The oyster shell is one of the important biological characteristics of shrimp, and has a direct relationship with the development of larvae, the growth of larvae and shrimp, and the reproduction of broodstock. Understanding and mastering the relationship between its growth and clam shells and the laws of clam shells is of great significance for raising Macrobrachium rosenbergii, increasing its size, yield, and economic efficiency of shrimp farming.
First, why Macrobrachium rosenbergii shellfish Macrobrachium shrimp body surface has a chitin shell, it is the exoskeleton of shrimp, in order to replace the body of this layer of exoskeleton, so that shrimp grow up, must continue to Shells to achieve. The growth of the shrimp body can only be performed after the old shell has been removed and before the new shell is hardened. Therefore, the regular oyster shell has become an inevitable rule for the growth and development of shrimp.
Second, there are three types of Macrobrachium rosenbergii molluscs metamorphosis, growth, reproduction and appendage regeneration must be achieved through the oyster shell. It includes three types.
l, growth oysters: shrimp development, metamorphosis, juvenile shrimp and shrimp growth must be achieved through the growth of oyster shell. The shell length and body weight of larvae and adult shrimps increased significantly once per shell, and the majority of the oysters of Macrobrachium rosenbergii grew as pods.
2, genital oyster shell: females before the oviposition to carry out a oyster shell, male and female mate after the ovulation, spawning, after the oyster shell of the female swimmer's feet at the base of the egg with bristles. There was no increase in body weight after genital aponeurosis.
3, regenerate shell: Due to the appendage defect of shrimp, in order to make it regenerate, it must be done through the way of shell. This regenerated clam shell does not have much weight gain. In addition, when the environment suddenly changes, Macrobrachium sometimes clams to adapt to the environment.
3. How the Macrobrachium rosenbergii shells the larvae of the prawns stage to the prawns stage. Before the old shells are removed, a new shell is formed. There is a thin layer of liquid between the old and new shells to separate the two. The body of the shrimp stopped its movement, lying sideways on the bottom of the water, splitting the membrane between the cephalothorax and the plastron, followed by the cephalothoracism, and then the larval body was subjected to a vigorous flexion and extension action. The whole body of shrimp was from the old shell. Jump out and complete the oyster shell process. The old shells under the armpit include the head breastplate, plastron, forehead, compound eyes, appendages, gills, stomach, intestines, and anus, etc. The old shells are joined together, as if a complete coat is plucked from the body of the shrimp. Each time the larvae once cover their shells, not only the body is enlarged, but also some morphological structures are built from scratch, gradually improving from simple to complex.
4. What are the factors related to Macrobrachium rosenbergii?
1, Macrobrachium squash cycle is related to age. The larvae generally have a short pod cycle and long shrimp cycle. When the water temperature is suitable, the larval development stage takes 2 to 3 days to molt once, and the larval stage takes 4 to 6 days to clamshell once. For the shrimp stage, shelling is done once for 7 to 10 or more days. Sexually mature broodstock is separated by about 30 days.
2, Macrobrachium esculenta season is related to the season. The macrobrachium rosenbergii under the conditions of culture in the plastic shed pond in our district was from May to September in the oyster shell period, and it was the most abundant from the beginning of June to the beginning of September. By the end of September, the water temperature has dropped significantly and the shell has been reduced. However, in the cold season, if artificially increasing the water temperature, macrobrachies still appear oyster shell phenomenon. Also in the hot season, artificially reduce the water temperature, Macrobrachium can also stop the shell.
3. Macrobrachium clam shells are carried out at night most of the time. Macrobrachium esculenta in the Loch area is carried out at night most of the time. There is a period of time before and after the clam shell does not eat, each clamshell time depending on the water temperature and physical strength is different, under appropriate conditions, healthy shrimp about 2 minutes, such as low water temperature, shrimp weak, appendage defects In other cases, the clam shell takes a long time, even if it is too long for a long period of time, it will be dead in the old shell.
4. Macrobrachium esculenta is related to dissolved oxygen in water. Macrobrachium rosenbergii can accommodate dissolved oxygen levels above 3 mg/l. Oxygen content in water is beneficial to treat shrimp clam shell. It has been observed that every time Macrobrachium anoxic floats its head, the soft-shelled shrimp of the oyster shell is always floating first. Therefore, the best dissolved oxygen in shrimp ponds is 5 mg/l or more.
5. Macrobrachium oyster shells are related to water quality. Macrobrachium praecox enjoys fresh water quality, and often keeps the water fresh, which is beneficial to the growth of freshwater prawns. Experience has shown that whenever shrimp ponds flush with fresh water, there will be a large amount of prawns.
6, feeding fresh live animal feed can promote Macrobrachium oyster shell. The diet of Macrobrachium rosenbergii is very wide, and in general it is more like animal feed. In the artificial breeding can often be fed some live animal feed, it has a good role in promoting the oyster shell of Roche marsh.
7. Calcium and phosphorus are the limiting factors for the growth of shrimp oyster shells. And lack of, it can not be smooth pod growth. The oyster shell is an intrinsic physiological characteristic of Macrobrachium rosenbergii. It contains many positive meanings. It also brings great danger. Due to the weakening activity of Macrobrachium rosenbergii during clam shelling, especially when the clam shells were placed on the side of the water bottom, the shrimp body was almost stationary. Even if the oyster shells can stand up after a few minutes, the body of the shrimp is still soft at least for half a day. During this period, it is often a good opportunity for carnivorous fish and similar foods. Therefore, it will cause great casualties. In order to reduce the survival rate, according to this situation, a safety measure should be added to the safety clam shell of Macrobrachium during farming. For example, plant aquatic plants in shrimp ponds and put some bamboo sticks and bamboo baskets. All are effective ways.
First, why Macrobrachium rosenbergii shellfish Macrobrachium shrimp body surface has a chitin shell, it is the exoskeleton of shrimp, in order to replace the body of this layer of exoskeleton, so that shrimp grow up, must continue to Shells to achieve. The growth of the shrimp body can only be performed after the old shell has been removed and before the new shell is hardened. Therefore, the regular oyster shell has become an inevitable rule for the growth and development of shrimp.
Second, there are three types of Macrobrachium rosenbergii molluscs metamorphosis, growth, reproduction and appendage regeneration must be achieved through the oyster shell. It includes three types.
l, growth oysters: shrimp development, metamorphosis, juvenile shrimp and shrimp growth must be achieved through the growth of oyster shell. The shell length and body weight of larvae and adult shrimps increased significantly once per shell, and the majority of the oysters of Macrobrachium rosenbergii grew as pods.
2, genital oyster shell: females before the oviposition to carry out a oyster shell, male and female mate after the ovulation, spawning, after the oyster shell of the female swimmer's feet at the base of the egg with bristles. There was no increase in body weight after genital aponeurosis.
3, regenerate shell: Due to the appendage defect of shrimp, in order to make it regenerate, it must be done through the way of shell. This regenerated clam shell does not have much weight gain. In addition, when the environment suddenly changes, Macrobrachium sometimes clams to adapt to the environment.
3. How the Macrobrachium rosenbergii shells the larvae of the prawns stage to the prawns stage. Before the old shells are removed, a new shell is formed. There is a thin layer of liquid between the old and new shells to separate the two. The body of the shrimp stopped its movement, lying sideways on the bottom of the water, splitting the membrane between the cephalothorax and the plastron, followed by the cephalothoracism, and then the larval body was subjected to a vigorous flexion and extension action. The whole body of shrimp was from the old shell. Jump out and complete the oyster shell process. The old shells under the armpit include the head breastplate, plastron, forehead, compound eyes, appendages, gills, stomach, intestines, and anus, etc. The old shells are joined together, as if a complete coat is plucked from the body of the shrimp. Each time the larvae once cover their shells, not only the body is enlarged, but also some morphological structures are built from scratch, gradually improving from simple to complex.
4. What are the factors related to Macrobrachium rosenbergii?
1, Macrobrachium squash cycle is related to age. The larvae generally have a short pod cycle and long shrimp cycle. When the water temperature is suitable, the larval development stage takes 2 to 3 days to molt once, and the larval stage takes 4 to 6 days to clamshell once. For the shrimp stage, shelling is done once for 7 to 10 or more days. Sexually mature broodstock is separated by about 30 days.
2, Macrobrachium esculenta season is related to the season. The macrobrachium rosenbergii under the conditions of culture in the plastic shed pond in our district was from May to September in the oyster shell period, and it was the most abundant from the beginning of June to the beginning of September. By the end of September, the water temperature has dropped significantly and the shell has been reduced. However, in the cold season, if artificially increasing the water temperature, macrobrachies still appear oyster shell phenomenon. Also in the hot season, artificially reduce the water temperature, Macrobrachium can also stop the shell.
3. Macrobrachium clam shells are carried out at night most of the time. Macrobrachium esculenta in the Loch area is carried out at night most of the time. There is a period of time before and after the clam shell does not eat, each clamshell time depending on the water temperature and physical strength is different, under appropriate conditions, healthy shrimp about 2 minutes, such as low water temperature, shrimp weak, appendage defects In other cases, the clam shell takes a long time, even if it is too long for a long period of time, it will be dead in the old shell.
4. Macrobrachium esculenta is related to dissolved oxygen in water. Macrobrachium rosenbergii can accommodate dissolved oxygen levels above 3 mg/l. Oxygen content in water is beneficial to treat shrimp clam shell. It has been observed that every time Macrobrachium anoxic floats its head, the soft-shelled shrimp of the oyster shell is always floating first. Therefore, the best dissolved oxygen in shrimp ponds is 5 mg/l or more.
5. Macrobrachium oyster shells are related to water quality. Macrobrachium praecox enjoys fresh water quality, and often keeps the water fresh, which is beneficial to the growth of freshwater prawns. Experience has shown that whenever shrimp ponds flush with fresh water, there will be a large amount of prawns.
6, feeding fresh live animal feed can promote Macrobrachium oyster shell. The diet of Macrobrachium rosenbergii is very wide, and in general it is more like animal feed. In the artificial breeding can often be fed some live animal feed, it has a good role in promoting the oyster shell of Roche marsh.
7. Calcium and phosphorus are the limiting factors for the growth of shrimp oyster shells. And lack of, it can not be smooth pod growth. The oyster shell is an intrinsic physiological characteristic of Macrobrachium rosenbergii. It contains many positive meanings. It also brings great danger. Due to the weakening activity of Macrobrachium rosenbergii during clam shelling, especially when the clam shells were placed on the side of the water bottom, the shrimp body was almost stationary. Even if the oyster shells can stand up after a few minutes, the body of the shrimp is still soft at least for half a day. During this period, it is often a good opportunity for carnivorous fish and similar foods. Therefore, it will cause great casualties. In order to reduce the survival rate, according to this situation, a safety measure should be added to the safety clam shell of Macrobrachium during farming. For example, plant aquatic plants in shrimp ponds and put some bamboo sticks and bamboo baskets. All are effective ways.
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