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How to raise prawn in midsummer high temperature season
In the summer high temperature season, the weather is hot, the light is strong, the water temperature is high, and the water quality is poor. This can affect the feed for shrimp and the growth of molting, and it is also easy to cause death. Must do the following management: First, the implementation of water temperature control oxygen. With the increase of water temperature and the growth of shrimp, it is necessary to continuously increase the water depth, especially in the middle and later stages of aquaculture, the water level must be increased to 1.8 to 2 meters, and the high temperature period should be maintained at 2.2 meters or more. For this reason, during the tidal period, it is necessary to drain water once a day; during low and dry periods, mechanical irrigation and drainage is required to change the amount of water per day to about 50%. During the high temperature period, the whole row is fully filled, so that the water temperature can be effectively controlled within 30°C, the transparency of the water can reach 35 cm, and the dissolved oxygen level can be stabilized at about 5 mg/l, which is good for the fast food, high quality and high yield of shrimp. However, when changing the water, it is necessary to prevent the intrusion of tiny live organisms carrying the shrimp outbreak epidemic virus. It is better to use a 60-mesh membrane filter at the inlet. Second, staged scientific feeding. When shrimps are 4 cm or more in length, they are mainly fed with low-value shellfish such as snails, feeding 6 to 8 kg per 10,000 pigs per day; when they are 8 cm in length, they are fed 50 kg per 10,000 pigs per day. When the body length is more than 12 cm, feed 100 kg per 10,000 tails per day. Such as small shellfish food is not enough, can be fed formula feed. For a body length of 4 cm or more, 1.5 kg per 10,000 animals will be fed every day. After each 0.5 cm increase in body length, 0.3-0.5 kg per 10,000 animals will be added every day; when the body length is longer than 10 cm, an increase of 0.7 ～ 0.8 kg. If chilled small fish are used, then substitute 1 kg of compound feed with 2.5 kg of chilled fish. Prawns have nocturnal habits, frequent activities at night, strong appetite, and latent days, reduced appetite. Therefore, bait should be fed twice before sunrise and after sunset, with 1/3 in the morning and 2/3 in the evening. The bait should be put on the platform around the shrimp pond so that the shrimp with strong constitution can eat it. When sticking, stick to “Four or more than fourâ€, that is, cast less in the early period and more in the later period; cast less in the morning and cast more in the evening; cast less at low tide, and cast more at the tidal times; cast. "Two not cast", that is, change the bait does not cast, ditch and deep water do not vote. This can effectively improve the utilization of feed. Third, beware of shrimp disease hazards. In the summer high temperature season, the shrimps have poor feeding ability, the body's metabolic levels decline, and the deterioration of the water environment, pathogenic organisms breed, can easily cause shrimp disease. To this end, first of all, pay attention to the amount of bait should not be too much and too concentrated, so as not to change the smell of food odor, resulting in water pollution. In particular, fresh live baits are highly susceptible to deterioration in hot weather, resulting in the death of shrimp poisoning. To reduce water pollution in shrimp ponds, frequent water changes are required. Second, pay attention to grooming. In the high summer season in midsummer, it is necessary to reasonably adjust the density of shrimps to keep the shrimps active. Fourth, prevent the death of prawn floating head. Before midnight and before dawn, due to the oxygen in the pool water reaching the lowest point, it is a dangerous time for the shrimp to be the most vulnerable to the death of floating heads. For example, the oyster shrimp, white shrimp floating heads, and small trash fish gathering to the pond edge are collected. Signs must be promptly activated aerator or constantly changing water, in order to increase the dissolved oxygen in shrimp pond water. It is necessary to pay attention to the removal of debris from the shrimp ponds to ensure that the water quality is good and fresh, so as to prevent the death of the floating head of the shrimp.