Ecological breeding method of clownfish fry

Abstract

The application discloses an ecological cultivation method of clownfish fry, which comprises the following steps: S1, constructing an ecological cultivation tank: a circulation system cultivation tank comprising a main tank and a bottom tank is arranged, the bottom tank comprises a lower water compartment, an algae tank compartment and an upper water compartment which are sequentially communicated, and the lower water compartment and the upper water compartment are communicated with the main tank to form a circulation; S2, cleaning and disinfecting the cultivation tank, and then injecting clean seawater into the cultivation tank; S3, water treatment: culturing nitrifying bacteria in the main tank to construct a perfect circulating water ecological system; S4, feeding fish and algae: feeding clownfish fry into the main tank and feeding large algae into the algae tank compartment; S5, daily management: feeding special feed for clownfish fry into the main tank at regular time, regularly illuminating the cultivation tank, and regularly detecting water quality and water replacement of the cultivation tank; and S6, harvesting: when the clownfish grows to 3-5 cm of a commercial specification, the cultivation is ended, and the clownfish and the large algae are harvested.

Description

Technical Field

[0001] This invention relates to the field of tropical ornamental fish farming technology, specifically to an ecological cultivation method for clownfish fry. Background Technology

[0002] Clownfish, also known as anemonefish, belong to the subfamily Anemonemininae of the family Pomacentridae. They are divided into the genera *Diomyxodon* and *Diomyxodon*, and there are a total of 30 species. They are adorable little elves of the coral reefs, with beautiful colors, gentle temperament, robust and lively nature, and easy to keep.

[0003] Clownfish are small reef fish that grow slowly and have a large appetite. Traditional clownfish farming involves indoor recirculating aquariums. This is achieved through frequent water changes, regular purging and disease control of the environment, and reduced feeding to maintain the clownfish's health and prevent disease. However, this method takes three to four months to raise clownfish fry to a marketable size of 3-5cm. This long farming cycle not only wastes a significant amount of water but also requires frequent monitoring and testing of water quality, resulting in high labor costs. Summary of the Invention

[0004] To address the aforementioned deficiencies in the existing technology, the present invention aims to provide an ecological cultivation method for clownfish fry, which features a short cultivation cycle, low water consumption, low cost, and environmental friendliness. Given the shrinking nearshore aquaculture area and increasingly serious aquaculture pollution, the ecological cultivation method for clownfish fry of the present invention has significant ecological and social benefits.

[0005] The technical solution provided according to the purpose of this invention is as follows:

[0006] An ecological breeding method for clownfish fry includes the following steps:

[0007] S1. Construct an ecological aquaculture tank: Set up a circulating aquaculture tank including a main tank and a bottom tank. The bottom tank includes a water outlet, an algae tank, and a water inlet connected in sequence. The water outlet and the water inlet are connected to the main tank to form a circulation.

[0008] S2. Clean and disinfect the aquaculture tank, and then fill the tank with clean seawater.

[0009] S3, Water Conditioning: Cultivate nitrifying bacteria in the main tank to build a complete recirculating aquatic ecosystem;

[0010] S4. Add fish and algae: Add clownfish fry to the main tank and large algae to the algae tank compartment;

[0011] S5. Daily Management: Regularly feed the main tank with clownfish fry feed, regularly illuminate the tank, and regularly test and change the water quality in the tank.

[0012] S6. Harvesting: Once the clownfish have grown to the marketable size of 3-5cm, the breeding is over, and the clownfish and large algae are harvested.

[0013] Furthermore, in step S1, both the main tank and the bottom tank are rectangular cylinders. The main tank is located above the bottom tank. The bottom tank is mainly used for water purification. The bottom tank is divided into a lower water compartment, an algae compartment, and an upper water compartment along its length by a glass plate. The water levels of the lower water compartment, the algae compartment, and the upper water compartment decrease sequentially so that seawater can flow from the lower water compartment through the algae compartment and the upper water compartment in sequence.

[0014] Furthermore, in step S1, an 8-10cm thick layer of coral sand is laid at the bottom of the main tank for the attachment and reproduction of beneficial microorganisms such as nitrifying bacteria. The bottom of the algae tank is equipped with multiple bio-stones to fix large algae. The volume of the algae tank is 50-70% of the total volume of the sump.

[0015] Furthermore, in step S1, the main tank draws seawater to the lower water compartment through the overflow pipe, and the upper water compartment circulates seawater into the main tank through a water pump. The flow rate of the water pump per hour is 5-6 times the total amount of seawater in the aquaculture tank.

[0016] Furthermore, in step S1, the upper water compartment is equipped with a freshwater replenishment float, which is connected to a freshwater pipe to replenish the evaporated water in the aquaculture tank and prevent the salinity of the water in the aquaculture tank from being too high.

[0017] Furthermore, in step S1, a wet-dry separation box is provided between the main tank and the drain compartment. The wet-dry separation box is equipped with filter cotton. The seawater in the main tank first enters the wet-dry separation box through the overflow pipe to filter out larger organic particles before entering the drain compartment. The filter cotton in the wet-dry separation box is cleaned every 2-3 days.

[0018] The aquaculture system of this invention is equipped with thick sand and a dry-wet separation box, which can effectively absorb and separate the feces and uneaten feed produced by the metabolism of clownfish fry, thereby purifying the water body without the need for additional water treatment devices, thus saving costs.

[0019] Further, in step S2, the culture tank is filled with water, and 1-2 ppm of potassium permanganate solution is added to the culture tank and soaked for 10-15 minutes, or bleaching powder is added to the culture tank at a rate of 2-10g per cubic meter of water and soaked for more than 24 hours to clean and disinfect the culture tank and prevent fish diseases after culture. After disinfection, the culture tank is rinsed with clean seawater and then clean seawater is added to the culture tank.

[0020] Furthermore, in step S2, the depth of clean seawater in the main tank is 60-80cm, and the depth of clean seawater in the sump is 30-40cm, so that the volume of water in the sump is about half the volume of water in the main tank.

[0021] Furthermore, in step S3, the seawater temperature in the main tank is maintained at 27±1℃ and dissolved oxygen is greater than 5mg / L. Nitrifying bacteria solution is initially added to the main tank at a ratio of 30-40ml of nitrifying bacteria per 100 liters of water. Subsequently, nitrifying bacteria solution is added to the main tank every 2-3 days at a ratio of 10ml of nitrifying bacteria per 100 liters of water. Cooked shrimp meat is also added to the main tank to provide nutrition for the reproduction of nitrifying bacteria. The culture is carried out for 10-14 days.

[0022] Further, in step S4, the clownfish fry include at least one of the following: white-striped clownfish fry, iris clownfish fry, bigeye clownfish fry, and anemone clownfish fry;

[0023] Macroalgae include at least one of racemose ferns, long-stemmed grape ferns, and feathery ferns.

[0024] Furthermore, in step S4, 700-800 clownfish fry are introduced into each cubic meter of the main tank, with each clownfish fry weighing 0.2-0.3g and measuring 1-1.2cm in length, and 1000-1200g of large algae are introduced into each cubic meter of the algae tank.

[0025] Furthermore, in step S5, clownfish fry feed is added to the main tank at 8:00, 12:00 and 17:00 every day for 10-15 minutes. The amount of feed added gradually increases with the breeding time and the growth of the clownfish fry. The feed is used in combination with Clostridium butyricum. The Clostridium butyricum is mixed evenly with the feed before feeding. The concentration of Clostridium butyricum is 3-5 billion / kg, and the protein content in the feed is above 45%.

[0026] Furthermore, in step S5, during the cultivation process, the main tank and the algae tank are simultaneously illuminated. The light intensity of the main tank is 4000-6000 l x, and the algae tank is illuminated with 1w of power light per liter of water. The main tank and the algae tank are illuminated for 8-12 hours per day.

[0027] Furthermore, in step S5, for the first three days of cultivation, the water quality in the cultivation tank is tested every morning before light exposure and every evening after light exposure. Once the water quality stabilizes (i.e., the water is clear and no brown algae grows on the surface of the coral sand on the tank walls and bottom), the water quality in the cultivation tank is tested every five days to control the water temperature in the cultivation tank at 27±1℃, pH at 7.9~8.3, salinity at 28‰~32‰, dissolved oxygen greater than 5mg / L, nitrite concentration less than 0.01mg / L, ammonia nitrogen concentration less than 0.2mg / L, and phosphate concentration <0.1mg / L.

[0028] Furthermore, in step S5, when the water quality test is abnormal, more than 50% of the seawater in the breeding tank is replaced, and excess organic matter, feed and feces in the breeding tank are cleaned up. At the same time, nitrifying bacteria liquid is added to the main tank every ten days at a ratio of 10 ml of nitrifying bacteria per 100 liters of water to quickly re-establish the circulating aquatic ecosystem.

[0029] Under normal water quality conditions, replace about 10% of the seawater in the aquarium every 10-15 days, and clean the tank walls every 3-4 days to remove green algae and keep the tank walls transparent. Changing the water not only refreshes the aquarium water, prevents water pollution, and maintains water quality, but also replenishes the nutrients needed for the growth of large algae from the seawater.

[0030] Beneficial effects:

[0031] (1) The ecological cultivation method of clownfish fry of the present invention changes the existing marine cage culture and outdoor pond culture methods. It uses a culture tank recirculating water system for culture, which significantly reduces the area occupied, makes the culture environment easier to control, and the cultivation operation is simple and easy to manage. It is a relatively convenient and efficient cultivation method.

[0032] (2) The ecological cultivation method for clownfish fry of the present invention involves co-culturing clownfish fry with large algae and introducing nitrifying bacteria. The clownfish fry's metabolic waste and excess uneaten feed produce ammonia nitrogen and nitrite, which can harm their health. The nitrifying bacteria convert ammonia nitrogen and nitrite into nitrate, which is then absorbed and utilized by the large algae, thus ensuring the healthy growth of the clownfish fry and promoting the growth of the large algae. This effectively avoids eutrophication, reduces water changes, and saves on cultivation costs, exhibiting characteristics of being green, environmentally friendly, and highly efficient. Therefore, the ecological cultivation method for clownfish fry of the present invention has high ecological and economic benefits, and greatly promotes the artificial cultivation of clownfish and the large-scale cultivation of large algae. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Example 1

[0035] This embodiment provides an ecological cultivation method for whitebait fry, including the following steps:

[0036] S1. Constructing an ecological aquaculture tank

[0037] A main tank (135cm x 100cm x 80cm) and a sump (135cm x 100cm x 40cm) are set up to form a circulating aquaculture system. The main tank is located above the sump, with an 8cm thick layer of coral sand at its bottom. A light is installed above the main tank. The sump is divided along its length by a glass plate into a lower water compartment, an algae compartment, and an upper water compartment. Both the lower and upper water compartments are connected to the main tank, forming a circulating aquaculture system. The water levels in the lower, algae, and upper water compartments decrease sequentially, allowing seawater to flow from the lower compartment through them. Multiple bio-stones are placed at the bottom of the algae compartment to hold large algae in place. The volume of the algae compartment is 60% of the total volume of the sump. A 100W algae lamp is installed above the algae compartment.

[0038] The main tank and the drain compartment are connected by an overflow pipe to direct seawater from the main tank to the drain compartment. A wet / dry separation box is also installed between the main tank and the drain compartment. This box contains filter cotton, allowing seawater from the main tank to first enter the wet / dry separation box through the overflow pipe to filter out larger organic particles (such as feces from whitebait fry and uneaten food) before entering the drain compartment, thus purifying the water. During the breeding process, the filter cotton in the wet / dry separation box should be cleaned or replaced every 2-3 days.

[0039] The main tank and the upper water compartment are connected by a water pump to pump seawater from the upper water compartment back into the main tank. The pump flow rate is set to 5 times the total amount of seawater in the aquaculture tank. The upper water compartment is also equipped with a freshwater replenishment float, which is connected to an external freshwater pipe to replenish the aquaculture tank with evaporated water during the aquaculture process, preventing the salinity of the water in the aquaculture tank from becoming too high.

[0040] S2, Cleaning and Disinfection

[0041] Fill the breeding tank with water at a concentration of 10g / m³. 3 Add bleach to the aquaculture tank and soak for more than 24 hours to clean and disinfect the tank and prevent fish diseases after aquaculture. After disinfection, rinse the tank with clean seawater and then fill it with clean seawater. The depth of clean seawater in the main tank should be 80cm and the depth of clean seawater in the bottom tank should be 40cm.

[0042] S3, Water Treatment

[0043] Maintain the seawater temperature in the main tank at 27±1℃ and dissolved oxygen greater than 5mg / L. Initially add nitrifying bacteria solution to the main tank at a ratio of 30ml of nitrifying bacteria per 100 liters of water. Then, add nitrifying bacteria solution to the main tank every 2-3 days at a ratio of 10ml of nitrifying bacteria per 100 liters of water. Add cooked shrimp meat to the main tank to provide nutrients for the reproduction of nitrifying bacteria. Cultivate for 14 days to build a complete recirculating aquatic ecosystem.

[0044] S4, Add fish algae

[0045] Add whitebait fry to the main tank at a rate of 800 fry per cubic meter, with each fry weighing 0.3g and measuring 1cm in length. Add racemose algae to the algae tank at a rate of 1000g per cubic meter.

[0046] S5, Daily Management

[0047] (1) Feeding Management: At 8:00, 12:00 and 17:00 every day, feed the main tank with special feed for whitebait fry. The protein content of the feed is above 45%, and it is mixed with Clostridium butyricum. The Clostridium butyricum is mixed evenly with the feed and fed. The concentration of Clostridium butyricum is 4 billion / kg. The amount of feed is gradually increased with the breeding time and the growth of the whitebait fry. The entire feeding process is completed within 15 minutes.

[0048] (2) Regular lighting: During the breeding process, the main tank and the algae tank are lit at the same time. The light intensity of the main tank is 5000 l x, and the algae tank is lit with 1w of power light per liter of water. The main tank and the algae tank are lit for 12 hours a day (6:00-18:00).

[0049] (3) Water quality testing: For the first three days of breeding, the water quality in the breeding tank was tested every morning before sunlight (before 6:00) and every evening after sunlight (after 18:00). After the breeding water quality stabilized, the water quality in the breeding tank was tested every five days to control the water temperature in the breeding tank at 27±1℃, pH at 7.9~8.3, salinity at 28‰~32‰, dissolved oxygen greater than 5mg / L, nitrite concentration less than 0.01mg / L, ammonia nitrogen concentration less than 0.2mg / L, and phosphate concentration <0.1mg / L.

[0050] (4) Water change: When the water quality test is abnormal, immediately replace more than 50% of the seawater in the breeding tank and clean up the excess organic matter, feed and feces in the breeding tank. At the same time, every ten days, add nitrifying bacteria liquid to the main tank at a ratio of 10ml of nitrifying bacteria per 100 liters of water to quickly re-establish the circulating water ecosystem.

[0051] Under normal water quality conditions, replace approximately 10% of the seawater in the aquarium every 10 days, and clean the tank walls every 3 days to remove algae and maintain transparency. Water changes not only refresh the aquarium water, prevent pollution, and maintain healthy water quality, but also replenish the nutrients needed for the growth of large algae from the seawater.

[0052] S6, Harvest

[0053] After two months of cultivation, the whitebait reached a length of over 3cm, meeting the market size for ornamental fish. At this point, the *Cypripedium racemosa* weighed approximately 15,000g. The growth of *Cypripedium racemosa* during cultivation showed a trend of slow initial growth followed by rapid growth, allowing for multiple harvests. The stable concentrations of nitrite, phosphate, and ammonia nitrogen in the cultivation water indicated that the presence of *Cypripedium racemosa* and nitrifying bacteria effectively controlled the levels of nitrogen (N) and phosphorus (P) in the water, playing a purifying and adsorbing role in the ecological aquaculture system and reducing the concentrations of toxic nitrite, phosphate, and ammonia nitrogen in the cultivation water.

[0054] Example 2

[0055] This embodiment provides an ecological cultivation method for bigeye bream fry, including the following steps:

[0056] S1. Constructing an ecological aquaculture tank

[0057] A main tank (120cm x 100cm x 70cm) and a sump (120cm x 100cm x 40cm) are set up to form a circulating aquaculture system. The main tank is located above the sump, with an 8cm thick layer of coral sand at its bottom. A light is installed above the main tank. The sump is divided along its length by a glass plate into a lower water compartment, an algae compartment, and an upper water compartment. Both the lower and upper water compartments are connected to the main tank, forming a circulating aquaculture system. The water levels in the lower, algae, and upper water compartments decrease sequentially to allow seawater to flow from the lower compartment through them. Multiple bio-stones are placed at the bottom of the algae compartment to hold large algae in place. The volume of the algae compartment is 70% of the total volume of the sump. A 100W algae lamp is installed above the algae compartment.

[0058] The main tank and the drain compartment are connected by an overflow pipe to direct seawater from the main tank to the drain compartment. A wet / dry separation box is also installed between the main tank and the drain compartment. This box contains filter cotton, allowing seawater from the main tank to first enter the wet / dry separation box through the overflow pipe to filter out larger organic particles (such as feces from bigeye fry and uneaten food) before entering the drain compartment, thus purifying the water. During the breeding process, the filter cotton in the wet / dry separation box should be cleaned or replaced every 2-3 days.

[0059] The main tank and the upper water compartment are connected by a water pump to pump seawater from the upper water compartment back into the main tank. The pump flow rate is set to 5 times the total amount of seawater in the aquaculture tank. The upper water compartment is also equipped with a freshwater replenishment float, which is connected to an external freshwater pipe to replenish the aquaculture tank with evaporated water during the aquaculture process, preventing the salinity of the water in the aquaculture tank from becoming too high.

[0060] S2, Cleaning and Disinfection

[0061] Fill the breeding tank with water at a concentration of 10g / m³. 3Add bleach to the aquaculture tank and soak for more than 24 hours to clean and disinfect the tank, preventing fish diseases after aquaculture. After disinfection, rinse the tank with clean seawater, and then fill the tank with clean seawater. The depth of clean seawater in the main tank should be 70cm, and the depth of clean seawater in the bottom tank should be 40cm.

[0062] S3, Water Treatment

[0063] Maintain the seawater temperature in the main tank at 27±1℃ and dissolved oxygen greater than 5mg / L. Initially add nitrifying bacteria solution to the main tank at a ratio of 30ml of nitrifying bacteria per 100 liters of water. Then, add nitrifying bacteria solution to the main tank every 2-3 days at a ratio of 10ml of nitrifying bacteria per 100 liters of water. Add cooked shrimp meat to the main tank to provide nutrients for the reproduction of nitrifying bacteria. Cultivate for 14 days to build a complete recirculating aquatic ecosystem.

[0064] S4, Add fish algae

[0065] Add 800 large-eyed wrasse fry per cubic meter of main tank, each weighing 0.3g and measuring 1cm in length. Add 1000g of long-stemmed grape aquatic plants per cubic meter of algae tank.

[0066] S5, Daily Management

[0067] (1) Feeding Management: At 8:00, 12:00 and 17:00 every day, feed the main tank with special feed for bigeye scorpion fry. The protein content of the feed is above 45%, and it is mixed with Clostridium butyricum. The Clostridium butyricum is mixed evenly with the feed and fed. The concentration of Clostridium butyricum is 4 billion / kg. The amount of feed is gradually increased with the breeding time and the growth of the bigeye scorpion fry. The entire feeding process is completed within 15 minutes.

[0068] (2) Regular lighting: During the breeding process, the main tank and the algae tank are lit at the same time. The light intensity of the main tank is 5000 l x, and the algae tank is lit with 1w of power light per liter of water. The main tank and the algae tank are lit for 12 hours a day (6:00-18:00).

[0069] (3) Water quality testing: For the first three days of breeding, the water quality in the breeding tank was tested every morning before sunlight (before 6:00) and every evening after sunlight (after 18:00). After the breeding water quality stabilized, the water quality in the breeding tank was tested every five days to control the water temperature in the breeding tank at 27±1℃, pH at 7.9~8.3, salinity at 28‰~32‰, dissolved oxygen greater than 5mg / L, nitrite concentration less than 0.01mg / L, ammonia nitrogen concentration less than 0.2mg / L, and phosphate concentration <0.1mg / L.

[0070] (4) Water change: When the water quality test is abnormal, immediately replace more than 50% of the seawater in the breeding tank and clean up the excess organic matter, feed and feces in the breeding tank. At the same time, every ten days, add nitrifying bacteria liquid to the main tank at a ratio of 10ml of nitrifying bacteria per 100 liters of water to quickly re-establish the circulating water ecosystem.

[0071] Under normal water quality conditions, replace approximately 10% of the seawater in the aquarium every 10 days, and clean the tank walls every 3 days to remove algae and maintain transparency. Water changes not only refresh the aquarium water, prevent pollution, and maintain healthy water quality, but also replenish the nutrients needed for the growth of large algae from the seawater.

[0072] S6, Harvest

[0073] After two months of cultivation, the bigeye wrasses all reached a length of over 3cm, meeting the market size for ornamental fish. At this time, the weight of the long-stemmed grape aquatic organism was approximately 13550g. During cultivation, the growth of the long-stemmed grape aquatic organism showed a trend of slow growth followed by rapid growth, so it could be harvested in multiple stages. The concentrations of nitrite, phosphate, and ammonia nitrogen in the cultivation water remained stable, indicating that the presence of long-stemmed grape aquatic organisms and nitrifying bacteria effectively controlled the content of N and P in the water, playing a purifying and adsorbing role in the ecological aquaculture system, and reducing the concentrations of toxic nitrite, phosphate, and ammonia nitrogen in the cultivation water.

[0074] Comparative Example 1

[0075] This comparative example provides an ecological cultivation method for whitebait fry. The main cultivation steps and breeding time are the same as in Example 1. The main difference between Example 1 and Example 2 is that no bottom tank (lower water tank, algae tank and upper water tank) is set up. Only the main tank is used to cultivate whitebait fry. The main tank is changed every 1-2 days, and the amount of water changed is 5% of the total amount of breeding water.

[0076] Comparative Example 2

[0077] This comparative example provides an ecological cultivation method for bigeye scorpion fry. The main cultivation steps and breeding time are the same as in Example 2. The main difference between Example 2 and Example 2 is that no bottom tank (lower water tank, algae tank and upper water tank) is set up. Only the main tank is used to cultivate bigeye scorpion fry. The water in the main tank is changed every 1-2 days, and the amount of water changed is 5% of the total breeding water.

[0078] Table 1 shows the performance of fish and algae at the beginning and end of culture in Examples 1-2 and Comparative Examples 1-2.

[0079] Table 1

[0080]

[0081] Table 2 shows the water quality of the culture water during the culture process in Examples 1-2 and Comparative Examples 1-2.

[0082] Table 2

[0083]

[0084]

[0085] As shown in Table 2, the fish-algae mixed culture method of the present invention can further reduce the concentration of nitrite, phosphate and ammonia nitrogen in the culture water compared with the separate culture of fish fry. This indicates that the presence of large algae can effectively control the content of N and P in the water, play a purifying and adsorbing role in the ecological aquaculture system, and reduce the concentration of toxic nitrite, phosphate and ammonia nitrogen in the culture water.

[0086] As shown in Table 1, the water exchange volume of the fish-algae mixed culture method of the present invention is only one-quarter of that required for raising fish fry alone, significantly reducing the water exchange volume and achieving the goals of water conservation and cost reduction. Furthermore, the fish harvested from the fish-algae mixed culture method of the present invention are longer than those harvested from raising fish fry alone, and more than 15 times the size of the algae can also be harvested. This indicates that the fish-algae mixed culture method of the present invention can simultaneously promote the growth of both fish and algae, greatly promoting the artificial breeding of clownfish and the large-scale cultivation of large algae.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An ecological cultivation method for clownfish fry with a short rearing cycle, characterized in that, Includes the following steps: S1. Construction of an ecological aquaculture tank: A circulating aquaculture tank consisting of a main tank and a sump tank is set up. The main tank is located above the sump tank. The sump tank includes a water outlet, an algae tank, and a water inlet, which are connected in sequence and have progressively decreasing water levels. The water outlet and the water inlet are both connected to the main tank to form a circulation system. The bottom of the main tank is covered with 8-10cm thick coral sand. A dry-wet separation box is provided between the main tank and the water outlet, and filter cotton is installed inside the dry-wet separation box. S2. Clean and disinfect the aquaculture tank, and then fill the tank with clean seawater. S3, Water Conditioning: Cultivate nitrifying bacteria in the main tank to build a complete recirculating aquatic ecosystem; S4. Add fish and algae: Add clownfish fry weighing 0.2-0.3g and 1-1.2cm in length to the main tank, and add large algae to the algae tank compartment; S5. Daily Management: Regularly feed the main tank with clownfish fry feed, regularly illuminate the tank, and regularly test and change the water quality in the tank. For the first three days of aquaculture, the water quality in the aquaculture tank was tested every morning before light exposure and every evening after light exposure. Once the water quality stabilized and became clear, and no brown algae grew on the surface of the coral sand on the tank walls and bottom, the water quality in the aquaculture tank was tested every five days to control the water temperature at 27±1℃, pH at 7.9~8.3, salinity at 28‰~32‰, dissolved oxygen greater than 5mg / L, nitrite concentration less than 0.01mg / L, ammonia nitrogen concentration less than 0.2mg / L, and phosphate concentration <0.1mg / L. When the water quality test is abnormal, replace more than 50% of the seawater in the breeding tank and clean up the excess organic matter, feed and feces in the breeding tank. At the same time, add nitrifying bacteria solution to the main tank every ten days at a ratio of 10ml of nitrifying bacteria per 100 liters of water to quickly rebuild the circulating water ecosystem. Under normal water quality conditions, replace about 10% of the seawater in the aquarium every 10-15 days, and clean the tank walls every 3-4 days to remove algae and keep the tank walls transparent. S6. Harvesting: Once the clownfish have grown to the marketable size of 3-5cm, the breeding is over, and the clownfish and large algae are harvested.

2. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S1, the bottom of the algae tank is provided with multiple bio-stones, and the volume of the algae tank is 50-70% of the total volume of the bottom tank.

3. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S1, the filter cotton in the dry-wet separation box is cleaned every 2-3 days.

4. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S1, the upper water compartment is equipped with a freshwater replenishment float, which is connected to a freshwater pipe to replenish the evaporated water in the aquaculture tank.

5. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S2, the aquaculture tank is filled with water, and 1-2 ppm of potassium permanganate solution is added to the tank and soaked for 10-15 minutes. Alternatively, bleaching powder is added to the tank at a rate of 2-10 g per cubic meter of water and soaked for more than 24 hours to clean and disinfect the tank. After disinfection, the tank is rinsed with clean seawater and then clean seawater is added to the tank.

6. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S3, the seawater temperature in the main tank is maintained at 27±1℃ and dissolved oxygen is greater than 5mg / L. Nitrifying bacteria solution is initially added to the main tank at a ratio of 30-40ml of nitrifying bacteria per 100 liters of water. After that, nitrifying bacteria solution is added to the main tank every 2-3 days at a ratio of 10ml of nitrifying bacteria per 100 liters of water. Cooked shrimp meat is also added to the main tank to provide nutrition for the reproduction of nitrifying bacteria. The culture is carried out for 10-14 days.

7. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S4, the clownfish fry include at least one of the following: white-striped clownfish fry, eye-spotted clownfish fry, big-eyed clownfish fry, and anemone clownfish fry. The macroalgae include at least one of *Pteridophyta racemosa*, *Pteridophyta longifolia*, and *Pteridophyta pinnata*.

8. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S4, 700-800 clownfish fry are put into each cubic meter of main tank, each fry weighing 0.2-0.3g and measuring 1-1.2cm in length. 1000-1200g of large algae are put into each cubic meter of algae tank.

9. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S5, clownfish fry feed is added to the main tank at 8:00, 12:00 and 17:00 every day for 10-15 minutes. The amount of feed added gradually increases with the breeding time and the growth of the clownfish fry. The feed is used in combination with Clostridium butyricum. The Clostridium butyricum is mixed evenly with the feed before feeding. The concentration of Clostridium butyricum is 3-5 billion / kg, and the protein content in the feed is above 45%.

10. The ecological cultivation method for clownfish fry with a short breeding cycle according to claim 1, characterized in that: In step S5, during the cultivation process, the main tank and the algae tank are simultaneously illuminated. The light intensity of the main tank is 4000-6000 lx, and the algae tank is illuminated with 1w of light per liter of water. The main tank and the algae tank are illuminated for 8-12 hours per day.

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