During the hot season, the weather is hot, the sunshine is strong, the temperature is high, and the water quality is poor, which affects the shrimp's foraging and molting, and it also easily causes death. According to the practice experience of 21 households such as Liang Chunlin and Zhai Youbin, who are located in the joint of the Yellow Sea and the Bohai Sea at Dalian Pulandian City, and do a good job in the management of shrimp feeding, it should do four things.
First, to implement water temperature control and oxygen increase 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 meters to 2 meters, and the high temperature period should be maintained more than 2.2 meters. . For this reason, in the tide period, it is necessary to maintain a daily change of water; in the low tide and dry season, mechanical irrigation and drainage should be conducted so that the amount of water exchanged can reach about 50%. In the high temperature period, the whole row should be fully filled, so that the water temperature can be effectively controlled below 30° C., so that the transparency of the water can reach 35 cm, and the dissolved oxygen level can be stabilized at about 5 mg/l, so as to facilitate fast food and high quality of the shrimp. When changing the water, it is best to prevent the intrusion of the fulminant virus of the shrimp. It is better to filter the water at the inlet with a 60-mesh membrane.
Second, to phase-feed the shrimp when the body length of 4 cm or more, to feed snails, oysters and other low-value shellfish bait-based, feed every day 10000 tail 6 kg ~ 8 kg; in shrimp 8 cm in length At the time of feeding, 50 kg per 10,000 pigs per day is provided; when the shrimp is 12 cm long, 100 kg per 10,000 pigs are fed daily. Such as small shellfish food is not enough, can be fed compound feed, when the shrimp body length of 4 cm or more, 1.5 kg per 10000 feeding per day, after the prawn body length every 0.5 cm increase, 10,000 per day increase of 0.3 kg ~ 0.5 Kilograms; When shrimps grow more than 10 centimeters in length, 0.7 kg to 0.8 kg will be added every 10,000 times. If chilled small fish are used, 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 feed must be placed on the platform around the shrimp pond so that all the shrimp can be eaten. When baiting, it is necessary to adhere to the principle of "Four more than four and more than two". "Four or more than four," that is, shrimp less before the growth of the early stage, more than the late vote; less vote in the morning, late in the evening to vote; less investment at low tide, when the tide more vote; shrimp a lot less when the skin cast, normal growth and more cast. "Two don't vote" means that the deteriorating food does not cast, and the ditch and deep water do not cast.
Third, we must guard against the occurrence of high-temperature shrimp disease season, shrimp feeding activity is poor, the body's metabolic levels decline, coupled with deterioration of the water environment, pathogenic organisms breed, easily lead to shrimp disease. Therefore, we must do a good job of prevention and control of shrimp disease. First and foremost, pay attention to the amount of feed should not be too much and too concentrated, so as not to change the quality of the food stink. In particular, live bait is highly susceptible to deterioration at high temperatures. To reduce water pollution in shrimp ponds, frequent water changes are required. Second, it is necessary to reasonably adjust the density of shrimps in order to maintain a certain active water area for shrimp.
Fourth, to prevent the floating head of prawns from dying during the high temperature season, they should adhere to the morning and evening patrol ponds daily to observe the growth activities of the shrimps and the surviving conditions of the bait, and to determine the type and quantity of bait to be baited that day. When prawns are heavily molted, some high-protein compound feeds should be added to prevent mutual food. Before midnight and before dawn, the oxygen in the shrimp pond is at its lowest point, which is the most dangerous time for the shrimp to suffer death from floating head, such as the discovery of prawns, white shrimp floating head, and the gathering of small trash fish to the pond edge (this is the symptom of shrimp floating). It is necessary to start the aerator or change the water in time.
First, to implement water temperature control and oxygen increase 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 meters to 2 meters, and the high temperature period should be maintained more than 2.2 meters. . For this reason, in the tide period, it is necessary to maintain a daily change of water; in the low tide and dry season, mechanical irrigation and drainage should be conducted so that the amount of water exchanged can reach about 50%. In the high temperature period, the whole row should be fully filled, so that the water temperature can be effectively controlled below 30° C., so that the transparency of the water can reach 35 cm, and the dissolved oxygen level can be stabilized at about 5 mg/l, so as to facilitate fast food and high quality of the shrimp. When changing the water, it is best to prevent the intrusion of the fulminant virus of the shrimp. It is better to filter the water at the inlet with a 60-mesh membrane.
Second, to phase-feed the shrimp when the body length of 4 cm or more, to feed snails, oysters and other low-value shellfish bait-based, feed every day 10000 tail 6 kg ~ 8 kg; in shrimp 8 cm in length At the time of feeding, 50 kg per 10,000 pigs per day is provided; when the shrimp is 12 cm long, 100 kg per 10,000 pigs are fed daily. Such as small shellfish food is not enough, can be fed compound feed, when the shrimp body length of 4 cm or more, 1.5 kg per 10000 feeding per day, after the prawn body length every 0.5 cm increase, 10,000 per day increase of 0.3 kg ~ 0.5 Kilograms; When shrimps grow more than 10 centimeters in length, 0.7 kg to 0.8 kg will be added every 10,000 times. If chilled small fish are used, 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 feed must be placed on the platform around the shrimp pond so that all the shrimp can be eaten. When baiting, it is necessary to adhere to the principle of "Four more than four and more than two". "Four or more than four," that is, shrimp less before the growth of the early stage, more than the late vote; less vote in the morning, late in the evening to vote; less investment at low tide, when the tide more vote; shrimp a lot less when the skin cast, normal growth and more cast. "Two don't vote" means that the deteriorating food does not cast, and the ditch and deep water do not cast.
Third, we must guard against the occurrence of high-temperature shrimp disease season, shrimp feeding activity is poor, the body's metabolic levels decline, coupled with deterioration of the water environment, pathogenic organisms breed, easily lead to shrimp disease. Therefore, we must do a good job of prevention and control of shrimp disease. First and foremost, pay attention to the amount of feed should not be too much and too concentrated, so as not to change the quality of the food stink. In particular, live bait is highly susceptible to deterioration at high temperatures. To reduce water pollution in shrimp ponds, frequent water changes are required. Second, it is necessary to reasonably adjust the density of shrimps in order to maintain a certain active water area for shrimp.
Fourth, to prevent the floating head of prawns from dying during the high temperature season, they should adhere to the morning and evening patrol ponds daily to observe the growth activities of the shrimps and the surviving conditions of the bait, and to determine the type and quantity of bait to be baited that day. When prawns are heavily molted, some high-protein compound feeds should be added to prevent mutual food. Before midnight and before dawn, the oxygen in the shrimp pond is at its lowest point, which is the most dangerous time for the shrimp to suffer death from floating head, such as the discovery of prawns, white shrimp floating head, and the gathering of small trash fish to the pond edge (this is the symptom of shrimp floating). It is necessary to start the aerator or change the water in time.
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