The jellyfish have a large food intake. Even if some biological foods are inoculated, they are in short supply. This results in low survival rates and small individuals, which directly affect the yield and benefits. This article mainly from the perspective of artificial cultivation of biological feed, to adopt a three-pool integration that is two pools of shrimp farming a pool of sea bream approach, the use of shrimp ponds to cultivate a large number of plankton, through the drainage into the jellyfish culture pond, to achieve ecological balance, supply and demand balance, so that sea otters In a more abundant environment.
1. Selection and construction of ponds Cultured sea otters should be selected in ponds that are convenient for entering and discharging water. There is no industrial pollution in the nearby waters, and freshwater resources are required to regulate salinity. The area of ​​ponds should not be too large, generally 0.67 to 1.33 square hectares, with a pool length-to-width ratio of 4:1, a water depth of 2 m, and a pH value of 7.5 to 8.5. In order to balance the supply and demand of jellyfish bait, three pools are integrated, which means that one pond is used for breeding jellyfish, and the other two ponds are used for raising shrimp. There is a gate between the pool and the pool at the other end of the intake. A fence of 40 to 60 mesh is set in front of the gate, and the water from the two shrimp ponds is drained from the middle of the pond.
2, pond finishing and water intake
2.1 For ponds that have been farmed for many years, it is necessary to carry out dredging treatment, thoroughly remove the organic matter spoilage and spikes at the bottom of the pool, and open the flooding gate to rinse repeatedly.
2.2 Select a sunny day Use quicklime and other drugs to remove predators and pathogens.
2.3 When entering the water, a screen mesh of 40-60 mesh should be set at the inlet to prevent entry of predator organisms. The water intake time should be chosen from February to March, because this time the influent organisms are less harmful, which is conducive to the pond's food culture. Do not start too deep into the water, 30 ~ 40cm is appropriate.
2.4 Choose to breed fertility organisms at noon on a sunny day. Fertilize chicken manure in combination with inorganic fertilizer. When fertilizing, chicken manure should be diluted with water to spread evenly throughout the pool. Blocked chicken manure sinks into the bottom and is easily corrupted. According to the color decision.
2.5 Monitor and record the influent water quality. The monitoring contents include pH value, water temperature, salinity and quantification of plankton. When entering the water from the middle of the shrimp pond into the jellyfish aquaculture pond. The production process is: water supply → fertilization → propagation of phytoplankton → inoculation of zooplankton → sea bream.
2.6 Inoculation When the amount of phytoplankton in the pond reaches a certain density: the transparency is about 30cm, and when the water temperature is stable at about 18-20°C, rotifers and Artemia are inoculated. It is best to inoculate larvae that have just emerged at the time of inoculation. The inoculation density is From 2000 to 1000/m3, hatching eggs can also be used to hatch directly in the pool. Before inoculation, the hatching rate of dormant eggs and the number of eggs per gram should be determined to determine a reasonable inoculum size.
3, put the seedlings
3.1 Use 2cm or more high quality seedlings. Injured seedlings cannot be used.
3.2 The time for planting should be from June to July. Select the weather without wind and put it in the pool in the morning or evening. Water temperature is about 20°C.
3.3 The density of seedlings shall be determined according to the specific conditions of each pond, and the reasonable amount of seedlings shall be determined. The conditions for changing the water in the ponds may be better. It is advisable to store 4500 to 7500 eggs per square hectare of water, and the density is high. The jellyfish grow slowly and It is prone to lack of oxygen in the late culture period.
3.4 The seedlings should be transported with a smooth internal wall. Long-distance transport should be carried out by means of oxygenation, shading, and ice in plastic bags to prevent temperature rise.
3.5 When investing seedlings, attention should be paid to the indicators of physical and chemical factors such as water temperature and salinity in nursery ponds and growing ponds, and the gap between them should be adjusted as small as possible. In the upper hand of the pond, the boat was transported to the middle of the pool with a boat and evenly spread in the pool. Be careful when handling it. Do not injure the seedling.
4. The management work during the cultivation of sea bream during the development period is mainly to do a good job of regulating the water quality and doing a good job in water quality monitoring. Its main content is:
4.1 After the seedlings are stable for one week, wait until the young cubs gradually adapt to the environment and slowly add water. The water should be added within 10% to avoid excessive changes in the physical and chemical factors caused by large amounts of water.
4.2 Pay attention to the changes of water color, timely and appropriate fertilization to continue culturing phytoplankton. Under normal circumstances, the water color is dark brown and brownish green. If the water color is lightened, it indicates that the number of the monocytic algae in the water is reduced. At this time, some soymilk and soybeans should be fed. Such as bacon powder, 2 g/m3 2 times a day, to prevent the whole algae plankton to eat. Conditional can be re-inoculated and fertilized.
4.3 Before changing the water, monitor the water quality outside the pool, mainly for the measurement of water temperature, salinity, and biomass. If the indicators are different, you can't change the water. The variation of salinity difference can't be more than 5‰.
4.4 In the late growing season, the food intake of the jellyfish began to increase, and the biomass in the pool was insufficient. At this time, he began to take advantage of the integration of the three pools. Take a large drainage in the sea pond, and then enter the water from the adjacent pool gate. Before the gate, a fence net is added. The mesh is 40 to 60 mesh. Small nauplii and copepods enter the jellyfish rearing pool and Artemia adults continue to grow in the original pool.
4.5 Always pay attention to fresh water supplement. Use water lifting equipment to continuously add fresh water. Be careful not to cause local salinity to be too low when adding water. Pump fresh water in the fence first, and spread it slowly to the surrounding area.
4.6 The depth of water in the early period is maintained at about 1m. With the increase of individuals, the water level gradually increases to 1.5-2m, and the water temperature is stable at 20-28°C.
4.7 Regular observations of sea lice feeding conditions. The foods used for feeding are planktonic live foods. After the sea bream feeds, the transparent body of the medium glue layer can see the color of the feeding food in the central part. If it is transparent, the food in the pool is insufficient.
5. The growth rate of harvested sea bream is very fast. After 60 to 80 days of cultivation, individuals can reach 5 to 10 kg or more. When the water temperature drops below 18°C, the growth rate slows down, and at 15°C it basically stops feeding. At this time, it is necessary to collect in batches, capture large and small, and continue to be listed. The harvesting method can be diversified and fixed. Finally, you can take a drainage harvest method.
6. It is suggested that the key to the cultivation of jellyfish is to obtain a large amount of plankton. Therefore, it is particularly important to do a good job of water quality regulation and artificial cultivation of biological food. The so-called cultivation period management, in the final analysis, is to increase the cultivation of biomass through the monitoring of plankton biomass. In order to maintain a pool of jellyfish, the key is to maintain a pool of water.
1. Selection and construction of ponds Cultured sea otters should be selected in ponds that are convenient for entering and discharging water. There is no industrial pollution in the nearby waters, and freshwater resources are required to regulate salinity. The area of ​​ponds should not be too large, generally 0.67 to 1.33 square hectares, with a pool length-to-width ratio of 4:1, a water depth of 2 m, and a pH value of 7.5 to 8.5. In order to balance the supply and demand of jellyfish bait, three pools are integrated, which means that one pond is used for breeding jellyfish, and the other two ponds are used for raising shrimp. There is a gate between the pool and the pool at the other end of the intake. A fence of 40 to 60 mesh is set in front of the gate, and the water from the two shrimp ponds is drained from the middle of the pond.
2, pond finishing and water intake
2.1 For ponds that have been farmed for many years, it is necessary to carry out dredging treatment, thoroughly remove the organic matter spoilage and spikes at the bottom of the pool, and open the flooding gate to rinse repeatedly.
2.2 Select a sunny day Use quicklime and other drugs to remove predators and pathogens.
2.3 When entering the water, a screen mesh of 40-60 mesh should be set at the inlet to prevent entry of predator organisms. The water intake time should be chosen from February to March, because this time the influent organisms are less harmful, which is conducive to the pond's food culture. Do not start too deep into the water, 30 ~ 40cm is appropriate.
2.4 Choose to breed fertility organisms at noon on a sunny day. Fertilize chicken manure in combination with inorganic fertilizer. When fertilizing, chicken manure should be diluted with water to spread evenly throughout the pool. Blocked chicken manure sinks into the bottom and is easily corrupted. According to the color decision.
2.5 Monitor and record the influent water quality. The monitoring contents include pH value, water temperature, salinity and quantification of plankton. When entering the water from the middle of the shrimp pond into the jellyfish aquaculture pond. The production process is: water supply → fertilization → propagation of phytoplankton → inoculation of zooplankton → sea bream.
2.6 Inoculation When the amount of phytoplankton in the pond reaches a certain density: the transparency is about 30cm, and when the water temperature is stable at about 18-20°C, rotifers and Artemia are inoculated. It is best to inoculate larvae that have just emerged at the time of inoculation. The inoculation density is From 2000 to 1000/m3, hatching eggs can also be used to hatch directly in the pool. Before inoculation, the hatching rate of dormant eggs and the number of eggs per gram should be determined to determine a reasonable inoculum size.
3, put the seedlings
3.1 Use 2cm or more high quality seedlings. Injured seedlings cannot be used.
3.2 The time for planting should be from June to July. Select the weather without wind and put it in the pool in the morning or evening. Water temperature is about 20°C.
3.3 The density of seedlings shall be determined according to the specific conditions of each pond, and the reasonable amount of seedlings shall be determined. The conditions for changing the water in the ponds may be better. It is advisable to store 4500 to 7500 eggs per square hectare of water, and the density is high. The jellyfish grow slowly and It is prone to lack of oxygen in the late culture period.
3.4 The seedlings should be transported with a smooth internal wall. Long-distance transport should be carried out by means of oxygenation, shading, and ice in plastic bags to prevent temperature rise.
3.5 When investing seedlings, attention should be paid to the indicators of physical and chemical factors such as water temperature and salinity in nursery ponds and growing ponds, and the gap between them should be adjusted as small as possible. In the upper hand of the pond, the boat was transported to the middle of the pool with a boat and evenly spread in the pool. Be careful when handling it. Do not injure the seedling.
4. The management work during the cultivation of sea bream during the development period is mainly to do a good job of regulating the water quality and doing a good job in water quality monitoring. Its main content is:
4.1 After the seedlings are stable for one week, wait until the young cubs gradually adapt to the environment and slowly add water. The water should be added within 10% to avoid excessive changes in the physical and chemical factors caused by large amounts of water.
4.2 Pay attention to the changes of water color, timely and appropriate fertilization to continue culturing phytoplankton. Under normal circumstances, the water color is dark brown and brownish green. If the water color is lightened, it indicates that the number of the monocytic algae in the water is reduced. At this time, some soymilk and soybeans should be fed. Such as bacon powder, 2 g/m3 2 times a day, to prevent the whole algae plankton to eat. Conditional can be re-inoculated and fertilized.
4.3 Before changing the water, monitor the water quality outside the pool, mainly for the measurement of water temperature, salinity, and biomass. If the indicators are different, you can't change the water. The variation of salinity difference can't be more than 5‰.
4.4 In the late growing season, the food intake of the jellyfish began to increase, and the biomass in the pool was insufficient. At this time, he began to take advantage of the integration of the three pools. Take a large drainage in the sea pond, and then enter the water from the adjacent pool gate. Before the gate, a fence net is added. The mesh is 40 to 60 mesh. Small nauplii and copepods enter the jellyfish rearing pool and Artemia adults continue to grow in the original pool.
4.5 Always pay attention to fresh water supplement. Use water lifting equipment to continuously add fresh water. Be careful not to cause local salinity to be too low when adding water. Pump fresh water in the fence first, and spread it slowly to the surrounding area.
4.6 The depth of water in the early period is maintained at about 1m. With the increase of individuals, the water level gradually increases to 1.5-2m, and the water temperature is stable at 20-28°C.
4.7 Regular observations of sea lice feeding conditions. The foods used for feeding are planktonic live foods. After the sea bream feeds, the transparent body of the medium glue layer can see the color of the feeding food in the central part. If it is transparent, the food in the pool is insufficient.
5. The growth rate of harvested sea bream is very fast. After 60 to 80 days of cultivation, individuals can reach 5 to 10 kg or more. When the water temperature drops below 18°C, the growth rate slows down, and at 15°C it basically stops feeding. At this time, it is necessary to collect in batches, capture large and small, and continue to be listed. The harvesting method can be diversified and fixed. Finally, you can take a drainage harvest method.
6. It is suggested that the key to the cultivation of jellyfish is to obtain a large amount of plankton. Therefore, it is particularly important to do a good job of water quality regulation and artificial cultivation of biological food. The so-called cultivation period management, in the final analysis, is to increase the cultivation of biomass through the monitoring of plankton biomass. In order to maintain a pool of jellyfish, the key is to maintain a pool of water.
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