What are the matters needing attention for crayfish culture in rural fish ponds? Can I dig trenches?

More and more people are involved in crayfish culture, which is affected and restricted by some factors, which leads to the transformation of some fish ponds into crayfish culture ponds. Due to different farmed species, biological habits are different, the corresponding technical requirements are also different. So what are the matters needing attention for crayfish culture in rural fish ponds? Can I dig trenches?

Can crayfish culture in fish ponds dig trenches?

If you are considering long-term culture, it is best to dig trenches, and if you are short-term farming, you can not dig ditches; crayfish culture has certain requirements for ponds, years of culture, pond transformation, and gradually explore a fixed pond excavation method. Mastering the method of excavation will not only help to save the project cost, but also conducive to the culture and management of crayfish in the later stage and increase the output. The purpose of digging trenches: to increase the range of depth and depth, to increase the range of activities, to prevent escape, winter overwintering.

Second, how to dig the crayfish pond?

1. Upper east, lower west, aspect ratio

The trend of the crayfish pond, according to local conditions, it is best to choose the east-west direction, which is conducive to the daylighting of the crayfish pond and avoid the wind and waves. The width of the pond is maintained at 28-32 meters, the ratio of length to width is about 5:1, and the area is 5-6 mu. This width is a more suitable width in crayfish culture, which is convenient for daily feeding management, sprinkling drugs and so on. In the project, it is also the appropriate length of the arm length of the conventional excavator, left and right digging can do a good job of the pool ridge, no need for secondary excavation, no waste of labor.

2. the ridge is narrow, the slope is flat, and the depth is suitable

The width of the ridge in the pond should be kept at 0.8-1.0m, the slope ratio should be kept at 1:2-2.5m, and the depth of the pond should be kept at 1.5m-1.6m. Narrow noodles are conducive to saving land, crayfish pond 13 fragrant lobster wind and waves are small, pond ridge damage is small. The slope ratio should not be too large. When the water temperature is high in summer, the edge of the pool is too shallow, and the high water temperature affects the feeding of crayfish. The appropriate standard of the pool ridge can effectively save the development cost.

3. Bottom arc, middle groove, concave head

The bottom of the pool is curved, and the middle is deep and both sides are shallow. When excavating, the excavator only needs to dig 5-8 meters of soil in the middle of the pool, and the Radian of the bottom of the pool can be formed naturally. A 2 × 1 × 0.5 meter collecting tank is designed at one end of the pond drainage, which is beneficial to the water control at the bottom of the pond when drying the pond in spring.

4. keep more than enough water in and out of the water

When excavating the pond, we should consider the place near the drainage, leave room for the road in and out, and do not save the land excessively, without leaving enough distance in and out of the road, resulting in rework after the completion of the project.

Third, what are the points for attention of crayfish culture in rural fish ponds?

1. Desilting: especially in fish ponds with long culture years, the silt at the bottom of the pond is thicker due to the accumulation of culture years, bait residue, fish death and other factors, while the silt at the bottom of crayfish culture pond should not be too much and must be controlled below 10 cm. Therefore, for this part of the pond mouth, it is necessary to drain the pool water for dredging work.

2. Sun pond, sterilization and pond cleaning: thoroughly dry the fish pond where silt removal is completed or drain the pond water, until the soil at the bottom of the pond opens a crack; then a small amount of water source (about 5 cm) can be introduced and sprinkled with quicklime throughout the pond. Disinfection, sterilization and pond cleaning treatment, the amount of quicklime is 150-200 jin per mu. It is necessary to clear the fish ponds in order to kill the remaining fish eggs and other organisms and natural enemies that affect crayfish culture.

3. Pond ridge reinforcement and construction of anti-escape facilities: heighten and widen the ridge of the fish pond, keeping the height at 1.5 meters and the width of 3-4 meters; it is best to reconstruct and design the intake and drainage system and introduce a new inlet and drainage pipeline. Anti-escape nets are installed around the fish ponds to prevent farmed crayfish from escaping.

4. Aquatic plant planting: crayfish culture must plant aquatic plants. After about a week of sterilization and pond cleaning in the culture pond, the water source is reintroduced, and the water level is controlled at about 15 cm. Water plants are mainly Elorella, verticillata, bitter grass, etc., auxiliary water peanuts, water hyacinth, etc., the planting area is controlled at about 30% of the culture area.

5. Water quality regulation and seedling release: after the water plants are alive, the water level is gradually deepened, the water body is regulated according to water color and fertility, and the seedling release treatment is carried out after the water body is normal. Generally, shrimp is planted in June-August, and shrimp seedlings are released in September-October and March-April. Shrimp seedlings are about 40 jin per mu and 80 jin per mu.

After the completion of seedling delivery, timely bait feeding, water quality regulation, water level management and daily management, daily crayfish disease prevention, timely fishing and sale of crayfish when the specifications meet the requirements.