Misgurnus anguillicaudatus is not easy to die in soilless culture The detailed explanation is as follows:

The advantage of loach soilless culture is that loach fish live in fine sand, and the fishing efficiency is high when sold, and the taste is better than that of loach culture, and the culture density is four times higher than that of loach culture. In a pool made of concrete, loaches hatched in spring can grow to 15~ 16 cm in a year. Let's talk about the soilless culture technology of loach.

Get ready.

1. Design of aquaculture ponds and fish nests

The culture pond is an idle cement pond structure turtle culture pond. The specifications of the culture pond are15m long,10m wide and1.0m deep. Before breeding, the water inlet and outlet were simply improved. Move the water inlet above the pond wall, and connect a PVC plastic pipe with a diameter of 6 ~ 7 cm at the water inlet, so that the water inlet pipe extends to the middle of the culture pond about 40 cm. At the same time, a net cover was installed on the bottom drain to prevent the loach from escaping.

Discarded bicycle tires are used as artificial fish nests. The collected waste bicycle tires were washed, soaked in 30 ~ 40mg/L potassium permanganate solution for disinfection, and placed at the bottom of the pool at an angle of 20 ~ 30 degrees, with a density of 5 tires /m2. Waste bicycle tires are used as fish nests, which have strong flexibility and good shading performance. Although light, it can naturally sink into the water and provide a hidden habitat for loach, making it an ideal artificial fish nest. 2. The source and stocking of loach.

(1) loach seedling raising and stocking

One day before 10 seedling stocking, add 30 cm of water and 20 kg of quicklime to make slurry, and immediately spray water evenly on the whole pond for disinfection. After 3 days, base fertilizer and water are applied to cultivate plankton in the pond water, so that loach can eat some natural bait organisms after being planted in the pond.

The stocking time of seedlings is1May 7. When the seedlings are released, the temporary wild loach seedlings is finally selected. The operation method is as follows: 4% saline solution is prepared in a larger container, and wild loach seedlings is soaked in saline water for 4-5 minutes. Loach seedlings, who is injured, will jump violently, and loach seedlings, who is in poor health, will be in a coma and weak. In order to eliminate this individual, loach seedlings, which are usually active in salt water, will be stocked and salt leaching method will be adopted.

(2) Source

Misgurnus anguillicaudatus fry were purchased from March to May, 2009. When buying wild loach seedlings, try to choose artificial trapping seedlings with neat specifications, strong and lively, no disease, no injury and no deformity, and the best body color is orange or cyan. The selection method of wild seedlings is as follows: put loach seedlings into a plastic basin, add half a basin of water, and paddle spirally in a certain direction by hand to form a vortex. Loach seedlings, which is in poor health, is in the middle of the whirlpool, while loach seedlings, which is in good health, has strong water resistance. At the edge of the basin, remove the loach seedlings in the middle and leave the loach seedlings on the edge as a seedling. The seedling size is 6- 10g/ tail and the length is 5-8cm.

Delicate water hyacinth flowers in loach culture pond

A, porous wood block or concrete block and porous plastic foam have the same size, thickness and spacing, but they are laid in water after overlapping and discharged from bottom to top.

B, water quality Because loach soilless culture is in the water during the whole growth period, it is required that the water quality is fat and fresh, without peculiar smell and color. Summer is the peak season and the temperature is high, so fresh water should be replenished frequently. It would be better if there were little water flowing continuously.

C, put aquatic plants (water hyacinth, etc. ) in a hidden pond, floating on the water, shielding the loach from the sun. In hot summer, it can not only absorb the direct irradiation of strong ultraviolet rays on loach, but also adjust the water temperature; The developed roots of aquatic plants not only provide a good habitat for loach, but also purify the water quality and improve the overall ecological environment of loach breeding ponds. The coverage area of aquatic plants accounts for about two-thirds of the water surface.

Therefore, aquatic plants can be directly put into water for soilless culture of loach, especially for large-scale culture. The production process of loach is easy to manage, easy to operate and properly managed. The growth rate and survival rate of loach will be greatly improved.

Soilless healthy culture technology of loach

1, hole block or concrete block

The size, thickness and spacing are the same as those of porous plastic foam, but they are discharged in water after overlapping and from bottom to top.

2. Porous plastic foam

Drill a hole with a diameter of about 2 cm every 5~7 cm. The size of each piece of plastic foam is uncertain, and the suitable thickness is 15~20 cm, which is stacked to form a three-dimensional fixation. Let it float below the water, not above it.

3. The grass is hidden

Aquatic plants (water hyacinth, etc.) ) into the pool, floating on the water to provide shade for loach. In hot summer, it can not only absorb the direct irradiation of strong ultraviolet rays on loach, but also adjust the water temperature. The developed roots of aquatic plants not only provide a good habitat for loach, but also purify the water quality and improve the overall ecological environment of aquaculture ponds. The coverage area of aquatic plants accounts for about two-thirds of the water surface.

Zenggu Primary School of Hunan Agricultural College has done a model test of setting hidden objects in loach feeding pond, and put 15~20 cm soil, multi-layer wooden frame, aquatic plant hidden objects and no hidden objects in the feeding container. The results showed that different hidden conditions obviously affected the survival rate and growth rate of loach. Among them, aquatic plants are the best: the highest survival rate is 1.07 times that of soil, 1. 14 times that of multi-layer wooden frame and 1.46 times that of non-concealed materials; The maximum weight gain multiple of aquatic plants is also the highest, which is 1. 10 times for soil, 1.37 times for multi-layer wooden frame and 1.42 times for uncovered plants. The highest yield of aquatic plants is still the highest, which is 1.33 times that of soil and 1.45 times that of multi-layer wooden frame.

Soilless culture of loach can directly put aquatic plants in water, especially in large-scale culture. The production process of loach is easy to manage and operate, and the growth rate and survival rate of loach will be greatly improved.

4. Support management

No matter what kind of soilless culture method, its management should pay attention to the following matters. (1) Water quality Because the soilless loach is in the water during the whole growth period, it is required that the water quality be fat and fresh, with no peculiar smell and different colors. In summer, the growing season is high and the temperature is high, so it is better to add fresh water frequently, if there is micro water flowing continuously. (2) Feed Fertilization The types, quantities and methods of feed fertilization can be found in the daily management of adult loach.