Due to its low input costs, short production cycle, fewer diseases, low risk, and high revenue, the cultured sea bream attracts many farmers into the industry. In order to ensure steady and healthy development of the jellyfish culture, based on the two years of production experience in the Dandong region of Liaoning Province, the author summarized the technical points of the pond culture jellyfish for your reference.
I. Preparation of ponds and selection of suitable breeding stocks to increase catch-up rates.
Breeding sea otters should be selected in the conditions of good drainage and drainage, water depth 1.5m-2.0m, and a large area of ​​the pond as well.
Wild miscellaneous fish and crabs are the main enemy of the jellyfish, and they must be killed before they are released, and a 60 mesh-80 mesh inlet net is installed to prevent fish eggs from entering the pool. Drainage nets must be fenced and equipped with large and small meshes for mid-aquaculture and late replacement to prevent seabass from escaping with water during drainage.
A protective net is installed around the pond. Wooden piles (height of 2.5m) are inserted at the edge of the pond around the pond in front of the pond. The distance is 2m to 3m. The screen is enclosed by a 10 mesh screen. The top of the net is 30cm above the water surface. The function of the seine net is to prevent the jellyfish from being scratched by the wall of the pool due to abrupt changes in conditions such as wind waves and water flow, or pushed into shallow water and “grounded†to death.
There are prawns and shellfish in the clams, which will not cause direct damage to the jellyfish.
Under normal circumstances, feeding on natural baits that rely entirely on the pond for breeding, the pond can naturally sink (or change the amount of water by 10%/day to 30%/day) to a depth of 1.5m to 2.0m, and the density can be controlled at 100 pieces. / Mu, the average catch rate of cultured sea lice is 6%-l 5% (50kg-100kg per mu). In order to accurately grasp the amount of stocking in the pool, it is recommended that after the intermediate holdings are counted, it is advisable to stock 10 to 20 pieces per acre.
During the aquaculture process, the pool water temperature should be stable at 16°C-18°C, and the water depth should be maintained between 0.80m-1.20m. With the increase of individual seabream, the water depth should be gradually adjusted to 1.5m-2.0m.
Second, fertilizer, cultivate food organisms.
For ponds that are cultivated with prawn and cultivated sea breams, organic fertilizers that have been fermented prior to entering the water should be used as base fertilizer, and basic baits (mainly copepods and other zooplankton) should be fed into the pond at 300 kg/mu to 500 kg/mu for sea otters. Feeding. In the case of ponds lined with shellfish, it is not appropriate to apply the base fertilizer to a large area, and specific areas may be designated for fertilization, and organic fertilizers may be continuously added by means of hanging bags in the pool.
Sea otters mainly feed on small zooplankton in water, and they have a large amount of food. If the water quality is lean, sea otters will not only grow slowly, but also reduce the survival rate of culture. Therefore, how to solve and meet the demand of sea bream for bait is a key technology in aquaculture management and needs research to solve it.
There are two points to note when applying organic fertilizers: First, organic fertilizers must be thoroughly fermented (after decomposed) before they can be used, otherwise they will pollute the water quality. Second, the time, method, and quantity of fertilization should be determined based on changes in water color and water quality. Water quality monitoring, to grasp the appropriate time for the exchange of water and change the amount of water, that is, to maintain a good water quality environment, but also allows the body of water to provide a rich supply of food for feeding sea lice. In ponds that lack or are not suitable for application of organic fertilizers, inorganic fertilizers can be used instead. Apply urea lkg/mu~2kg/g, and superphosphate 2kg/mu~4kg/mu, once every half month.
Third, maintain a good water quality environment.
With the growth and development of sea otters, their individuals are constantly increasing, especially in the middle and later stages of human aquaculture (more than 3 kg of sea otters will be weighed more than 3 months after the seedlings are released). The water filtration volume of sea otters will increase and the water quality requirements will become stricter. In the meantime, a large number of jellyfish deaths are very likely to occur at this time, resulting in a very low recovery rate. When the pond enters and drains poorly, there will be early growth of the sea bream. When the body weight reaches 3kg/tablet—5kg/tablet, the water quality cannot meet the growth and survival requirements of the sea bream, and the growth rate slows and even anaerobic death occurs. - In general, during the rearing period and the rearing period, when the amount of sea otters in the pond reaches 10 pieces/mu, the daily water exchange volume should be maintained at 10% to 20% during low tide, and 30% at high tide. The increase in water exchange volume is a guarantee. One of the main technical keys to increase production and catch rate.
Fourth, timely harvest.
Under general conditions, when the sea bream is stocked for 50 days to 60 days and the individual weight reaches 5 kg/tablet to 10 kg/tablet, harvesting may be considered. In particular, the seedlings are released in mid-July. In mid-September, the water temperature will drop below 18°C, and the growth rate of sea lice will slow down (basically, when the water temperature is 15°C, it will basically stop eating). Some sexually mature sea lice may perform reproductive activities. Timely harvesting will affect the yield and catch rate. Therefore, no matter the size of the individual, it is recommended to harvest it before mid-September.
I. Preparation of ponds and selection of suitable breeding stocks to increase catch-up rates.
Breeding sea otters should be selected in the conditions of good drainage and drainage, water depth 1.5m-2.0m, and a large area of ​​the pond as well.
Wild miscellaneous fish and crabs are the main enemy of the jellyfish, and they must be killed before they are released, and a 60 mesh-80 mesh inlet net is installed to prevent fish eggs from entering the pool. Drainage nets must be fenced and equipped with large and small meshes for mid-aquaculture and late replacement to prevent seabass from escaping with water during drainage.
A protective net is installed around the pond. Wooden piles (height of 2.5m) are inserted at the edge of the pond around the pond in front of the pond. The distance is 2m to 3m. The screen is enclosed by a 10 mesh screen. The top of the net is 30cm above the water surface. The function of the seine net is to prevent the jellyfish from being scratched by the wall of the pool due to abrupt changes in conditions such as wind waves and water flow, or pushed into shallow water and “grounded†to death.
There are prawns and shellfish in the clams, which will not cause direct damage to the jellyfish.
Under normal circumstances, feeding on natural baits that rely entirely on the pond for breeding, the pond can naturally sink (or change the amount of water by 10%/day to 30%/day) to a depth of 1.5m to 2.0m, and the density can be controlled at 100 pieces. / Mu, the average catch rate of cultured sea lice is 6%-l 5% (50kg-100kg per mu). In order to accurately grasp the amount of stocking in the pool, it is recommended that after the intermediate holdings are counted, it is advisable to stock 10 to 20 pieces per acre.
During the aquaculture process, the pool water temperature should be stable at 16°C-18°C, and the water depth should be maintained between 0.80m-1.20m. With the increase of individual seabream, the water depth should be gradually adjusted to 1.5m-2.0m.
Second, fertilizer, cultivate food organisms.
For ponds that are cultivated with prawn and cultivated sea breams, organic fertilizers that have been fermented prior to entering the water should be used as base fertilizer, and basic baits (mainly copepods and other zooplankton) should be fed into the pond at 300 kg/mu to 500 kg/mu for sea otters. Feeding. In the case of ponds lined with shellfish, it is not appropriate to apply the base fertilizer to a large area, and specific areas may be designated for fertilization, and organic fertilizers may be continuously added by means of hanging bags in the pool.
Sea otters mainly feed on small zooplankton in water, and they have a large amount of food. If the water quality is lean, sea otters will not only grow slowly, but also reduce the survival rate of culture. Therefore, how to solve and meet the demand of sea bream for bait is a key technology in aquaculture management and needs research to solve it.
There are two points to note when applying organic fertilizers: First, organic fertilizers must be thoroughly fermented (after decomposed) before they can be used, otherwise they will pollute the water quality. Second, the time, method, and quantity of fertilization should be determined based on changes in water color and water quality. Water quality monitoring, to grasp the appropriate time for the exchange of water and change the amount of water, that is, to maintain a good water quality environment, but also allows the body of water to provide a rich supply of food for feeding sea lice. In ponds that lack or are not suitable for application of organic fertilizers, inorganic fertilizers can be used instead. Apply urea lkg/mu~2kg/g, and superphosphate 2kg/mu~4kg/mu, once every half month.
Third, maintain a good water quality environment.
With the growth and development of sea otters, their individuals are constantly increasing, especially in the middle and later stages of human aquaculture (more than 3 kg of sea otters will be weighed more than 3 months after the seedlings are released). The water filtration volume of sea otters will increase and the water quality requirements will become stricter. In the meantime, a large number of jellyfish deaths are very likely to occur at this time, resulting in a very low recovery rate. When the pond enters and drains poorly, there will be early growth of the sea bream. When the body weight reaches 3kg/tablet—5kg/tablet, the water quality cannot meet the growth and survival requirements of the sea bream, and the growth rate slows and even anaerobic death occurs. - In general, during the rearing period and the rearing period, when the amount of sea otters in the pond reaches 10 pieces/mu, the daily water exchange volume should be maintained at 10% to 20% during low tide, and 30% at high tide. The increase in water exchange volume is a guarantee. One of the main technical keys to increase production and catch rate.
Fourth, timely harvest.
Under general conditions, when the sea bream is stocked for 50 days to 60 days and the individual weight reaches 5 kg/tablet to 10 kg/tablet, harvesting may be considered. In particular, the seedlings are released in mid-July. In mid-September, the water temperature will drop below 18°C, and the growth rate of sea lice will slow down (basically, when the water temperature is 15°C, it will basically stop eating). Some sexually mature sea lice may perform reproductive activities. Timely harvesting will affect the yield and catch rate. Therefore, no matter the size of the individual, it is recommended to harvest it before mid-September.
There are three main types of Rice.
In
GB/T 1354-2009 "Rice National Standards", there are only three types of
rice: glutinous rice, glutinous rice and glutinous rice.
Pick rice three steps
Look
Packed
rice first look at whether the packaging is marked with QS mark,
product name, net content, production date and shelf life, quality
grade, product standard number and other information.
Look at the color and size of the rice grains in bulk to see if there are broken rice or yellow grains.
smell
Premium rice has a natural valley scent and no smell.
taste
New rice has a higher protein content and is harder than Chenmi.
Royal Basmati Rice,Nutritious Rice,Medium Grain Rice,Short Grain Rice
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