First, build the pool and the training pool?
It is advisable to choose a place where the water source is sufficient, drainage and irrigation are convenient, and the location is located south to the south. The pool is 10 to 30 meters long, 1 to 1.2 meters wide, and 0.2 to 0.25 meters deep. The bottom of the pool is preferably covered with a layer of slate or marked with "triple soil", requiring a 0.5% to 1% drop in Dianchi Lake, with a gutter and mouth at the upper end and a gutter and mouth at the lower end. Metal grills are installed at the inlet and outlet to prevent fish, shrimp, snails and other predators from entering the pool with water. Note that Dianchi Lake should have a certain length, otherwise the feed and fertilizer put in will be easily taken away by the water flow. If it is impossible to build a long strip, it can be constructed into a circulation-shaped pool or a meander-shaped pool.
The quality of the medium is the key to shortening the harvest period of leeches and achieving high yields. The raw materials for the cultivation period may be organic-rich sludge (such as fish pond silt, rice paddy sludge, black mud near the sewage ditch, etc.), loosening agent (such as bagasse, etc.) and organic manure (such as cow dung, chicken dung, etc.) ) Three types of substances. The filling procedure is: first deposit a layer of bagasse or other loosening agent at the bottom of the pool, the amount of which is 2 to 3 kg per square meter, and then spread a layer of sludge to a total thickness of 10 to 12 cm, submerge the base surface with water, Soak 2 to 3 days after the application of cattle, chickens, pig manure, about 10 kg per square meter. After the seeds are planted, apply a layer of sludge with a thickness of 3 to 5 centimeters to the surface and mix a layer of fermented bran with rice bran, corn flour, etc. on the surface. Sprinkle 150-150 square centimeters per square meter. 250 grams. Finally add water so that there is a 3 to 5 cm deep layer of water on the surface of the medium. At this time, we can introduce leeches. Production practice has proved that the new pond culture medium can generally be used continuously for 2 to 3 years, and should be updated when it is out of date. ?
Second, introduced and inoculated?
In mid-to late September, when the temperature drops to about 28°C, it can be introduced into the pool. There are no shortages of water leeches in various places, such as sewage drains and harbor wharfs in the outskirts of cities and towns, waste pits in livestock breeding farms and slaughterhouses, and sewage pits in tanneries, sugar mills, food factories, etc., natural waters. The maggots are relatively rich and can be seeded nearby. Seed hoppers can be transported along with sludge and waste as they contain a large amount of lice eggs. The inoculation work is relatively simple, that is to say, the collected pods are evenly spread on the surface of the culture medium in Dianchi Lake. Per square meter of culture area to 500 to 750 grams of pods is appropriate.
Third, feed and feeding?
Minks particularly like to eat sweet and sour food feeds, livestock manure, domestic sewage, agricultural and sideline products processed waste is also their high-quality feed. However, the feed (especially manure) should be fully decomposed and fermented, otherwise they will be fermented in the Dianchi Lake to produce high fever "burned" quail eggs and larvae. Manure can be naturally decomposed naturally in potholes, food feeds are fermented with water for 16 to 20 hours before feeding, and are seasoned at a room temperature of 20°C or more. The amount of water added is hand-kneaded into a group and dropped. , and then shovel piles, beat strong, cover with plastic cloth. If the room temperature is below 20°C, add yeast tablets to promote the fermentation. The dosage is about 1 piece per 1 to 2 kg dry feed. The materials are mixed at 3 to 4 o'clock in the morning. The next morning can be matured. Uncovering the plastic fabric has a strong sweet and sour taste that proves that you can feed it.
In order for the otters to reproduce quickly and produce high yields, they must be fed regularly. After inoculation until every 10 to 15 days before harvesting, 200-250 kg of mature manure should be applied per acre; from the beginning of harvest, 300 kg of manure should be topdressed after each harvest, and appropriate amount of food feed should be used to promote water. It is fast and fast. When feeding fertilizer, dilute with water and stir to remove debris such as grass residue, and then evenly spilled on the surface of the culture medium, do not sprinkle in a lump in the pool. Do not forget to close the inlet before feeding so as to avoid loss of feed flow. ?
Fourth, Dianchi Lake and water pipes?
This is an absolutely indispensable part of feeding and management. The method is to use the "T" shaped raft to carefully shake the medium of Dianchi Lake once and consciously put moss and weeds into the mud. The role of Dianchi Lake is to prevent the growth of the culture medium. The second is to remove the metabolic wastes from the leeches and harmful gases produced by the decomposition of the feed (fertilizer). The third is to effectively suppress the growth of moss, duckweed, and weeds. Fourth, the surface of the culture medium can always be kept flat, which is conducive to smooth and smooth water flow. Depth regulation is appropriate at 3 to 5 cm. In sunny weather in early spring, the water in the pool can be shallow during the day to increase the temperature of the pool by using solar energy and deepen at night to facilitate thermal insulation and antifreeze. In the middle of the summer, the pool water should be deeper to reduce the light irradiation. It is better to pre-date the pond. Empty scaffolding for growing vine crops. Too much water flow will not only take away nutrients and eggs on the surface of the culture medium, but also exacerbate the physical energy consumption of the water fleas, which will be detrimental to yield increase. However, too small flow rates and even long-term hydrostatic conditions are not conducive to the supply of dissolved oxygen and the elimination of harmful substances such as metabolic waste, resulting in deterioration of water quality and massive carcass death. Practice has shown that a flow of 0.005 to 0.01 cubic meters (5 to 10 kilograms) per second per mu of culture pond is sufficient. Mink is very sensitive to pesticides and other harmful substances in water. Industrial waste water, field water that has just been sprayed with pesticides, or medicine-containing water for treating fish diseases cannot be used.
V. Harvesting and purification?
The otters are highly capable of reproduction, and hatching pups can grow eggs more than 20 days after they grow. Each pod can produce eggs and eggs from several to several tens of eggs, and can produce 100 to 4 million eggs in one lifetime. The newly established Dianchi Lake will enter the peak of breeding after 30 days of inoculation, and it will remain prosperous forever. However, the life span of the otters is not long, generally only about 80 days, and a few can live up to 120 days. Therefore, it is one of the key measures to obtain high yields. The harvesting method can be used to cut off the water the night before or reduce the flow of water, resulting in lack of oxygen in the Dianchi Lake. The next morning, it is very easy to use a small dip net made of polyethylene mesh cloth to pick up the water. Each time the carcass was harvested, the "pigment group" on the surface of the culture medium was taken as the standard. This type of harvesting does not affect the reproductive performance of the group, nor does it lead to a reduction in yield due to the aging of the carcass without timely harvesting. ?
In order to purify the blisters, we can pour a bucket of buns into a square filter cloth and wash it in water to remove most of the sand. Then pour it into a large pot to make it not more than 10 centimeters thick. Put a piece on the surface. Rib gauze, flooded 1.5 to 2 cm deep, tightly covered with a lid, closed for about 2 hours (when the temperature exceeds 28°C, the sealing time must be shortened, otherwise it will suffocate water), the leeches will be drilled from the eyes of gauze . When the lid is lifted and the four corners of the gauze are lifted, pure water blisters separated from the dregs can be obtained. This method can be repeated 1 or 2 times, and the leeches in the residue can be extracted again. The remainder of the pelvic floor contains a large amount of eggs and a few carcasses and should be poured back into the culture pond.
Six, temporary support and Sinotrans?
If the day cannot be used up or sold out, it should be raised. Moisturizing 10 to 20 kilograms per square meter of pool surface, stirring and dispersing once every 3 to 4 hours, to prevent the death of the integrative group. When long-distance transportation is needed, the transit time should be over 3 hours or less. Apply a double-layer plastic film oxygen bag. Each bag should not exceed 10 kilograms, add 2 to 3 kilograms of clean water, and be rich in oxygen. Add appropriate ice cubes to ensure safe transport to your destination. ?
New Agricultural Development Department, Fulong Township, Zhongjiang District, Neijiang, China, 641101
In recent years, with the rapid development of the famous aquatic products aquaculture industry, the leech bait has become more and more popular among farmers. Therefore, it is very promising to actively develop cultured leech. Aquatic ponds can be raised and cultivated in fields, with the highest yield in ponds, with an annual output of 750 to 1,000 kilograms per mu. According to the current market price of 20 yuan per kilogram, the output value can reach 1.5 to 20,000 yuan, and a net profit of 0.8 to 1,000 can be obtained. 1.2 million. The artificial breeding techniques of Minamata are now described as follows: