A survey of the artificial breeding of jellyfish There was a poet named Shen and Qiu in the Song Dynasty. In a poem describing the jellyfish, he wrote: “Having a quarrel like a floating poultry, and a complex as a must, the chaos and the chaos do not work. Group of shrimps," This poem vividly shows the shape of the sea otters. It's like a big jar that floats down and it's like a round hat. As a low-grade invertebrate animal, its breeding and life history countermeasures have a certain academic value. Under what circumstances does it carry out sexual reproduction and how does sexual reproduction occur? The development of its embryo becomes a process of leeches, and the process of leeches turning into jellyfish again, you want to know. Today we invited Wei Jin, deputy director of Tangshan Aquatic Products Station. Next we will take a look at the whole artificial breeding and breeding techniques of the jellyfish. Many people have eaten jellyfish, but they do not necessarily know what the jellyfish is. Actually, Amaranthus is a large warm-water jellyfish that grows in the ocean. With the evolution of biology, the animation is of interest in the Cambrian period about 1 billion years ago. The fire of life gradually formed a prairie fire. In the late Sinian period of ancient times, in the vast sea, single-celled organisms and some multicellular invertebrates, such as sponges, coelenterates, worms, etc., have been living. The ancient marine coelenterates of sea otters floated in the ocean of the Cambrian era as early as 500 million years ago. In China's Hubei Province, Zigui County, Duck Lake, Tianying Lake and Wunni Lake, among these pools, the natural appearance of sea otters has been around for 100 years. The escarpment belongs to the coelenterate phylum and the scorpion scorpio, Root mouth water head, root jellyfish, jellyfish. Begonia's body is divided into an umbrella and an oral shank. Umbrella high, super hemispherical, thick rubber layer. The movement of the jellyfish mainly depends on the circular muscles of the inner umbrella to relax and contract rhythmically. When the circular muscle contracts, the seawater in the lower chamber of the umbrella is squeezed out, and the reaction force is used to push the carcass forward toward the top of the umbrella. The movement of the sea otters continues day and night, and the swimming speed of adults in the still water is 4 to 5 meters per minute. Explaining the point of interest The ancient ocean jellyfish jellyfish, there is also a little known superb skills, this is his very sensitive hearing. It was originally on the eight tentacles of the Haishu. There are many small balls and there are gravel-like auspices in the small sphere. This little audible stimulus to the nerve receptors on the wall constitutes the hearing of the jellyfish. This peculiar hearing can hear sound waves of 8 to 13 Hz that people cannot hear. It is by relying on this skill that the sea slug can predict the arrival of the sea storm in advance more than a dozen hours. This also reduces the friction between the top of the umbrella, which is intimacy and softness, and the wall of the pool, prolonging its service life. If the source of intimacy is not from the sea, but full artificial cultivation is used, pools with smooth pool walls must be constructed in order to cultivate sexually mature parents. This can not only effectively increase oxygen but also save costs. From the point of view of the life history of the sea lice, sea otters are alternate generations of generations, the jellyfish type has asexual generation leeches type through the reproduction, the nymph type breeds the generational jellyfish type through horizontal rift reproduction, the jellyfish type estuary lives, the leeches type camp lives, the early leeches Larvae, with four tentacles, body length 0.2 to 0.3 mm marked, fully developed in 20 days, the tentacles of the juvenile larvae is a predatory organ, the mouth is very small, less than 1 mm when the living state is expanded, the labeling can only take small plankton biological. The juvenile larvae are large in quantity, and the ingestion activity continues day and night. After a full stomach, it takes 4 to 5 hours for food to be digested. Cultivating zoea is an important stage in the artificial breeding of sea lice. The main technique for culturing zoea larvae is to feed and change water at the right time and promote the normal development of early zoea (4 tentacles). The jellyfish's larvae need to be attached to the appendages. What are the requirements for culturing? Compared with fish, shrimp, shellfish and algae, there is no special requirement for sea bream nursery. Precipitated seawater, even without sand filtration, can be used with timely feeding to increase seedling volume. The best food 240415 for the early zoea larvae is the larvae of the larvae and shellfish, and the main bait is Artemia nauplii. The device for hatching Artemia and the corresponding 243023 heating, temperature control, and aeration equipment are mandatory. Indispensable. Feeding time should be started 4 to 5 days after the seedling attachment, once a day, the amount of bait is estimated to be more than 5 times the seedling amount, and the area method is usually used for sampling and quantification 18 39 13 . At present, the amount of gravid larvae (16 tentacles) reared by large water bodies is calculated with the area of ​​seedlings, which can reach 10,000/m2. After the larvae have been quantified, the pool should be poured and the water should be changed in due course. The zoea larvae have small individuals, little movement, low oxygen consumption and less metabolites. When the water temperature is low, the metabolism is slower and there is no need to change the water frequently. Generally, changing the water after each feeding can be 1/3 to l/2. Slowly put the filter into the pool, and use the siphon method to aspirate the seawater with sediment from the bottom of the pool. Here you must pay special attention to the fact that while sucking, the water will stick to the wormlike body around the filter to avoid It died of suffocation, and then added the same amount of fresh seawater. In order to prevent the growth of the algae, etc., on the seedlings, and improve the survival rate of the zoea, it is beneficial to the reproduction of the pods. Pay attention to control the luminosity. The third is timely feeding. Artemia nauplii as bait, depending on the water temperature depending on the number of feeding. Generally, it is not fed at 5°C or fed once a week for 4 weeks; it is fed once a week at 6-10°C, and fed twice a week at 11-15°C. The amount of bait is 10-20 times the number of zoea. The juvenile larvae are orange after satiation and pale when they are hungry. Therefore, the number of feedings and feeding amount can be increased or decreased according to the shade color of the juveniles. Also pay attention to keeping the temperature low. Zoea larvae adapt to low temperature life. Long-term life at 10 ~ 15 °C deformed individuals increased to below 10 °C, above the freezing point is appropriate. At the end of the fall, the water temperature in the pool falls below 16°C. By the end of the winter, there should be thermal preservation facilities in the room so as to keep the pool water from thick ice (prevent cracked concrete). When the indoor water temperature exceeds 10°C in spring, measures should be taken to reduce the temperature, or increase the number of water changes so that the indoor water temperature approaches the natural sea temperature until the temperature of the natural sea area rises to 13 to 15°C. In this regard, it should be specifically stated that the juvenile larvae have no economic value in use. It must be reproduced through transverse fissures and the illustrations can only produce jellyfish-shaped larvae. This is the only way to acquire the seed needed for artificial breeding. Therefore, the cultivation and management of the butterfly are related to the success or failure of artificial breeding. Alas, the butterfly larvae, which are fully formed but not yet released, frequently flutter. The process of formation of butterfly larvae at the top of these otters looks like anemone, animating them ready to turn into something else. When they are separated, they become tiny sea otters. Its scientific name is called butterfly larvae. As the larval larvae are released, the rift below them is transformed into butterfly larvae. The tentacles regenerate on the parental zoea under the last rift. When all the butterfly larvae are released, the zoea form is restored. The zoea can reproduce transverse fibrogenesis multiple times. In order to obtain concentrated large batches of butterflies, artificial heating methods can be used. The primary dish-shaped larvae are colorless, translucent, and grow by 15 to 20 days, with an umbrella diameter of about 20 millimeters, which is a larvae. The primary discoid larvae are not yet developed, and the planktonic ability is very weak. Most individuals settle in the pool bottom and must agitate the water body. Micro-inflating methods are generally adopted to promote its floating, feeding and growth. Subtitles under artificial control conditions, the survival rate from the dish to the juvenile stage is generally more than 80%, the survival rate of the pups stage can reach more than 70%. It is necessary to pay attention to feeding and changing water for the cultivation and management of young cubs. Feeding times: Cubs 5 to 4 times/day, each feeding amount was calculated as Artemia nauplii, generally 1:500-1000. When cub, change water twice a day, every time l/3 ~ l/2. With the growth and development of larvae, the oxygen consumption and ammonia excretion rise sharply. Therefore, in the process of cultivation of jellyfish jellyfish, coupled with a long time of cultivation, some residual baits and feces are likely to spoil the water quality. Disease prevention is of vital importance. The lower limit of dissolved oxygen in the water body is 2.0 mg/l, and the pH value range is 7.5 to 8.5. The juvenile larvae grow to 1.5 to 2 cm and they can be released for stocking. Since the sea lice are relatively small and fragile, they should be handled with caution. Use precipitation first, and then use the net to remove the seedlings by hand. Avoid damage to the young quail as far as possible. After counting out, use a plastic bag and add water to flush oxygen into the foam insulation box. Selection and treatment of aquaculture ponds. Sea bream breeding generally chooses a prawn rearing tank or reservoir of 30 acres or more, with a water depth of 1.5 meters or more, a steep wall, and a relatively hard bottom. Before laying the seedlings, the bottom of the pond should be treated to prevent the bottom of the pond from corrupting and affecting the water quality, while preventing the growth of aquatic plants. 20-30 days before planting, should be fertilizer and water, usually 50 to 70 centimeters of advanced water in shrimp ponds, and 0.5 to 1 kg/mu of chicken can be applied. Zooplankton is cultivated in large amounts in the pool to ensure the food supply of the young jellyfish after entering the pool. Since the jellyfish are put into soil ponds, they mainly use zooplankton that are produced in water as food instead of feeding them artificially. Therefore, the amount of sea larvae to be planted should be strictly controlled. According to the difference in the survival rate of seedlings with different parachute diameters, the number of seedlings to be put on is different. The stocking density of juvenile jellyfish with an umbrella diameter of 20 mm or more is 100 to 150 heads/mu. The optimum temperature for juvenile jellyfish stocking is 18-20°C. The location of the breeding pond should be selected at the upwind outlet to prevent the young jellyfish from excessively concentrating on the poolside of the downtake to cause death. The jellyfish have a floating habit in the morning and in the evening. After the young jellyfish is released, the pool is patrolled every day from 5:00 to 7:00. When you grow into the patrol pool, you must also pay attention to observe the color of the water to judge the quality of the water, and the color of the water is light brown. The water quality is thin, and the zooplankton breeds slowly, affecting the growth of sea otters; the water quality is too fat, and it is easy to cause water and oxygen deficiency during the high-temperature period in August. Before the jellyfish umbrella diameter is 10 to 15 centimeters, the water level can be maintained at 50 centimeters, and then gradually increase. The sea bream floats in the sea and its body is soft and crystal. It is known as a parachute in the sea. Its upper body hemispherical umbrella part is commonly known as the jellyfish part after processing. The part that hangs under the umbrella part is the jellyfish head after processing. The jellyfish is in the mouth. There are many small tentacles on the top and there are many stinging cells on the small tentacles with needles on them. When the human body or small animals meet, he will release the venom of the needle. The jellyfish also uses it to capture feeding. The jellyfish are poisonous. Will eating jellyfish poison after eating? Begonia toxin is present in the secondary cells, but each secondary cell can only be made once. When the jellyfish are taken out of the sea, they are subjected to various stimulations. The barbed wire of the secondary cells has already been ejected, and the venom is washed away. With salt water treatment, water is removed and salt is washed after washing. Therefore, processed sea bream food is non-toxic and can be used safely. Haishu is known as the "Stone Mirror, Artificial Eyes, Public," with the sea-air freezing and condensing red jade crest, Xia Yi fading ice smashing China's reputation, China's earliest edible jellyfish in the Jin Dynasty, the Western Jinhua Zhang Hua's "Natural History" on this The record, but 95% of the jellyfish is water, so there is a saying called "a jellyfish, only half, sea oysters boiled, vanish into the sea" friends who love to eat jellyfish, we must pay attention to ah. Begonia is not only a delicious meal, but also known as a good medicine for treatment of diseases. According to the "Li Shizhen," the Compendium of Materia Medica, Begonia has the functions of detoxification, detoxification, removing blood stasis, and reducing edema, and it is also effective for bronchitis and gastric ulcer. There are curative effects. How can a sea otter with so many health functions be selected? Begonia is a large-scale edible root jellyfish that is distributed along the coast of China, and is also an important export aquatic product. It is rich in protein, sugars, vitamins and inorganic salts, and has high nutritional value. At the same time, Begonia has a high level of In recent years, due to the intensification of marine pollution and excessive fishing, natural and marine jellyfish resources have become less and less. Therefore, vigorous development of artificial breeding of jellyfish has broad prospects and market potential.


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