compound feed for fry, Miaoduoduo A1 (Qihao Feed, crude protein 51%, crude fat 10%, particle size 200 - 400 um). During this period, the feeding amount of the compound feed is gradually increased to meet the high-protein nutritional requirements for the rapid growth of fry. At the same time, as the fry grow gradually, feeds with different particle sizes are fed to suit the mouth diameter of the fry at different growth stages, which can also improve the appetite of fry, further enhancing the immunity and survival rate of fry. Specifically, when the total length is 1.5 - 2.2 cm, switch to feeding Miaoduoduo A2 feed (crude protein 51%, crude fat 10%, particle size 400 - 600 um); when the total length is 2.2 - 3.0 cm, feed Miaoduoduo A3 feed (crude protein 51%, crude fat 10%, particle size 600 - 900 um); when the total length is 3 - 4 cm, feed Miaoduoduo A4 feed (crude protein 51%, crude fat 10%, particle size 1.0 mm); when the total length is 4 - 5 cm, feed Miaoduoduo A5 feed (crude protein 51%, crude fat 10%, particle size 1.2 mm). In the first two weeks of fry cultivation, feed 5 times a day (7:00, 11:00, 15:00, 19:00, 23:00). After that, according to the appetite of the fry and water quality, feed 3 - 4 times a day (7:00, 12:00, 18:00, 22:00), and feed in small amounts but multiple times each time. Half an hour after each feeding, the residual baits are removed in time.

[0041] 4) Siphon off dirt daily and change 1 / 3 of the water. Measure the water temperature and dissolved oxygen to ensure that the water temperature is 20.5 - 25.3 °C and the dissolved oxygen is greater than 7.5 mg / L; detect ammonia nitrogen and nitrite nitrogen weekly to ensure that the total ammonia nitrogen is less than 0.2 mg / L and the nitrite nitrogen is less than 0.01 mg / L.

[0042] For the above-mentioned device, the production and use costs of the cultivation box are low, it is thickened and wear-resistant, has a high space utilization rate, is detachable, light and easy to carry, has strong practicability, and is placed on the wild Coreius guichenoti breeding boats without fry cultivation facilities. Through the above technical measures, the cultivation water environment and nutritional requirements required for the growth and development of fry are ensured. The fry have strong immunity, are active, the full-length daily growth is 0.87 mm, and the survival rate is as high as over 95%.

[0043] The above are only the preferred embodiments of the present application and are not used to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A mobile fry cultivation method, characterized in that, The following steps are involved: 1) Production and placement of a cultivation device: a fry cultivation box (1) is made of PVC scraper cloth, the fry cultivation box (1) is supported by a plurality of brackets (2), and a sewage outlet (3) is provided at the bottom of the fry cultivation box (1); a floating frame (4) made of PVC pipes is placed in the fry cultivation box (1), the long side and the wide side of the floating frame (4) are connected by two-way pipes (9), the wide side of the floating frame (4) is connected to at least two PVC pipes at intervals through a three-way pipe (5), and fixing nails (6) are provided on a plurality of long sides of the floating frame (4); a plurality of fry cultivation nets (7) made of nylon mesh cloth are installed on the floating frame (4); the cultivation device is placed in a breeding farm or a proliferation and release station with insufficient fry cultivation facilities, or placed on a field vessel or a bank slope without fry cultivation facilities; 2) Treatment and circulation of culture water: The water used for fish fry culture must be fully aerated, sterilized by biochemical cotton filter, ozone and ultraviolet light, and then circulated into the fish fry culture box (1); 3) Fry cultivation: The fry are stocked at a density of 4×10 4 tails / m 3 and separately cultured in the fry cultivation net (7), fed with artemia and compound feed, the sewage is sucked and the water is changed every day, the water temperature and dissolved oxygen are measured to ensure the nutritional needs and suitable environment for the growth of the fry.

2. The movable fry cultivation method according to claim 1, characterized in that, The material used to make the fry culture box (1) is a three-layer sandwich PVC scraper cloth, and an inflatable stone and a biochemical cotton filter are placed at the bottom of the fry culture box (1).

3. The movable fry cultivation method according to claim 1, characterized in that, The fry culture net (7) uses a 60-mesh nylon net with a pore size of 0.25 mm.

4. The movable fry cultivation method according to claim 1, characterized in that, A shower pipe (8) is installed above the fry cultivation net (7), and a lead sinker (10) is placed at the bottom.

5. The movable fry cultivation method according to claim 1, characterized in that, If the culture device is placed in a breeding plant or a proliferation station, the culture water has been sterilized and can be directly introduced into the fry culture box (1); If the cultivation device is placed on a boat or a bank slope in the wild, the cultivation water source is river water, which must be precipitated, fully aerated, filtered by a biochemical cotton filter, and sterilized by ozone and ultraviolet light before it can be introduced into the fry cultivation box (1).

6. The movable fry cultivation method according to claim 1, wherein The fry are fed with brine shrimp as the starter bait, and the brine shrimp are hatched on site, the ratio of salt to brine shrimp is 2:1, the hatching water temperature is 28°C, and the salinity is 3%.

7. The movable fry cultivation method according to claim 6, wherein Feed with brine shrimp at the beginning of the day, and after one week, supplement with special compound feed for fry, which contains 51% crude protein, 10% crude fat, and a particle size of 200-400um. During this period, gradually increase the amount of compound feed, and feed with different particle sizes as the fry grow. In the first two weeks of fry cultivation, feed 5 times a day, at 7:00, 11:00, 15:00, 19:00, and 23:00, and then feed 3-4 times according to the appetite of the fry and water quality, at 7:00, 12:00, 18:00, and 22:

00.

8. The movable fry cultivation method according to claim 1, characterized in that, It also includes daily management, i.e. siphoning off waste every day, changing 1 / 3 of the water, measuring water temperature and dissolved oxygen, and testing ammonia nitrogen and nitrite nitrogen every week to ensure that total ammonia nitrogen is ≤0.2mg / L and nitrite nitrogen is ≤0.01mg / L.

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