Three major successes of Macrobrachium rosenbergii breeding
2018-06-21 14:02:15
The first one is: to intensify the middle of the shrimp cultivation. The freshly-digested shrimp of the Roche shrimp only has a body length of only 0.8 cm. The ability to feed and adapt to the environment is poor. For instance, if directly put into an open-air shrimp pond, the survival rate is often very low; How to improve the survival rate and yield of Macrobrachium rosenbergii, and may be listed in advance, it is necessary to pay attention to the cultivation method of shrimp seedlings: 1 Fangmiao. After the pool water is filtered and sterilized, the water temperature is controlled at 23-25 ​​°C, the water depth is maintained between 0.8-1.0 meters, and 1000-2000 tails are released per square meter. 2 feeding. Adhere to a small number of times in order to reduce food waste and pollute pool water. Every morning, midday, and afternoon, each meal is fed once, and the amount of shrimp fed every day is 5%-10% of the body weight of the shrimp. 3 Set concealment. Put aquatic plants or laying nets in the cultivation pond to create a good environment for the inhabitants and clams of young shrimp. 4 water quality management. According to the water temperature and water quality of the pool, it is necessary to replace the new water regularly, inflate oxygen and change the water every 15 days. The water temperature is controlled at 25-27°C to keep the water fresh, the dissolved oxygen is sufficient, and the pH is 7-8. 5 out of the pool. In the middle of shrimp cultivation, the cultivation of water is small, the density is high, the water quality is difficult to control, and the clams of juvenile shrimps are frequent, and the phenomenon of mutual foodstuffs is serious. In the middle, the cultivation can generally be out of the pool for 15-20 days.
Tips 2: Control Shrimp Precociousness
Females with 5-6 cm in length are filled with eggs in the egg-bearing cavity. These shrimps stop vegetative growth and enter reproductive growth, which can seriously affect the quality of commercial shrimp. The main reasons are: 1 accumulated temperature is too high. As the aquaculture water body is small, the water level is shallow and the water temperature rises quickly, accelerating gonadal development. 2 Overnutrition. Some of the protein intake of Macrobrachium rosenbergii is converted into fat, which causes the body fat to increase rapidly within a short period of time, leading to precocious puberty.
Control methods: (1) Increase the water level of the culture pond appropriately, and change the water in the hot season to reduce the water temperature. 2 in the pond a variety of plants, reduce sunlight exposure, reduce the effective accumulated temperature. 3 appropriately control the amount of feed, with particular attention to control the amount of high protein feed.
Trick 3: Prevent larvae from killing each other
Macrobrachium rosenbergii has the behavior of killing each other during the breeding process, especially during the juvenile stage. Prevention methods: 1 Using waste fishing nets, cut into 2m square nets, and use fine bamboo baskets to vertically hold the nets in the pool. In this way, the space for climbing shrimp can be increased to achieve a three-dimensional utilization of the water body and relatively reduce the density of shrimp in a unit area. 2 Under the premise of maintaining certain dissolved oxygen, rational fertilization, and appropriately reduce the transparency of water. 3 Planting grass belt along the surface of the pool slope can serve as a hidden habitat for shrimp, providing abundant botanical bait for shrimp. 4 The bait requires complete nutrition and it is best to feed full-grain pellet feed. 5 Feed the bait evenly.
Tips 2: Control Shrimp Precociousness
Females with 5-6 cm in length are filled with eggs in the egg-bearing cavity. These shrimps stop vegetative growth and enter reproductive growth, which can seriously affect the quality of commercial shrimp. The main reasons are: 1 accumulated temperature is too high. As the aquaculture water body is small, the water level is shallow and the water temperature rises quickly, accelerating gonadal development. 2 Overnutrition. Some of the protein intake of Macrobrachium rosenbergii is converted into fat, which causes the body fat to increase rapidly within a short period of time, leading to precocious puberty.
Control methods: (1) Increase the water level of the culture pond appropriately, and change the water in the hot season to reduce the water temperature. 2 in the pond a variety of plants, reduce sunlight exposure, reduce the effective accumulated temperature. 3 appropriately control the amount of feed, with particular attention to control the amount of high protein feed.
Trick 3: Prevent larvae from killing each other
Macrobrachium rosenbergii has the behavior of killing each other during the breeding process, especially during the juvenile stage. Prevention methods: 1 Using waste fishing nets, cut into 2m square nets, and use fine bamboo baskets to vertically hold the nets in the pool. In this way, the space for climbing shrimp can be increased to achieve a three-dimensional utilization of the water body and relatively reduce the density of shrimp in a unit area. 2 Under the premise of maintaining certain dissolved oxygen, rational fertilization, and appropriately reduce the transparency of water. 3 Planting grass belt along the surface of the pool slope can serve as a hidden habitat for shrimp, providing abundant botanical bait for shrimp. 4 The bait requires complete nutrition and it is best to feed full-grain pellet feed. 5 Feed the bait evenly.
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