Crayfish culture skills: how to prevent crayfish from escaping, killing each other and seedling death?

In recent years, due to the hot crayfish market, strong disease resistance, fast growth, strong fecundity and adaptability, natural overwintering and high survival rate of live transportation, many people are eager to try crayfish culture. However, in the process of crayfish culture, there are still many points for attention, so how to prevent crayfish from escaping, killing each other and seedling death?

First, how to prevent crayfish from escaping?

1. Persist in pond inspection

A patrol is conducted every morning and evening to check the feeding and activity of shrimp, the water quality and whether the pond is leaking, and to remove the moss in the pond in time; always check the filter screen of the inlet and drain to prevent the escape of lobster or the entry of wild miscellaneous fish due to the broken filter; pay attention to whether there are any enemy pests in the pond, such as water rats, water snakes, water birds, frogs and fish, if so, they should be removed in time.

2. Observe the changes of water quality

Strictly prevent the water quality from being polluted by industry and agriculture; when the dissolved oxygen in the water is low, the water quality is aging, or encounter muggy, continuous overcast and rain and other bad weather, the amount of bait should be reduced or stopped; if the lobster is found to be slow to respond, gather to the shore, floating head and climb to the shore, it is necessary to timely inject water or turn on the aeration machine; often add new water to keep the pond water clean; regularly disinfect shrimp ponds with quicklime.

3. Take measures to prevent escape.

Lobster ponds should use materials such as plastic film or calcium plastic board to build an anti-escape wall with high 50cm. Especially in the flood season and typhoon season, it is necessary to do a good job in flood control and strictly prevent strong winds and heavy rains from destroying the ridges of the fields or causing escape by flooding.

4. Strengthen molting management.

During the molting period, the unified molting of lobster should be promoted by feeding, changing water and other measures. When a large number of lobsters molt, should reduce bait, reduce human interference, all operations should be careful to create a quiet and good environment to promote lobster molting smoothly. After a large number of lobsters molt, they should be fed high-quality bait in time to prevent each other from killing each other due to lack of bait. At the same time, 10-15% of aquatic plants and shelter are planted on the shallow side of the pool to create an environment for lobster habitat and shelling, which can also reduce the killing of each other.

5. Strictly prevent lobster from burrowing

Lobsters have the habit of digging holes, which are usually less than one meter deep, destroying the ridges of the fields, which gives many farmers a headache. The following measures can be taken:

(1) laying a layer of dense plastic mesh on the slope of the pool ridge to protect the slope and prevent holes.

(2) planting more aquatic plants in the pond, not too concentrated and sporadically distributed, and set up a certain number of nets, or set up artificial caves such as bamboo tubes and plastic tubes, so as to increase the shelter of lobster habitat and molting, so as to reduce lobster burrowing.

Second, how to prevent crayfish from killing each other?

1. Pay attention to the culture density

In high-density culture, the discharge of concealed objects should be increased and artificial caves should be established. Farmers in crayfish culture in order to pursue higher profits, often high-density culture, when the crayfish culture density is too high, they must put aquatic plants into the water, on the one hand, it can increase concealment and prevent crayfish from killing.

2. Give enough feed

Crayfish are omnivorous animals, plant food and animal food can be eaten. Crayfish are more gluttonous, and crayfish often kill when there is not enough bait. Therefore, in the process of breeding, we must ensure that the bait of crayfish is adequate. In addition, crayfish are diurnal and nocturnal animals, which often come out at night to move and feed. Therefore, in the process of feeding, we should pay attention to the reasonable amount of feeding in the morning and evening. Usually the amount of feed at night should be about 60% of the total daily feed.

3. Maintain water quality

Many farmers mistakenly believe that natural crayfish often live in smelly ditches, ponds and other places. It has strong ability to resist pollution and can survive under poor water quality conditions. In fact, crayfish also have certain requirements for water quality, and poor water quality conditions will lead to crayfish slaughter.

4. Unified crayfish culture specifications

In the process of breeding, some farmers do not pay special attention to the specifications of crayfish. When lobster seedlings are released, the specifications of crayfish vary from large to small, which is very disadvantageous to culture, because the killing phenomenon of crayfish is very obvious. There is often the phenomenon of big shrimp eating small shrimp.

Third, how to prevent seedling death from breeding crayfish?

1. Select good seedlings

Enter the seedling supply site and observe for one or two days to see if there are dead shrimps in the pond, whether the seedlings have been sick, and whether the vitality is strong. All these must be understood when deciding to get into each other's seedlings. Crayfish seedlings come from a wide range of sources, which can be divided into four types: self-breeding, self-fishing, field seedling purchase and domestic seedling purchase. Large-scale farming is mostly purchased from home-raised seedlings, and the former three are mainly small-scale farming. Self-propagating autotrophic seedlings are the best, domestic seedlings are the second, self-catching seedlings are the second, and field seedlings are the worst.

2. Standardize the operation

Its own pool environment operates strictly according to the process. Remove wild miscellaneous fish 15 days before stocking, kill insects in the first 5 days, fertilize water in the first 4 days, sterilize and change the bottom in the first 3 days, detoxify and test the water in the first 2 days. Non-toxic and harmless before release is the key to ensure the survival rate of healthy shrimp seedlings in the pond.

When transporting seedlings, first spread a layer of water grass at the bottom of the frame, the thickness of shrimp seedlings is not more than 5 cm, and arrive at the seedling ground before 4 o'clock in the morning. It is the key to choose sunny weather to get seedlings. It is not recommended to do so on cloudy days, but against rainy days. When releasing the seedlings, soak in medicine for 3-5 minutes.

Put the seedling frame together with the shrimp seedlings into the water for 2 minutes, put them on the water surface for 2 minutes, so circulate for two to three times, put the seedlings into the water and drag the water around the pond and pour it. Part of the shallow water area in the pond can also be distributed, and stacking and dumping in one place is strictly prohibited. At the same time, in the seedling release area, the granular oxygenator was directly sprinkled in the seedling area, and vitamin C glucose drugs were sprinkled.

After releasing the seedlings, the next day, sprinkle vitamin C glucose drugs, and try to throw feed. On the fourth day, supplement calcium and magnesium once. No shelling was seen on the fifth day, and calcium and magnesium were replenished again.