CATDOLL : CATDOLL: What are the key management points for raising crayfish when the temperature is low?

Compared with previous years, the price of crayfish is low this year, and the market has been falling. The benefits of many pond farming have been affected, and only by increasing production can the income be stabilized. The way to increase the production of crayfish is first to know how to protect the seedlings, that is, how to do a good job of wintering management.

1. Stabilize water quality and ensure survival rate

Crayfish are benthic animals and have the habit of digging holes to reproduce. After the shrimp fry hatch and leave the mother's body, the size is small, 0.5-0.8cm/tail, and it takes 5-8 molts to grow to 3-5cm. Therefore, the shrimp fry will be damaged during the first five molts, and some of them will die in the bottom mud, which is extremely difficult to be detected, so it is crucial to do a good job of seedling protection and management.

1. Deepen the water level For ponds with high hole openings, that is, the hole openings are close to the edge of the pond bank, when there are more shrimps with eggs, increase the water depth in time to submerge the shrimp holes to promote the shrimps with eggs and shrimp fry to leave the holes. At the same time, deep water bodies are more stable, and "Fertilizer Peptide III" is used regularly every 7-10 days to fertilize the water and inhibit the growth of moss.

2. Detoxify in time. The molting of crayfish is a rapid process of absorbing water and swelling. The more toxic the pond is, the more toxins it absorbs each time it molts, which can lead to crayfish poisoning, inability to molt normally, and even death from soft shells.

3. Ensure dissolved oxygen During the molting period, the shrimp fry are weak and easily damaged if the dissolved oxygen is insufficient. Therefore, molting damage can often be seen on rainy days.

2. Strengthen feeding to ensure adequate nutrition

The growth of shrimp fry is inseparable from the intake of nutrition, so feeding management at this time is crucial. Shrimp fry are small in size, and the palatability of bait is the key. They mainly feed on bioflocs, phytoplankton, powder, etc., so feeding also mainly starts from these aspects.

1. Artificial feeding: Feed with vegetable cakes or powder, and increase or decrease the feeding amount according to the feeding situation of the crayfish. You can use "Li Miao Duo" to ferment before feeding. For every 5 jin of "Li Miao Duo", 5 jin of vegetable cakes are highly attractive and more conducive to the absorption of crayfish.

2. Natural bait The natural bait for shrimp fry is mainly rotifers, supplemented by cladocerans and copepods. Rotifers are small and highly palatable, making them the first choice for shrimp fry, but they are also easily filtered by other zooplankton. It is recommended to stir the bottom mud in advance to stimulate the germination of dormant rotifer eggs; when a large number of carnivorous rotifers appear in the water, use "Li Miao Duo" + "Fei Shui Peptide III" regularly every 7-10 days to cultivate rotifers and fertilize the water to ensure the number of rotifers and provide sufficient nutrition for the growth of shrimp fry.

In low temperature seasons, crayfish are prone to frostbite and white spots on their muscles, so preparations for cold weather should be made in advance. When the water temperature is -10℃, the pool water should be added as soon as possible, and some feed and straw can be added to increase the physical fitness of the crayfish, increase the water temperature, and change the water temperature to prevent the crayfish from frostbite. Regular inspections should be carried out, and countermeasures should be taken as soon as possible when abnormalities are found to increase the survival rate of crayfish in the caves where they spend the winter, and ensure the economic benefits of breeding crayfish. It is necessary to prevent wind and snow, keep warm and increase oxygen, and strengthen the management of water quality. Do not rely solely on water changes to manage water quality, do not add feed arbitrarily, and take comprehensive measures to manage water quality. "

When breeding crayfish at low temperatures, you should pay attention to the demand for feed, because crayfish have high requirements for temperature, water level, oxygen content in the water and feed. You can use greenhouses and off-seasonal breeding. When breeding, you must pay attention to the changes in water levels and oxygen content in the water in the greenhouse.

(1) Ensure the quality of feed. In winter, overwintering shrimps are relatively weak. Usually, you can feed them with compound feeds with high protein content (such as crab feed and rock feed), and appropriately match them with some fresh fish and wild fish to increase the fullness and survival rate of the parent shrimps and meet the growth needs of the young shrimps. (2) The feeding amount should be appropriate. The water temperature is relatively low in winter, and the crayfish eat less. The feeding amount should be moderate. Since the number of shrimps in the pond is difficult to estimate, you can feed them roughly according to the weather conditions. Feed more on sunny days and less on rainy days. The feeding amount should be controlled within 2 hours. At the same time, add some corn for the young shrimps to eat. Feed twice a day, once in the morning and once in the evening.