Culture mode for circularly starving grass carps and then feeding and intercropping freshwater shrimps based on pond culture

Abstract

The invention belongs to the technical field of fish culture, and particularly discloses a pond culture-based culture mode for circularly starving grass carps, then feeding and intercropping freshwater shrimps, which is characterized in that the grass carps are cultured in a feeding mode of circularly starving and then feeding, and a gentle slope and a freshwater shrimp culture net cage are arranged on the bank of a grass carp pond for intercropping the freshwater shrimps. The freshwater shrimps are intercropped in the grass carp pond in a circulating starvation feeding mode, the utilization rate of grass carp feed is increased, fat accumulation in grass carp bodies is reduced, the disease resistance and stress resistance of the grass carp are enhanced, the survival rate of the grass carp is increased, and the meat quality of the grass carp is optimized; the freshwater shrimp culture net cage makes full use of the gentle slope space of the pond, and the economic benefits of the pond are increased through freshwater shrimp intercropping.

Description

Technical Field

[0001] The invention belongs to the technical field of fish breeding, and in particular relates to a breeding mode of grass carp culturing in a pond with cycle starvation and refeeding and shrimp breeding. Background Art

[0002] Grass carp (Ctenopharyngodon idella), also known as oil carp, grass carp, white carp, etc., belongs to the genus Ctenopharyngodon, family Cyprinidae, order Cypriniformes. Grass carp is a freshwater herbivorous economic farmed fish with an optimal growth temperature of 18-28℃. It has delicious meat, strong disease resistance, easy to catch, and wide temperature adaptability.

[0003] Macrobrachium nipponense, also known as river shrimp, is a high-quality freshwater shrimp. It has tender meat, delicious taste and rich nutrition. According to analysis, every 100 grams of shrimp meat contains 16.4 grams of protein, 1.3 grams of fat, as well as carbohydrates, vitamins, calcium, phosphorus, iron and other nutrients. It is a well-known high-protein and low-fat aquatic food, which is quite popular among consumers. It has strong adaptability, wide distribution, miscellaneous diet, fast growth and strong reproductive capacity. It is currently an ideal shrimp species for pond and cage farming.

[0004] The main defects of grass carp single pond farming are as follows: first, the large amount of excrement produced by high-density farming of grass carp is easy to cause diseases, affecting the production of grass carp; second, the feed utilization rate is low, which increases the farming cost. In this regard, the inventors considered that the abundant aquatic plants and sufficient dissolved oxygen in the grass carp farming pond are also very suitable for farming green shrimps, and proposed a model of grass carp and green shrimp to solve these problems: on the one hand, the excrement produced by the grass carp during its growth can be used as a biological fertilizer in the green shrimp pond, for the water plants to re-enter the pond ecological chain cycle, which can avoid the high concentration of ammonia nitrogen and nitrite produced by high-density farming of grass carp causing diseases, and can also reduce the discharge of aquaculture tail water; on the other hand, the gentle slope space is fully utilized to provide conditions for green shrimp farming; the farming model of cyclic starvation and refeeding improves feed utilization and increases economic benefits. Summary of the invention

[0005] The purpose of the present invention is to provide a farming model of grass carp cyclic starvation and refeeding and shrimp-raising based on pond farming, which improves the feed utilization rate of the pond by raising shrimp in the cyclic starvation and refeeding grass carp pond, and fully utilizes the gentle slope space and high-quality water environment in the grass carp farming pond without affecting the yield and specifications of the grass carp to harvest large-sized and high-quality shrimps, thereby ensuring the yield and benefit of the grass carp and greatly improving the feed utilization rate of the pond, the total output value of the pond and the total economic benefit through the increased production of shrimps.

[0006] In order to achieve the above object, the specific technical solution adopted by the present invention is as follows:

[0007] A farming model for grass carp with cyclic starvation and refeeding in ponds and shrimp farming, wherein grass carp is farmed in a cyclic starvation and refeeding manner, and a gentle slope and shrimp farming cages are set on the bank of a grass carp pond to farm shrimp; the shrimp farming cages are set on the gentle slope of the pond for shrimp farming and escape prevention.

[0008] The feeding method of the cycle of starvation and refeeding is to stop eating for one day before formal feeding, start formal feeding on the second day, and feed continuously for six days; then starve for one day, and then feed continuously for six days; and repeat the cycle.

[0009] The green shrimp breeding cage comprises a fishing net cage, a fixed steel pipe and an escape-proof opening; the fixed steel pipe fixes the cage on a gentle slope; and the escape-proof opening is located on the bank of a pond.

[0010] In a preferred embodiment of the present invention, the farming model of cyclic starvation and refeeding of grass carp and shrimp in pond culture comprises the following steps:

[0011] (1) Renovation of aquaculture ponds: including setting up gentle slopes and shrimp aquaculture cages beside grass carp ponds;

[0012] (2) Preparation before aquaculture: including pond cleaning, disinfection, pond drying, fertilization and planting of aquatic plants;

[0013] (3) Grass carp stocking: including grass carp selection and grass carp stocking;

[0014] (4) Freshwater shrimp stocking: including the selection and release of freshwater shrimp fry;

[0015] (5) Feeding: including feed selection, controlling feeding time and feeding amount;

[0016] (6) Aquatic plant management: including aquatic plant species, aquatic plant cultivation, cutting and combing;

[0017] (7) Water quality management: including water quality, water level, water temperature and water color;

[0018] (8) Grass carp fishing: including fishing time and fishing methods;

[0019] (9) Shrimp fishing: including fishing time and fishing methods.

[0020] In a preferred embodiment of the present invention, in step (1), the grass carp pond is long from east to west and narrow from north to south, and is rectangular with four arc-shaped corners; the width of the pond bank is 2-3m, the slope ratio is 1:2-3, the pond depth is 1.5-1.8m, and the area is 10-20 mu; a water inlet gate and a water outlet gate are respectively arranged at both ends of the grass carp pond, and a mesh with a mesh size of 0.6-0.8cm is arranged around the water inlet; the shrimp breeding cage is fixed to the bottom of the gentle slope with a fixed steel pipe, the fixed steel pipe is exposed 30cm above the water surface, and the escape prevention port is located at the edge of the pond for subsequent shrimp seedling placement and feeding.

[0021] In a preferred embodiment of the present invention, in step (3), the grass carp is summer grass carp, the stocking density is 40,000-60,000 per mu, and the stocking time is early June.

[0022] In a preferred embodiment of the present invention, in step (4), the shrimp fry are 2000-3000 per box, with a specification of 1000-2000 per kg; the fry are released from early January to early March in spring farming, and from late June to early August in autumn farming.

[0023] In a preferred embodiment of the present invention, in step (5), the grass carp is fed twice a day during the breeding process, the feeding time is 8:30-9:30 in the morning and 5:00-6:00 in the afternoon; the feeding method is a cycle feeding of 6 consecutive days after starvation for 1 day; the feeding amount is 5-10% of the body weight of the grass carp. During the breeding process of fresh shrimp, the grass carp is fed once a day, the feeding time is 4:00-5:00 in the afternoon; the feeding amount is 6-10% of the body weight of the fresh shrimp.

[0024] In a preferred embodiment of the present invention, in step (7), the water depth in the grass carp pond is controlled at 0.5-0.6 m in spring and maintained at 1.2-1.5 m in summer, the dissolved oxygen in the water is not less than 5 mg / L, and the pH value of the water is maintained at 7-9.

[0025] In a preferred embodiment of the present invention, in step (8), the grass carp is caught from late November to December using a dragnet fishing method.

[0026] In a preferred embodiment of the present invention, in step (9), the shrimps are caught between June and July and December to January of the following year, and the shrimp farming cages are taken out by removing the fixed steel pipes.

[0027] The present invention has the following beneficial effects:

[0028] 1. Significant economic benefits

[0029] Improved feed utilization rate: Feeding grass carp through a cyclic starvation-refeeding farming model can fully stimulate grass carp's feed utilization rate. Under the influence of one day of hunger, grass carp undergoes compensatory growth, and the feed utilization rate is further improved in the subsequent satiation feeding. When satiation feeding, the residual bait provides compensatory feed for the shrimp, reducing the input of shrimp feed.

[0030] Improved growth rate: The growth rate of grass carp fed through the cyclic starvation and refeeding breeding model is higher than that of grass carp fed normally; the meat quality of grass carp fed through cyclic starvation and refeeding is better than that of grass carp fed normally, with less fat accumulation in the body, stronger disease resistance, higher stress resistance, and stronger resistance to adverse factors than grass carp fed normally; the survival rate of grass carp fed through cyclic starvation and refeeding is higher.

[0031] Improved space utilization: Grass carp normally move in the middle and lower layers and gather in groups when feeding; freshwater shrimp are cultured on gentle slopes through freshwater shrimp culture cages; there is no competition between grass carp and freshwater shrimp in space, so the pond space can be fully utilized to enhance economic benefits.

[0032] High breeding success rate: Conventional pond shrimp farming is prone to diseases and has a low breeding success rate. Disease is an important factor hindering the development of shrimp farming. Grass carp and shrimp do not infect each other with diseases. The number of shrimp raised in grass carp ponds is less than 1 / 5 of that in intensive ponds. The good ecological environment of grass carp ponds can reduce the occurrence of shrimp diseases and greatly improve the success rate of shrimp farming.

[0033] Considerable sales profit: In the farming model of grass carp being starved and then fed with fresh shrimp, the average amount of fresh shrimp released per mu can reach 20,000. The farming cost is calculated at 20 yuan / jin based on feeding high-protein compound feed throughout the whole process. The selling price of adult fresh shrimp is 30-45 yuan / jin. The yield of fresh shrimp per mu is 500 jin, and the profit is more than 10 yuan / jin. Without affecting the profit of grass carp, the average income per mu can be increased by more than 5,000 yuan, with significant economic benefits.

[0034] 2. Obvious ecological benefits

[0035] Fewer grass carp diseases: The use of drugs for disease prevention and treatment is reduced accordingly, reducing the pollution to water bodies caused by the use of drugs.

[0036] Aquaculture ecological complementarity: The nitrogen, phosphorus, potassium and other nutrients in grass carp's excrement can be absorbed by aquatic plants and algae and re-enter the pond ecological chain, reducing the application of fertilizers. At the same time, the grass carp aquaculture tail water is purified by the pond itself, reducing the discharge of aquaculture tail water.

[0037] 3. Strong replicability and promotion

[0038] The farming model of cyclically starving pond grass carp and then feeding and raising freshwater shrimp is simple to transform, has low investment cost, low technical requirements, strong operability, can be adapted to ponds of different sizes, and is easily accepted by fishermen. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The structure diagram of the shrimp culture cage of the present invention is shown in the figure, 1 is the fishing net cage, 2 is the escape prevention hole, and 3 is the fixed steel pipe. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0041] Unless otherwise indicated, all technical and scientific terms used in the present invention have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present description without departing from the scope or spirit of the present invention. Other embodiments obtained from the description of the present invention will be apparent to the technician.

[0042] The terms "include", "comprising", "having", "containing", etc. used in the present invention are all open terms, which mean including but not limited to. The "%" mentioned in the present invention, unless otherwise specified, represents mass percentage.

[0043] The invention provides a farming model of grass carp cyclic starvation and refeeding and green shrimp farming based on pond farming, which is a model of farming grass carp in a cyclic starvation and refeeding feeding mode, and simultaneously setting a gentle slope and green shrimp farming cages in a grass carp pond to farm green shrimp.

[0044] The feeding method of the cycle starvation and then feeding is to stop feeding for one day before formal feeding, and start formal feeding on the second day, and feed continuously for six days; then starve for one day, and feed continuously for six days; and so on. The starvation stress before normal feeding can, to a certain extent, promote compensatory growth of grass carp, improve feed utilization, accelerate growth (growth rate is faster than that of normal feeding of grass carp), reduce fat accumulation in grass carp, optimize meat quality, enhance disease resistance and stress resistance of grass carp, improve growth rate, reduce the time to grow to the required specifications, reduce bait input, and improve economic benefits. If feeding is normal, the remaining bait in the grass carp pond affects the water quality, the feed utilization rate is reduced, the grass carp feed intake is too high, fat accumulation is high, the incidence rate is increased, and stress resistance is reduced, which affects the meat quality; if the cycle starvation time is too long, the grass carp fails to undergo compensatory growth, the growth rate is reduced, the time to grow to the required specifications is prolonged, the input cost is increased, and the economic benefits are reduced.

[0045] The shrimp farming cage is set on a gentle slope of the pond, and includes a fishing net cage 1, a fixed steel pipe 3 and an escape-proof opening 2 (such as Figure 1 As shown), the fixed steel pipe 3 fixes the fishing net cage 1 on the gentle slope, and the escape prevention 2 is located on the bank of the pond; the shrimp farming cage is used for shrimp farming and escape prevention.

[0046] In a preferred embodiment of the present invention, the following steps are included:

[0047] (1) Renovation of aquaculture ponds: including setting up gentle slopes and shrimp aquaculture cages beside grass carp ponds;

[0048] (2) Preparation before aquaculture: including pond cleaning, disinfection, pond drying, fertilization and planting of aquatic plants;

[0049] (3) Grass carp stocking: including grass carp selection and grass carp stocking;

[0050] (4) Freshwater shrimp stocking: including the selection and release of freshwater shrimp fry;

[0051] (5) Feeding: including feed selection, feeding time and feeding amount;

[0052] (6) Aquatic plant management: including aquatic plant species, aquatic plant cultivation, cutting and combing;

[0053] (7) Water quality management: including water quality, water level, water temperature and water color;

[0054] (9) Shrimp fishing: including fishing time and fishing methods.

[0055] In a preferred embodiment of the present invention, in step (1), the grass carp pond is preferably long from east to west and narrow from north to south; it is rectangular with arc-shaped corners; the bank is 2-3m wide with a slope ratio of 1:2-3, and must be compacted to prevent water leakage and water seepage. The grass carp pond is preferably 1.5-1.8m deep and 10-20 mu in area. A high-inlet and low-drainage system is set up, with water inlet gates and drainage gates at both ends of the grass carp pond, and a mesh of 0.6-0.8cm mesh is set outside the water inlet to prevent debris from entering the grass carp pond. A 40-mesh dense water filter bag is set at the water inlet to prevent eggs and seedlings of wild fish and other enemies from entering the grass carp pond with the water flow. The shrimp breeding cage is fixed on the gentle slope of the pond with a fixed steel pipe, and the fixed steel pipe is 30cm above the water surface of the pond. When the shrimp grows to commercial specifications, the fixed steel pipe is removed and the shrimp breeding cage is taken out. An impeller aerator is set in the middle of the pond.

[0056] In step (2), the above-mentioned preparation for breeding is carried out when the pond is idle in winter. First, the pond water is drained, the pond is sun-dried, disinfected, and the pond is cleaned. Then, fertilization is carried out and the central field is rotary-tilled and exposed to the sun for about one month. After 7-10 days of pond cleaning, new water is injected into the surrounding ditch to control the water level at 30-40 cm.

[0057] In step (3), the grass carp is stocked by selecting summer flower seedlings of uniform size and strong vitality bred in the current year, and is released in early June at a stocking density of 40,000-60,000 per mu.

[0058] In step (4), the fresh shrimps are stocked with 2000-3000 fresh shrimp fry / box, with a specification of 1000-2000 fresh shrimp fry / kg. The stocking time is: in spring farming, the fry are generally released from early January to early March; in autumn farming, the fry are generally released from the end of June to early August.

[0059] In step (5), the grass carp feed is generally mainly composed of pellet feed, supplemented by grass cake feed, or only pellet feed can be fed. During the breeding process of grass carp, feed twice a day, at 8:30-9:30 in the morning and 5:00-6:00 in the afternoon. The feeding method is a cycle feeding for 6 consecutive days after starvation for 1 day; the feeding amount is 5-10% of the grass carp's body weight; insist on checking the feeding situation every day, control the total feeding amount, and do not feed too much. According to the season, weather, water quality and feeding situation, feed more on sunny days and when the feeding is strong; feed less on cloudy days and when the water temperature is low; and do not feed in rainy weather.

[0060] The shrimp feed should be high-quality, palatable and special shrimp feed. During shrimp farming, feed once a day at 4:00-5:00 p.m. and the feeding amount is 6-10% of the shrimp's body weight.

[0061] The water quality management described in step (7) refers to the different requirements of grass carp ponds for water levels in different seasons. In spring, grass carp summer flowers have not yet been released. In order to increase the water temperature and promote the growth of freshwater shrimp, the water level can be controlled at 0.5-0.6m. In summer and autumn, the water temperature is higher and the depth of the pond water should be maintained at 1.2-1.5m. The water quality should be kept fresh throughout the whole process, the aerator should be turned on frequently, the dissolved oxygen should be kept sufficient, and the dissolved oxygen in the pond water should be maintained at more than 5mg / L. The pH value of the pond water should be maintained at 7-9, and the optimum is 7.5-8.5. The water should be changed once a week in spring and once every 3 days in summer. In case of continuous high temperature, the water should be changed every day. In autumn, when the weather is hot, the water should be changed every 2 days, and the amount of water changed should account for 1 / 3 of the entire water area.

[0062] In step (8), the grass carp is caught from late November to December using a dragnet method; large grass carps are divided into ponds for subsequent cultivation.

[0063] In step (9), the prawns are caught in June-July and December-January of the following year. The fixed steel pipe is removed to take out the prawn breeding cage. According to the size of the cage and the prawns, appropriate labor is selected to pull out the prawn breeding cage.

[0064] The present invention is further described below in conjunction with specific embodiments. The raw materials used in the embodiments of the present invention, unless otherwise specified, can be obtained through commercial channels. The pellet feed used in the embodiments of the present invention was purchased from Tongwei Feed Co., Ltd. Feed parameters are: moisture ≤ 12.5%, crude protein ≥ 28.0%, crude fiber ≤ 12.0%, crude fat ≥ 5.0%, total phosphorus ≥ 0.6%, lysine ≥ 1.3%.

[0065] Example 1

[0066] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0067] (1) Breeding conditions: The grass carp breeding pond is east-west oriented, with an area of ​​15 mu. The embankment around the breeding pond is 1.8m higher than the bottom of the surrounding ditch, the top width of the embankment is 2.0m, and the slope ratio of the embankment is 1:2.5. Shrimp breeding cages are set on the gentle slope. An impeller aerator is installed in the center of the pond.

[0068] (2) Preparation before breeding: This is done when the pond is idle in winter. First, drain the pond water, dry it, disinfect it, and clean it. Then, fertilize it, till the central field and expose it to the sun for about a month, and plant Elodea and aquatic plants. 7-10 days after cleaning the pond, inject new water into the surrounding ditch and control the water level at 30-40cm.

[0069] (3) Stocking of summer grass carp: After the growth of elodea and algae stabilizes, continue to inject new water, with the water level at 50-60cm and the water temperature maintained at around 10℃. In early June, 50,000 summer grass carp that have been tamed and fed with pellet feed are stocked per mu (200 per catty), with a total of 750,000 grass carp being stocked in a 15 mu grass carp pond; the grass carp are starved for one day and then fed for six consecutive days, then starved for one day and then fed for six consecutive days, and so on.

[0070] (4) Freshwater shrimp stocking: Freshwater shrimp fry are released in March and August respectively, with a stocking density of 2000-3000 shrimp / box and a specification of 1000-2000 shrimp / kg.

[0071] (5) Feeding: During the whole process of shrimp farming, a mixed feed of granular protein feed and corn (the mass ratio of granular protein feed to corn is 4:1) is fed once a day, at 4-5 pm, and the feeding amount is 6-10% of the shrimp body weight. In the early stage, it is calculated based on the weight of the shrimp in the pond and randomly sampled every month.

[0072] Grass carp are fed Tongwei pellet feed throughout the breeding process, twice a day, 8:30-9:30 in the morning and 5:00-6:00 in the afternoon. The feeding amount is 10% of the grass carp's early body weight, 8% of the middle body weight, and 6% of the late body weight (the early stage refers to the period from the release of seedlings to mid-July, the middle stage refers to mid-July to the end of October, and the late stage refers to the end of October to the end of breeding).

[0073] (6) Aquatic plant management: When patrolling the pond every day, pay attention to the growth of aquatic plants, apply fertilizer or cut off the aging aquatic plants to keep them fresh and tender. For ponds where aquatic plants are not growing well, appropriate fertilizer should be applied to the aquatic plant area, and areas with insufficient aquatic plants should be replanted or transplanted in a timely manner, so as to ensure that the aquatic plants in the pond are sparse and dense and arranged reasonably. The area of ​​aquatic plants should be maintained between 30% and 40% of the entire water surface. When the pond is closed due to excessive aquatic plants, several waterways in the north-south direction should be opened to facilitate the flow of water in the pond, maintain a good ecological environment in the pond, and facilitate feeding and management.

[0074] (7) Water quality management: In spring, before the release of grass carp and summer flounder, in order to increase the water temperature and promote the growth of freshwater shrimp, the water level can be controlled at 0.5-0.6m. In summer and autumn, the water temperature is higher, and the depth of the pond water should be maintained at 1.2-1.5m (after the release of grass carp and summer flounder, the high temperature period of summer has arrived. Taking into account the growth of grass carp and freshwater shrimp, the water level should not be lower than 1.2m). The water quality should be kept fresh throughout the process, and the aerator should be turned on frequently to maintain sufficient dissolved oxygen. The dissolved oxygen in the pond water should be maintained above 5mg / L. The pH value of the pond water should be maintained at 7.5-8.5. Change the water once a week in spring and once every 3 days in summer. In case of continuous high temperature, the water should be changed every day. In autumn, when the weather is hot, the water should be changed every 2 days, and the amount of water changed should account for 1 / 3 of the total water area.

[0075] (8) Grass carp fishing: The fishing time is from late November to December. The method of dragnet fishing is adopted. The water level of the pond can be appropriately lowered, and large grass carp can be separated into ponds to facilitate subsequent cultivation.

[0076] (9) Shrimp fishing: Shrimp are caught in July and January of the following year. The cages for shrimp farming are taken out by removing the fixed steel pipes. According to the size of the cages and the size of the shrimp, appropriate workers are selected to pull out the cages for shrimp farming. At this time, the shrimp have basically reached the commercial shrimp size of 8g-10g / tail and are sold after fishing.

[0077] In this embodiment, the pond area is 15 mu, and a total of 240,000 shrimp fry are put in (40 net cages are set in the grass carp pond, and they are put in twice a year), the recapture rate is 60%, and the average weight is 10g / tail. A total of 600kg of shrimp are caught and sold, with a net profit of 12,000 yuan; by feeding grass carp in a cycle of starvation and refeeding, the growth rate of grass carp is accelerated, the mortality rate is reduced, and the feed utilization rate is improved. The grass carp feed can be reduced by 15% per mu, saving 1 ton of feed and saving 6,000 yuan.

[0078] Example 2

[0079] This example is a feeding mode optimization experiment, that is, changing the cycle of starvation and refeeding mode to compare the breeding effect. The specific experimental groups are shown in Table 1 below (where the feeding method of experimental group 2 is the same as that of Example 1).

[0080] Table 1

[0081] Experimental Group Feeding mode 1 Normal feeding 2 Cyclic starvation and refeeding mode: starvation for 1 day and refeeding for 6 days 3 Cyclic starvation and refeeding mode: starvation for 2 days and refeeding for 5 days 4 Cyclic starvation and refeeding mode: starvation for 3 days and refeeding for 4 days

[0082] The grass carp is cultured in cages in an east-west grass carp pond according to the four-group feeding mode, with an effective culture area of ​​48m 3 150 grass carp summer flowers were cultured in each cage for 60 days.

[0083] After the breeding was completed, the total weight of the grass carp in each cage was weighed, and the growth data was tested. During the breeding process, the mortality rate and feed input of the grass carp were counted. The mortality rate of grass carp is shown in Table 2.

[0084] Table 2

[0085] Experimental Group mortality rate(%) 1 3 2 2 3 3 4 4

[0086] It can be seen from Table 2 that the mortality rates of the four experimental groups were all below 4%, namely 3%, 2%, 3%, and 4%, respectively. The mortality rate of experimental group 2 was the lowest, at 2%, indicating that the method of the present invention can significantly reduce the mortality rate of grass carp, ensure the survival rate of grass carp, and increase the breeding benefits. This is because the grass carp in experimental group 1 accumulates too much fat due to full feeding, and the grass carp's resistance to the outside world and disease resistance decrease, and the mortality rate increases; experimental groups 3 and 4, due to the long starvation time, it is difficult to replenish the energy in the grass carp.

[0087] The total weight of grass carp is shown in Table 3.

[0088] Table 3

[0089] Experimental Group Total weight (g) Total feeding amount (g) 1 5203 8264.0 2 6069.5 8657.3 3 4993.5 6734.9 4 4776 5809.0

[0090] It can be seen from Table 3 that the total weight of the grass carp in Experimental Group 2 is the largest, indicating that the cyclic starvation and refeeding mode of the present invention can significantly improve the growth rate of grass carp. This is because the grass carp in Experimental Group 2 obtained compensatory growth by increasing the feed intake, and the feed intake rate of Experimental Groups 3 and 4 increased to a certain extent, but the feed conversion efficiency decreased significantly, and no compensatory growth was obtained.

[0091] This specific implementation is only an explanation of the present invention, not a limitation of the present invention. Any changes made by those skilled in the art after reading the specification of the present invention will be protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A farming model based on pond-based grass carp cyclic starvation and refeeding with shrimp, characterized in that: Grass carp is cultured in a feeding method of cyclic starvation and refeeding, and a gentle slope and shrimp culture cages are set on the bank of the grass carp pond to culture shrimps; the shrimp culture cages are set on the gentle slope of the pond for shrimp culture and escape prevention.

2. The farming model of the grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 1 is characterized in that: The feeding method of the cycle of starvation and refeeding is to stop eating for one day before formal feeding, start formal feeding on the second day, and feed continuously for six days; then starve for one day, and then feed continuously for six days; This reciprocating cycle continues; The green shrimp breeding cage comprises a fishing net cage, a fixed steel pipe and an escape-proof opening; the fixed steel pipe fixes the cage on a gentle slope; and the escape-proof opening is located on the bank of a pond.

3. The farming model of grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 2, characterized in that: The following steps are involved: (1) Renovation of aquaculture ponds: including setting up gentle slopes and shrimp aquaculture cages beside grass carp ponds; (2) Preparation before aquaculture: including pond cleaning, disinfection, pond drying, fertilization and planting of aquatic plants; (3) Grass carp stocking: including grass carp selection and grass carp stocking; (4) Freshwater shrimp stocking: including the selection and release of freshwater shrimp fry; (5) Feeding: including feed selection, controlling feeding time and feeding amount; (6) Aquatic plant management: including aquatic plant species, aquatic plant cultivation, cutting and combing; (7) Water quality management: including water quality, water level, water temperature and water color; (8) Grass carp fishing: including fishing time and fishing methods; (9) Shrimp fishing: including fishing time and fishing methods.

4. The farming model of grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 3, characterized in that: In step (1), the grass carp pond is long from east to west and narrow from north to south, and is rectangular with four arc-shaped corners; the pond bank is 2-3m wide, the slope ratio is 1:2-3, the pond depth is 1.5-1.8m, and the area is 10-20 mu; a water inlet gate and a water outlet gate are respectively arranged at both ends of the grass carp pond, and a mesh with a mesh size of 0.6-0.8cm is arranged around the water inlet; the shrimp breeding cage is fixed to the bottom of the gentle slope with a fixed steel pipe, the fixed steel pipe is exposed 30cm above the water surface, and the escape prevention port is located at the edge of the pond for subsequent shrimp seed placement and feeding.

5. The farming model of grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 3, characterized in that: In step (3), the grass carp is summer grass carp, the stocking density is 40,000-60,000 per mu, and the stocking time is early June.

6. The farming model of grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 3, characterized in that: In step (4), the shrimp fry are 2000-3000 per box, with a specification of 1000-2000 per kg; the fry are released from early January to early March in spring breeding, and from late June to early August in autumn breeding.

7. The farming model of grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 3, characterized in that: In step (5), the grass carp is fed twice a day during the breeding process, at 8:30-9:30 in the morning and 5:00-6:00 in the afternoon; the feeding method is a cycle feeding of 6 consecutive days after starvation for 1 day; the feeding amount is 5-10% of the grass carp's body weight; During the shrimp farming process, feed once a day, at 4:00-5:00 p.m.; the feeding amount is 6-10% of the shrimp's body weight.

8. The farming model of grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 3, characterized in that: In step (7), the water depth in the grass carp pond is controlled at 0.5-0.6 m in spring and maintained at 1.2-1.5 m in summer, the dissolved oxygen in the water is not less than 5 mg / L, and the pH value of the water is maintained at 7-9.

9. The farming model of grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 3, characterized in that: In step (8), the grass carp is caught from late November to December using a dragnet method.

10. The farming model of grass carp cyclic starvation and refeeding and shrimp farming based on pond farming according to claim 3, characterized in that: In step (9), the prawns are harvested from June to July and from December to January of the following year, and the prawn culture cages are taken out by removing the fixed steel pipes.

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