Management techniques of cultivating Monopterus Albus in cement Pond

Construction technology of yellow eel pond

The eel pond can be made of brick and stone, and the walls, bottom and corners of the pool are sewn with cement mortar or triple soil color, and where there is much lime, the pool is also built with triple soil. At present, there are three common eel ponds.

① self-flow water exchange eel pond: its characteristic is that the bottom of the eel pond with a depth of 80 cm is higher than the drainage ditch, the pond is rectangular, and the area is 3X 4 or 3X 5.

② habitat and feeding pool: it is characterized by the separation of habitat and feeding.

③ urinal: in some places, the wall foundation of the eel pool is a little deeper, and the bottom of the pool can not be paved with bricks or stones, which can reduce the cost of building the pool.

No matter what kind of eel pond, there should be an inlet, a drainage culvert and an overflow. The intake had better be connected with a flume to let the water fall into the pool from the trough, so that when injecting water, on the one hand, it can be aerated to increase oxygen. On the other hand, it can prevent the rice field eel from escaping along the water mouth, open a drainage culvert in the opposite pond of the water inlet, and open an overflow outlet on the pool surface, and each water outlet should be installed with fish blocking facilities. In the pond, 1/3 water surface can also be used to cultivate aquatic plants such as water floating lotus, water husk and green duckweed, and pumpkins can be planted beside the pond to create good ecological conditions for the growth of eels. The eel pond is disinfected with quicklime before stocking. Generally, the eel seedlings can not be released until about half a month after disinfection after draining water per mu with quicklime. Family breeding of ricefield eel can also be converted into eel ponds by using sporadic water surfaces such as small ponds at the front and back of the house. The area can be large or small, but there must be a source of water so that it can be artificially added or changed in case of drought. The pool depth is 0. 7m / m. To build a new fish pond, it is best to choose a clean place that is sheltered from the wind and the sun, close to the house and near the water source, with an area of about 2mur10 square meters, with the best 4Mel 5 square meters. No matter what kind of fish pond, it must be watertight.

2. Feeding and management techniques.

① water source sufficient water quality is good: ricefield eel growth requires water fertilizer, clean, deep oxygen enough, ricefield eel is like shallow water and temperature-loving animals, so in the early spring season, the water level should be controlled at about 6 cm, in order to facilitate the water temperature rise. There is a lot of mucus on the surface of Monopterus Albus. If the storage density is high, and the water is not changed in time, the mucus will accumulate more and more. When this mucus is decomposed, it consumes a large amount of dissolved oxygen and produces heat, which increases the water temperature significantly, resulting in the death of Huang Qi. Therefore, it is necessary to do a good job of changing water in order to keep the water quality fresh, improve the appetite of ricefield eel and strengthen the conversion of bait. Water exchange is an effective way to remove pond dirt, increase dissolved oxygen and keep water quality fresh. Bait should not be too much, too much will rot and stink, so that the water quality will become bad, generally 1 to 2 days after bait need to be filled with new water once. Maintain a water depth of 10 to 15 centimeters during the growing period, and adjust the water depth according to weather changes.

② pay attention to the change of water temperature: before and after the Qingming Festival, when the water temperature is generally stable above 10 ℃, you can begin to do preparatory work. First of all, the environment around the culture pond is cleaned, and then drug disinfection is carried out. The method is to make 50 g / L saturated lime solution with quicklime, filter out the clear solution, add 10 g / L caustic soda to stir well to make a strong alkali disinfectant, and then spray and disinfect the perimeter of the culture pond with this solution. Finally, remove the overwintering cover on the surface of the eel pond and immediately spray disinfectant on the mud surface and the inner wall of the pond. After completing the above work, check the overwintering condition of Monopterus Albus and whether the facilities of the eel pond are in good condition. At the same time, the mud ridges in the pond should also be trimmed and planted with aquatic plants such as mushrooms, water chestnuts, taro and so on. The temperature in spring is low, and sometimes there is a "spring cold" phenomenon. Therefore, we must do a good job of heat preservation. At first, we can temporarily borrow the plastic film for overwintering, uncover the film at noon without wind and sunshine for a few hours, cover the film for heat preservation in the afternoon, and use electric lights or other heating facilities if possible. In addition to planting aquatic plants in the pool in summer, you can also plant some melons and beans on the edge of the pool and build a shed for shade. Low temperature in winter, to prevent cold, drain water, cover a layer of straw, keep the pool temperature and soil moist. Prevent eels from freezing to death, but do not walk or pile heavy objects at will in the pond, so as not to press the pores under the field, resulting in blockage of ventilation holes and asphyxiation of ricefield eels.

③ strengthen patrol observation: always pay attention to observe the changes of water quality, water temperature and pool water depth, and strengthen care when it thunder and heavy rain to prevent floods from destroying the pool or eel turning over the pool.

④ anti-virus and anti-harm: to prevent toxic substances from entering the eel pond, geese and ducks should not be released in the pond, so as not to swallow young eels and reduce income.

⑤ properly maintain the depth of the water layer: in general, it is appropriate to deepen the water level at a depth of 15 cm in general and deepen the water level appropriately in the hot season, but not more than 20 cm. Because Monopterus Albus is sensitive to the temperature difference in water, once the temperature difference in water is more than 3 ℃, Monopterus Albus may catch cold and gradually die. Therefore, when changing water, we should change the same temperature water as far as possible, the general measure is to build an additional reservoir, and then change the water after exposure. The times of changing water should be controlled flexibly according to the stocking density, feeding condition and air temperature of Monopterus Albus, and the best time is noon on a sunny day. There is no need to change water when the temperature is low. When the temperature rises to 15 ℃, the water can be changed once a week, each time accounting for 1 ℃ of the total water volume; when the temperature rises to about 20 ppm, the water can be changed every 5 days, and the water that can be changed every time should be filled with fresh water frequently, with a specific interval of seven days in spring and autumn and one in three days in summer. The frequency of changing water also depends on the source of water, the amount of ricefield eel, and the water quality. After the beginning of winter, drain the pool water and keep the soil moist. And cover the pond soil with a layer of 6-8 inches of straw or other weeds to prevent the pool water from freezing, because there is no water in the pool, especially to prevent cats, dogs and rats from entering the pond and swallowing eels.