Because of its rapid growth, low breeding cost, good marketability, and high economic efficiency, Haishu has become a hot spot for the development of aquaculture. However, due to the fact that the variety is subject to the limitation of aquaculture technology, the success rate of outdoor breeding is generally low, and the optimum temperature range for seagrass growth is 15°C to 30°C. Therefore, the breeding time is limited to the summer and autumn, and the supply is short. The price is too high. In view of this, using vegetable greenhouses to organically combine vegetable cultivation technology and jellyfish aquaculture technology to develop cultivation of sea bream in greenhouses, which can be produced throughout the year so that fresh oysters can be continuously sourced to the market, satisfying both demand and good economic benefits. Can kill two birds with one stone. The breeding techniques are summarized as follows:
First, choose a suitable plastic pond construction ponds, the entire modification caused by the length of the open, wide 20 meters to 40 meters, 1.2 meters to 1.8 meters in depth of the bar-shaped pond, leveling pool bottom, surrounded by a plastic film slope. On this basis, bamboo poles with a diameter of more than 10 cm are used as pillars with a spacing of 2 m to 2.5 m. Bamboo or bamboo is used as the top support. The spacing is 1.5 m to 2 m. The roof nodules are fixed, and the exterior is sealed with a droplet-type membrane, leaving the outlet and the damper at both ends, and the drainage system can be set well. Generally, the area of ​​each shed is 0.7 hectares to 7 hectares, which is not easy to manage and regulate. Do not leave dead corners around the shed so as to avoid confining the activities of the sea otters to death.
Second, seed breeding and delivery
1. There are three methods currently used for the seedlings' sources: one is to harvest natural seedlings at sea; the Other is to collect semi-artificial seedlings, that is, to recover the sea breams at sea at mature stage, and to obtain seedlings by artificially laying attachment bases; For raising seedlings, seagrass or artificially cultivated larvae are selected, and high-quality seedlings can be obtained through intensive cultivation and propagation. When seedlings grow to 1.5 cm or more, they can be used as seedlings.
2. The seedling seedling density is generally controlled at 5/m3 to 8/m3. Before the seedlings are raised, the rearing pond should be drained with water of 50 cm to 60 cm, fertilized and the basic bait should be bred to meet the feeding needs of the young quail. As a shed that is produced all year round, a breeding pool of monoptera, rotifer, and Artemia should be set up. Feeds for larval rearing should be graded and fed depending on the growth rate of the sea lice. When investing seedlings, attention should be paid to the indicators of physical and chemical factors such as water temperature, salinity, etc., in the rearing pool and rearing pond, and the difference between the two should be adjusted as small as possible to prevent the survival rate of the seedlings from falling due to the large difference.
Third, aquaculture management
1. Water quality regulation Yangyang first raise water. According to the practice, the fertilizer should be stable for 5 days to 7 days after the seedlings are released, and the water should be added again when the larvae gradually adapt. Water should be added less frequently, and each time water is added and the amount of water in the later period should not exceed 15% of the total body of water. When the amount of water is increased to the maximum, an appropriate amount of water should be changed so that the young can have a good growing environment. Before each addition of water, water temperature and salinity measurements should be made regularly to avoid excessive changes. In the winter and spring, due to the large temperature difference between the inside and outside of the shed, a small shed can be set up in front of the shed. When the temperature of the sun rises to a certain level, the water is added again. The best time to add water is 3 pm every day. ~ 4 o'clock.
2. Baits Feeding baits should be fresh, not deteriorating, and free from foreign pollutants and pathogenic sources. The number of feedings was 2 to 4 times a day, and the amount of feeding was determined depending on the growth of sea lice. In the middle and later stages of breeding, as the food intake of sea lice increases, wild rotifers or Artemia can be harvested to prevent the sea lice from becoming hungry and affecting their normal growth.
3. Daily management The growth of sea otters requires a good gas and water environment, so it should be noted that timely ventilation, especially in the late aquaculture, when the shed is relatively poor in the air flow and water flow, a small aerator should be set up for this situation. Fine tubes and aerobic stones are used for oxygenation. However, do not use larger impeller type or waterwheel type aerators. These two types of models are liable to cause damage to the sea lice due to their large blades. In the cold season, the roof should be covered with straw curtains for insulation; in the warm season, the plastic film on both sides of the greenhouse can be rolled up to make the ventilation smooth to reduce the temperature.
Fourth, harvesting sea otters grows quickly. Individuals up to 50 days old can reach 5 kg to 10 kg. At this time, they can be collected in batches, captured large and small, and listed one after another. There are many ways to harvest it. The general equipment is dip net or set net, and finally it can be harvested.
V. Benefit Analysis From the current consumer market and breeding trends, first, with the increasing shortage of natural resources in Haishu, their prices have remained high. In 2002, Fresh Taro sold for 12 yuan to 16 yuan per kilogram, finished products sold at 60 yuan or more, and the supply was in short supply, and the market was in short supply. Second, in the case of low efficiency of other farming methods, the cultivation of sea otters in greenhouses can be described as one of the best, raising six quail all year round. The net profit per shed of hectare is generally more than 30,000 yuan. From this we can see that the development of plastic sheds for the breeding of sea bream has broad prospects and is very promising.
First, choose a suitable plastic pond construction ponds, the entire modification caused by the length of the open, wide 20 meters to 40 meters, 1.2 meters to 1.8 meters in depth of the bar-shaped pond, leveling pool bottom, surrounded by a plastic film slope. On this basis, bamboo poles with a diameter of more than 10 cm are used as pillars with a spacing of 2 m to 2.5 m. Bamboo or bamboo is used as the top support. The spacing is 1.5 m to 2 m. The roof nodules are fixed, and the exterior is sealed with a droplet-type membrane, leaving the outlet and the damper at both ends, and the drainage system can be set well. Generally, the area of ​​each shed is 0.7 hectares to 7 hectares, which is not easy to manage and regulate. Do not leave dead corners around the shed so as to avoid confining the activities of the sea otters to death.
Second, seed breeding and delivery
1. There are three methods currently used for the seedlings' sources: one is to harvest natural seedlings at sea; the Other is to collect semi-artificial seedlings, that is, to recover the sea breams at sea at mature stage, and to obtain seedlings by artificially laying attachment bases; For raising seedlings, seagrass or artificially cultivated larvae are selected, and high-quality seedlings can be obtained through intensive cultivation and propagation. When seedlings grow to 1.5 cm or more, they can be used as seedlings.
2. The seedling seedling density is generally controlled at 5/m3 to 8/m3. Before the seedlings are raised, the rearing pond should be drained with water of 50 cm to 60 cm, fertilized and the basic bait should be bred to meet the feeding needs of the young quail. As a shed that is produced all year round, a breeding pool of monoptera, rotifer, and Artemia should be set up. Feeds for larval rearing should be graded and fed depending on the growth rate of the sea lice. When investing seedlings, attention should be paid to the indicators of physical and chemical factors such as water temperature, salinity, etc., in the rearing pool and rearing pond, and the difference between the two should be adjusted as small as possible to prevent the survival rate of the seedlings from falling due to the large difference.
Third, aquaculture management
1. Water quality regulation Yangyang first raise water. According to the practice, the fertilizer should be stable for 5 days to 7 days after the seedlings are released, and the water should be added again when the larvae gradually adapt. Water should be added less frequently, and each time water is added and the amount of water in the later period should not exceed 15% of the total body of water. When the amount of water is increased to the maximum, an appropriate amount of water should be changed so that the young can have a good growing environment. Before each addition of water, water temperature and salinity measurements should be made regularly to avoid excessive changes. In the winter and spring, due to the large temperature difference between the inside and outside of the shed, a small shed can be set up in front of the shed. When the temperature of the sun rises to a certain level, the water is added again. The best time to add water is 3 pm every day. ~ 4 o'clock.
2. Baits Feeding baits should be fresh, not deteriorating, and free from foreign pollutants and pathogenic sources. The number of feedings was 2 to 4 times a day, and the amount of feeding was determined depending on the growth of sea lice. In the middle and later stages of breeding, as the food intake of sea lice increases, wild rotifers or Artemia can be harvested to prevent the sea lice from becoming hungry and affecting their normal growth.
3. Daily management The growth of sea otters requires a good gas and water environment, so it should be noted that timely ventilation, especially in the late aquaculture, when the shed is relatively poor in the air flow and water flow, a small aerator should be set up for this situation. Fine tubes and aerobic stones are used for oxygenation. However, do not use larger impeller type or waterwheel type aerators. These two types of models are liable to cause damage to the sea lice due to their large blades. In the cold season, the roof should be covered with straw curtains for insulation; in the warm season, the plastic film on both sides of the greenhouse can be rolled up to make the ventilation smooth to reduce the temperature.
Fourth, harvesting sea otters grows quickly. Individuals up to 50 days old can reach 5 kg to 10 kg. At this time, they can be collected in batches, captured large and small, and listed one after another. There are many ways to harvest it. The general equipment is dip net or set net, and finally it can be harvested.
V. Benefit Analysis From the current consumer market and breeding trends, first, with the increasing shortage of natural resources in Haishu, their prices have remained high. In 2002, Fresh Taro sold for 12 yuan to 16 yuan per kilogram, finished products sold at 60 yuan or more, and the supply was in short supply, and the market was in short supply. Second, in the case of low efficiency of other farming methods, the cultivation of sea otters in greenhouses can be described as one of the best, raising six quail all year round. The net profit per shed of hectare is generally more than 30,000 yuan. From this we can see that the development of plastic sheds for the breeding of sea bream has broad prospects and is very promising.
Rich Farmer International Trade Co., Ltd. , http://www.jnfreshfruit.com