Seedling stocking techniques of Freshwater Crayfish cultured in Paddy Field

There are many stocking methods for culturing freshwater crayfish in rice fields.

1. From June to early July after rice transplanting, when the seedlings turn green and split, the young shrimp will be put in, and the rice shrimp will grow together for a period of time. After the rice harvest, some of the substandard lobsters and selected parent shrimps will remain in the fields for cultivation until May to June of the next year. This kind of young shrimp stocking model is divided into two stages. The first paragraph is in July, August and September, and the latter is from October to May and June of the following year. In the first stage, in addition to part of the adult shrimp to be put on the market, the main purpose is to lay a good foundation for the latter stage of culture, ensuring that after rice harvest, there are 10-15 kg (1200-1500 shrimp) per mu of young shrimp and about 50 prawns per mu of parent shrimp, including more than 40 female shrimp. After raising the young shrimp and the propagated shrimp seedlings in Liutang for one winter and one spring, the yield can reach 120ml and 150kg.

2. After the middle of August, the parent shrimp and egg-holding shrimp were put into the circular ditch. After the rice harvest, the upper water of the rice field was 50ml / 60cm, and the fish was caught from May to June of the following year. This way of release, we need to pay attention to: 1, the amount of seed should not be too large, generally controlled at about 10 kg per mu, and the female-to-male ratio is 4 mures and 5 purls. With the passage of time, the female-to-male ratio gradually increases. In September, the female-to-male ratio can be increased according to 7-color-8. 1. Most of the parent prawns collected in early October are already in a state of waiting for production, but not male shrimp. 2. When purchasing parent shrimp, we must carefully select the parent shrimp with strong vitality and maturity and good head purple tail red. 3. Improving the survival rate of parent shrimp is the key to the seedling rate. Parent shrimp must be purchased nearby, considering the problem of inbreeding, female shrimp should be purchased at different locations.

3. Young shrimp were put into the annular ditch from April to May before rice planting, and there was relative isolation between the annular ditch and the paddy field. In the middle of June, the water level was increased to make the paddy field and the annular ditch integrated. Rotation fishing began in July, parent shrimp was selected after August 10, and Qingtang was caught after rice harvest. This method mainly means that all preparations have been done in winter and spring, and the transplanting of rice is mainly spring rice, which is usually finished around May 20. This method is not only beneficial to the high yield and efficiency of rice, but also beneficial to lobster culture. On this basis, we should pay attention to three points.

The first point is: to do a good job in the rice field culture project is the first condition for raising shrimp in the rice field. To carry out the transformation according to the requirements of the field engineering construction, the circular ditch in the field should be excavated 0.5-1 meters away from the ridge of the field, which is beneficial to the production of rice and shrimp and avoid collapse. the ditch is 2 meters wide and 0.8 meters deep. The seedling breeding ditch is 6 meters wide and 0.8 meters deep. There is a seedling collecting pond in the middle of the breeding ditch, which is 0.2 meters deeper than the breeding ditch, with a working ridge with a top width of 1 meter, so that the lobster can make holes and operate. When the field exceeds 15 mu, dig a + or # zigzag ditch in the field with a width of 1 meter and a depth of about 0.5 meters. When setting up the anti-escape net, two layers of anti-escape net are used, the first layer is close to the water edge to prevent the lobster from drilling holes, and the second layer is used to prevent the escape.

The second point is: timely pond clearance and immediate planting of aquatic plants are the key measures for shrimp culture in paddy fields. In lobster culture, it is emphasized that timely pond cleaning is an effective measure for shrimp culture, especially in the pond mouth of rice and shrimp continuous cultivation. Qingtang not only removes the wild fish, enemy organisms and some weeds that can not be used by lobster, but also the amount of lobster is effectively controlled. Pond cleaning drugs generally use quicklime, chlorine dioxide and so on. Pond cleaning time, first, after the rice harvest in October, this time to clear the circular ditch and the rice fields after harvest. The second is from May to June of the following year. This time, the main purpose of clearing the pond is to clean the annular ditch. Third, there should be one or two small clear ponds during the whole culture period (June, July-June and July of the following year), that is, the prepared parent shrimp breeding ditch should be properly cleaned at the beginning of August. and cleaning the annular ditch when roasting the field in the later stage of rice. The above ponds should be cleared by different methods and means according to different situations.

There are five kinds of aquatic plants suitable for planting in lobster ponds: verticillium verticillata, Eloe verticillata, water peanut, duckweed and water hyacinth. Among them, verticillium verticillata and Elodea verticillata are the main planting objects, water peanut and duckweed are the matching varieties, and water hyacinth can only be used as an auxiliary measure. For the recommended area, the coverage rate of aquatic plants in shrimp ponds should be controlled within 2 parts of the total area. During the breeding period, aquatic plants should be replenished when eaten by shrimp, and should be removed in time when there is too much. The cultivation method of Alternaria verticillata is basically the same as that of Elodea verticillata when planted in winter and spring, and water peanuts and duckweed can be harvested and transferred into shrimp ponds at any time.

The third point is that rational delivery and rotation is an effective means to increase the yield of shrimp raised in rice fields. The specifications of young shrimp released in June and early July are not necessarily the same. As long as they do not meet the market specifications, they can be put in. When rice is planted for 15-20 days, the amount of young shrimp will be about 30 kg per mu. The first time about 10 kg is observed for a few days and then the second batch is released. The source of young shrimp is best purchased on the spot and released as soon as possible, so as to shorten the collection and release time as far as possible, so as to improve the survival rate of young shrimp. When throwing young shrimp, it should be evenly distributed in the whole field, 1/3 into the circular ditch and 2/3 into the rice field. The lobster directly put into the rice field will not hurt the seedlings and affect the growth of rice. The water grass eaten by the lobster at this time is just a weed sprout that has just emerged in the rice field. Because the lobster has a strong region, uniform distribution can make effective use of the shallow water environment of the paddy field. Cultured lobsters must be caught and released in rotation immediately according to their growth. The young shrimp released in mid-June can start fishing in mid-July, and shrimp fry can be replenished appropriately according to the fishing situation.

First of all, thank you for your attention.

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