CATDOLL : CATDOLL: Leech breeding technology (profit from raising leeches per acre per year)

1. How to breed leeches?

1. Site selection for pond construction Choose a place that is sheltered from the wind, facing the sun, and convenient for irrigation and drainage. The pond is 3 meters wide, 1 meter deep, and has no limit on length. Set up water inlets and outlets at the diagonal corners of the pond, and put some stones and branches at the bottom of the pond for leeches to live. Small-scale breeding can be carried out in puddles, wasteland ponds, and ponds. The inlet and outlet should be fenced with wire mesh or plastic mesh to prevent leeches from escaping. 2. Seedling placement For artificial breeding, it is best to use the golden leech (commonly known as the cow leech), and tea-colored leeches can also be placed here. Golden leeches are very common in rice fields, ponds, streams, and jungles. When catching them for breeding, you should pay attention to identification. The standard for seed placement is about 10,000 per cubic meter. The selection criteria are: strong, uninjured, large in size (20 to 30 grams is best), such leeches lay a lot of eggs, have a high hatching rate, and can be processed and sold after 10 months of stocking. 3. Leeches mainly feed on snails, clams, frogs, turtles, earthworms and the blood of mammals. Artificial breeding can use various blood mixed with feed, grass powder, and even feces. About 25 kg of live snails can be released per mu at a time to allow them to reproduce naturally, and leeches can feed freely. Animal blood is generally fed once a week. The specific method is: put blood clots of animals such as pigs, cattle and sheep into the pool, and put one piece every 5 meters. Leeches will quickly gather after smelling the fishy smell, and disperse on their own after sucking. 4. Management technology The first is to adjust the water quality. Although leeches can grow in sewage, due to the high density of artificial breeding, the water quality should be kept fresh, and a certain amount of dissolved oxygen should be guaranteed. When the oxygen content in the water is lower than 2 mg/L, leeches will float to the surface and become restless. In summer, the water temperature is high, so pay attention to proper water changes. The second is winter management. Leeches hibernate in winter, and those released in early spring are generally well grown and can be processed and sold. When catching, drain the water first, then scoop it up with a net. Select large and strong individuals for seed, and keep 10 to 15 kilograms per mu, and put them into the breeding pool for wintering. When the temperature of the insulation pool is above 15℃ in winter, leeches can feed and grow, so as to shorten the breeding cycle and achieve the purpose of year-round breeding. When the water temperature of the breeding pool is between 15 and 30℃, leeches grow well. They stop feeding below 10℃, and their growth is affected when the temperature is above 35℃. 5. Reproduction Leeches reproduce quickly and have strong regeneration ability. The Yangtze River Basin generally has a spawning period from late April to mid-June. The egg cocoons of artificially cultivated leeches are produced in the mud on the waterside of the breeding pool platform and are oval in shape. Each leech produces about 4 cocoons at a time. The small leeches hatch about 16 to 25 days after the cocoons are produced, and each cocoon can produce 13 to 35 leeches. The small leeches are tea yellow in color and grow rapidly. They grow an average of 20 mm in length within one month after hatching.

2. How to breed leeches?

1. Site selection and pool construction

Choose a place that is sheltered from the wind, facing the sun, and convenient for drainage and irrigation to build a pond. The pond should be 3 meters wide, 1 meter deep, and of unlimited length. Set up water inlets and outlets at the diagonal corners of the pond, and put some stones and branches at the bottom of the pond for leeches to live in. For small-scale breeding, puddles, waste ponds, and ponds can be used for breeding. The inlet and outlet should be fenced with wire mesh or plastic mesh to prevent leeches from escaping.

2. Seedling placement

Leeches (commonly known as cow leeches) are preferred for artificial breeding. Brown leeches can also be placed here. Leeches are very common in rice fields, ponds, streams, and jungles. When catching them for breeding, you should pay attention to identification. The standard for seedlings is about 10,000 per cubic meter. The selection criteria are: strong, uninjured, large in size (20 to 30 grams is best), and the leeches lay a lot of eggs and have a high hatching rate. They can be processed and sold after 10 months of breeding.

3. Feeding

Leeches mainly feed on snails, clams, frogs, turtles, earthworms and the blood of mammals. In artificial breeding, various blood can be mixed with feed, grass powder, and even feces. About 25 kilograms of live snails can be released at one time per mu, and they can be allowed to reproduce naturally, and leeches can feed freely. Animal blood is generally fed once a week. The specific method is: put blood clots of animals such as pigs, cattle and sheep into the pool, and put one piece every 5 meters. Leeches will quickly gather after smelling the fishy smell, and disperse on their own after sucking.

4. Management technology

The first is to regulate the water quality. Although leeches can grow in sewage, due to the high density of artificial breeding, the water quality should be kept fresh, and a certain amount of dissolved oxygen should be guaranteed. When the oxygen content in the water is lower than 2 mg/L, leeches will float to the surface and become restless. In summer, the water temperature is high, so pay attention to proper water changes. The second is winter management. Leeches hibernate in winter, and those released in early spring generally grow well and can be processed and sold. When fishing, drain the water first, and then scoop them up with a net. Select large and strong individuals for seed, and keep 10 to 15 kilograms per mu, and concentrate them in the breeding pool for wintering. When the temperature of the insulation pool is above 15℃ in winter, leeches can feed and grow, so as to shorten the breeding cycle and achieve the purpose of year-round breeding. When the water temperature of the breeding pool is between 15 and 30℃, leeches grow well, stop feeding below 10℃, and affect growth above 35℃.

5. Reproduction

Leeches reproduce quickly and have strong regeneration ability. The Yangtze River Basin generally lays eggs from late April to mid-June. The egg cocoons of artificially cultivated leeches are laid in the mud on the waterside of the breeding pool platform and are oval in shape. Each leech lays about 4 cocoons at a time. The baby leeches hatch about 16 to 25 days after the cocoons are laid, and each cocoon can produce 13 to 35 leeches. The baby leeches are tea yellow in color and grow rapidly, growing an average of 20 mm in length within one month after hatching.

3. How to breed leeches?

1. Site selection and pool construction

Choose a place that is sheltered from the wind, facing the sun, and convenient for drainage and irrigation to build a pond. The pond should be 3 meters wide, 1 meter deep, and of unlimited length. Set up water inlets and outlets at the diagonal corners of the pond, and put some stones and branches at the bottom of the pond for leeches to live in. For small-scale breeding, puddles, waste ponds, and ponds can be used for breeding. The inlet and outlet should be fenced with wire mesh or plastic mesh to prevent leeches from escaping.

2. Seedling placement

Leeches (commonly known as cow leeches) are preferred for artificial breeding. Brown leeches can also be placed here. Leeches are very common in rice fields, ponds, streams, and jungles. When catching them for breeding, you should pay attention to identification. The standard for seedlings is about 10,000 per cubic meter. The selection criteria are: strong, uninjured, large in size (20 to 30 grams is best), and the leeches lay a lot of eggs and have a high hatching rate. They can be processed and sold after 10 months of breeding.

3. Feeding

Leeches mainly feed on snails, clams, frogs, turtles, earthworms and the blood of mammals. In artificial breeding, various blood can be mixed with feed, grass powder, and even feces. About 25 kilograms of live snails can be released at one time per mu, and they can be allowed to reproduce naturally, and leeches can feed freely. Animal blood is generally fed once a week. The specific method is: put blood clots of animals such as pigs, cattle and sheep into the pool, and put one piece every 5 meters. Leeches will quickly gather after smelling the fishy smell, and disperse on their own after sucking.

4. Management technology

The first is to regulate the water quality. Although leeches can grow in sewage, due to the high density of artificial breeding, the water quality should be kept fresh, and a certain amount of dissolved oxygen should be guaranteed. When the oxygen content in the water is lower than 2 mg/L, leeches will float to the surface and become restless. In summer, the water temperature is high, so pay attention to proper water changes. The second is winter management. Leeches hibernate in winter, and those released in early spring generally grow well and can be processed and sold. When fishing, drain the water first, and then scoop them up with a net. Select large and strong individuals for seed, and keep 10 to 15 kilograms per mu, and concentrate them in the breeding pool for wintering. When the temperature of the insulation pool is above 15℃ in winter, leeches can feed and grow, so as to shorten the breeding cycle and achieve the purpose of year-round breeding. When the water temperature of the breeding pool is between 15 and 30℃, leeches grow well, stop feeding below 10℃, and affect growth above 35℃.

5. Reproduction

Leeches reproduce quickly and have strong regeneration ability. The Yangtze River Basin generally lays eggs from late April to mid-June. The egg cocoons of artificially cultivated leeches are laid in the mud on the waterside of the breeding pool platform and are oval in shape. Each leech lays about 4 cocoons at a time. The baby leeches hatch about 16 to 25 days after the cocoons are laid, and each cocoon can produce 13 to 35 leeches. The baby leeches are tea yellow in color and grow rapidly, growing an average of 20 mm in length within one month after hatching.

4. What is the best way to breed leeches?

1. Venue

When raising leeches, you need to choose a pond that is sheltered from the wind, facing the sun, and has convenient drainage and irrigation as the breeding site. The depth of the pond should be between one and two meters, and the width should be about three meters. Then the bottom of the pond should be grouted with cement, and the surrounding area should be filled with humus-rich sand, which is conducive to the leeches laying eggs.

2. Daily maintenance

When raising leeches, you need to feed them snails and animal blood regularly to encourage them to grow luxuriantly and healthily. In addition, you need to change the water for the leeches once a month to ensure the water is clean and hygienic, and control the water temperature between ten and forty degrees to prevent the leeches from being damaged by frost.

5. Leech breeding technology?

Select a location to build a pond. Choose a place that is sheltered from the wind, facing the sun, and convenient for irrigation and drainage. The pond should be 3 meters wide, 1 meter deep, and of unlimited length. Set up water inlets and outlets at the opposite corners of the pond, and put some stones and branches at the bottom of the pond for leeches to live. Small-scale breeding can be carried out in puddles, waste ponds, and ponds. The inlets and outlets should be fenced with wire mesh or plastic mesh to prevent leeches from escaping.

6. How to raise leeches? What are the leech breeding techniques and precautions?

Whether it is using earth ponds and mud pits in front of or behind houses, or in rivers and lakes, there are many different ways of breeding, but in summary, there are only two ways: outdoor extensive breeding and intensive breeding. The choice of which breeding method should be based on the actual local conditions. If the conditions are poor, you can use local materials and adopt outdoor extensive breeding; if the conditions are good, you can adopt intensive breeding, that is, build high-standard breeding ponds to provide a more ideal ecological environment for the growth and reproduction of leeches, and obtain a higher yield per unit area through factory breeding.

The first method of leech breeding: extensive breeding in the wild

Extensive breeding in the wild is a breeding method that utilizes natural conditions and protects the breeding range after it is enclosed. Extensive breeding in the wild does not mean leaving it alone. It also requires the release of sufficient seed sources, appropriate bait, and finally fishing. Generally, there are reservoir breeding, pond breeding, swamp breeding, lake breeding, river breeding, depression breeding and rice field breeding. These methods have a large breeding area, sufficient sunlight, abundant natural bait, small investment and high returns. However, the yield per unit area is low and it is not easy to manage. It is necessary to always pay attention to preventing natural enemies, preventing escape and changes in water level fluctuations. The following is a brief introduction to two of the breeding methods. (I) Swamp breeding Swamps are characterized by shallow water levels, lush aquatic plants, more organic matter and humus content in the bottom of the swamp, and rich plankton and aquatic animals. Therefore, as long as the fence is built, leeches can be released. Observe regularly and add bait appropriately. When the density is too high, fish in time. (II) Paddy field farming The characteristics of paddy fields are shallow water level, suitable water temperature, and shade from rice. From oxygen content to rich bait, they are suitable for the growth and reproduction of leeches. Therefore, different varieties of leeches grow in most rice fields in my country. For paddy field farming, you should choose a plot with convenient drainage and irrigation, sufficient water source, water-retaining soil, and good fertility, and surround it with a fence. In the middle of the paddy field, dig one or several ponds according to the size of the plot. Generally, it is appropriate to dig a 1 square meter pond in the middle of 100 square meters. At the same time, dig a protective connecting ditch about 30 cm deep and wide between ponds and around the paddy field to connect the ponds and ditches. When drying the field, laying the field, or applying fertilizer or spraying pesticides, use animal blood to lure leeches to the pond or protective connecting ditch to prevent the leeches from being killed. It is best to change fertilization to deep application of ball fertilizer, and it is best to change pesticide spraying to low-toxic or non-toxic pesticides.

The second type of leech breeding: intensive breeding Intensive breeding is a scientific breeding and management method that uses artificial ponds and feeds. Generally, there are fish pond breeding, field breeding, indoor breeding, courtyard breeding, and factory-based constant temperature breeding. These breeding methods have a large stocking density, relatively high capital investment, and require sophisticated breeding technology. However, the output per unit area is high and the economic benefits are good. (I) Physical properties of intensive breeding 1. Strong light transmittance and small water layer fluctuations: Because the water is shallow, sunlight can penetrate to the bottom of the pond, which is conducive to the healthy growth and development of plankton, submerged plants and benthic plants. At the same time, because the water is shallow, the upper and lower layers of the water are basically uniform, and only small fluctuations occur under windy and temperature changes. Provides a good living environment for leeches. 2. Uncertain water color and seasonal changes in water temperature: The color of the water often varies depending on the soil quality, water depth, type of fertilizer, and the growth and reproduction of plankton in the water. This is because the water is green when there are more phytoplankton, yellow when there are more zooplankton, brown or soy sauce color when there are more humus, turquoise when there are a lot of blue algae, yellow-green when there are a lot of fish algae, brown when there are a lot of ciliates, and red when there are a lot of water fleas. 1. The water temperature is the lowest in winter, gradually rises in spring, the highest in summer, and gradually decreases in autumn. The water temperature is higher from May to September in a year, which is a suitable period for leeches to grow and reproduce under natural conditions. l The average temperature in the middle of the day, generally the water temperature is higher than the air temperature, and the average temperature difference is that the water temperature is lower than the air temperature. In this way, the water temperature is relatively stable than the air temperature. The water temperature is often lower than the air temperature during the day, and higher than the air temperature at night. 3. If the water is deteriorating, the water will emit a foul smell: If the water has a special rotten smell or odor, it means that the water is polluted, indicating that the organic matter at the bottom of the pond, such as leftover bait, animal and plant remains, feces, etc., has decayed and generated toxic gases such as ammonia and hydrogen sulfide. At this time, the water should be changed or the pond should be emptied and cleaned in time to prevent the leeches from dying in large numbers.

(II) Chemical properties of intensive culture 1. Acidity (pH value). Acidity refers to the pH value of water in the pond. It is mainly the change in the ratio between free carbon dioxide and carbonates in the water. Its change range is generally between 6.5 and 9.5. The pH value changes periodically between day and night: at dawn, the carbon dioxide content is high and the pH value of the water decreases (becomes acidic); during the day, the carbon dioxide content decreases and the pH value of the water increases (becomes alkaline). Practice has shown that neutral or weakly alkaline water bodies are conducive to the growth and development of leeches. 2. Dissolved gas content. Gases include oxygen, carbon dioxide, nitrogen, ammonia, hydrogen sulfide and methane (marsh gas). Generally, the oxygen and carbon dioxide content in the water is more important. When the oxygen content in the water is greater than 0.7 mg/L, the leeches will move normally; when the dissolved oxygen in the water is less than 0.7 mg/L, the leeches will crawl out of the water and go to the soil or grass on the shore to breathe oxygen in the air. The content of these two gases in the pond is closely related to the diurnal variation of water temperature. The time with the highest oxygen content is in the afternoon, because the photosynthesis of green plants in the water is vigorous at this time, consuming carbon dioxide and producing a large amount of oxygen. The oxygen content in the water is lowest at dawn, because the photosynthesis of plants basically stops at night, while animals do not stop consuming oxygen and exhaling carbon dioxide. 3. The amount of dissolved inorganic salts. Inorganic salts include nitrates, phosphates, carbonates and silicates. The amount of dissolved salts has a direct impact on the number of plankton and other plants and animals, and the growth and reproduction of leeches.

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(III) Intensive biological composition In different regions and seasons, the biological composition of ponds is obviously different. But generally it is composed of the following major categories of organisms. 1. Plankton: Plankton is generally a tiny plant and animal that is invisible to the naked eye. Their mobility is limited, and most of them move passively by the flow of water. They are the main part of the pond organisms and have an important impact on the growth and development of leeches. Phytoplankton mainly includes lower phytoplankton, such as blue algae (Microcystis, Anabaena, etc.) that reproduce in large quantities in summer, green algae (Drum Algae, Coccosphere Algae, Volvox), and diatoms that grow vigorously in spring and autumn. Zooplankton mainly includes the most primitive and lowest class of animals in the animal kingdom. Most of them are single-cell organisms, such as Paramecium, Trumpet Worm, and Caudal Echinops. 2. Aquatic Plants: Aquatic plants mainly include the following. (1) Floating plants such as duckweed and duckweed, which float completely on the water surface or in the water. (2) Floating-leaf plants have leaves that float on the water surface, while their roots grow in the bottom soil of the pond, such as water chestnuts and water spinach. (3) Erect-leaf plants have roots in the soil, while their stems and leaves stand upright on the water surface, such as reeds and water chestnuts. 3. Benthic animals: Benthic animals include clams and snails among mollusks, shrimps and crabs among crustaceans, non-planktonic cladocerans and copepods, as well as maggot exuviae, chironomid larvae, clam python larvae, etc. 4. Other animals mainly include fish, leeches, water snakes, turtles, water rats, etc. 5. Fungi and bacteria In seriously polluted ponds, various fungi and bacteria that endanger the life of leeches multiply in large numbers, causing a great impact on the growth of leeches.