1. Pond conditions:
The shrimp pond should be built in a place with sufficient water, the water depth is 1- 1.5m, the bottom is flat, the seepage prevention is good, it is rectangular, and it runs east-west, preferably1-3mu. Ponds should be equipped with electricity, access and oxygen-increasing equipment, as well as water intake and drainage systems. The water inlet is 60 meshes and the water outlet is 40 meshes. A double-layer filter screen (or a single-layer filter screen with 80 meshes in the water inlet and 60 meshes in the water outlet) should be set to prevent miscellaneous fish or fish eggs from entering the culture pond.
2. Wash the pond thoroughly with quicklime or bleaching powder.
Kill loach, miscellaneous fish, frogs, etc. Before the shrimps are released. 3-5 days before stocking, inject 30-50 cm of water, and apply 700- 1000 kg of cow, sheep and horse manure per mu to cultivate feed organisms.
3. Shrimp fry should be stocked at the end of April or May.
When the water temperature is stable above 20℃, the stocked shrimp seedlings should be healthy, disease-free and tidy. Generally, the stocking density of 2-3cm young shrimp is 30,000-50,000 per mu. After feeding for 4-5 months, the average body length can reach 9- 10cm and the weight is 20-30g, that is, about 40 animals per kilogram.
4. Feed feeding and culture of Macrobrachium rosenbergii.
Mainly use the compound pellet feed processed and produced by feed factory, and properly mix with some fish and shellfish feed. Macrobrachium rosenbergii has different nutritional requirements for food quality at different growth stages. The specifications and nutrients of feed should be adjusted according to the growth of Macrobrachium rosenbergii. The daily feeding amount is generally 5%- 15% of the total weight of shrimp in the pond, and it gradually decreases with the increase of shrimp weight. We should adhere to regular, quantitative and qualitative feeding, sprinkle water evenly around the pond, and increase or decrease flexibly according to the weather, shrimp feeding and activities.
5. Water quality
The management of Macrobrachium rosenbergii requires high water quality, so it is necessary to strengthen water quality control. The water level of shrimp kept at 40-60cm after one month, and then the water level gradually deepened, reaching the deepest in August-September. When injecting water, it should be strictly filtered with nylon mesh bags to prevent enemies and pests from entering the pool. In summer, you can change the water twice a week, each time 15-20cm, and install an aerator to adjust the water quality. Generally, the water in the pool is light green and oily green. If the water quality is uncomfortable, change the water in time.
6. Region
Macrobrachium rosenbergii can't overwinter normally in the middle and lower reaches of the market and Huaihe River basin. In June+10/October, 65438, before the water temperature dropped to 16℃, the pool water was completely drained. Macrobrachium rosenbergii can be listed when the specification reaches 20g. Give priority to pulling nets, catch the big ones and leave the small ones, put them on the market in batches as soon as possible, reduce the shrimp load in the pond, ensure the rapid growth of shrimp and reach the market specifications as soon as possible.
What should I do if there is moss in the crayfish pond?
1. Wash with plant ash. Plant ash contains alkaline substances. If sprinkled on the moss-covered part of the pond, the moss will soon wither and rot.
2. Remove it manually. This is the fastest way to deal with moss, which is harmless to lobsters, but it takes time and effort.
3. You can also draw some water from the pond and let the moss bask in the sun.
4. Remove with quicklime. The principle of removing quicklime is the same as that of plant ash. Because it contains alkaline substances, it can quickly remove moss.
5. Change the water frequently after moss treatment, and don't let the moss grow too frequently.
6. Don't fertilize too often, too often will make moss grow wildly. At the same time, pay attention to strengthen the management of the pond.