CATDOLL : CATDOLL: A new model for fish farming in small rivers? A new model for fish farming with black soldier flies?

1. A new model for fish farming in small rivers?

1. Fish farming in rice fields

Rice-fish farming should focus on rice, while fish farming should be considered. Grass carp should be the main fish in rice-fish farming, and some carp and Nile tilapia should be added according to local conditions.

Benefits: Raising fish in rice fields can promote rice production, increase the supply of aquatic products to society, and enrich people's "vegetable basket". It not only allows people to use less fertilizer in rice fields and save money, but also allows them to earn money from selling rice and raising fish.

2. Three-dimensional fish farming

Three-dimensional fish farming can raise a variety of fish, including grass carp, silver carp, bighead carp, dace, etc.

Benefits: The excrement and leftover feed of grass carp cultured in the upper layer become the main food source for silver carp and bighead carp in the middle layer of the pond. The excrement and leftover fish food of silver carp and bighead carp also become the feed for carp, crucian carp and dace living at the bottom of the water, forming a scientific food chain that is beneficial to the growth of many fish species.

3. Planting lotus roots and raising fish

The lotus pond is a natural environment for fish farming, where lotus roots, fish and loaches are mixed together.

Benefits: When cultivated in lotus ponds, lotus leaves provide shelter for fish and loaches, and loaches can loosen the soil and help lotus roots grow. In addition, lotus leaves can be used as fish feed, and fish excrement provides natural fertilizer for lotus roots. Lotus roots and fish taste very good. Generally, each acre of lotus roots can produce more than 900 kilograms, fish can produce more than 1,000 kilograms, and loaches can produce more than 2,000 kilograms.

4. Hierarchical breeding model

This graded breeding model divides the breeding process into primary, secondary and tertiary levels, using primary fry to raise to secondary fry, and then to tertiary adult fish.

Advantages: This breeding model can control the entire process of fish growth, do a good job of prevention and control in time, and provide fish all year round. A large farm in Guangzhou that relies on this breeding model produces 15,000 tons of grass carp a year, with an annual output value of 160 million yuan.

5. Fish farming in cages

Cage fish farming is a model of raising fish in cages made of mesh and placed in waters of a certain depth, relying on natural seawater and lake water. It is more suitable for breeding carp, non-carp, rainbow trout, and some fish.

Advantages: There are many methods of cage culture, such as floating and sinking. Cage culture can keep fish from contacting the soil, which can improve the processing performance and quality of fish and increase the price of fish. In addition, there are more humus and fertilizer water flowing in from mountains, farmlands and villages, which are rich in food organisms and are beneficial to the growth of fish.

6. Pig-Slurry-Grass-Fish Farming

This is an ecological integrated farming model. Pig manure is fermented in a biogas digester, and part of the waste residue and wastewater produced is used as fertilizer to grow grass and feed pigs, and part is used in fish ponds to raise fish.

Benefits: Farmers can not only obtain economic benefits from raising pigs, but also discharge pig manure and urine into biogas digesters for fermentation and deodorization. The generated biogas is used for heating, and most of the waste residue and wastewater are turned into organic fertilizer for growing a plant called sweet elephant grass. The rest flows into a large fish pond, where it is decomposed and absorbed by various microorganisms in the fish pond, and the microorganisms eventually become delicacies for tilapia and bighead carp. Not only does the quality of pigs improve, but fish farming also brings many additional benefits.

7. Flowing water fish farming

Flowing water fish farming is a method of raising fish in high density in a fish pond with water exchange, usually in lakes, rivers, etc.

Advantages: Flowing water fish farming can greatly improve the survival rate of fish, and the breeding density is also greatly improved. In the past, each acre could produce about 1,000 kilograms, but flow farming can achieve this output in about 20 square meters. The output has increased several times, and the quality and taste of the fish are quite good, making it very competitive in the market.

2. A new model for black soldier fly fish farming?

1. Dispose of waste.

The black soldier fly is an excellent public welfare insect and a new type of feed insect. It has excellent environmental organic waste absorption and transformation capabilities and can be used to treat kitchen waste, discarded vegetables, aquatic plants, animal feces, etc. It has the strongest ability to feed on food waste. Therefore, cultivating black soldier fly larvae and enabling them to process waste such as food waste has a good effect. Applying this characteristic of black soldier flies in agriculture and environmental protection can produce important economic, social and ecological value.

2. As feed.

Black soldier flies grow and reproduce quickly, and the animal protein converted into it has good nutritional content. It can be directly fed to animals and can also be used as a beneficial supplement to animal protein feed. It is a high-protein source and is environmentally friendly and economically beneficial.

3. What is the cost of raising fish in a three-dimensional water tank?

The cost of raising fish in a three-dimensional water tank is not fixed. For example, if you raise small tropical fish, the monthly cost is only 30 to 50 yuan. If you raise large tropical fish or cold-water fish, the monthly cost is only more than 100 yuan, because the oxygen supply system, filtration system, and illumination lamp heating rod used in fish farming are determined by the size of the fish tank and the size of the fish.

4. A new model of high-density dryland fish farming?

Pond selection: To raise fish, you must first choose a good pond, generally a water-retaining pond is preferred. Pond cleaning: Before preparing to raise fish, you must also clean and disinfect the pond. Only when the pond environment is good can the fish grow and live normally. Fish stocking: After all the preparations are done, you can put fish in the pond. Feeding management: The management work mainly involves setting bait, fertilizing, regulating water quality and preventing the occurrence of diseases and insect pests.

1. High-density fish farming technology

1. Pond selection: To raise fish, you must first choose a good pond. Generally, water-retaining ponds are most suitable for raising fish. At the same time, the water source must be sufficient. The pond must be drought-resistant and flood-resistant during the dry and rainy seasons.

2. Pond cleaning: After the pond is prepared, it can be cleaned and disinfected. Only when the pond environment is good can the fish grow and live normally. Pond disinfection mainly involves digging out excess silt in the pond, removing weeds in the pond and on the wall, and eliminating pathogens and pests. Quicklime can be used to disinfect the pond during the breeding production process.

3. Fish stocking: After the preparations are completed, fish can be stocked into the pond. The farmer must stock fish of good quality, strong quality, and appropriate density, and at the same time, the species composition must be reasonable.

4. Feeding and management: The normal growth and reproduction of fish are generally inseparable from feeding and management. The focus of management work is mainly on setting bait, fertilizing, regulating water quality and preventing the occurrence of diseases and pests.

5. Feeding: The daily amount of feed must be based on the "four observations", namely the season, weather, water color, and fish eating and activity conditions, and the "four determinations", namely the principles of timing, positioning, quality, and quantity.

6. Fertilization: Fertilization mainly includes basal fertilizer and topdressing. Basal fertilizer must be applied early and in sufficient quantity. Topdressing can be applied less and more frequently. The application of topdressing should also be carried out according to the weather, water and fish.

How many fish can be raised in a two-three-acre fish pond?

1. A three-acre fish pond can raise about 2,000 fish. Before raising fish, you must first raise water. Ordinary tap water cannot be used directly for fish. The water must be disinfected and dechlorinated before use. Disinfection can be done with relevant drugs or special salt. Dechlorination can be done by exposure to the sun or standing.

2. When raising fish, you must ensure that there is enough food. You must pay attention to feeding the fish in moderation, and feed them the amount that they can eat within 5-10 minutes each time. The feeding frequency must be determined according to the size of the fish, and try not to feed them at night or on cloudy days.

3. When raising fish, you must ensure that the water is clean and change the water regularly. The frequency of water changes can be determined according to the habits of the species being raised. Generally, the water should be changed every 7-10 days. Do not let the water temperature and water quality change too much each time you change the water. In addition to ensuring the cleanliness of the water, changing the water can also ensure the oxygen content of the water.

5. Layered and three-dimensional fish farming method?

The technical solution adopted by the present invention is as follows: A three-dimensional fish farming method comprises the following steps:

(1) Pond pretreatment: drain all the water in the pond, remove the stones and debris in the pond, expose the bottom of the pond to the sun for 1 to 3 days, and then evenly spread quicklime on the bottom of the pond for disinfection. The amount of quicklime spread is 10 kg/m2 to 15 kg/m2. Sprinkle a layer of 2 cm to 4 cm thick decomposed pig manure on the lime layer, and then expose the bottom of the pond to the sun for 3 to 5 days. Fill the pond with water until the water in the pond turns to tea brown or yellow brown;

(2) Fry pretreatment: Select healthy and disease-free silver carp fry weighing 80 g to 90 g, bighead carp fry weighing 80 g to 90 g, grass carp fry weighing 100 g to 120 g, bream fry weighing 100 g to 120 g, black carp fry weighing 110 g to 130 g, tilapia fry weighing 110 g to 130 g, and carp fry weighing 110 g to 130 g, respectively, and soak the selected fry in a methylene blue solution with a concentration of 1.5 mg/l to 1.8 mg/l for 25 min to 35 min;

(3) placing fish fry: placing the fish fry in step (2) into the pond in step (1), wherein the amount of fish fry placed is: 100 to 200 silver carp fry per mu, 100 to 200 bighead carp fry per mu, 120 to 150 grass carp fry per mu, 120 to 150 bream fry per mu, 150 to 180 black carp fry per mu, 150 to 180 tilapia fry per mu, and 150 to 180 carp fry per mu;

(4) Feeding: From the first day to the 35th day, the daily feed amount is 2.5 kg to 2.8 kg per mu, and thereafter, the daily feed amount is 3.2 kg to 3.5 kg per mu;

(5) Water quality control: The pH value of the water in the pond is controlled at 6.8-7.5. When the water temperature in the pond is above 28°C, the aerator is turned on to increase oxygen;

(6) Disease control: Disinfect the pond every 5 to 7 days; use isothiazolinone to kill insects once every 2 to 3 months;

6. How to build a three-dimensional fish pond?

First: Fish pond construction should be shortened, and human, financial and material resources should be concentrated on the construction of fish ponds in key areas; one pond should be completed at a time, and special attention should be paid to the shaping and compaction of the fish pond. Blind action should be avoided in construction, and the stall should not be spread too wide, otherwise it will be a half-finished project and production and operation activities cannot be carried out.

Second: Fish pond engineering has diversified shapes

The shape of the fish pond project is often rectangular and pit-shaped, so as to give full play to the three-dimensional benefits of the aquaculture water body. The area of ​​a single fish pond can be about 10 mu, the depth of the pond is 2.5-3 meters, the length-width ratio is 5:3, the slope coefficient is 2-3, the width of the pond is 5-10 meters, and the excavation volume of each fish pond is about 5000-6000 cubic meters. The construction shape of the fish pond can be easy first and then difficult, and some transitional fish ponds can be made, such as "U" shape, "high-low shape", "well" shape, "field" shape, etc. They are particularly suitable for the construction of fish ponds in low-lying lake fields, swamps, and tidal flats. Among them, the "U" shape fish pond is the most ideal transitional fish pond.

Third: Timely matching of irrigation and drainage systems

A complete water inlet and drainage system should include water inlet systems such as pump stations, water pumps, and water inlet channels, as well as drainage systems such as culverts, drainage ditches, and drainage gates. In addition, there are fish interception facilities combined with the water inlet and drainage systems. After the beginning of spring, the construction of the fish pond project is time-sensitive and the aquaculture production season is imminent. Therefore, it is required to focus on the construction of key parts in the overall deployment and arrangement of the project, such as synchronizing the construction of the drainage and irrigation system with the construction of the fish pond. In the planning and design, the location of the drainage and irrigation ditch should be reserved. In the specific construction, the branch canal and the ditch of the finalized fish pond should be built. The main canal, trunk canal and drainage ditch can be made with what is available and left to be built when the project is completed. In terms of construction form and materials, open channels are used, and masonry materials can be used for positioning and finalizing channels; soil channels can be used for those that are not positioned and finalized. For the construction of fish interception facilities, it is best to use steel fences. The basic requirements are that (fish) can be intercepted, (water) can flow smoothly, and (wind and wave) impact can be resisted.

Fourth: Ensure energy and power supply

Taking the construction of a fish pond with a water surface of 10 mu as an example, the technical and economic indicators of the designed unit yield of 750 kg are as follows: the total power per mu is 1 kilowatt, equipped with a 0.3-kilowatt aerator, an axial flow station with a power of 13 kilowatts and a diameter of 10 cm, and three submersible pumps with a diameter of 15 cm and a power of 2.2 kilowatts. This can ensure that about 1/5 of the pond water can be exchanged every day during the high temperature seasons of July, August and September, so that the quantity and quality of the pond water meet the needs of fish growth.

Fifth: Scientifically select the breeding model

For newly opened fish ponds, due to the light water quality, it is advisable to adopt a breeding model that mainly breeds herbivorous fish, supplemented by omnivorous fish, and appropriately raises filter-feeding fish.

7. Is the new land-based fish farming model reliable?

The new land-based fish farming model is reliable. Farming must be adapted to local conditions and carried out appropriately in combination with local farming conditions, advantageous varieties, and the farmers' production management techniques and experience.

In theory, land-based aquaculture is a farming model based on modern industrial foundation and advanced technology, with the characteristics of advanced farming equipment, controllable farming environment, high farming density per unit water body, high yield, and mechanized or automated operation throughout the farming process. It should be the main export of China's aquatic products. However, at present, China's aquatic products still mainly rely on traditional fish farm farming, because a few indoor farming can only provide shrimp, and the yield and quality cannot meet international standards.

8. What is the stocking density of a three-dimensional fish pond?

1. A one cubic meter fish pond can generally raise 10-15 fish, and the specific number depends on the type of fish.

2. When raising fish, it is generally calculated based on the water area, because the oxygen in the pond comes from the dissolved oxygen on the surface of the water on the one hand, and from the algae in the water on the other hand. Therefore, even if the water is deep, there is not enough oxygen to ensure the survival of fish.

9. What are the benefits of layered three-dimensional fish farming?

The layered three-dimensional fish farming method is relatively common in daily breeding experiments and is also a major breeding method.

The principle of fish farming is to use the living habits of different fish and the different water lengths in the water to make full use of the space. Generally, it is divided into bottom-stage fish and upper-middle-layer fish on the surface of the water. One is the common water body for breeding.

10. A new model of container fish farming has emerged. What are the advantages of using containers to farm fish?

Container fish farming is an emerging fish farming method. It is a continuous, three-dimensional intensive farming method. Circulating water and high-density controlled farming make it an efficient aquaculture system. First of all, container fish farming is divided into two modes according to different water treatment methods: "land-based push water" and "one-to-two".

The advantages of land-based water-pushing are: first, low breeding costs; second, simple harvesting in facility agriculture, which greatly reduces labor intensity.

Third, due to the high-density breeding in containers, precise control and centralized feeding are possible, which saves feed costs and reduces management costs.

The final advantage is that the quality of fish and shrimp is good because the water is constantly circulating. In addition, since the land-based push-water aquaculture box is equipped with a wastewater sedimentation system, the wastewater can be precipitated in multiple stages to remove suspended particles and then discharged into the pond, making the aquaculture itself extremely polluting. Moreover, since the amount of water change is large, the probability of disease occurrence will be greatly reduced. Since the aquaculture area is concentrated, the amount of drugs used for disease prevention and control is also greatly reduced, reducing the aquaculture cost and increasing the income of farmers.

The one-to-two type is different from the land-based water-pushing type. It belongs to a fully enclosed container farming, which includes an intelligent water treatment tank and two breeding tanks. Its core and key are all fully enclosed water treatment. The one-to-two container farming has a very prominent six-control system, which can realize the intelligent standardization, green ecology, resource intensiveness, and fine industrialization of farming. Its advantages are that it has many auxiliary equipment and can accurately adjust various indicators in the water body to ensure the best water quality for farming. It also has a constant temperature system, which can improve the survival rate of farming objects, meet the market demand of off-season, and obtain sustainable benefits. Finally, it meets the requirements of ecological environmental protection and greenness. The auxiliary equipment can timely handle the farming manure, reduce the risk of disease, and improve the level of farming.