Talk about jellyfish farming
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Jellyfish is a kind of jellyfish marine life. In addition to rich in high-quality protein, vitamins, carbohydrates and other nutrients, Jellyfish also contains various biologically active substances that are easily absorbed by the body. Due to the reduction of wild sea lice resources, the demand for sea lice in the domestic and foreign markets is continuously expanding. Breeding sea otters is becoming another shoal culture industry following shrimp farming, and the market prospect is very broad. The rise of jellyfish breeding has made the cultivation of jellyfish a problem for many farmers. At present, some people mistakenly believe that: "The culture of sea otters is simple and the conditions are very low. Sea otters have strong breeding ability, and have a short breeding time. They do not need to be protected from disease and have a considerable income." According to my own practice in the production of jellyfish culture, I would like to exchange ideas with the farming friends on the above issues: 1. It is not correct to say “artificially cultivated sea bream technology is simple and easy to implement†and it is easy to mislead farmers as sea turtles as a one-year life marine mollusk. The growth process is not complicated, but it is not as simple as scale farming. From the standpoint of raising seedlings, the cultivation of pro-growth, the promotion of ripening, the cultivation of floating larvae, pods, and platters is a relatively long process, and it is also a highly technical work. Non-professional nursery units are incompetent. From the point of view of artificial breeding, the survival rate of sea lice is currently only 10%. Because of its low survival rate, it is determined that the sea bream breeding must have adequate seed supply for a limited period of time. The sea otters have poor self-protection capabilities and often result in reduced production due to bad weather and predators. Therefore, the requirements for aquaculture environment are strict and the aquaculture technology operation is strict. For example, if shrimp ponds are used to raise oysters, the depth and area of ​​shrimp ponds are required to be deeper and bigger, and the existing shrimp ponds must be modified. Therefore, it is necessary to have good site conditions to earn large amounts of money by breeding sea otters, and the whole breeding process must be completed under the meticulous guidance of technicians. 2. With regard to the argument that “The sea otters have strong breeding ability, short breeding time, no disease prevention, and considerable incomeâ€, it is also quite scientific to say that the sea otters have extremely strict production requirements. Propagative ability means that the corpus callosum is horizontally split into discoids with a transverse ratio of about 1:8. The short breeding time refers to the development of commercial products for young females in about 60 days. It also refers to the time when the seedlings meet the conditions in which the optimum environment for sea bream grows and feeds and gains weight to reach the outlet specification under various conditions after investment. The said prevention of diseases is due to the rejection of various harmful sea lice survival factors in the body by the protective slime secreted by the sea lice itself, which is just an expression that remains on the surface. The considerable income refers to the result of achieving high yields under the condition of perfecting the management techniques of breeding. The conditions for ensuring high yield must be low salt, suitable temperature, adequate water exchange, abundant biological feed and strict farming techniques. 3. Precautions for breeding at various stages of the sea lice 3.1 The larvae should be selected in the size of about 2cm. The larvae should have good health and good vigor. When the weather is clear and there is no wind, the water temperature is about 19°C. This way the larvae adapt to the environment quickly and their survival is guaranteed. Some farmers do not have the ability to identify the quality of jellyfish seedlings. Therefore, care must be taken in the purchase of seedlings and transportation. 3.2 The size of the 15 day sea otters resembled the size of an egg. The diameter of the umbrellas was 7-8cm. They mostly gathered in the upper wind and floated to the surface in the evening. When swimming in the water, the tentacles stretch, the frequency of the umbrellas is high, and they are powerful and continuously feed on small plankton. The food is large and the body weight is about 60g. Within 15 days of planting, water quality must be meticulously adjusted to ensure adequate biofeed in the water. 3.3 The diameter of the jellyfish umbrella is about 15em in 30 days, which is basically visible in the whole pool. At this time, the seagrass is accelerating and the weight is above 1000g. There are three kinds of body color: white, dark red and purple. Appropriate addition of supplementary feeds will promote the rapid growth of sea lice. Farmers at this stage saw the results and often neglected management. Jimo, Shandong, a farmer caused a failure in breeding due to a change in substrate quality. 3.4 Forty-five days of jellyfish umbrella diameter is more than 28cm. The frequency of umbrella movement is soothing, and the weight is about 4000g. The whole pool is visible, and the winds are mostly in the wind, and they quickly dive after being disturbed. In addition to satisfying the preceding conditions, fresh water should be added in a timely manner at this stage. When the administrators patrol the pool, they will use the nettles to gently push the sea otters out of the net, so as not to damage the umbrella head and affect sales. 3.5 The 60-day jellyfish umbrella has a diameter of 35cm or more. The frequency of umbrella movement is slow and the body weight is above 8000g. At this point, the demand for water is increasing, and the tide will enter, and the large-entry and large-distribution will play a decisive role in stabilizing the sea otters that will be harvested. Jellyfish are harvested in 50-55 days or harvested according to customer specifications in good condition with good water quality, plenty of water, abundant feed, and well-managed conditions.