1 It is the primary condition for healthy breeding of Macrobrachium praecox to cultivate healthy seedlings with good seedlings. The following points should be noted in the breeding of Macrobrachium rosenbergii.
1.1 Use 7 to 10 cm healthy Macrobrachium rosenbergii as a parent. In winter, pay attention to the operation and do not touch the shrimp body.
1.2 The seedling time is controlled for 26-28 days, the water temperature is about 28°C, and the desalination time is 2-3 days. The water temperature is gradually reduced to 22-25°C before emergence.
1.3 To increase the middle of the seedling cultivation process, about 0.7 cm of desalinated seedlings will be incubated in a special pool (early seedlings will be cultivated in a greenhouse), and cultivated into 1.5-2.5 cm large-size shrimp seedlings.
2 Disinfection of good clear pond
2.1 After the clear pond in winter, the pond will be drained, the water in the pond will be drained, the bottom silt will be removed, and the pool will be kept below 10 cm. If the conditions are suitable, the bottom mud shall be plowed and the water-free drying pond shall be maintained.
2.2 Disinfection before stocking In the week before stocking, use a tea bream, croton, bleaching powder, quicklime, etc., and disinfect with 10-15 kg of tea bream per 667 square meters, 0.5 kg of salt and 0.5 kg of quicklime. One week later, the water was poured in and the seedlings were released one week later. Clear pond drugs are best to use tea pots, because tea pots do not kill aquatic plants, and can be fertilizer and water, have a long effect; and can promote shrimp shelling.
3 Keep the transparency of the water quality at 40 cm or so. Regularly change the water. When the water quality is too rich, increase the number of water changes. When the water quality is lean, apply fertilizer in appropriate amounts. In general, 20 kg/667 square meters of lime are used every 20 days. The whole pool is splashed to keep the pH at 7.8, and the dissolved oxygen is kept above 5 mg/L.
4 Feeding a good feed According to the living habits of Macrobrachium rosenbergii, the feed is fed on the shore of the sea, which is about 1 meter along the coast. Generally, they are fed twice a day, once at around 8 a.m., accounting for 30%, and once a day at 8 a.m., accounting for 70%. During the high season (mid-and late-stage), 3 times were fed, with 20%, 10%, and 70% each in the morning, middle, and evening. In the morning, pellet feeds were used as the main ingredient, and pellet feed and fresh feed were fed at night. Feeding amount is basically 1-2 hours for bait, and it is best to take 2-4 food sets in the pool in order to check the eating situation. If there are not many feeding places, the feed will be unsuitable, and it will cause feed wastage and pollution. Water quality. For this reason, the feeding bait should be promptly removed, and the feeding point should be disinfected.
5 Creating a good ecological environment According to the inhabiting characteristics of Macrobrachium rosenbergii, planting aquatic plants and setting up concealed objects can reduce the direct contact between the macrobrachium and the mutual residual food. Concealed species can inhabit Macrobrachium, purify water quality, increase dissolved oxygen in water, reduce direct sunlight, and lower water temperature. Planting water plants is to create a biological community of floating plants and submerged plants in the shrimp ponds. Floating plants are preferred for leeks and water peanuts, forming bundles on the water surface 1.5 to 3.5 meters from the shore, accounting for about 20%; water peanuts The cultivation is relatively simple. The leek is raised in the dry land in mid-March and the water is transplanted in early May. Submerged aquatic plants such as Vallisneria alternifolia, Hydrilla verticillata and Elodea spp. are preferred. The growth rate of such plants is faster. Especially in the middle and late breeding period, the quantity and area are not easy to control. When over-breeding, the water quality is lean and the transparency is great. Macrobrachium inhabits during the day and consumes a large amount of oxygen at night, which can easily cause floating heads and bring certain difficulties to fishing. It has a certain impact on feeding and therefore must control its quantity.
6 Put a good scientific drug application based on past epidemic situation of shrimp disease, and do prevention work in advance. Once the disease occurs, it must be correctly diagnosed. When using the drug, grasp the drug concentration and interval time; when the same type of shrimp disease relapses, use different drugs; maximize drug efficacy, avoid drug abuse, and use the wrong drug. The use of highly toxic drugs is strictly prohibited.
Healthy breeding technology of Macrobrachium rosenbergii
The healthy breeding of Macrobrachium rosenbergii is based on the growth, reproduction, activity patterns and ecological requirements of Macrobrachium rosenbergii, selecting a scientific breeding model, adopting a system of standardized management techniques and creating a good ecological environment to enable its healthy and rapid growth. Its breeding technology should mainly grasp the following aspects.
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