The use of coastal ponds for the cultivation of sea bream, along the coast of Binzhou in the Bohai Bay, has become another highlight after seawater pond rearing of Penaeus vannamei. The Zhanhua Fisheries Bureau of Shandong Province, after two or three years of trial and breeding, found that five external factors are critical to the growth of sea otters.
First, the number of bait creatures. The growth of sea otters is inseparable from the bait because sea lice only eat live plankton, such as copepods, horned horns, small crustaceans, and some organic crumbs, especially rotifers and Artemia. In the usual culture, people mainly maintain the biomass of the water by changing the water and artificially applying fertilizer to promote the rapid growth of the sea otters. In the early stage of cultivation, plankton is abundant in the ponds, the basic bait is better, the juveniles have low food intake, and the bait's bait is not a problem. However, when the length of the umbrella is about 10 centimeters long, due to its late night feeding and large food intake, the amount of plankton in the pond can no longer meet the growth needs. At this time, on the one hand, in the corner of the rearing pond, a cocklepod breeding pool is specially formed in the corner of the growing pond. Fertilizing and artificial management are applied to the cocklepods in a timely manner. The cocklepods are caught in a timely manner in the rearing pond and the seabream begins to grow; On the one hand, the acquisition or acquisition of natural rotifers, Artemia or Cladocera, for live feeding, the effect is very obvious, the sea otters quickly recovered. It can be seen that the storage amount of food organisms in ponds plays a key role in the rapid growth of sea otters.
Second, water and drainage. In order to raise water and raise water, the water body must maintain “fat, live, tender, and coolâ€, and it must always enter and drain water to provide enough food organisms for the growth of the sea otters. On the one hand, through the intake and drainage, it can supplement the plankton biomass in the water body and ensure that there are enough food organisms. On the other hand, regular slow-moving and slow discharge can not only ensure that the water body is fresh and cool, but also the growth of sea otters. It will stimulate and promote.
Third, to maintain the balance of physical and chemical factors of water. The survival and growth of any living organism are closely related to the external environment. Sea otters are no exception. They have requirements for temperature, salinity, pH value, dissolved oxygen, ammonia nitrogen, etc. They can survive under adapted conditions and can be quickly adapted to suitable environments. Growth, only when the water temperature at 18 ~ 28 °C, salinity 18 ‰ ~ 28 ‰, pH 7.5 ~ 8.5, dissolved oxygen ≥ 1.5 mg / liter, the jellyfish active, increased food intake, rapid growth.
Fourth, the level of water salinity. The normal salinity of sea lice grows in the range of 12 ‰ to 35 ‰, and grows rapidly within 18 ‰ to 25 ç› of salinity. Through multiple sets of comparative experiments, it can be found that salinity is generally inversely proportional to the growth rate when the external environmental conditions are constant, that is to say when the salinity is reduced, the growth rate of sea lice will increase when it is within a suitable range. When sea breams are cultured, freshwater should be injected regularly to reduce the salinity of the pool water to increase the growth rate of sea lice.
Fifth, the primary productivity of the water body. Experts have repeatedly demonstrated that there are six indicators that are directly related to the whole growth process of sea otters. They are primary productivity, light intensity, salinity, transparency, and plankton, and primary productivity is an important factor affecting the growth of sea otters. Blasting disease is prone to occur during the growth of sea lice, especially in the Bohai Bay region. An important factor is the lack of primary productivity. According to the analysis, except for the effects of light, salinity, and nutrient, the primary productivity is mainly due to the transparency of seawater. According to the relationship between transparency and primary productivity, within a certain range, it is necessary to increase the transparency of the water body by injecting fresh water and ensure that there is sufficient primary productivity to promote the rapid growth of sea lice.
First, the number of bait creatures. The growth of sea otters is inseparable from the bait because sea lice only eat live plankton, such as copepods, horned horns, small crustaceans, and some organic crumbs, especially rotifers and Artemia. In the usual culture, people mainly maintain the biomass of the water by changing the water and artificially applying fertilizer to promote the rapid growth of the sea otters. In the early stage of cultivation, plankton is abundant in the ponds, the basic bait is better, the juveniles have low food intake, and the bait's bait is not a problem. However, when the length of the umbrella is about 10 centimeters long, due to its late night feeding and large food intake, the amount of plankton in the pond can no longer meet the growth needs. At this time, on the one hand, in the corner of the rearing pond, a cocklepod breeding pool is specially formed in the corner of the growing pond. Fertilizing and artificial management are applied to the cocklepods in a timely manner. The cocklepods are caught in a timely manner in the rearing pond and the seabream begins to grow; On the one hand, the acquisition or acquisition of natural rotifers, Artemia or Cladocera, for live feeding, the effect is very obvious, the sea otters quickly recovered. It can be seen that the storage amount of food organisms in ponds plays a key role in the rapid growth of sea otters.
Second, water and drainage. In order to raise water and raise water, the water body must maintain “fat, live, tender, and coolâ€, and it must always enter and drain water to provide enough food organisms for the growth of the sea otters. On the one hand, through the intake and drainage, it can supplement the plankton biomass in the water body and ensure that there are enough food organisms. On the other hand, regular slow-moving and slow discharge can not only ensure that the water body is fresh and cool, but also the growth of sea otters. It will stimulate and promote.
Third, to maintain the balance of physical and chemical factors of water. The survival and growth of any living organism are closely related to the external environment. Sea otters are no exception. They have requirements for temperature, salinity, pH value, dissolved oxygen, ammonia nitrogen, etc. They can survive under adapted conditions and can be quickly adapted to suitable environments. Growth, only when the water temperature at 18 ~ 28 °C, salinity 18 ‰ ~ 28 ‰, pH 7.5 ~ 8.5, dissolved oxygen ≥ 1.5 mg / liter, the jellyfish active, increased food intake, rapid growth.
Fourth, the level of water salinity. The normal salinity of sea lice grows in the range of 12 ‰ to 35 ‰, and grows rapidly within 18 ‰ to 25 ç› of salinity. Through multiple sets of comparative experiments, it can be found that salinity is generally inversely proportional to the growth rate when the external environmental conditions are constant, that is to say when the salinity is reduced, the growth rate of sea lice will increase when it is within a suitable range. When sea breams are cultured, freshwater should be injected regularly to reduce the salinity of the pool water to increase the growth rate of sea lice.
Fifth, the primary productivity of the water body. Experts have repeatedly demonstrated that there are six indicators that are directly related to the whole growth process of sea otters. They are primary productivity, light intensity, salinity, transparency, and plankton, and primary productivity is an important factor affecting the growth of sea otters. Blasting disease is prone to occur during the growth of sea lice, especially in the Bohai Bay region. An important factor is the lack of primary productivity. According to the analysis, except for the effects of light, salinity, and nutrient, the primary productivity is mainly due to the transparency of seawater. According to the relationship between transparency and primary productivity, within a certain range, it is necessary to increase the transparency of the water body by injecting fresh water and ensure that there is sufficient primary productivity to promote the rapid growth of sea lice.
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