Pseudosciaena crocea mariculture net cage and pseudosciaena crocea iridovirus control method

Abstract

The invention relates to a larimichthys crocea mariculture net cage and a larimichthys crocea iridovirus prevention and control method. The larimichthys crocea mariculture net cage comprises a net cage body, and a culture area is arranged in the net cage body; one end of the water inlet main pipe extends out of the culture area of the net cage body, and a medicine adding pipe and a fresh water adding pipe are arranged at the end, extending out of the culture area, of the water inlet main pipe; the water outlet pipe is arranged in the culture area of the net cage body, and a water outlet hole is formed in the bottom of the water outlet pipe; the water pushing pump is arranged between the water inlet main pipe and the water outlet pipe and is used for feeding water in the water inlet main pipe into the water outlet pipe; one end of the water inlet branch pipe is connected to the water inlet main pipe, the other end of the water inlet branch pipe is provided with an air inlet small pipe and a water inlet, the air inlet small pipe extends out of the culture area of the net cage body, and the water inlet is used for pumping water on the water surface. Deep water oxygenation of the culture area in the flat tide period is achieved, medicine and fresh water can be fed into the depth of the culture area, and prevention and control over the bodworm and the cryptocaryon irritans are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aquaculture, in particular to a large yellow croaker offshore net cage and a large yellow croaker iridovirus prevention and treatment method. BACKGROUND

[0002] At present, offshore net cages are mainly used for large yellow croaker aquaculture. Offshore net cage aquaculture has a large water space, can utilize natural seawater exchange to replace water, and has low cost, so it has become a mainstream aquaculture mode. However, offshore net cages are in open waters, and have the disadvantages that the water environment cannot be controlled, and the disease prevention and control means are limited.

[0003] The water depth of the large yellow croaker offshore net cage is generally 8 to 10 meters, and water replacement is mainly achieved by ebb and flow tides. During the slack tide period, the dissolved oxygen content in the net cage is low due to the lack of water flow. In the high temperature season, the dissolved oxygen in the net cage is even less than 4 mg / L. If there is feeding, the dissolved oxygen will decrease more quickly. Under the condition of insufficient dissolved oxygen, the feed utilization rate of large yellow croaker will decrease, and various diseases will also occur. Various diseases are prone to occur in open waters, and the occurrence of diseases is different in different seasons. Parasitic diseases such as stimulation of cryptosporidium and bennidium often occur. These parasitic diseases need to be treated by medicated bath, but it is difficult to reach the bottom layer by spraying in the open sea environment, and the drug effect cannot be achieved. SUMMARY

[0004] In view of the above problems, the present application provides a large yellow croaker offshore net cage and a large yellow croaker iridovirus prevention and treatment method, which solves the problem that the existing large yellow croaker offshore net cage has low dissolved oxygen content in the net cage and diseases occur during the slack tide period due to the lack of water flow, and the drug cannot reach the bottom layer for treatment, and the drug effect cannot be achieved.

[0005] To achieve the above-mentioned purpose, the inventors provide a large yellow croaker offshore net cage, which comprises:

[0006] A net cage body is provided with a culture area inside, and the culture area is used for culturing large yellow croaker;

[0007] A water inlet main pipe is provided with a drug adding pipe and a fresh water adding pipe at one end thereof which extends out of the culture area of the net cage body;

[0008] A water outlet pipe is provided in the culture area of the net cage body, and the bottom of the water outlet pipe is provided with a water outlet hole;

[0009] A water pushing pump is arranged between the water inlet main pipe and the water outlet pipe, and the water pushing pump is used for sending the water in the water inlet main pipe into the water outlet pipe;

[0010] A water inlet branch pipe is connected to one end of the water inlet main pipe, and the other end of the water inlet branch pipe is provided with an air inlet small pipe and a water inlet, the air inlet small pipe extends out of the culture area of the net cage, and the water inlet is used to suck water on the water surface.

[0011] In some embodiments, the water inlet branch pipe is multiple.

[0012] In some embodiments, the water inlet of the water inlet branch pipe is provided with a dosing net.

[0013] In some embodiments, a valve is arranged on the water inlet branch pipe.

[0014] In some embodiments, a small air hole is arranged on the water inlet main pipe.

[0015] Another technical solution is also provided, which is a method for preventing and treating rainbow trout iridovirus, and the method uses the offshore aquaculture net cage as described above, and includes the following steps:

[0016] During the feeding period, a first preset proportion of radix notoginseng extract is added to the feed of the large yellow croaker in the culture area for a first preset number of days;

[0017] A second preset proportion of florfenicol is added to the feed of the large yellow croaker in the culture area for a second preset number of days, and a water pump is started to oxygenate the water in the culture area during the low tide period;

[0018] Feeding of the large yellow croaker in the culture area is suspended for a third preset number of days;

[0019] A third preset proportion of doxycycline is added to the feed of the large yellow croaker in the culture area for a fourth preset number of days, and the water pump is started to oxygenate the water in the culture area during the low tide period;

[0020] Feeding of the large yellow croaker in the culture area is suspended for a fifth preset number of days.

[0021] In some embodiments, the first preset number of days is three days, and the second, third, fourth and fifth preset numbers of days are all one day.

[0022] In some embodiments, the first preset proportion is 2.5-3.5 g / kg.

[0023] In some embodiments, the second preset proportion is 0.8-1.2 g / kg.

[0024] In some embodiments, the third preset proportion is 0.8-1.2 g / kg.

[0025] Differing from the prior art, the technical scheme has the following beneficial effects: when large yellow croakers are bred, the net cage body is put into the sea, so that the breeding area of the net cage body is covered with seawater, and the large yellow croakers are bred in the breeding area; one end of the water inlet main pipe extends out of the breeding area and the sea level, so that the breeder can add drugs or fresh water through the drug adding pipe or the fresh water adding pipe on the water inlet main pipe, and at the same time, the water inlet branch pipe is connected to the water inlet main pipe, and the air inlet small pipe on the water inlet main pipe is used to oxygenate the water in the deep part of the breeding area. When the water in the breeding area is oxygenated during the slack tide period, the water on the water surface is sucked into the water inlet main pipe through the water inlet on the water inlet main pipe by the water pushing pump, and the air inlet small pipe on the water inlet branch pipe sucks in air, so that the micro-bubbles are sucked into the water in the air inlet branch pipe to increase the dissolved oxygen in the water in the air inlet branch pipe. During the operation of the water pushing pump, the water on the water surface is sucked into the air inlet pipe and then sent into the water outlet pipe, and then sent into the bottom of the breeding area through the water outlet of the water outlet pipe, so that the water in the breeding area is oxygenated during the slack tide period, and the problem of low dissolved oxygen during the slack tide period is solved. When the bennettia disease needs to be prevented and treated, the fresh water adding pipe on the water inlet main pipe is connected to the fresh water source, and the water inlet branch pipe is closed, so that the fresh water in the fresh water source is sucked in and discharged from the water outlet of the water outlet pipe by the water pushing pump, and a low-salinity area is formed in the breeding area for a short time, so that the bennettia is stimulated to fall off under the stimulation of the fresh water, and the disease is alleviated. When the cryptocaryon irritans disease needs to be prevented and treated, the drug adding pipe is connected to the drug application barrel for adding drugs such as artemisinin, and according to the volume of the net cage, the concentration of the drugs in the drug application barrel and the flow rate of the water pushing pump, the drugs and the water on the water surface are mixed and then sent into the deep part of the breeding area by the water pushing pump during the slack tide period, so that the high-concentration medicated bath state in the breeding area can be maintained for a short time, the cryptocaryon irritans is stimulated to fall off, and the disease is alleviated.

[0026] The above summary of the application is only a summary of the technical scheme of the present application. In order to enable those skilled in the art to more clearly understand the technical scheme of the present application, and then implement the content recorded in the specification and drawings, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more easily understood, the following will be described in combination with the specific embodiments of the present application and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings are only used to show the principles, implementation manners, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as limitations of the present application.

[0028] In the drawings of the specification:

[0029] Figure 1 A structural schematic view of the large yellow croaker offshore breeding net cage described in the specific embodiments;

[0030] Figure 2This is a schematic diagram of another structure of the marine aquaculture cage for large yellow croaker described in the specific implementation method;

[0031] Figure 3 This is a schematic diagram of one possible structure of the water inlet branch pipe described in a specific embodiment;

[0032] Figure 4 This is a top view of the marine aquaculture cage for large yellow croaker described in a specific embodiment;

[0033] Figure 5 This is a flowchart illustrating a specific implementation method for preventing and controlling iridovirus in large yellow croaker.

[0034] The reference numerals used in the above figures are explained as follows:

[0035] 110. Wire mesh cage body,

[0036] 120. Main water inlet pipe,

[0037] 121. Drug addition tube,

[0038] 122. Fresh water is added to the pipe.

[0039] 123. Vent hole,

[0040] 130. Water outlet pipe,

[0041] 131. Water outlet,

[0042] 140. Push the water pump.

[0043] 150. Inlet branch pipe,

[0044] 151. Intake manifold

[0045] 152. Touyao.com Detailed Implementation

[0046] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0047] The term "embodiment" is mentioned herein means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0048] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the art to which the present application belongs; the use of related terms herein is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0049] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " herein generally represents that the associated objects before and after are a "or" logical relationship.

[0050] In the present application, the terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0051] In the present application, without more limitation, the "includes", "contains", "has" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include the elements inherent to such process, method or product.

[0052] As the same as the understanding in the "Guidelines for Examination", in the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times", etc., unless otherwise explicitly limited.

[0053] In the description of the embodiments of the present application, the spatial relative expressions used, such as "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship shown in the specific embodiments or the drawings, and are only used to facilitate the description of the specific embodiments of the present application or to facilitate the understanding of the reader, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0054] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", and the like should be understood broadly. For example, the "connection" can be fixed connection, or detachable connection, or integral setting; it can be mechanical connection, or electrical connection, or communication connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] Please refer to Figure 1 The present embodiment provides a large yellow croaker offshore aquaculture net cage, comprising:

[0056] The net cage body 110 is provided with an aquaculture area inside, and the aquaculture area is used for aquaculture of large yellow croaker;

[0057] The water inlet main pipe 120 has one end extending out of the aquaculture area of the net cage body 110, and the end of the water inlet main pipe 120 extending out of the aquaculture area is provided with a medicine adding pipe 121 and a fresh water adding pipe 122;

[0058] The water outlet pipe 130 is arranged in the aquaculture area of the net cage body 110, and the bottom of the water outlet pipe 130 is provided with a water outlet hole 131;

[0059] The water pushing pump 140 is arranged between the water inlet main pipe 120 and the water outlet pipe 130, and the water pushing pump 140 is used for sending the water in the water inlet main pipe 120 into the water outlet pipe 130;

[0060] The water inlet branch pipe 150 is connected to one end of the water inlet main pipe 120, and the other end of the water inlet branch pipe 150 is provided with an air inlet small pipe 151 and a water inlet. The air inlet small pipe 151 extends out of the culture area of the net cage body 110, and the water inlet is used to suck the water on the water surface.

[0061] When large yellow croakers are cultured, the net cage body 110 is placed in the sea, so that the culture area of the net cage body 110 is covered with seawater, and the large yellow croakers are cultured in the culture area. One end of the water inlet main pipe 120 extends out of the culture area and the sea level, so that the culture personnel can add drugs or fresh water through the drug adding pipe 121 or the fresh water adding pipe 122 on the water inlet main pipe 120, and at the same time, the water inlet main pipe 120 is connected to the water inlet branch pipe 150, and the air inlet small pipe 151 on the water inlet main pipe 120 is used to oxygenate the water in the deep part of the culture area. When the water in the culture area is oxygenated during the slack tide period, the water pump 140 is operated, the water on the water surface is sucked into the water inlet main pipe 120 through the water inlet on the water inlet main pipe 120, and at the same time, the air inlet small pipe 151 on the water inlet branch pipe 150 sucks in air, the micro-bubbles are sucked into the water in the air inlet branch pipe, and the dissolved oxygen in the water in the air inlet branch pipe is increased. During the operation of the water pump 140, the water on the water surface is sucked into the air inlet pipe, and then is sent into the water outlet pipe 130, and then is sent into the bottom of the culture area through the water outlet of the water outlet pipe 130, so as to oxygenate the water in the culture area during the slack tide period, and to alleviate the problem of low dissolved oxygen during the slack tide period. When it is necessary to prevent and treat the bennidiella disease, the fresh water adding pipe 122 on the water inlet main pipe 120 is connected to a fresh water source, and the water inlet branch pipe 150 is closed, the fresh water in the fresh water source is sucked into the water outlet pipe 130 through the water pump 140, and is discharged from the water outlet of the water outlet pipe 130, so as to form a low salinity area in the culture area for a short time, so that the bennidiella is stimulated to fall off under the stimulation of fresh water, and the disease is alleviated. When it is necessary to prevent and treat the cryptobia disease, the drug adding pipe 121 is connected to a drug bucket for adding artemisinin and the like, according to the volume of the net cage, the concentration of the drug in the drug bucket and the flow of the water pump 140, the drug and the water on the water surface are mixed, and then are sent into the deep part of the culture area through the water pump 140 during the slack tide period, so as to maintain a high concentration of medicated bath in the culture area for a short time, so that the cryptobia is stimulated to fall off, and the disease is alleviated.

[0062] Please refer to Figures 1-2 and Figure 4 In some embodiments, the water inlet branch pipe 150 is a plurality of water inlet branch pipes. A plurality of water inlet branch pipes 150 can be arranged around the water inlet main pipe 120 and connected to the water inlet main pipe 120, and each water inlet main pipe 120 is provided with a water inlet and an air inlet small pipe 151. The water in the deep part of the culture area can be oxygenated through the air inlet small pipes 151 and the water inlets of the plurality of water inlet branch pipes 150. According to the oxygenation requirement, different numbers of water inlet branch pipes 150 can be connected to the water inlet main pipe 120.

[0063] Referring to Figures 2-4 In some embodiments, the water inlet of the water inlet branch pipe 150 is provided with a medicine adding net 152. By providing the water inlet of the water inlet branch pipe 150 with the medicine adding net 152, corresponding medicine or auxiliary items can be placed in the medicine adding net 152 when needed, for example, solid oxygen-increasing particles can be added to the medicine adding net 152 of the water inlet of the water inlet branch pipe 150 when the dissolved oxygen in the sea area is extremely low, so as to increase the oxygen-increasing efficiency.

[0064] In some embodiments, a valve is arranged on the water inlet branch pipe 150. By arranging the valve on the pipeline of the water inlet branch pipe 150, the opening and closing of the water inlet branch pipe 150 can be controlled, for example, when fresh water needs to be added to the deep part of the culture area, the water inlet branch pipe 150 can be closed by controlling the valve; when oxygen needs to be increased in the deep part of the culture area, the water inlet branch pipe 150 can be opened by controlling the valve. In other embodiments, two water inlet spaces can be arranged inside the water inlet main pipe 120, both of which are connected to the water pushing pump 140, one of which is connected to the fresh water inlet pipe, and the other of which is connected to the medicine adding pipe 121 and the water inlet branch pipe 150. By controlling the opening and closing of the water inlet space connected to the water inlet branch pipe 150 and the water pushing pump 140, different functions can be realized.

[0065] In some embodiments, a gas releasing hole 123 is arranged on the water inlet main pipe. By arranging the gas releasing hole 123 on the gas inlet pipe, the gas releasing hole 123 is higher than the horizontal plane. When oxygen needs to be increased in the deep part of the culture area, micro-bubbles are sucked into the water through the gas inlet pipe 151 to increase the dissolved oxygen in the water. When the water in the water inlet main pipe 120 enters the deep part of the net cage, the bubbles can overflow through the gas releasing hole 123.

[0066] By providing a large yellow croaker offshore culture net cage, the bennidium disease prevention and treatment, the cryptosporidium disease prevention and treatment, and the oxygen-increasing effect in the deep part of the culture area can be achieved. Specifically, by connecting the water inlet main pipe 120 to the water pushing pump 140 through multiple water inlet branch pipes 150 to form a distributed water pushing pump 140, the surface water with high dissolved oxygen on the sea surface is further oxygenated and injected into the center of the net cage. During the slack tide period, the dissolved oxygen in the net cage can be increased with low energy consumption, the feed utilization rate can be improved, the stress caused by hypoxia can be reduced, and the disease can be reduced. At the same time, by adjusting the water inlet mode of the water pump, the medicine that can only be used for spraying can be effectively delivered to the center of the net cage where the fish are distributed.

[0067] First, the bennidium disease prevention and treatment;

[0068] The bennidium is a kind of body surface parasite disease frequently occurred in summer of large yellow croaker, and the parasite has obvious reaction to fresh water, and will fall off quickly under the stimulation of fresh water.In the sea cage culture, the bennidium is often helpless.The water pushing pump 140 is adopted, in the period when the bennidium is more frequent, in the slack tide period, the water inlet space on the water pushing pump 140 is connected with the fresh water pipe, the other water inlet branch pipes 150 are closed, fresh water is injected into the deep part of the cage through the ship, and a low salinity area is formed for a short time.Because the large yellow croaker is a wide-salinity variety, and has high tolerance to low salinity, and will not be affected by fresh water, while the bennidium will fall off in large quantities under the stimulation of fresh water, and the disease is relieved.

[0069] Secondly, stimulating cryptosporidium disease prevention and treatment;

[0070] The medicine inlet pipe of the water inlet space is connected with the medicine application barrel.The volume of the cage, the concentration of the medicine and the flow of the water pushing pump 140 are calculated, the medicine such as artemisinin is added in the medicine application barrel, in the slack tide period, the water pushing pump 140 is used to inject appropriate sea water into the cage, so that the high-concentration medicine bath state in the cage can be maintained for a short time, the cryptosporidium is caused to fall off, and the disease is relieved.

[0071] Thirdly, oxygenation in the deep part of the culture area;

[0072] When the water pushing pump 140 works, the water in the dispersedly arranged water inlet branch pipes 150 is sucked into the water inlet main pipe 120 and pushed to the deep part of the culture cage.The air inlet small pipes 151 on the water inlet branch pipes 150 can suck the micro-bubbles into the water, and further increase the dissolved oxygen in the water.The water in the water inlet branch pipes 150 enters the deep part of the cage, and the bubbles overflow from the air outlet small holes 123.Because the water on the water surface of the culture cage has high dissolved oxygen, and the distributed pipeline further increases the dissolved oxygen, the dissolved oxygen of the sea water entering the deep part of the cage is high, and the problem that the dissolved oxygen is low in the slack tide period of the cage is solved.

[0073] Please refer to Figure 5 A large yellow croaker iridovirus prevention and treatment method, the method applies the large yellow croaker sea culture cage in the above embodiment, and comprises the following steps:

[0074] Step S510: adding a first preset proportion of radix notoginseng extract in the feed of the large yellow croaker in the culture area in the first preset days in the feeding period;

[0075] Step S520: adding a second preset proportion of florfenicol in the feed of the large yellow croaker in the culture area in the second preset days, and starting the water pushing pump to increase the oxygen in the water body in the culture area in the low tide period;

[0076] Step S530: pausing the feed of the large yellow croaker in the culture area for a third preset number of days;

[0077] Step S540: adding a third preset proportion of doxycycline in the feed of the large yellow croaker in the breeding area within a fourth preset number of days, and starting the water pushing pump to oxygenate the water in the breeding area during the low tide period;

[0078] Step S550: suspending the feed of the large yellow croaker in the breeding area for a fifth preset number of days.

[0079] The large yellow croaker iridovirus is more prevalent during the high temperature period, and there is currently no effective drug for prevention and treatment. During the high temperature period, the sea area dissolved oxygen is also at its lowest, which often increases the loss of the large yellow croaker iridovirus. The method uses an immune enhancer combined with oxygenation mode to effectively reduce the prevention and treatment of the large yellow croaker iridovirus disease in summer. Specifically, when preventing and treating the large yellow croaker iridovirus in the large yellow croaker in the offshore net cage in the above-mentioned embodiment, a first preset proportion of radix pseudoginseng extract is added to the feed of the large yellow croaker in the breeding area within a first preset number of days during the feeding period, the radix pseudoginseng extract is used to improve the spleen and stomach of the large yellow croaker, and the immune capacity of the large yellow croaker is enhanced, then a preset proportion of florfenicol is added to the feed of the large yellow croaker in the breeding area within a second preset number of days to prevent bacterial complications accompanied by iridovirus infection, then the feed is stopped for a third preset number of days, then a third preset proportion of doxycycline is added to the feed within a fourth preset number of days for anti-inflammatory treatment, then the feed is stopped for a fifth preset number of days, and then the next feeding cycle is entered. The number of days of the feeding cycle is the total number of days of the first preset number of days, the second preset number of days, the third preset number of days, the fourth preset number of days, and the fifth preset number of days, and during the treatment of the large yellow croaker iridovirus by the drug, the distributed water pushing pump of the large yellow croaker offshore net cage in the above-mentioned embodiment is used to oxygenate the water in the breeding area, and the dissolved oxygen is maintained above 4 mg / kg. In extreme cases where the sea area dissolved oxygen is particularly low, solid oxygenation particles can be added to the water inlet of the water inlet branch pipe to improve the oxygenation efficiency of the distributed water pushing pump.

[0080] In some embodiments, the first preset number of days is three days, and the second preset number of days, the third preset number of days, the fourth preset number of days, and the fifth preset number of days are all one day. In other embodiments, the number of days of the first preset number of days, the second preset number of days, the third preset number of days, the fourth preset number of days, and the fifth preset number of days can be adjusted according to the infection of the iridovirus,

[0081] In some embodiments, the first preset proportion is 2.5-3.5 g / kg. Preferably, the first preset proportion is 3 g / kg, that is, the proportion of radix pseudoginseng extract to feed is 3 g: 1 kg; and the first preset proportion can be adjusted according to the infection of the iridovirus.

[0082] In some embodiments, the second preset ratio is 0.8-1.2 g / kg. Preferably, the second preset ratio is 1 g / kg, i.e. the ratio of florfenicol to feed is 1 g: 1 kg, and the second preset ratio can be adjusted according to the infection of iridovirus.

[0083] In some embodiments, the third preset ratio is 0.8-1.2 g / kg. The third preset ratio is 1 g / kg, i.e. the ratio of doxycycline to feed is 1 g: 1 kg, and the third preset ratio can be adjusted according to the infection of iridovirus.

[0084] In some embodiments, a method for preventing and treating iridovirus of large yellow croaker is provided, and the method is as follows: in the summer high temperature season, 3 kg of radix notoginseng extract is added to the feed of large yellow croaker, 3 days a week, then 1 g / kg of florfenicol is added one day, the feed is stopped for one day, then 1 g / kg of doxycycline is added, and the feed is stopped for one day. This is a 7-day cycle. During the process of adding drugs, distributed water pumps are used to increase oxygen in the net cage during the low tide period every day, so as to maintain the dissolved oxygen above 4 mg / kg. In the extreme case of extremely low dissolved oxygen in the sea area, solid oxygen-increasing particles can be added to the water inlet of the distributed water pump to improve the oxygen-increasing efficiency of the distributed water pump.

[0085] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of the present application, they do not limit the patent protection scope of the present application. Any equivalent structure or equivalent flow replacement or modification based on the essential concept of the present application, using the content described in the specification and drawings, directly or indirectly, and the technical solutions of the above embodiments applied to other related technical fields, etc., are all included in the patent protection scope of the present application.

Claims

1. A large yellow croaker offshore farming net cage, characterized in that, The application relates to a large yellow croaker offshore culture net cage. The net cage comprises a net cage body, a water inlet main pipe, a water outlet pipe, a water pushing pump, and a water inlet branch pipe. The water inlet main pipe is arranged outside the culture area of the net cage body, and a medicine adding pipe and a fresh water adding pipe are arranged on the end of the water inlet main pipe outside the culture area. The water outlet pipe is arranged in the culture area of the net cage body, and a water outlet hole is arranged at the bottom of the water outlet pipe. The water pushing pump is arranged between the water inlet main pipe and the water outlet pipe, and is used for sending water in the water inlet main pipe into the water outlet pipe. The water inlet branch pipe is connected to the water inlet main pipe at one end, and is provided with an air inlet small pipe and a water inlet at the other end.

2. The cage according to claim 1, wherein, The air inlet small pipe is arranged outside the culture area of the net cage body.

3. The cage according to claim 1, wherein, The water inlet is used for sucking water on the water surface.

4. The cage according to claim 1, wherein, The water inlet branch pipe is provided with a plurality of medicine adding nets.

5. The cage according to claim 1, wherein, The water inlet branch pipe is provided with a valve.

6. A method for preventing and treating rainbow trout iridovirus, characterized in that, The water inlet main pipe is provided with a gas releasing small hole. The method uses the large yellow croaker offshore culture net cage according to any one of claims 1-5. During the feeding period, a first preset proportion of radix notoginseng extract is added into the feed of the large yellow croaker in the culture area for a first preset number of days. During a second preset number of days, a second preset proportion of florfenicol is added into the feed of the large yellow croaker in the culture area, and the water pushing pump is started to increase the oxygen content of the water in the culture area during the low tide period. The feed of the large yellow croaker in the culture area is suspended for a third preset number of days. During a fourth preset number of days, a third preset proportion of doxycycline is added into the feed of the large yellow croaker in the culture area, and the water pushing pump is started to increase the oxygen content of the water in the culture area during the low tide period.

7. The method for preventing and treating the PVM of Pseudosciaena crocea according to claim 6, characterized in that, The feed of the large yellow croaker in the culture area is suspended for a fifth preset number of days.

8. The method for preventing and treating the PVM of Pseudosciaena crocea according to claim 6, characterized in that, The first preset number of days is three days, and the second, third, fourth and fifth preset numbers of days are all one day.

9. The method for preventing and treating the PVM of Pseudosciaena crocea according to claim 6, characterized in that, The first preset proportion is 2.5-3.5 g / kg.

10. The method for preventing and treating the PVM of Pseudosciaena crocea according to claim 6, characterized in that, The second preset proportion is 0.8-1.2 g / kg. The third preset proportion is 0.8-1.2 g / kg.

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