Five key points of Freshwater Crayfish Culture in Paddy Field after Winter

We all know that many creatures have the habit of hibernating in winter, just like us humans, there is much less activity in winter, so people's resistance is much weaker in winter, and lobster is also much less active in winter.

Five key points of Freshwater Crayfish Culture in Paddy Field after Winter

As the temperature drops, friends who raise crayfish in rice fields should pay attention to the following points in winter:

First, reinforcement: because shrimp seedlings have to dig holes everywhere after they come to the new environment, if the ridge of the field is too narrow, it is easy to be "holed through the wall" by lobsters, resulting in shrimp seedlings escaping and water leakage in paddy fields. When the water level drops, other lobsters have to dig holes again or run away. Second, make caves: hit some man-made caves in the mud with wooden sticks or shovels below 15 centimeters on both sides of the field. The cave angle should be small and be "parallel" to the field as far as possible. Once the lobster has a "ready-made" cave, it will not bother itself to save its physical energy and reduce the damage to the ridge of the field. Third, straw mulching: properly sprinkle some crop straw (such as rice straw) in the rice field, one is to keep warm, the other is to play the role of food, because straw straw rot is a good feed for lobster. Fourth, feeding: timely and appropriately add nutrition to the lobster, such as wheat bran, corncob, etc., mix the feed with water, knead it into a small ball and put it into the field, with nutrition, it is convenient for the lobster to grow and reproduce. 5. Water conservation: keep the water surface 20 cm above the field surface, sometimes high and sometimes low. Changes in the water surface can easily cause lobster to repeatedly drill holes, transfer holes, or consume physical energy, kill shrimp seedlings, or destroy ridges, and other adverse effects.

Matters needing attention in lobster culture

First of all, create a good environment for lobster growth. As the lobster loves to drill holes, the general depth of the cave is 50-80cm, and the depth of some caves is more than 1m. In order to avoid digging and escaping, the ridge width around the breeding water body should be more than 1.5m, and 0.5m high anti-escape net or smooth inner wall, anti-escape board should be set around the ridge, and the purse seine should also be buried 2m deep to prevent the lobster from escaping. At the same time, the river pond simulates the ecological environment of lobster under natural conditions, and 10% of aquatic plants and concealment are planted on the edge of the pond to create an environment for lobster habitat and shelling, and reduce the killing of each other.

Secondly, feed reasonably. Since lobsters kill each other when they are hungry and underfed, feeding must be adequate. And the lobster feed is animal and plant feed. The plant feed is wheat, water grass, rapeseed cake, etc., and the animal feed is miscellaneous fish, meat and animal viscera. Usually, the feeding time, feeding amount and feeding method are determined according to the habit of lobster in the day and night and the density of shrimp in the pond.

Finally, do a good job of scientific fishing. Under the condition of suitable temperature and adequate feed, the young shrimp can grow to the commercial specification in 90 days. The seedlings were released in March and the rotation began around June, selling big and keeping small.

Base Construction of Lobster Culture

1. The location of the lobster culture base must fully consider the surrounding environment, such as whether the water source is rich, the source of bait, transportation and the convenience of power supply, etc., among which the investigation of water quality is very important. The PH value of the water must be controlled at about 6-8.

2. The disinfection work of the lobster culture base can generally be carried out through quicklime and bleach powder. It is only necessary to break the quicklime and sprinkle it evenly into the pool water, and then stir the bottom of the pool with an iron rake the next day, so that lime and silt can be fully mixed. Of course, there are many specific disinfection methods, and farmers can choose by themselves.

3. The construction of lobster culture base needs professional technical personnel, and professional technical personnel are very important for lobster culture bases. for example, breeding pond preparation, parent shrimp selection, parent shrimp delivery, parent shrimp cultivation, water quality management, fertilization and incubation, shrimp seedling cultivation and so on all need scientific and reasonable technology to ensure the healthy growth of lobster.

Feed formula for lobster culture

The crude protein content of juvenile shrimp feed is 37.4%, and the ratio of various raw materials is as follows: Peruvian fish meal 20%, fermented blood meal 13%, bean cake 22%, cottonseed cake 15%, secondary meal 11%, corn meal 9.6%, bone meal 3%, yeast powder 2%, multivitamin premix 1.3%, ecdysone 0.1%, starch 3%.

The crude protein content of adult shrimp feed is 30.1%, and the ratio is as follows: Peruvian fish meal 5%, fermented blood meal 10%, bean cake 30%, cottonseed cake 10%, secondary powder 25%, corn meal 10%, bone meal 5%, yeast powder 2%. Multivitamin premix 1.3%, ecdysone 0.1%, starch 1.6%.

Among them, bean cake, cottonseed cake, secondary powder and corn were crushed again before premixing and dried for more than 2 days after granulation to prevent feed deterioration. Among the two feed formulations, 0.6% of the total aquatic feed adhesive was added to increase the water resistance time of the feed.

Although it is more troublesome to breed lobsters in winter, it is relatively easy to master certain techniques and methods. Breeders should breed lobsters reasonably according to changes in the weather.