Multi-round efficient breeding system and method for crayfishes in crayfish-rice mode

Abstract

The invention discloses a multi-round efficient breeding system and method for crayfishes in a crayfish-rice mode. The breeding system comprises a field surface adult crayfish breeding area, an inner ridge, a crayfish seed ditch, an outer ridge and a corridor, wherein the crayfish seed ditch is a crayfish seed breeding control area. The breeding method comprises the following steps: in May to June of the first year, putting shrimp seeds with the specification of more than 15g into shrimp seed ditches; in the period from June of the first year to February of the second year, the water level in the shrimp seed ditch is controlled in a gradually decreasing and rising mode; and in late February, late March and late April of the next year, catching a certain number of shrimp seeds in the shrimp seed ditches in batches, putting the shrimp seeds into the adult shrimp culture area on the field surface for culture, and catching adult shrimps. According to the breeding system and method, ecological breeding of shrimp seeds in batches and controllable breeding of adult shrimps in batches can be achieved, so that the breeding period is relatively prolonged, the marketing specification of the adult shrimps is improved, and the yield and benefits are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fishery science applications, and particularly to a multi-round high-efficiency breeding system and method for crayfish under the shrimp-rice mode. Background Art

[0002] Crayfish, scientifically named Procambarus clarkii, is a freshwater crayfish with strong environmental adaptability, wide food habits and fast growth. It is rich in nutrition and delicious in taste, and has now become an extremely important freshwater aquaculture economic shrimp species in the middle and lower reaches of the Yangtze River.

[0003] The "crayfish-rice" mode with paddy fields as the ecosystem is the most dominant mode of "rice-fish integrated farming" in China. Currently, the area of this mode accounts for more than 70% of the national crayfish farming area. The crayfish farming mode of "raising shrimp first and then planting rice" has advantages such as relatively low technical requirements and strong stability of ecological and economic benefits. However, another significant feature of this mode is that a large number of seedlings emerge successively from March to May, resulting in major defects in seedling production such as relatively concentrated emergence time, uncontrollable seedling quantity, and extremely uneven seedling specifications during the entire crayfish farming period. As a result, the size of the edible commercial shrimps raised is small and the yield is low. Currently, the main levels of the size and yield per unit area of edible commercial shrimps under this mode are about 25 g and 50 - 100 kg / 667 m 2 , respectively, so the aquaculture level and economic benefits are low. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-round high-efficiency breeding system and method for crayfish under the shrimp-rice mode, so as to solve the problem of low production efficiency of crayfish farming caused by uncontrollable seedling quantity and specifications in actual production.

[0005] To achieve the above technical objectives, one of the technical solutions of the present invention is a multi-round efficient breeding system for crayfish under the shrimp-rice mode, including a surface adult crayfish breeding area, an inner embankment, an inner embankment anti-escape net, a shrimp seedling ditch, an outer embankment, an outer embankment anti-escape net, a corridor, and a connecting anti-escape net. The surface adult crayfish breeding area is an adult crayfish breeding and production area with consistent flatness in the horizontal direction; the inner embankment is a dike surrounding the outside of the surface adult crayfish breeding area, and the bottom of its inner side is flush with the surface adult crayfish breeding area; the inner embankment anti-escape net is a facility composed of a dense net and support poles that surrounds the top of the inner embankment to prevent crayfish from escaping between the surface adult crayfish breeding area and the shrimp seedling ditch; the shrimp seedling ditch is located between the inner embankment and the outer embankment; the outer embankment is a dike surrounding the outside of the shrimp seedling ditch, and the bottom of its inner side is flush with the shrimp seedling ditch; the outer embankment anti-escape net is a crayfish anti-escape facility composed of a dense net and support poles that surrounds the inner top of the outer embankment; the corridor passes through the outer embankment, the shrimp seedling ditch, the inner embankment and is seamlessly connected to the surface adult crayfish breeding area; the connecting anti-escape net is an anti-escape device connecting the inner embankment anti-escape net and the outer embankment anti-escape net.

[0006] The cross-sections of the inner embankment, the outer embankment and the shrimp seedling ditch are all trapezoidal. The two sides of the shrimp seedling ditch are connected to the inner embankment and the outer embankment as inclined continuous slopes. The inner embankment, the shrimp seedling ditch and the outer embankment together form an artificial ecological ditch system for shrimp seedling breeding. The inner embankment and the outer embankment are both made of the soil excavated from the shrimp seedling ditch.

[0007] The second technical solution of the present invention is a method for breeding using the multi-round efficient breeding system for crayfish under the shrimp-rice mode, including:

[0008] S1. Shrimp seed stocking: From May to June of the first year, shrimp seeds with a specification of more than 15 g are put into the shrimp seedling ditch as breeding reserve parents for conventional breeding management. According to the total area surrounded by the inner side of the outer embankment of the shrimp seedling ditch, the stocking quantity of the shrimp seeds is 10 - 20 kg / 667 m 2 ; Water level control of the shrimp seedling ditch: From June of the first year to February of the second year, in order to force the mated parents to dig holes and hold eggs in the slopes on both sides of the shrimp seedling ditch in a timely manner, the water level in the shrimp seedling ditch is controlled in a gradually decreasing and rising manner. Specifically: the water level before mid-July is controlled at 110 - 90 cm, the water level from late July to early August is controlled at 90 - 70 cm, the water level from mid-August to the end of August is controlled at 70 - 50 cm, the water level in September is controlled at 50 - 30 cm, the water level from October to January of the second year is controlled at 10 - 30 cm, and the water level rises to 30 - 50 cm from the end of January to the end of February of the second year.

[0009] S2. In late February of the second year, fry in the fry ditch with a specification of 160 - 240 tails / kg are caught and released into the adult shrimp breeding area in the field surface for breeding. The number of fry caught and released is 3,000 tails / 667m 2 ; Management of the adult shrimp breeding area in the field surface: The water level in the adult shrimp breeding area in the field surface is maintained at 30 - 40 cm. The feed used during the breeding process is high-quality artificial compound feed for adult shrimp. Enough artificial compound feed is fed into the adult shrimp breeding area in the field surface every day. After 20 days of breeding and feeding, adult shrimp can be caught. From March 20th to early April, adult shrimp are successively caught and sold on the market. The total weight of the caught and marketed adult shrimp with an average specification of over 20 g can reach 40 - 60 kg / 667m 2 ; Management of the fry ditch: Continue to conduct water fertilization, waterweed maintenance, water level control, and control of the feeding amount of artificial feed in the fry stage for the fry in the fry ditch. The water level in the fry ditch rises to 50 - 80 cm, and the feeding amount of artificial feed is fed to satiety.

[0010] S3. In late March of the second year, fry in the fry ditch with a specification of 120 - 200 tails / kg are caught and released into the adult shrimp breeding area in the field surface for breeding. The number of fry caught and released is 4,000 tails / 667m 2 ; Management of the adult shrimp breeding area in the field surface: The water level in the adult shrimp breeding area in the field surface is maintained at 40 - 50 cm. The feed used during the breeding process is high-quality artificial compound feed for adult shrimp. Enough of the artificial feed is fed into the adult shrimp breeding area in the field surface every day. After 20 days of breeding and feeding, adult shrimp can be caught. Starting from April 20th, adult shrimp are caught and sold on the market successively every 5 - 7 days. The total weight of the caught and marketed adult shrimp with an average specification of 30 - 35 g can reach over 100 kg / 667m 2 ; Management of the fry ditch: Continue to conduct waterweed maintenance, water level control, and control of the feeding amount of artificial feed in the fry stage for the fry in the fry ditch. The water level rises to 80 - 120 cm, and the feeding amount of artificial feed is 30% - 50% of the feeding amount fed to satiety.

[0011] S4. In late April of the second year, fry in the fry ditch with a specification of 120 - 200 tails / kg are caught and released into the adult shrimp breeding area in the field surface for breeding. The number of fry caught and released is 4,000 tails / 667m 2; Management of the adult shrimp breeding area on the paddy field surface: The water level in the adult shrimp breeding area on the paddy field surface is maintained at 40 - 50 cm. The feed used during the breeding process is high-quality artificial compound feed for adult shrimp. The artificial compound feed is fed in sufficient quantity in the adult shrimp breeding area on the paddy field surface every day. After 20 days of breeding and feeding, adult shrimp can be fished. Starting from May 20th, adult shrimp are fished and sold successively every 5 - 7 days. The total weight of the fished and sold adult shrimp with an average specification of 30 - 35 g can reach 100 kg / 667 m 2 or more. During this adult shrimp breeding period, due to the relatively high air temperature and water temperature, special attention should be paid to strengthening the monitoring and regulation of the breeding water environment, such as pest control of aquatic plants, water change, and using microecological agents to adjust water quality, etc., to maintain excellent breeding water quality and appropriately feed bio-fermented feed; Management of the shrimp seedling trench: Continue to carry out aquatic plant maintenance, water level control, and control of the feeding amount of artificial feed during the shrimp seedling stage in the shrimp seedling trench. The water level drops to 80 - 50 cm, and the feeding amount of artificial feed is 10% - 30% of the full-feeding amount.

[0012] Compared with the prior art, the beneficial effects of the present invention include:

[0013] The multi-round high-efficiency breeding system and method for crayfish under the shrimp-rice mode provided by the present invention can achieve the following specific beneficial effects:

[0014] (1) Timely burrowing and inhabiting of broodstock shrimp: By controlling the water level in the shrimp seedling trench, the mated parents can be forced to burrow and hold eggs on the slopes on both sides of the shrimp seedling trench in a timely manner, and the continuous slopes on both sides of the shrimp seedling trench provide continuous burrowing space and suitable cave inhabiting environment for the broodstock shrimp (female parent);

[0015] (2) In-situ production of shrimp seedlings: The shrimp seedling trench can provide nearby and in-situ size seedlings for paddy field adult shrimp breeding. Therefore, the seedlings have strong adaptability, high survival rate, and basically no seedling transportation cost; If the number of seedlings in the shrimp seedling trench is insufficient due to uncontrollable factors, the seedlings in the shrimp seedling trench can be continuously and controllably cultivated by deepening the water level, strengthening feeding, and supplementing seedlings nearby in advance, etc., to meet the needs of multiple batches of adult shrimp breeding;

[0016] (3) Timely cultivation of shrimp seedlings: By controlling the water level in the shrimp seedling trench, the timely emergence and cultivation of shrimp seedlings can be controlled, thus realizing the batch cultivation production of shrimp seedlings, which can meet the needs of multiple batches of adult shrimp breeding;

[0017] (4) Controllable cultivation of shrimp seedlings: Through the controlled management of the water level and feed feeding in the shrimp seedling trench, multiple batches of seedlings can be produced and controllably cultivated, without using corresponding drugs to kill some of the overly dense shrimp seedlings. Therefore, it is an ecological, environmentally friendly, and healthy shrimp seedling cultivation method;

[0018] (5)Controlled cultivation of adult shrimp: By controlling the stocking time, quantity, and specifications of shrimp seedlings, it is possible to achieve controlled cultivation density of adult shrimp, large cultivated specifications, and continuous listing throughout the cultivation cycle.

[0019] (6)High yield of adult shrimp cultivation: The adult shrimp cultivation method provided by the present invention has strong operability and can relatively extend the adult shrimp cultivation cycle in paddy fields, thereby increasing the yield of adult shrimp throughout the cultivation cycle. Description of the drawings

[0020] Figure 1 is a top view of the multi-round high-efficiency cultivation system of crayfish under the shrimp-rice mode provided by the present invention; Figure 2 is Figure 1 the cross-sectional view of

[0021] Description of the reference numerals: 1 - Adult shrimp cultivation area on the paddy field surface, 2 - Inner embankment, 3 - Shrimp seedling ditch, 4 - Outer embankment, 5 - Corridor, 6 - Inner embankment anti-escape net, 7 - Outer embankment anti-escape net, 8 - Connecting anti-escape net. Detailed implementation manners

[0022] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] Embodiment - 1

[0024] As Figure 1 and Figure 2 shown, the cultivation system of Embodiment 1 is a multi-round high-efficiency cultivation system of crayfish under the shrimp-rice mode, and the cultivation system includes an adult shrimp cultivation area 1 on the paddy field surface, an inner embankment 2, a shrimp seedling ditch 3, an outer embankment 4, a corridor 5, an inner embankment anti-escape net 6, an outer embankment inner anti-escape net 7, and a connecting anti-escape net 8.

[0025] The inner embankment 2 surrounds the outer side of the adult shrimp cultivation area 1 on the paddy field surface in a circle, and the bottom inside the inner embankment 2 is flush with the adult shrimp cultivation area 1 on the paddy field surface; the shrimp seedling ditch 3 is located between the inner embankment 2 and the outer embankment 4, and the cross-sections of the inner embankment 2, the outer embankment 4, and the shrimp seedling ditch 3 are all trapezoidal. The two sides of the shrimp seedling ditch 3 are connected to the inner sides of the inner embankment 2 and the outer embankment 4 to form an inclined continuous slope, and the corridor 5 passes through the outer embankment 4, the shrimp seedling ditch 3, the inner embankment 2 and is connected to the adult shrimp cultivation area 1 on the paddy field surface.

[0026] The corridor 5 is a corridor with a width of 3.5 - 4.0 m located at a corner of the paddy field, seamlessly connected to the adult shrimp cultivation area 4 on the paddy field surface. Its horizontal plane height is the same as that of the top surface of the outer embankment. Its function is to facilitate access to the adult shrimp cultivation area 1 on the paddy field surface for aquaculture management operations (such as aquatic plant planting, water quality regulation, and feed feeding) and subsequent planting management operations (such as rice planting and its field management, etc.).

[0027] The shrimp fry ditch 3, the outer embankment 4, and the inner embankment 2 together constitute a shrimp fry breeding artificial ecological ditch system. The two side slopes of the shrimp fry ditch 3 can provide a burrowing space and a suitable cave habitat environment for egg-carrying shrimp (female parent) from autumn and winter to early spring. Moreover, the emergence time of the egg-carrying shrimp can be controlled by artificially adjusting the water level of the shrimp fry ditch 3, thereby controlling the batch cultivation time and cultivation density of shrimp fry.

[0028] The area of the shrimp fry ditch 3 does not exceed 15% of the total area enclosed by the inner side of the outer embankment 4 of the shrimp fry ditch. The slope ratio (H3:L4) and slope height H3 (relative to the bottom of the shrimp fry ditch) of the outer embankment 4 are 1:2 and 150 cm respectively; the inner embankment 2 is located on the paddy field platform 1, and its cross-section is a regular trapezoid. Its bottom width, top width, and slope height (relative to the paddy field platform) are 120 cm, 50 cm, and 60 cm respectively.

[0029] The slope ratio (H2:L2) and slope height (relative to the bottom of the shrimp fry ditch 3) of the slope on the side of the shrimp fry ditch 3 close to the paddy field surface are 1:1.25 and 80 cm respectively.

[0030] Figure 2 In it, L1 is 120 cm, L2 is 100 cm, L3 is 100 cm, and L4 is 300 cm. The cross-sectional areas of the shrimp fry ditch and the outer embankment are close to each other.

[0031] To provide a breeding ecological environment for the shrimp fry leaving the egg-carrying shrimp (female parent) to inhabit and grow, aquatic plant belts such as Alternanthera philoxeroides are continuously and evenly planted on the two side slopes of the shrimp fry ditch 3 during the shrimp fry cultivation period.

[0032] To control the water level in the shrimp fry ditch 3, the aquaculture system further includes a water inlet and drainage device (not shown in the figure). The water inlet and drainage device includes a water inlet pipe and a drainage pipe. The water inlet pipe includes a connected water inlet main pipe, multiple water inlet shunt pipes, and a water inlet valve. Multiple water inlet shunt pipes are arranged inside the outer embankment, and a water inlet valve is provided on each water inlet shunt pipe.

[0033] To provide sufficient dissolved oxygen in the water body for the shrimp fry inhabiting the shrimp fry ditch, the aquaculture system further includes an aeration device (not shown in the figure). The aeration device includes an air compressor, a gas pipeline, and an aerator. The air compressor is a mechanical device that provides high-pressure input air to the gas pipeline; the gas pipeline includes a connected gas main pipe and gas shunt pipes. Both ends of the gas main pipe are respectively connected to the air compressor and the gas shunt pipes, and multiple gas shunt pipes are connected to multiple aerators in a one-to-one correspondence. Multiple aerators are oxygen supply outlets evenly distributed at the bottom of the shrimp fry ditch.

[0034] To prevent the adult crayfish from escaping between the adult crayfish aquaculture area 1 on the paddy field surface and the shrimp fry ditch 3, a circle of inner embankment anti-escape net 6 is provided at the top of the inner embankment 2. The inner embankment anti-escape net includes a dense net and multiple support poles supporting the dense net. Multiple support poles are arranged at intervals and surround the inner embankment 2 in a circle. The height of the dense net is 50 cm, and the mesh density is 80 - 120 meshes; the support poles are bamboo poles with a length of 100 cm and hard texture. The insertion depth and insertion spacing of the support poles into the soil at the top of the inner embankment 2 are 50 cm and 150 cm respectively, and the inner embankment anti-escape net and the support poles incline 15° towards the adult crayfish aquaculture area 1 on the paddy field surface.

[0035] To prevent the shrimp fry in the shrimp fry ditch from climbing over the outer embankment 4 and escaping, a circle of outer embankment anti-escape net 7 is provided on the inner side of the outer embankment 4. The outer embankment anti-escape net includes a dense net and multiple support poles supporting the dense net. Multiple support poles are arranged at intervals and surround the outer embankment 4 in a circle. The support poles are bamboo poles with a length of 80 cm and hard texture. The height of the dense net is 50 cm. The insertion depth and insertion spacing of the support poles into the soil on the inner side of the outer embankment 4 are 30 cm and 150 cm respectively, and the dense net support poles incline 15° towards the shrimp fry ditch.

[0036] To prevent the shrimp fry in the shrimp fry ditch from climbing over the corridor 5 and escaping, connecting anti-escape nets 8 are respectively provided at the outer ends on both sides of the corridor 5, and the connecting anti-escape nets 8 are seamlessly connected to both the inner embankment anti-escape net 6 and the outer embankment anti-escape net 7. The production and setting of the connecting anti-escape nets 8 are consistent with the corresponding requirements of the outer embankment anti-escape net 7.

[0037] On the one hand, the multi-round high-efficiency aquaculture system for crayfish under the shrimp-rice mode provided by the present invention can provide in-situ and nearby specification fry for paddy field adult crayfish aquaculture. Therefore, the adaptability of the fry is strong, the survival rate is high, and there is basically no fry transportation cost. On the other hand, it can achieve controllable aquaculture of paddy field adult crayfish in terms of aquaculture density and growth specification.

[0038] Under the conditions of the above-mentioned aquaculture system, the aquaculture method of Example 1 includes:

[0039] S1. Shrimp seed stocking: From May to June of the first year, stock shrimp seeds with a specification of over 15 g into the shrimp seedling trench as breeding reserve parents for conventional aquaculture management; calculated according to the total area enclosed by the inner side of the outer ridge of the shrimp seedling trench, the stocking quantity of the shrimp seeds is 15 kg / 667 m 2 ; Water level control in the shrimp seedling trench (from June to February of the second year): The water level is controlled at 110 cm before mid-July, 90 cm from late July to early August, 70 cm from mid-August to the end of August, 50 cm in September, and 10 cm from October to January of the second year; The water level rises to 30 - 40 cm from the end of January to the end of February of the second year.

[0040] S2. Starting from February of each year in the second year, catch the shrimp seedlings in the shrimp seedling trench with a specification of 160 - 240 tails / kg by conventional methods and stock them into the adult shrimp cultivation area of the field surface for cultivation. The quantity of the caught and stocked shrimp seedlings is 3000 tails / 667 m 2 ; Management of the adult shrimp cultivation area of the field surface: The water level in the adult shrimp cultivation area of the field surface is maintained at 30 - 35 cm. The feed fed during the cultivation process is high-quality artificial compound feed for adult shrimp. Feed the artificial compound feed in sufficient quantity in the adult shrimp cultivation area of the field surface every day. After 20 days of cultivation and feeding, the first adult shrimp catch can be carried out every year. Adult shrimp are successively caught and sold on the market from March 20th to early April; Management of the shrimp seedling trench: Continue to carry out fertilizer water, waterweed maintenance, water level control, and control of the feeding amount of artificial feed in the shrimp seedling stage for the shrimp seedlings in the shrimp seedling trench. The water level in the shrimp seedling trench rises by 60 - 70 cm in late February of the second year, and the feeding amount of artificial feed is full feeding.

[0041] S3. Starting from March of each year in the second year, catch the shrimp seedlings in the shrimp seedling trench with a specification of 120 - 200 tails / kg by conventional methods and stock them into the adult shrimp cultivation area of the field surface for cultivation. The quantity of the caught and stocked shrimp seedlings is 4000 tails / 667 m 2 ; Management of the adult shrimp cultivation area of the field surface: The water level in the adult shrimp cultivation area of the field surface is maintained at 40 - 50 cm. The feed fed during the cultivation process is high-quality artificial compound feed for adult shrimp. Feed the artificial compound feed in sufficient quantity in the adult shrimp cultivation area of the field surface every day. After 20 days of cultivation and feeding, the second adult shrimp catch can be carried out every year. Adult shrimp are successively caught and sold on the market 5 - 7 days after April 20th; Management of the shrimp seedling trench: Continue to carry out waterweed maintenance, water level control, and control of the feeding amount of artificial feed in the shrimp seedling stage for the shrimp seedlings in the shrimp seedling trench. The water level rises to 100 - 110 cm, and the feeding amount of artificial feed is 30% of the full feeding amount.

[0042] S4. In late April of each year starting from the second year, fry in the fry ditch with a specification of 120 - 200 tails / kg are caught and released into the adult shrimp cultivation area of the field surface for cultivation. The number of fry caught and released is 4000 tails / 667m 2 ; Management of the adult shrimp cultivation area of the field surface: The water level in the adult shrimp cultivation area of the field surface is maintained at 45 - 50 cm. The feed used during the cultivation process is high-quality artificial compound feed for adult shrimp. The artificial compound feed is fed in sufficient quantity in the adult shrimp cultivation area of the field surface every day. After 20 days of cultivation and feeding, the third harvest of adult shrimp can be carried out every year. Starting from May 20th, adult shrimp are harvested successively every 5 - 7 days and sold on the market. During this adult shrimp cultivation period, due to the relatively high air temperature and water temperature, special attention should be paid to strengthening the monitoring and regulation of the aquaculture water environment, such as pest control of aquatic plants, water change, and using microecological agents to adjust the water quality, etc., to maintain excellent aquaculture water quality and appropriately feed bio-fermented feed; Management of the fry ditch: Continue to carry out aquatic plant maintenance, water level control, and control of the feeding amount of artificial feed at the fry stage in the fry ditch. The water level drops to 60 - 50 cm, and the feeding amount of artificial feed is 15% of the full-feeding amount.

[0043] Example - 2

[0044] Example 2 is cultivated using the same aquaculture system as Example 1, and the cultivation steps are basically the same. The differences are as follows:

[0045] S1. During the period from June to February of the second year, the water level in the fry ditch is controlled as follows: The water level is controlled at 90 cm before mid-July, 70 cm from late July to early August, 50 cm from mid-August to the end of August, 40 cm in September, and 30 cm from October to January of the second year; The water level rises to 50 cm from the end of January to late February of the second year.

[0046] S2. In late February of each year starting from the second year, the water level in the adult shrimp cultivation area of the field surface is maintained at 30 cm; The water level in the fry ditch rises to 50 cm in late February of the second year.

[0047] S3. In late March of each year starting from the second year, the water level in the adult shrimp cultivation area of the field surface is maintained at 40 cm; The water level in the fry ditch rises to 120 cm, and the feeding amount of artificial feed is 50% of the full-feeding amount.

[0048] S4. In late April of each year starting from the second year, the water level in the adult shrimp cultivation area of the field surface is maintained at 60 cm; The water level in the fry ditch drops to 80 - 70 cm, and the feeding amount of artificial feed is 30% of the full-feeding amount.

[0049] Example - 3

[0050] Example 3 is cultured using the same aquaculture system as in Example 1, and the culturing steps are basically the same. The differences are as follows:

[0051] S1. During the period from June to February of the following year, the water level in the shrimp fry ditch is controlled as follows: before mid-July, the water level is controlled at 100 cm; from late July to early August, the water level is controlled at 80 cm; from mid-August to the end of August, the water level is controlled at 60 cm; in September, the water level is controlled at 50 cm; from October to January of the following year, the water level is controlled at 20 cm; from the end of January of the following year to late February of the following year, the water level rises to 40 cm.

[0052] S2. In late February of each year starting from the second year, the water level in the adult shrimp farming area on the field surface is maintained at 25 cm; in late February of the second year, the water level in the shrimp fry ditch rises to 60 cm.

[0053] S3. In late March of each year starting from the second year, the water level in the adult shrimp farming area on the field surface is maintained at 35 cm; the water level in the shrimp fry ditch rises to 80 cm, and the feeding amount of artificial feed is 40% of the full-feeding amount.

[0054] S4. In late April of each year starting from the second year, the water level in the adult shrimp farming area on the field surface is maintained at 55 cm; the water level in the shrimp fry ditch drops to 60 cm, and the feeding amount of artificial feed is 20% of the full-feeding amount.

[0055] Effect of the example

[0056] Breeding and culturing are carried out using Example 1, Example 2, and Example 3 of the present invention, and adult shrimp are fished in batches at the end of March to early April, late April, and late May of the second year. The aquaculture effects are shown in Table 1.

[0057] Table 1

[0058]

[0059] It can be seen from Table 1 that compared with the existing technology in which "shrimp are cultured first and then rice is planted", resulting in a relatively concentrated seedling emergence time, uncontrollable seedling quantity, and extremely uneven seedling specifications during the crayfish culture period, the aquaculture level is about 25 g and 50 - 100 kg / 667 m 2 , respectively. By using the method of batch cultivation of shrimp fry and batch fishing in the second year in the present embodiment, the aquaculture level of adult shrimp with a specification of more than 25 g reaches 230 kg / 667 m 2 or more. Therefore, using the present embodiment can significantly improve the aquaculture level, and can be continuously marketed to improve economic benefits.

[0060] The cultivation method provided by the present invention controls the real-time emergence from the holes and the cultivation time of the shrimp fries on the slopes on both sides of the shrimp fry trench by controlling the water level, so as to realize the cultivation of shrimp fries in batches and meet the needs of multi-batch cultivation of adult shrimps in paddy fields.

[0061] The cultivation method provided by the present invention ensures multi-batch emergence and conducts controlled cultivation thereof through the control of the water level in combination with the feeding control of feed, without using corresponding drugs to kill some of the shrimp fries due to excessive density. Therefore, it is an ecological and environment-friendly shrimp fry cultivation method. If the number of fry in the shrimp fry trench is insufficient due to the influence of specific uncontrollable forces, the water level can be deepened and the feeding can be strengthened, or even by purchasing a certain number of shrimp fries in advance and nearby and putting them into the shrimp fry trench, and continuing to conduct controlled cultivation on the shrimp fries in the shrimp fry trench to meet the needs of multi-batch cultivation of adult shrimps in paddy fields.

[0062] This adult shrimp cultivation method has a controllable cultivation density, a large growth specification and can be continuously marketed throughout the cultivation cycle.

[0063] This method not only has strong operability but also relatively prolongs the cultivation cycle of adult shrimps in paddy fields. Therefore, the cultivation output throughout the cultivation cycle is increased, and it has great popularization value.

[0064] The specific implementation manners of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A multi-round efficient breeding system for crayfish in a shrimp-rice mode, characterized in that: The invention comprises an adult shrimp breeding area on the field surface, an inner ridge, an inner ridge escape prevention net, a shrimp seedling ditch, an outer ridge, an outer ridge escape prevention net, a corridor and a connection escape prevention net. The inner ridge surrounds the outer side of the adult shrimp breeding area on the field surface, and the bottom of the inner side of the inner ridge is flush with the adult shrimp breeding area on the field surface; the shrimp seedling ditch is between the inner ridge and the outer ridge; the corridor passes through the outer ridge, the shrimp seedling ditch, the inner ridge, the adult shrimp breeding area on the field surface and is flush with the field surface of the adult shrimp breeding area.

2. The multi-round efficient crayfish breeding system under the shrimp-rice model according to claim 1 is characterized in that: The outer slope of the shrimp seedling ditch and the inner slope of the outer ridge are continuous slopes with a slope ratio of 1:2, and the slope ratio of the inner slope of the shrimp seedling ditch is 1:1.

25.

3. The multi-round efficient crayfish breeding system under the shrimp-rice model according to claim 2 is characterized in that: The slope height of the outer ridge is 150 cm, the slope height of the shrimp seedling ditch is 80 cm, the cross section of the inner ridge is a regular trapezoid, and the bottom width, top width and slope height of the inner ridge are 120 cm, 50 cm and 60 cm respectively.

4. The multi-round efficient crayfish breeding system under the shrimp-rice model according to claim 3 is characterized in that: The outer ridge anti-escape net is arranged on the inner side of the outer ridge, the inner ridge anti-escape net is arranged on the inner ridge, and the connecting anti-escape net is arranged on both sides of the corridor, and the two ends are respectively connected to the outer ridge anti-escape net and the inner ridge anti-escape net.

5. The multi-round efficient crayfish breeding system under the shrimp-rice model according to claim 4 is characterized in that: The outer ridge anti-escape net and the connecting anti-escape net both include a dense net and a plurality of support poles supporting the dense net, the height and mesh density of the dense net are 60 cm and 80-120 meshes respectively, the support poles are made of hard bamboo poles, the cutting depth of the support poles is 20-40 cm, the spacing between two adjacent support poles is 150-200 cm, and the dense net and the support poles are inclined 15° toward one side of the shrimp seedling ditch; the inner ridge anti-escape net includes a dense net and a plurality of support poles supporting the dense net, the height and mesh density of the dense net are 50 cm and 80-120 meshes respectively, the cutting depth of the support poles in the soil at the top of the inner ridge of the shrimp seedling ditch is 40-60 cm, the spacing between two adjacent support poles is 150-200 cm, and the dense net and the support poles are inclined 15° toward one side of the adult shrimp breeding area on the field surface.

6. A method for cultivating crayfish using the multi-round efficient cultivation system of shrimp-rice mode according to any one of claims 1 to 5, characterized in that: Includes steps: S1. Shrimp seed placement and shrimp seed ditch water level control: from May to June of the first year, shrimp seeds with a size of more than 15g are placed in the shrimp seed ditch; from June of the first year to February of the second year, the water level in the shrimp seed ditch is controlled by gradual decrease and recovery, specifically: the water level before late July is controlled at 110-90cm, the water level from late July to early August is controlled at 90-70cm, the water level from mid-August to the end of August is controlled at 70-50cm, the water level in September is controlled at 50-30cm, the water level from October to January of the following year is controlled at 30-10cm, and the water level from the end of January of the second year to the end of February of the second year is recovered to 30-50cm. S2. In late February of the second year, shrimp fry with a size of 160 to 240 shrimps / kg in the shrimp fry ditch are caught and released into the adult shrimp breeding area on the field for breeding. At the same time, breeding management is carried out for the adult shrimp breeding area on the field and the shrimp fry ditch. S3. In late March of the second year, the shrimp fry with a size of 120 to 200 shrimps / kg in the shrimp fry ditch are caught and released into the adult shrimp breeding area on the field for breeding. At the same time, breeding management is carried out on the adult shrimp breeding area on the field and the shrimp fry ditch. S4. In late April of the second year, the shrimp fry with a size of 120 to 200 shrimp fry / kg in the shrimp fry ditch are caught and released into the adult shrimp breeding area on the field for breeding. At the same time, breeding management is carried out on the adult shrimp breeding area on the field and the shrimp fry ditch.

7. The method for efficient multi-round breeding of crayfish in the shrimp-rice mode according to claim 6, characterized in that: In S1, the amount of shrimp seed released is 20-30 kg / 667 m according to the total area enclosed by the inner side of the outer bank of the shrimp seed ditch. 2 .

8. The method for efficient multi-round breeding of crayfish in the shrimp-rice mode according to claim 7, characterized in that: The number of shrimp fry caught in S2 and released into the field surface shrimp culture area is 3000 / 667m 2 ; Management of adult shrimp breeding areas on the field: The water level in the adult shrimp breeding areas on the field is maintained at 30-40 cm, and the feed is fed in sufficient amounts. After about 20 days of breeding and feeding, the first adult shrimp harvest is carried out; Management of shrimp seedling ditches: In the second year, the water level in the shrimp seedling ditch rises to 50-80 cm, and the feed amount is fed to satiation.

9. The method for efficient multi-round cultivation of crayfish in the shrimp-rice mode according to claim 8, characterized in that: The number of shrimp fry caught in S3 and released into the field surface shrimp culture area is 4000 / 667m 2 ; Management of adult shrimp breeding areas on the field: the water level in the adult shrimp breeding areas on the field is maintained at 40-50 cm, the feed is fed in sufficient amounts, and the second adult shrimp harvest is carried out after 20 days of feeding; Management of shrimp seedling ditches: the water level in the shrimp seedling ditches is controlled at 80-120 cm, and the feeding amount is 30%-50% of the feeding amount for full feeding.

10. The method for efficient multi-round cultivation of crayfish in the shrimp-rice mode according to claim 9, characterized in that: The number of shrimp fry caught in S4 and released into the field surface adult shrimp breeding area is 4000 / 667m 2 ; Management of adult shrimp breeding areas on the field: the water level in the adult shrimp breeding areas on the field is maintained at 40-50 cm, the feed is fed in sufficient amounts, and the third adult shrimp harvest is carried out after 20 days of feeding; Management of shrimp seedling ditches: the water level in the shrimp seedling ditches drops to 80-50 cm, and the feed amount is 10%-30% of the full feeding amount.

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