Yuesao commonly known as the seven-star fish, mountain fish, star fish, starfish, fish and other fish. The protein content of Yueshao is high (the content of crude protein of muscle dry matter is up to 79.25%), and the meat is delicate, with less spurs and delicious taste. In recent years, many farmers have carried out large-scale farming in Guangdong and Guangxi, and they have mass production. The economic benefits are quite significant.
The moon's shape is similar to that of the Umbellum, and its long cylindrical shape differs from that of the Ukrainian dragonfly mainly in that it has no pelvic fins, and the line breaks above the starting point of the anal fin. Each side of the base of the lunar caudal fin has a white, black, round black patch on each side. Its head and body back are green-brown or grayish black, and its abdomen is grayish or light yellow, with 7 to 10 "blats"-shaped grey markings along the middle of the body. The whole body is evenly distributed with small gray spots, and the males are more shiny in the reproductive season.
Artificial Reproduction of Moons
1. The broodstock's maturation of the broodstock is a key to the success of artificial reproduction of the moon's roost, so broodstock breeding is very important. The following points should be noted when nurturing broodstock: (1) 100g and more than one winter-old moonrocket adult fish is selected as the broodstock; (2) The moonsheep is not active in the winter or early spring season, preferring to drill caves or mud for winter, so the most Fortunately, in the broodstock cultivation pool, some bamboo or tile jars are provided for the moonfly to inhabit; (3) After the spring, when the water temperature reaches 12°C or more, it is necessary to carry out intensive cultivation, feed artificial diet or high-quality compound feed, and the content of crude protein of compound feed must be More than 42%, and appropriate feeding of fresh frozen fish, etc., in order to fully meet the needs of their gonadal development; (4) do a good job in preventing escape, disease prevention and daily management.
2. Male and female identification of the male and female morphotypes are similar and difficult to distinguish. Mature females have large, soft, round holes in the abdomen, and mature and slightly open. The male fish's holes are narrow and dimpled. Careful observation showed that there were no or few grey spots on the anal fins of the females, while many small spots were distributed around the anal fins of the males and on the vent holes. In addition, there is a male staring star on the pectoral fins, but many males do not follow the stars.
3. The reproductive water temperature of the artificial puerperium is 18-28°C, but the effect of oxytocin production is good at 20-25°C. Artificial fertilization is generally used to artificially inseminate natural fertilization methods, and less commonly used artificial insemination methods. HCG is used as an inducing drug, and HCG+LRH-A or pituitary can also be used. As long as the broodstock is mature, the use of HCG alone is economical, effective, and easy to use. Therefore, HCG is generally used for single-chest injection. Its injection dose is 1000-1500IU/kg.
After spawning, the broodstock is placed in a pre-prepared spawning pond or pond at a ratio of 1:1. The effect time of broodstock after oxytocin production is generally 2-4 days. After the broodstock spawns in the spawning pond, the fertilized eggs can be removed and incubated in the hatchery pond. The broodstock can also be removed and the fertilized eggs can be left to hatch in the original pond. In the pond, fertilized eggs are collected and hatched in a prepared hatchery or pond. Fertilized egg hatching time is generally 2-3 days. The length of incubation varies with the temperature of the water. The fertilized eggs that have just been produced are golden yellow and turn gray with the division of the cells and the development of the embryos, while the unfertilized eggs turn white. Fertilized eggs hatch larvae after 2-3 days. The newly hatched larvae are transparent in shape, resembling crickets, heads and tails, and a large yolk sac and oil globules in the abdominal cavity. On the third day, the fish turned black. On the fourth day, the larvae began to swim flat. On the fifth day, the larvae began feeding.
4. The larvae started to feed on the fifth day after the larvae came out of the membrane. At this time, they are in a mixed nutrition stage. A large number of zooplankton must be cultivated in the nursery pond for the fish to open their mouths to eat. Otherwise, the fry will not be able to obtain the open bait in time and reduce the time. Seedling rate. At the beginning of the opening, the fry were fed with rotifers, cladoceros, and copepods. As the individuals grew larger, the fry began to ingest larger food organisms, such as aquatic oligochaites, chironomid larvae and other aquatic insects. At this time, if the natural food is insufficient, artificial feed should be fed to meet the needs of the growth and development of the fry. Artificially fed baits mainly include red worms, cockroaches, fish gills, and fly maggots. When the fry grows to more than 6cm, the digestive system has developed well, and the dietary habits are close to adult fish and begin to feed small fish and shrimp. At this time, it is easy to cause mutual hunger due to hunger. Therefore, measures should be taken to classify and separate ponds for large-scale seedlings cultivation or adult fish farming. In the breeding stage, the stocking densities can be relatively high and they can stock 50-80,000 tails per mu (1/15 hectares). At this stage, attention should be paid to the following points: (1) Thoroughly disinfect the whole pond before putting it on seedlings. (2) Numerous plankton should be cultivated to ensure that fish fry open their food. (3) If the natural food is not enough, it is necessary to feed enough artificial diet to feed the fish fry, so that the fry can not eat each other due to hunger. (4) When the fry size is large, it must be graded and cultivated in the pond. (5) Due to the artificial domestication of the fry during the easy-domesticated opening period, when the fry reaches a certain size, it is necessary to domesticate the fish or feed, etc., to create conditions for the breeding of commercial fish. (6) Do a good job in disease prevention and control.
Adult culture of moonfish culture can be carried out in various ways, such as: (1) Monoculture in earthen ponds. (2) Earthen polyculture. (3) Garden culture. (4) Cement pond intensive care. (5) Rice field farming. Generally speaking, the way of single-cultivation in earthen ponds is more, the following mainly introduces the way of single-cultivation in earthen ponds:
1. Before the fish species are put into preparation, the area of ​​fish ponds is generally 1-5 mu, pool depth is 2-2.5m, and water depth is 1.5-1.8m. Before the fry is released, the whole pond is splashed and disinfected with quicklime, and the tea seed is mixed with strict ponds to increase fertility. Then inject new water, the water depth can be about 1m, and gradually raise the water level. In general, seedlings can be planted 7-10 days after the poisonous pond. Because the moonlight is dark, we must stock some water hyacinths on the surface of the fish ponds. The water hyacinth should be about 1/3 of the total area of ​​the water body, and use bamboos to separate the water hyacinths from the side of the pond. For the moon to hide, but also to purify water. At the same time, because the moon is good for drilling caves, it is better to put some bamboo or tile in the bottom of the pond for the moon to drill and inhabit.
2. Fish species stocked by fingerlings are required to have robust physique and neat specifications in order to avoid morbidity and residual food. Body length requirements in more than 4 - 5cm, in order to facilitate rapid domestication feeding artificial diet. And fish species are required to be put in before June to facilitate the listing of developed fish products. Because of the small individual weight of the moon, it is required to achieve high yield with high density, and the yield per mu can reach more than 1000kg.
3. After the bait feeds the fish species, the plankton in the pond is far from meeting the feeding needs of the caterpillar and must be fed artificial bait. Artificial bait is mainly used for compound feed and frozen fresh fish. Start a small number of multiple feeding, slowly acclimating to feeding 2-3 times a day. Feeding methods should be fed while eating, until the food is stopped; you can also set the feed table positioning feeding, check the daily eating situation, in order to adjust the amount of feeding to prevent waste. The daily feeding amount is about 5-8% of the fish's weight. The crude protein content of the artificial compound feed should not be less than 40%.
4. The daily management of dietary protein content of the moonfish is quite high and it is easy to cause high ammonia nitrogen concentration in the water body. Especially in summer, when the water temperature is high, it is prone to nitrogen odor, which is extremely harmful to the growth and development of Yueshao, and even causes a large number of deaths. Therefore, it is necessary to control the water quality, change the water frequently, keep the water in the pool light green, keep the water fresh, and strictly waterproof. Black, smelly. At the same time, to strengthen the management of feed, prevent food bastard deterioration, so that the bait "four set." Moons grow to more than 10cm, jumping ability to strengthen, especially in the rainy day or change the water, jump is very active, so we must do a good job of escape. It is required that the height of the pool from the water should not be less than 50cm. In the inlet and outlet, we must do a good job of anti-escape facilities. In the flood season, we must use high mesh around the pool. Observe the patrol ponds on a daily basis and carefully observe the monthly feeding and activities. Pay attention to changes in water quality and whether the facilities have been damaged. If any problems are found, they must be dealt with immediately.
5. Fish disease prevention and control of onychomycosis has strong resistance to diseases, and there are fewer diseases in the breeding process. However, we must adhere to the following prevention and treatment of fish diseases: (1) Mildly disinfecting water body with lime every 10-15 days; (2) Bacteria When sick, use 0.50.000001 furazolidone or 10.000001 bleach to spread across the pool; (3) parasites use 0.50.000001 crystal trichlorfon or 0.70.000001 copper sulphate, ferrous sulfate or 250.000001-400.000001 Ma Lin Quan Quan splashed; (4) Saprolegnia soaked with maltite green 20.000001 for 5 min.
The moon's shape is similar to that of the Umbellum, and its long cylindrical shape differs from that of the Ukrainian dragonfly mainly in that it has no pelvic fins, and the line breaks above the starting point of the anal fin. Each side of the base of the lunar caudal fin has a white, black, round black patch on each side. Its head and body back are green-brown or grayish black, and its abdomen is grayish or light yellow, with 7 to 10 "blats"-shaped grey markings along the middle of the body. The whole body is evenly distributed with small gray spots, and the males are more shiny in the reproductive season.
Artificial Reproduction of Moons
1. The broodstock's maturation of the broodstock is a key to the success of artificial reproduction of the moon's roost, so broodstock breeding is very important. The following points should be noted when nurturing broodstock: (1) 100g and more than one winter-old moonrocket adult fish is selected as the broodstock; (2) The moonsheep is not active in the winter or early spring season, preferring to drill caves or mud for winter, so the most Fortunately, in the broodstock cultivation pool, some bamboo or tile jars are provided for the moonfly to inhabit; (3) After the spring, when the water temperature reaches 12°C or more, it is necessary to carry out intensive cultivation, feed artificial diet or high-quality compound feed, and the content of crude protein of compound feed must be More than 42%, and appropriate feeding of fresh frozen fish, etc., in order to fully meet the needs of their gonadal development; (4) do a good job in preventing escape, disease prevention and daily management.
2. Male and female identification of the male and female morphotypes are similar and difficult to distinguish. Mature females have large, soft, round holes in the abdomen, and mature and slightly open. The male fish's holes are narrow and dimpled. Careful observation showed that there were no or few grey spots on the anal fins of the females, while many small spots were distributed around the anal fins of the males and on the vent holes. In addition, there is a male staring star on the pectoral fins, but many males do not follow the stars.
3. The reproductive water temperature of the artificial puerperium is 18-28°C, but the effect of oxytocin production is good at 20-25°C. Artificial fertilization is generally used to artificially inseminate natural fertilization methods, and less commonly used artificial insemination methods. HCG is used as an inducing drug, and HCG+LRH-A or pituitary can also be used. As long as the broodstock is mature, the use of HCG alone is economical, effective, and easy to use. Therefore, HCG is generally used for single-chest injection. Its injection dose is 1000-1500IU/kg.
After spawning, the broodstock is placed in a pre-prepared spawning pond or pond at a ratio of 1:1. The effect time of broodstock after oxytocin production is generally 2-4 days. After the broodstock spawns in the spawning pond, the fertilized eggs can be removed and incubated in the hatchery pond. The broodstock can also be removed and the fertilized eggs can be left to hatch in the original pond. In the pond, fertilized eggs are collected and hatched in a prepared hatchery or pond. Fertilized egg hatching time is generally 2-3 days. The length of incubation varies with the temperature of the water. The fertilized eggs that have just been produced are golden yellow and turn gray with the division of the cells and the development of the embryos, while the unfertilized eggs turn white. Fertilized eggs hatch larvae after 2-3 days. The newly hatched larvae are transparent in shape, resembling crickets, heads and tails, and a large yolk sac and oil globules in the abdominal cavity. On the third day, the fish turned black. On the fourth day, the larvae began to swim flat. On the fifth day, the larvae began feeding.
4. The larvae started to feed on the fifth day after the larvae came out of the membrane. At this time, they are in a mixed nutrition stage. A large number of zooplankton must be cultivated in the nursery pond for the fish to open their mouths to eat. Otherwise, the fry will not be able to obtain the open bait in time and reduce the time. Seedling rate. At the beginning of the opening, the fry were fed with rotifers, cladoceros, and copepods. As the individuals grew larger, the fry began to ingest larger food organisms, such as aquatic oligochaites, chironomid larvae and other aquatic insects. At this time, if the natural food is insufficient, artificial feed should be fed to meet the needs of the growth and development of the fry. Artificially fed baits mainly include red worms, cockroaches, fish gills, and fly maggots. When the fry grows to more than 6cm, the digestive system has developed well, and the dietary habits are close to adult fish and begin to feed small fish and shrimp. At this time, it is easy to cause mutual hunger due to hunger. Therefore, measures should be taken to classify and separate ponds for large-scale seedlings cultivation or adult fish farming. In the breeding stage, the stocking densities can be relatively high and they can stock 50-80,000 tails per mu (1/15 hectares). At this stage, attention should be paid to the following points: (1) Thoroughly disinfect the whole pond before putting it on seedlings. (2) Numerous plankton should be cultivated to ensure that fish fry open their food. (3) If the natural food is not enough, it is necessary to feed enough artificial diet to feed the fish fry, so that the fry can not eat each other due to hunger. (4) When the fry size is large, it must be graded and cultivated in the pond. (5) Due to the artificial domestication of the fry during the easy-domesticated opening period, when the fry reaches a certain size, it is necessary to domesticate the fish or feed, etc., to create conditions for the breeding of commercial fish. (6) Do a good job in disease prevention and control.
Adult culture of moonfish culture can be carried out in various ways, such as: (1) Monoculture in earthen ponds. (2) Earthen polyculture. (3) Garden culture. (4) Cement pond intensive care. (5) Rice field farming. Generally speaking, the way of single-cultivation in earthen ponds is more, the following mainly introduces the way of single-cultivation in earthen ponds:
1. Before the fish species are put into preparation, the area of ​​fish ponds is generally 1-5 mu, pool depth is 2-2.5m, and water depth is 1.5-1.8m. Before the fry is released, the whole pond is splashed and disinfected with quicklime, and the tea seed is mixed with strict ponds to increase fertility. Then inject new water, the water depth can be about 1m, and gradually raise the water level. In general, seedlings can be planted 7-10 days after the poisonous pond. Because the moonlight is dark, we must stock some water hyacinths on the surface of the fish ponds. The water hyacinth should be about 1/3 of the total area of ​​the water body, and use bamboos to separate the water hyacinths from the side of the pond. For the moon to hide, but also to purify water. At the same time, because the moon is good for drilling caves, it is better to put some bamboo or tile in the bottom of the pond for the moon to drill and inhabit.
2. Fish species stocked by fingerlings are required to have robust physique and neat specifications in order to avoid morbidity and residual food. Body length requirements in more than 4 - 5cm, in order to facilitate rapid domestication feeding artificial diet. And fish species are required to be put in before June to facilitate the listing of developed fish products. Because of the small individual weight of the moon, it is required to achieve high yield with high density, and the yield per mu can reach more than 1000kg.
3. After the bait feeds the fish species, the plankton in the pond is far from meeting the feeding needs of the caterpillar and must be fed artificial bait. Artificial bait is mainly used for compound feed and frozen fresh fish. Start a small number of multiple feeding, slowly acclimating to feeding 2-3 times a day. Feeding methods should be fed while eating, until the food is stopped; you can also set the feed table positioning feeding, check the daily eating situation, in order to adjust the amount of feeding to prevent waste. The daily feeding amount is about 5-8% of the fish's weight. The crude protein content of the artificial compound feed should not be less than 40%.
4. The daily management of dietary protein content of the moonfish is quite high and it is easy to cause high ammonia nitrogen concentration in the water body. Especially in summer, when the water temperature is high, it is prone to nitrogen odor, which is extremely harmful to the growth and development of Yueshao, and even causes a large number of deaths. Therefore, it is necessary to control the water quality, change the water frequently, keep the water in the pool light green, keep the water fresh, and strictly waterproof. Black, smelly. At the same time, to strengthen the management of feed, prevent food bastard deterioration, so that the bait "four set." Moons grow to more than 10cm, jumping ability to strengthen, especially in the rainy day or change the water, jump is very active, so we must do a good job of escape. It is required that the height of the pool from the water should not be less than 50cm. In the inlet and outlet, we must do a good job of anti-escape facilities. In the flood season, we must use high mesh around the pool. Observe the patrol ponds on a daily basis and carefully observe the monthly feeding and activities. Pay attention to changes in water quality and whether the facilities have been damaged. If any problems are found, they must be dealt with immediately.
5. Fish disease prevention and control of onychomycosis has strong resistance to diseases, and there are fewer diseases in the breeding process. However, we must adhere to the following prevention and treatment of fish diseases: (1) Mildly disinfecting water body with lime every 10-15 days; (2) Bacteria When sick, use 0.50.000001 furazolidone or 10.000001 bleach to spread across the pool; (3) parasites use 0.50.000001 crystal trichlorfon or 0.70.000001 copper sulphate, ferrous sulfate or 250.000001-400.000001 Ma Lin Quan Quan splashed; (4) Saprolegnia soaked with maltite green 20.000001 for 5 min.
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