How long does it take for a leech to grow to reproduce? How long does it take to go from seedling to

The ** of leech seedlings can be caught, purchased or self-propagated. At the beginning of farming, it is generally based on natural catch, and it can also be purchased from relevant units. There are three kinds of leeches that are traditionally used as medicinal purposes in China:

Artificial breeding is better for leeches. The leech is large in size and has a high yield. The leech is commonly known as the "cow leech" in the countryside.

Cattle often climb on cattle to suck blood, and attention should be paid to identification when capturing and breeding. Leech hermaphroditism, each leech can lay eggs and reproduce, in late March to April (Yangtze River Basin, the same below) spawning cocoons, egg cocoons are laid in the soil, generally laying 1 4 cocoons, the number of young leeches in each cocoon is 13 35, most about 20, each leech can reproduce 60 80 at a time. Young leeches appear in large numbers in June and grow rapidly, growing by an average of more than 20 mm within a month of hatching, and by the end of the month they are indistinguishable from adults.

It is advisable to put it in early spring. Early spring stocking in October can be grown and processed**.

<> artificial breeding: the growth cycle is about 1 and a half years, the oviposition period is from late May to late September every year, the egg cocoon is produced in the soil at the water's edge of the breeding pond platform, each leech can lay about 4 egg cocoons at a time, the egg cocoon can hatch after 16-25 days, and each cocoon can hatch 13-35 leeches.

Wild leeches: the growth cycle is about 3 years, the spawning period is mostly within 1 month after Qingming and autumn 8-9 months, the first time can lay 3-5 egg cocoons, each egg cocoon can hatch 13-25 leeches.

1. Leech growth cycle

1. Artificial breeding.

1) The growth cycle is about 1 and a half years, and the average weight of the individual is about 35-50 grams, and the larger ones can reach about 65 grams.

2) artificial breeding, every year from late May to late September for the leech spawning period, egg cocoons are produced in the soil at the water's edge of the breeding pond platform, oval type, each leech lays the number of egg cocoons each time is about 4, after 16-25 days can hatch out of leeches, each cocoon can hatch about 13-35 leeches.

3) The young leeches are brown in color, grow rapidly, and grow by more than 2 centimeters on average within 1 month after hatching. If there is abundant bait in the pond, the water quality environment is good, and the feeding density is appropriate, it can grow into an adult leech after 9-10 months.

2. Wild leeches.

1) The growth cycle is about 3 years, and the leech only begins to lay eggs when it reaches the age of 3 years, and the spawning period is mostly within 1 month after Qingming and August and September in autumn.

2) 3-5 egg cocoons can be laid for the first time, and each egg cocoon can hatch about 13-25 leeches.

3) After reaching the age of 4 years, 5-12 egg cocoons can be laid each time, and each egg cocoon can hatch about 15-35 leeches.

2. Growth conditions

1. Artificial breeding.

1) Adjust the temperature.

The water temperature during the breeding period should be about 25, and when the temperature exceeds 30, shade and cooling measures should be taken, and when the temperature is lower than 15, the film should be covered, and the sudden drop in temperature should be prevented at night.

(2) Control humidity.

The soil in the spawning grounds should be 30-40% humid to prevent it from being too dry or too wet.

The relative humidity in the air should be maintained at around 70.

(3) Change water and feed.

After entering the breeding period, the water quality should be kept fresh, so that the water quality can reach a certain degree of transparency, and the water should be changed frequently, or the water should be kept running slightly.

Leeches that enter the breeding period consume a lot of energy, and at this time they should be fed fresh, well-made, and sufficient bait, such as earthworms, snails, animal blood, etc.

2. Wild leeches.

1) It mainly lives in ditches, paddy fields, reservoirs, lakes and marshes and other waters, especially in ponds rich in organic matter and non-polluted small rivers.

2) The growth temperature is 10-40, when the northern region is lower than 3, the leech will burrow into the soil and enter the hibernation period, and will come out after the temperature exceeds 8 in March and April of the following year.

It mainly depends on the weather and temperature of the location, and the time of spawning. Generally, it can be listed in about four or five months.

Description of breeding technology:

1. Pay attention to escape. To build an escape wall around the perimeter of the pond, the height is more than 80-90 cm. The inside of the wall is plastered with cement and sand.

2. A large number of aquatic plants are stocked, mainly water hyacinth and duckweed. Leeches are afraid of direct sunlight, so a large number of aquatic plants can be used as fodder for snails, as well as shading, and leeches can also lay eggs on them.

3. Provide sufficient feed, and about 50 kg of snails should be put into every 667 square meters of water surface. In addition, leeches should be given livestock and poultry blood clots once a week, but the blood clots should not contain salt. In order not to affect the water quality, blood clots cannot be thrown directly into the water.

A blood clot can be placed on a wooden block to float on the water. Leeches can climb up to feed after smelling, and the blood clot should not be left for more than two days.

1. Leeches are hermaphroditic, allofertilized, and each mature leech has the ability to reproduce. Leech mating generally takes place in moist soils. Cocoons begin to lay eggs one month after mating.

From mid-May to early June, the average temperature is 19 24 C. Leeches hatch after 16-25 days after the egg cocoons are produced.

2. In the case of artificial breeding, the egg cocoons can be selected and placed in a suitable environment for centralized incubation. During the hatching period of the egg cocoon, try to avoid walking around on the platform to avoid stepping on the egg cocoon. The platform surface can be covered with a layer of aquatic weeds to keep it moist, and if it rains, the overflow should be dredged.

3. The water should not be covered by the platform, and a distance of 3-5 cm should be maintained. The young leeches mainly live on the yolk for 2-3 days after hatching, and feed after 3 days. The newly hatched young leeches mainly feed on the blood and sap (mucus) of mussels and snails

In the body of a mussel, more than a dozen young leeches will be drilled. As the larvae grow, they devour the entire soft body of mussels and snails.

Leech seedling breeding method:Breeding environment, seedling stocking, bait management, daily management.

1. Breeding environment

The breeding site of leeches should be established in an environment with good wind shelter and suitable light. In spring and autumn, the light needed for leech growth can be met, and then in winter, it can be done to protect against the cold. A suitable breeding environment is the key to the healthy growth of leeches.

When we establish a farm, we should not only build it reasonably according to the living habits of water quality, but also ensure that the water quality, temperature and humidity, light and other conditions are suitable, so as to create a good growth environment for leeches. It is also necessary to minimize costs, reduce costs, and improve the efficiency of breeding.

2. Seedlings are put in

If it is in the countryside, leech seedlings can be harvested from the wild. When breeding, we have to choose a good breed, and now the most common breeding species are mainly leeches. The growth ability of the leech is very strong, with a strong reproductive ability, and the yield is relatively stable.

The general breeding period of leeches is concentrated in June, so the stocking time of seedlings should be controlled in spring.

The spring environment is very suitable for the growth of leeches, with a suitable temperature, which is very helpful for the growth of leeches, and can usually be harvested and processed around October every year.

3. Bait management

The bait of leeches is mainly snail meat and plankton, and the flesh and internal organs of various animals are generally selected as bait for feeding. And with an appropriate amount of crop straw, it can be polycultured with some ordinary snails to provide natural bait for leeches. However, it is also necessary to pay attention to the number of snails, not to put too much, otherwise it will affect the growth of leeches, resulting in insufficient growth space for leeches and reducing their reproductive ability.

When feeding the bait, it is necessary to pay attention to the feeding frequency and remove the uneaten bait in time. Especially in summer, avoid high temperature and humidity that will cause the bait to deteriorate and pollute the water quality.

4. Daily management

The disease resistance of leeches is relatively strong, so our main management work in aquaculture is to regulate water quality. Although wild leeches do not have very strict requirements for water quality, if the water quality changes too much under artificial breeding, it will have a great impact on their growth and reproduction.

When breeding, the water temperature should be controlled at about 20-30 degrees, and a certain amount of dissolved oxygen should be ensured. If there is a lack of oxygen, it is necessary to inject water or increase oxygen in time. Especially in summer, because the temperature is high, the water quality is prone to deterioration, so be careful.

Leeches generally mate in March to April. Spawning occurs from April to May, and seedlings do not emerge until mid-May. (This is an approximate time, and the climate is different and the time is different across the country.)

When the temperature drops below 10 degrees, leeches begin to eat less and prepare for hibernation. Therefore, the growth period of the seedlings was only about five months. Leeches** are all processed dry products, and there is not much difference between dried leeches that grow for three months and dried leeches that grow for one year.

Therefore, the breeding is in the autumn, and it is generally not cultivated until the second year. In other words, leech farming is planted in spring and harvested in autumn.

The leech seedlings of that year can be kept as leeches for next year when they grow in autumn, and the seedlings of that year can lay eggs after a winter.

The growth cycle of leeches is one and a half years, the largest individual is 65 grams, the average is about 40 grams, and the lifespan is more than 5 years.

Leeches have a long growth cycle and slow reproduction, three-year-old leeches only begin to lay eggs, the first time to lay 3-5 eggs, 13-25 small leeches per egg, 5-12 eggs in four years, 15-35 eggs per egg. The spawning period is within one month after Qingming and in August and September in autumn.