Method for blending aquaculture water quality for aquaculture of marine fishes by using brackish water

Abstract

The invention relates to the technical field of brackish water transformation and application, and discloses a method for blending aquaculture water quality for aquaculture of marine fishes by using brackish water. According to the characteristics of the brackish water, the brackish water is subjected to water quality blending and nutrient solution blending, the nutrient solution is formed by blending the brackish water and nutrient substances, circulation and addition of the nutrient solution are systematically controlled, the one-time water changing amount of a culture pond and the overall influence on the water temperature after water changing are considered, and a good environment is provided for growth of marine fishes. And the stress reaction caused by water quality fluctuation is reduced. The compound Chinese herbal medicines added according to the characteristics of the brackish water and the basic feed for the marine fishes can meet the growth requirements of the marine fishes under specific conditions, so that the survival rate and nutritional ingredients of the marine fishes are improved. Further, a brackish water circulation culture mode mainly based on a brackish water quality improvement regulation and control technology is constructed, and technical support is provided for green, ecological and efficient utilization of medium-alkalinity ponds and popularization and culture of salmon and trout and other marine fishes in brackish water areas in Ningxia.

Description

Technical Field

[0001] The present application relates to the technical field of brackish water transformation and application, and in particular to a method for adjusting the water quality for breeding marine fish by using brackish water. Background Art

[0002] China is a country with abundant water resources. The total amount of water resources is large, but the per capita and per mu average values ​​are small, and the regional distribution is uneven. At present, China is still one of the countries with water shortage in the world. In recent years, due to environmental pollution, severe climate change, the decline of river and lake water levels, and the increase of mineralization, the land and freshwater resources used for aquaculture have been restricted. The Ningxia region in my country is characterized by a large amount of saline-alkali land and abundant brackish water resources.

[0003] According to foreign data, the United States, Israel, India, Australia and other countries have begun to use underground brackish water for commercial production. However, at present, the development and utilization rate of brackish water in my country is not high. In recent years, some countries have explored the application of brackish water in marine fish farming. For example, Israel has found that the brackish geothermal water in deep aquifers can be used to farm fish. However, due to the characteristics of brackish water with diverse water chemistry and poor water quality buffering capacity, although the water quality of brackish water can be improved by technical means at this stage, the water quality of brackish water is special. After brackish water is used as marine fish farming water, its supporting nutrients and corresponding allocation methods are still in the initial stage. According to the characteristics of brackish water, brackish water and nutrients have not been systematically allocated, which makes it difficult for most aquatic organisms to adapt. More importantly, the output of aquaculture is unstable, which affects and restricts the application of brackish water in marine fish farming. Summary of the invention

[0004] In view of the above problems, an embodiment of the present application provides a method for preparing aquaculture water quality for marine fish using brackish water. A nutrient solution can be formed by preparing brackish water and nutrients according to the characteristics of brackish water, and the circulation and addition of the nutrient solution can be systematically controlled, thereby improving the survival rate of marine fish and enhancing their nutritional content.

[0005] According to one aspect of the embodiment of the present application, a method for preparing aquaculture water quality for aquaculture of marine fish using brackish water is provided. The method for preparing aquaculture water quality for aquaculture of marine fish using brackish water includes water quality preparation and nutrient solution preparation; the water quality preparation includes the following steps:

[0006] S1, conveying the brackish water to a physical filtration component for filtration to remove suspended matter and solid particles in the brackish water, and then taking out the clear liquid to form primary clean brackish water;

[0007] S2, transporting the primary clean brackish water to a biological filtration assembly for biological filtration to remove harmful substances such as ammonia nitrogen and nitrite in the primary clean brackish water, and then extracting the primary clean brackish water to form secondary clean brackish water;

[0008] S3, transporting the secondary clean brackish water to a sterilization and disinfection system for sterilization and disinfection to kill harmful microorganisms such as bacteria and viruses in the secondary clean brackish water to form tertiary clean brackish water;

[0009] S4, sending the tertiary clean brackish water into an oxygenation system for oxygenation, so that the oxygen concentration in the tertiary clean brackish water is ≥7.0 mg / mL to form a candidate nutrient solution;

[0010] The nutrient solution preparation comprises the following steps:

[0011] S5, exporting the alternative nutrient solution to a primary regulating tank and adjusting the temperature in the primary regulating tank to 11-14° C. for temporary storage, detecting the main ion concentration of the alternative nutrient solution in the primary regulating tank and forming a primary nutrient solution by adding elements such as Ca2+, Mg2+, K+, and Na+, and then replenishing the alternative nutrient solution to the primary regulating tank daily, wherein the alternative nutrient solution replenished daily is less than 10% of the total amount of the primary nutrient solution in the primary regulating tank;

[0012] S6, according to the amount of circulating water in the breeding pond, the first-level nutrient solution in the first-level regulating tank is discharged to the second-level regulating tank, and the compound Chinese herbal medicine and marine fish basic feed are added to the second-level regulating tank to form a second-level nutrient solution, and the second-level nutrient solution is introduced into the breeding pond.

[0013] In some embodiments, the main ion concentration of the alternative nutrient solution in the first-level regulating tank is detected and the contents of each element that need to be controlled in the first-level nutrient solution are formed by adding elements such as Ca2+, Mg2+, K+, Na+, etc.: Ca2+ 0.18 mg / L, Ca2Mg2+ 0.42 mg / L, Ca2K+ 0.15 mg / L, Ca2Na+ 6.46 mg / L and the Mg2++Ca2+ / Na++K+ ratio is 0.10-0.12.

[0014] In some embodiments, the compound Chinese herbal medicine is added to the secondary regulating tank, and the compound Chinese herbal medicine includes red dates, yam and astragalus.

[0015] In some embodiments, the ratio of jujube, yam and astragalus in the compound Chinese herbal medicine is 20:20:1.

[0016] In some embodiments, the basic feed for marine fish includes crude protein, lysine, crude fiber, crude ash and crude fat, the crude protein component is ≥52.0%, the lysine component is ≥2.8%, the crude fiber component is ≤5.0%, the crude ash component is ≤14.0%, and the crude fat component is ≥8.0%.

[0017] In some embodiments, the total weight of the compound Chinese herbal medicine is 0.5%-0.6% of the total weight of the basic feed for marine fish.

[0018] In some embodiments, the total weight of the marine fish basic feed is 5%-6% of the total weight of the marine fish cultured in the culture pond.

[0019] In some embodiments, according to the amount of circulating water in the culture pond in S6, the amount of circulating water is 2%-4% of the total amount of water in the culture pond.

[0020] In some embodiments, the brackish water described in S1 is transported to a physical filtration component for filtration, wherein the physical filtration may be performed by sedimentation, sand filtration, or filtration using a microfiltration machine.

[0021] In some embodiments, the first-level clean brackish water described in S2 is transported to a biological filtration component for biological filtration, wherein the biological filtration component includes a moving bed bioreactor, a trickling filter and a biological rotary disc.

[0022] The beneficial effects in this application are:

[0023] In the present application, the water quality and nutrient solution of brackish water are prepared according to the characteristics of brackish water. The nutrient solution is formed by preparing brackish water and nutrients, and the circulation and addition of the nutrient solution are systematically controlled, taking into account the amount of water changed in the breeding pond at one time and the overall impact on the water temperature after the water change, thereby improving the survival rate of marine fish and enhancing their nutritional content.

[0024] In the present application, a secondary nutrient solution is formed by configuring a compound Chinese herbal medicine and adding it to a basic feed for marine fish. The compound Chinese herbal medicine includes jujube, yam and astragalus. After the primary nutrient solution whose temperature is controlled in the primary regulating tank enters the secondary regulating tank, this part of the compound Chinese herbal medicine and the basic feed for marine fish will be fully mixed with the primary nutrient solution. Under the conditions of bitter and salty water, it can promote the growth and development of the spleen of marine fish such as salmon and trout, increase the serum TP, C3, C4 and TNF-a levels and SOD.LZM and ACP activities, improve the immune function of marine fish such as salmon and trout, improve the survival rate and improve their nutritional value.

[0025] In the present application, the components of the basic feed are added and applied based on a specific brackish water environment. According to the various elements contained in the brackish water itself and the pH conditions of the brackish water after preparation, the nutrients of this component can fully meet the growth needs of marine fish, and there is less nutrient redundancy.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the overall process of the method for preparing water quality for aquaculture of marine fish using brackish water provided in an embodiment of the present application; DETAILED DESCRIPTION

[0029] The following will describe in detail the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and cannot be used to limit the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned description of the drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0030] Specifically, please refer to Figure 1 , Figure 1 The overall process diagram of the method for preparing aquaculture water quality for aquaculture of marine fish using brackish water provided in the embodiment of the present application. The method for preparing aquaculture water quality for aquaculture of marine fish using brackish water includes water quality preparation and nutrient solution preparation; the water quality preparation includes the following steps:

[0031] S1, the brackish water is conveyed to the physical filtration component for filtration to remove suspended matter and solid particles in the brackish water, and then the clear liquid is taken to form the first-level clean brackish water; the specific method of physical filtration can be sedimentation, sand filtration and filtration using a microfiltration machine. When the nutrient solution in the breeding pond is circulated, the nutrient solution can also be conveyed to the physical filtration component for physical filtration together with the brackish water originally in the physical filtration component to remove large particle pollutants such as fish feces and leftover bait in the nutrient solution.

[0032] S2, transporting the primary clean brackish water to the biological filtration component for biological filtration to remove harmful substances such as ammonia nitrogen and nitrite in the primary clean brackish water, and then draining the primary clean brackish water to form secondary clean brackish water; the biological filtration system mainly includes a moving bed bioreactor, a trickling filter, a biological rotary disc, etc., which can remove harmful substances such as ammonia nitrogen and nitrite in the water through biological action, and further purify the water quality.

[0033] S3, transporting the secondary clean brackish water to a sterilization and disinfection system for sterilization and disinfection to kill harmful microorganisms such as bacteria and viruses in the secondary clean brackish water to form tertiary clean brackish water; the sterilization and disinfection system uses ultraviolet rays to kill harmful microorganisms such as bacteria and viruses in the water.

[0034] S4, sending the tertiary clean brackish water into an aeration system for oxygenation, so that the oxygen concentration in the tertiary clean brackish water is ≥7.0 mg / mL to form an alternative nutrient solution; specifically, the aeration system uses pure oxygen aeration, low-pressure oxygen mixer and other equipment to add oxygen to the tertiary clean brackish water or increase the contact area between the tertiary clean brackish water and the air through aeration, thereby improving the tertiary clean brackish water, maintaining sufficient dissolved oxygen in the water body to make adequate preparations for the subsequent formation of nutrient solution for marine fish farming.

[0035] The nutrient solution preparation comprises the following steps:

[0036] S5, exporting the alternative nutrient solution to the primary regulating tank and adjusting the temperature in the primary regulating tank to 11-14°C for temporary storage, detecting the main ion concentration of the alternative nutrient solution in the primary regulating tank and forming a primary nutrient solution by adding elements such as Ca2+, Mg2+, K+, and Na+, and then replenishing the alternative nutrient solution to the primary regulating tank daily, wherein the daily replenished alternative nutrient solution is less than 10% of the total amount of the primary nutrient solution in the primary regulating tank; it should be noted that the concentration of ions such as Ca2+, Mg2+, K+, and Na+ in the primary regulating tank should be monitored in time and replenished in time. Specifically, the content of each element to be controlled is: controlling Ca2+ at 0.18 mg / L, Ca2Mg2+ at 0.42 mg / L, Ca2K+ at 0.15 mg / L, Ca2Na+ at 6.46 mg / L, and the ratio of Mg2++Ca2+ / Na++K+ at 0.10-0.12. Thus, marine fish such as salmon and trout can better adapt to the brackish water environment. The first-level regulating tank is used to temporarily store the first-level nutrient solution, which is then added to the fish pond after reprocessing according to the daily water circulation volume of the fish pond. The same amount of waste nutrient solution discharged from the fish pond enters the physical filtration component in S1 above for physical filtration again. During the circulation process, it is necessary to ensure that the water level area in the fish pond is stable and does not change significantly. It should be specifically stated that the specific number of first-level regulating tanks can be multiple or single. According to different actual conditions, the water capacity of the fish pond should be 4-5 times the total water capacity of all first-level regulating tanks to meet the reserve of circulating water in the fish pond. Temperature control equipment and temperature measuring equipment can be set on the first-level regulating tank to keep the water temperature in the first-level regulating tank at 11-14°C at all times. This temperature is convenient for the continuous preservation of the first-level nutrient solution, and when the first-level nutrient solution is subsequently processed and sent to the fish farming pond, the temperature is close to the temperature of the fish farming pond. In addition, the daily circulating water volume of the fish farming pond is also controlled in this application. Therefore, when the water temperature in the first-level regulating tank is constant and the ratio of the water storage volume in the fish farming pond to the supplementary volume of the second-level nutrient solution is constant, the addition of the second-level nutrient solution to the fish farming pond will not have a significant impact on the temperature in the fish farming pond, which is within the acceptable range for marine fish.

[0037] S6, according to the amount of circulating water in the breeding pond, the first-level nutrient solution in the first-level regulating tank is led out to the second-level regulating tank, and compound Chinese herbal medicine and basic feed for marine fish are added to the second-level regulating tank to form a second-level nutrient solution, and the second-level nutrient solution is introduced into the breeding pond. Specifically, the compound Chinese herbal medicine and basic feed for marine fish should be added in a certain proportion, and the overall proportion of the compound Chinese herbal medicine is 0.5%-0.6% of the total weight of the basic feed for marine fish. It should be noted that the second-level regulating tank does not play a role in long-term storage of the second-level nutrient solution. After the first-level nutrient solution is sent to the second-level regulating tank, the compound Chinese herbal medicine and basic feed for marine fish need to be added quickly, and the stirring and mixing equipment on the second-level regulating tank needs to be used to quickly mix them evenly to form a second-level nutrient solution. Then the second-level nutrient solution will be completely introduced into the breeding pond, and the second-level regulating tank needs to be cleaned and disinfected after being emptied. It is worth specifying that the compound Chinese herbal medicine includes red dates, yam and astragalus. It is worth further specifying that the ratio of dates, yam and astragalus in the compound Chinese herbal medicine is 20:20:1. According to the nutritional needs of marine fish and the characteristics of the bitter and salty water environment, the nutritional needs of marine fish in the bitter and salty water environment can be met by adjusting the addition amount and addition ratio of the compound Chinese herbal medicine. At the same time, it can significantly improve the growth performance of rainbow trout fingerlings, improve the nonspecific immunity of fish, and has the effects of promoting growth, promoting digestion, improving antioxidant capacity and lowering blood lipids. After the compound Chinese herbal medicine additive is formed and mixed and fed, it can promote the growth and development of the spleen of salmon and trout, increase the serum TP, C3, C4 and TNF-a levels and SOD.LZM and ACP activities, improve the immune function of salmon and trout, and further enhance their adaptability in bitter and salty water. On the other hand, it also needs to be specifically explained that in the brackish water environment, the basic feed for marine fish includes crude protein, lysine, crude fiber, crude ash and crude fat. The crude protein component is ≥52.0%, the lysine component is ≥2.8%, the crude fiber component is ≤5.0%, the crude ash component is ≤14.0%, and the crude fat component is ≥8.0%. The components of this basic feed are added and applied based on the specific brackish water environment. According to the various elements contained in the brackish water itself and the pH conditions of the brackish water after preparation, the nutrients used in this component can fully meet the growth needs of marine fish, and there is less nutrient redundancy.

[0038] In some embodiments, the total weight of the basic feed for marine fish is 5%-6% of the total weight of the cultured marine fish in the culture pond. In the embodiments of the present application, the daily input amount of the basic feed for marine fish is controlled, and under brackish water conditions, the input amount can meet the growth needs of marine fish, especially salmon and trout, and save feed costs under the condition of meeting the growth needs of marine fish.

[0039] In some embodiments, according to the circulating water volume in the breeding pond described in S6, the circulating water volume is 2%-4% of the total water volume in the breeding pond. In the embodiment of the present application, the water volume of each water change, that is, the circulating water volume, is 2%-4% of the total water volume in the breeding pond. This water volume does not include the water volume of the breeding pond consumed due to evaporation and other effects. Of course, due to natural conditions such as evaporation, in order to maintain the stability of the water volume in the breeding pond, the amount of secondary nutrient solution added should be greater than 2%-4% of the total water volume in the breeding pond. Within this range, since the temperature in the primary regulating tank is controlled at 11-14°C, although this temperature can meet the storage of the primary nutrient solution, it is not exactly the same as the water temperature in the breeding pond. In the process of circulating and replacing the water body in the breeding pond, when the circulating water volume is 2%-4% of the total water volume in the breeding pond, it can be ensured that the water temperature change in the breeding pond is within a reasonable and controllable range, and will not cause excessive impact on the living conditions of marine fish.

[0040] After the comprehensive application of this series of technologies, taking salmon and trout as an example, the survival rate of salmon and trout cultured in brackish water reached more than 97.9% and the output reached 1210kg / 667㎡, which can be increased by at least 35kg / 667㎡. The crude protein content of the muscle of farmed salmon and trout was 19.74%, the moisture content was 74.83%, the ratio of essential amino acids to total amino acids was 41.52%, the ratio of essential amino acids to non-essential amino acids was 70.99%, the content of unsaturated fatty acids was 61.66%, the content of eicosapentaenoic acid and docosahexaenoic acid (EPA+DHA) was 5.77%, the total amount of umami amino acids was 194.43mg / kg, the total amount of sweet amino acids was 1214.90mg / kg, and the total free amino acids were 1752.40mg / kg. The nutritional value and sensory characteristics of farmed salmon and trout were better than those of freshwater farmed salmon and trout.

[0041] The secondary nutrient solution is formed by adding compound Chinese herbal medicine and basic feed for marine fish. The compound Chinese herbal medicine includes jujube, yam and astragalus, which has the advantages of promoting growth, no drug residue, enhancing body immunity, wide source and widely grown in northwest my country, and convenient and cheap to obtain. After the primary nutrient solution with temperature control in the primary regulating tank enters the secondary regulating tank, this part of the compound Chinese herbal medicine and the basic feed for marine fish will be fully mixed with the primary nutrient solution. Under the condition of bitter and salty water, it can promote the growth and development of the spleen of marine fish such as salmon and trout, increase the content of serum TP, C3, C4 and TNF-a and the activity of SOD.LZM and ACP, improve the immune function of marine fish such as salmon and trout, improve the survival rate and improve its nutritional value.

[0042] The components of the basic feed in the present application are added and applied based on a specific brackish water environment. According to the various elements contained in the brackish water itself and the pH conditions of the brackish water after preparation, the nutrients of this component can fully meet the growth needs of marine fish, and there is less nutrient redundancy.

[0043] In this application, the brackish water is adjusted according to its characteristics and the nutrient solution is adjusted. The nutrient solution is formed by adjusting the brackish water and nutrients, and the circulation and addition of the nutrient solution are systematically controlled, taking into account the amount of water changed in the breeding pond at one time and the overall impact on the water temperature after the water change, so as to provide a good environment for the growth of marine fish and reduce the stress response caused by water quality fluctuations. The step-by-step control technology pays more attention to the stability of the process. It enables salmon and trout to adapt to the new water quality environment by gradually adjusting the water body and adding nutrients and compound Chinese herbal medicines, reducing the risks caused by water quality mutations, thereby improving the survival rate of marine fish and enhancing their nutritional content.

[0044] This application aims to study some problems existing in the brackish water aquaculture of marine fish, including low dissolved oxygen, high concentrations of toxic and harmful substances such as ammonia nitrogen and nitrite nitrogen, poor plankton resources, changes in water temperature during circulating water exchange, and the complex and changeable water quality of saline-alkali ponds themselves. It conducts research on technologies and models for recycling and comprehensive regulation of brackish water for breeding marine fish such as salmon and trout, and constructs a brackish water recycling aquaculture model based on brackish water quality improvement and regulation technology, to provide technical support for the green, ecological and efficient utilization of medium-alkalinity ponds and the promotion and aquaculture of marine fish such as salmon and trout in brackish waters in Ningxia.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for preparing water quality for breeding marine fish using brackish water, characterized in that: Including water preparation and nutrient solution preparation; The water quality preparation comprises the following steps: S1, conveying the brackish water to a physical filtration component for filtration to remove suspended matter and solid particles in the brackish water, and then taking out the clear liquid to form primary clean brackish water; S2, transporting the primary clean brackish water to a biological filtration assembly for biological filtration to remove harmful substances such as ammonia nitrogen and nitrite in the primary clean brackish water, and then extracting the primary clean brackish water to form secondary clean brackish water; S3, transporting the secondary clean brackish water to a sterilization and disinfection system for sterilization and disinfection to kill harmful microorganisms such as bacteria and viruses in the secondary clean brackish water to form tertiary clean brackish water; S4, sending the tertiary clean brackish water into an oxygenation system for oxygenation, so that the oxygen concentration in the tertiary clean brackish water is ≥7.0 mg / mL to form a candidate nutrient solution; The nutrient solution preparation comprises the following steps: S5, exporting the alternative nutrient solution to a primary regulating tank and adjusting the temperature in the primary regulating tank to 11-14° C. for temporary storage, detecting the main ion concentration of the alternative nutrient solution in the primary regulating tank and forming a primary nutrient solution by adding elements such as Ca2+, Mg2+, K+, and Na+, and then replenishing the alternative nutrient solution to the primary regulating tank daily, wherein the alternative nutrient solution replenished daily is less than 10% of the total amount of the primary nutrient solution in the primary regulating tank; S6, according to the amount of circulating water in the breeding pond, the first-level nutrient solution in the first-level regulating tank is discharged to the second-level regulating tank, and the compound Chinese herbal medicine and marine fish basic feed are added to the second-level regulating tank to form a second-level nutrient solution, and the second-level nutrient solution is introduced into the breeding pond.

2. The method for preparing aquaculture water quality for aquaculture of marine fish using brackish water according to claim 1, characterized in that: The main ion concentration of the alternative nutrient solution in the first-level regulating tank is detected and the contents of each element that need to be controlled in the first-level nutrient solution are formed by adding elements such as Ca2+, Mg2+, K+, Na+, etc.: controlling Ca2+ 0.18 mg / L, Ca2Mg2+ 0.42 mg / L, Ca2K+ 0.15 mg / L, Ca2Na+ 6.46 mg / L and the Mg2++Ca2+ / Na++K+ ratio of 0.10-0.

12.

3. The method for preparing water quality for breeding marine fish by using brackish water according to claim 1, characterized in that: The compound Chinese herbal medicine is added into the secondary regulating tank, and the compound Chinese herbal medicine includes red dates, yam and astragalus.

4. The method for preparing aquaculture water quality for aquaculture of marine fish using brackish water according to claim 3, characterized in that: The ratio of jujube, yam and astragalus in the compound Chinese herbal medicine is 20:20:

1.

5. The method for preparing water quality for breeding marine fish by using brackish water according to claim 4, characterized in that: The basic feed for marine fish comprises crude protein, lysine, crude fiber, crude ash and crude fat, wherein the crude protein component is ≥52.0%, the lysine component is ≥2.8%, the crude fiber component is ≤5.0%, the crude ash component is ≤14.0%, and the crude fat component is ≥8.0%.

6. The method for preparing water quality for breeding marine fish by using brackish water according to claim 5, characterized in that: The total weight of the compound Chinese herbal medicine is 0.5%-0.6% of the total weight of the basic feed for marine fish.

7. A method for preparing water quality for breeding marine fish using brackish water according to claim 6, characterized in that: The total weight of the basic feed for marine fish is 5%-6% of the total weight of the marine fish cultured in the culture pond.

8. The method for preparing water quality for breeding marine fish by using brackish water according to claim 1, characterized in that: According to S6, the amount of circulating water in the aquaculture pond is 2%-4% of the total amount of water in the aquaculture pond.

9. The method for preparing water quality for breeding marine fish by using brackish water according to claim 1, characterized in that: As described in S1, the brackish water is transported to a physical filtration component for filtration, wherein the specific physical filtration method may be sedimentation, sand filtration, and filtration using a microfiltration machine.

10. The method for preparing water quality for breeding marine fish by using brackish water according to claim 1, characterized in that: In S2, the primary clean brackish water is transported to a biological filtration component for biological filtration, wherein the biological filtration component includes a moving bed bioreactor, a trickling filter and a biological rotary disc.

Images