Aquaculture technology
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1. Build medium. The raw materials for the medium may be organic-rich sludge (such as fish pond silt, paddy field slime, 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. A layer of bagasse or other loosening agent is laid on the bottom of the pool, and the amount is 2 to 3 kg per square meter. Immediately lay a layer of sludge to a total thickness of 10 to 12 cm/m2, submerge the base surface with water, soak cattle, chicken, and pig manure for 2 to 3 days. About 10 kg/m2; before inoculation Apply a layer of sludge with a thickness of 3 to 5 centimeters, and apply a layer of fermented bran, rice bran, corn flour, etc. on the surface of the mixture to spread 150 to 250 grams per square meter; add water to make the culture. There are 3 to 5 centimeters deep water layer on the base surface, the new pond culture medium can generally be used continuously for 2 to 3 years, then it should be updated. 2. Introduction and inoculation. Every autumn, when the temperature drops to about 28°C, it can be introduced into the pool. The source of leeches is abundant in the sewage sewers, livestock and poultry farms and slaughterhouses, sugar factories, and sewage effluents from food factories in the outskirts of cities and towns. 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. The cultivation area per square meter is preferably 500-750 g. 3. Feed and feed. Minks particularly like to eat sweet food feeds, livestock and poultry 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 pond to produce high fever “burnt†quail species and pups. Manure can be naturally decomposed naturally in the pit box, and the grain feed is fermented with water for 16 to 20 hours before feeding. The mixture is mixed at room temperature of 20°C or more, and water is added to the mixture by hand to form a mass. Then shovel the piles, tap and sturdy, and cover with plastic sheeting. If the room temperature is below 20°C, yeast tablets should be added to promote fermentation. The dosage is about 1 piece per 1 to 2 kg of dry feed, and it is mixed at 15 to 16 o'clock in the morning, and it can be matured in the morning of the second day. Uncovering a strong, savory scent of plastic cloth proves that it can be fed. From 10 to 15 days after inoculation, every 10 to 15 days before harvest, 200 to 250 kilograms of manure was applied at a rate of 667 square meters. Since the start of harvest, about 300 kilograms of manure could be topped up after each harvest, and the amount of grain feed was appropriate. In order to promote the rapid development of leeches fast. When feeding fertilizer, dilute it with water and stir to remove debris such as grass residue. Sprinkle evenly on the surface of the culture medium. Do not scatter and accumulate in the pond. Do not forget to close the inlet before feeding to avoid feed. Drift is lost. 4. Dianchi 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, and consciously dig moss and weeds into the pond. The role of Dianchi Lake is to prevent the growth of the culture medium; the second is to remove the metabolic waste generated from the leech and the harmful gases produced by the decomposition of the feed (fertilizer); and third, to effectively suppress the growth of moss, duckweed, and weeds. Fourthly, it can always keep the surface of the culture medium 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 pool temperature by using solar energy, and deepen at night to keep warm and prevent freezing. During the high temperature period in midsummer, the pool water should be deeper, so as to reduce the sunlight radiation, it is better to build plants in the sky above the pond. Vine crop shading. Too much water will not only take away the nutrients and bacteria on the surface of the culture medium, but also exacerbate the physical energy consumption of the water fleas, which will be detrimental to the increase of production. However, the excessively small flow rate and even the long-term hydrostatic state will not be conducive to the supply of dissolved oxygen. Exclusion of harmful substances such as metabolic wastes, resulting in deterioration of water quality and massive carcass death. 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. 5. Harvest and purification. The ability of leeches to reproduce is extremely strong. After the new pond has been vaccinated for 30 days, it will enter the peak of reproduction, 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, timely collection is one of the key measures to achieve high yields. The method of harvesting was to cut off water or reduce the flow of water the night before, resulting in lack of oxygen in Dianchi Lake. On the second day, it was very easy to use a small dip net made of polyethylene mesh cloth to pick up the earthworms in the water. Each time the carcass was harvested, the "fishy group" on the surface of the culture medium was taken as the standard. This will not affect the reproductive performance of the group, and it will not reduce the 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 cm thick. Spread a ribbed gauze on the surface. Flooded 1.5 to 2 cm deep, covered with a tight lid, sealed about 2 hours later (when the temperature exceeds 28 °C, the sealed room must be shortened, otherwise it will be boring dead water), the water blister will be drilled from the eyes of gauze, exposing Open the lid of the pot and lift the four corners of the gauze to obtain a clean blister completely separated from the residue. This method can be repeated 1 or 2 times. The leeches in the dregs will be raised again. The residue left on the pelvic floor contains a large amount of eggs and a few carcasses and should be poured back into the aquaculture pond. 6. Holding and shipping. If the day cannot be used up or sold out, it should be raised. Per square meter of surface area of ​​water larvae 10 to 20 kilograms, every 3 to 4 hours regularly stirring dispersed once to prevent the death of the integration group hypoxia. When long-distance transportation is needed, the transit time is more than 3 hours. Apply double-layer plastic film oxygen bags. Each bag must contain no more than 10 kilograms of water, add 2 to 3 kilograms of fresh water, and have enough oxygen. When the temperature is high, the bag must be added. Appropriate amount of ice to ensure safe delivery to your destination.