CATDOLL : CATDOLL: What is the matter with the light-irrigated fry of American bigmouth mullet?

1. What is the matter with the light-irradiated fry of American bigmouth mullet?

At this stage, the American mullet is not very demanding on light, and the fry with yolk sac can grow in a completely dark environment. At the fingerling stage, using a striped tarp to block the sunlight can also achieve normal growth rate.

2. A good breeding model brings good returns. What is the clam breeding model?

Clam farming starts with seedlings. After sowing, the distribution of seedlings should be checked in time. Seedlings that are too dense, too sparse, or partially dead should be replaced in time. Clam farming starts with planting. After 6 to 7 months of cultivation, the seedlings will grow larger, eat more, and have stronger resistance to enemies. The seedlings should be moved to the low tide area to accelerate their growth.

Clam farming should be done well in disaster prevention. Preventive and rescue measures should be taken in areas susceptible to typhoons, floods, extreme heat, oil spills and other pollutants. Harvest in advance or move to safe sea areas before the typhoon arrives. After the flood, the covered mud and sand should be cleaned up in time, and the scattered clams should be collected to reduce losses. (IV) Clam farming should be prevented from enemies and pests. During the cultivation period, regular inspections should be carried out to remove serious enemies in time. Monitor water temperature and water quality, measure water temperature every morning (6:00) and noon (14:00), and observe water color. Daily water storage is mainly based on water quality. The pH value in the pond should be controlled between 7-8, the dissolved oxygen should reach more than 4mg/L, the water color should maintain a relatively ideal yellow-green color, and the transparency should be controlled at 20-40cm. Clam farming should be sampled and measured regularly.

Take samples every half month, measure and observe their growth. If clams are found to be too dense or locally accumulated, they should be evacuated and fed in time. As long as the conditions are good, clams rarely migrate. Feed management for clam farming. The main thing is to cultivate the biomass of feed in the pond. In early spring, spray the whole pond with fresh fish and shrimp paste to increase the organic debris in the pond. Use compound fertilizer and organic fertilizer water on sunny days in summer and autumn; in late autumn and winter, use soybean milk to feed the whole pond.

Prevention and control of clam farming diseases. Use quicklime (10kg/mu) or chlorine dioxide (0.125kg/mu) and other drugs to disinfect water and prevent diseases every month. The princes that block enemies and prevent escape are generally 1.2 meters high and buried 0.2 meters below the surface of the beach, but they must be checked frequently and repaired in time if they are dumped or damaged. After each drainage, the beach should be carefully checked for invasion of enemies such as blue crabs. Once found, the enemies should be removed in time. Cultivating clams can prevent intestinal protozoa from growing on the beach.

When breeding clams, you must pay attention to catching seedlings and check the distribution of seedlings in time. When the seedlings grow larger, their food intake increases, and their ability to resist coagulation damage increases, the seedlings can be moved to low tide areas to accelerate their growth. You must also pay attention to the impact of natural disasters such as typhoons and floods on clam seedling breeding. You must take preventive and rescue measures, and pay attention to avoiding excessive density of clams and local accumulation. You must evacuate and raise clams in time.

It mainly adopts centralized breeding method, which requires choosing a suitable farm, and then changing the water source regularly. It needs to feed some feed in time, and it is necessary to choose some feed with more comprehensive nutrition. It is necessary to constantly learn planting methods, so as to improve efficiency.

The breeding mode is mainly based on artificial breeding mode, which is relatively reliable and can make the breeding effect better.

The breeding model needs to be managed more strictly, and it is necessary to learn breeding techniques, ensure breeding skills, and conduct regular inspections.

3. A large number of starfish have appeared in the waters near Qingdao Jiaozhou Bay recently. What impact does the presence of starfish have on breeders?

According to domestic media reports, a large number of starfish have recently appeared in the coastal waters of Jiaozhou Bay in Qingdao, Shandong, which has had a great impact on local aquaculture farmers. Since starfish mainly feed on shellfish, local clam and oyster farmers have suffered very serious losses. Local farmers have spontaneously organized themselves to catch starfish in the sea. Although there has been a certain effect at present, for the farmers, their losses have already been caused. How to resume production as soon as possible to reduce losses is what they need to consider next.

At the local fishing port, you can see many fishing boats continuously catching boatloads of starfish from the offshore waters, and these starfish are then loaded and shipped away by trucks waiting at the dock. Local fishermen said that each fishing boat can catch thousands of starfish a day in recent days, which has also aroused the interest of many starfish buyers. They wait for the return of the fishing boats at the local dock, and quickly purchase the starfish and take them to the local seafood market for sale.

Local fish farmers said that starfish appear in the Jiaozhou Bay every year at this time, but the situation this year is rather abnormal. There haven't been so many starfish in the Jiaozhou Bay for many years, because it is now the season for releasing clam seedlings, and the appearance of starfish means that even if the clam seedlings are released, they will be quickly eaten by the starfish. In order to minimize the losses, farmers have organized manpower and fishing boats to catch starfish. At present, with the continued fishing, the number of local starfish has been under control to a certain extent.

Local seafood researchers said that the large number of starfish this year is related to changes in the marine environment. Since the starfish larvae have adapted to the changes in the environment, the survival rate of the starfish larvae is very high. In addition, starfish have the characteristic of gathering in food-rich sea areas, so the number of starfish in the breeding area this year is very large. At present, there is no particularly effective means to solve this problem, and artificial fishing can only be used to temporarily alleviate this phenomenon.

The impact is particularly large. Starfish occupy some resources in the sea, which may cause heavy losses to farmers.

This is because most of the farmers grow clams and oysters, and starfish, as "sea locusts", eat almost all of these farmed seafood, causing the farmers to lose a lot of money. Even if the caught starfish are sold, it cannot make up for the farmers' losses.

It may cause some harm to the seafood raised by farmers, affecting the production of seafood and causing economic losses.

For farmers, it can alleviate their economic pressure to a certain extent and reduce some losses to a certain extent.

4. What are the hot events?

1. Major strategic achievements have been made in the national fight against the epidemic

Faced with the sudden outbreak of the new coronavirus pneumonia, the Party Central Committee insisted on putting people and life first, and with firm and resolute courage and unyielding determination, led the entire Party, the entire army, and people of all ethnic groups across the country to quickly launch a people's war, a total war, and a blocking war for epidemic prevention and control, which took more than a month to initially curb the spread of the epidemic, and it took about 2 months to control the daily number of new local cases to single digits. It took about 3 months to achieve decisive results in the defense of Wuhan and Hubei, and then fought several local concentrated epidemics in succession. We have won major strategic results in the national anti-epidemic struggle and fully demonstrated the Chinese spirit, Chinese strength, and Chinese responsibility.

2. The Civil Code was born to better protect the rights and interests of the people

On May 28, the Third Session of the 13th National People's Congress voted to pass the Civil Code of the People's Republic of China, which will come into effect on January 1, 2021. The Civil Code systematically integrates the civil law norms formed in the long-term practice over the past 70 years since the founding of New China, and draws on the beneficial achievements of human rule of law civilization construction. It is the first law in the history of New China named "Code". It has Chinese characteristics, embodies the characteristics of the times, reflects the will of the people, responds to new situations and new problems in economic and social life, and is conducive to comprehensively strengthening the protection of various civil rights of the people and promoting the further maturity and perfection of the legal system with Chinese characteristics.

②Hong Kong Financial Secretary: Two working groups have been set up to promote land and housing supply and speed up land and housing construction. Hong Kong Financial Secretary Paul Chan Mo-po published an essay on the Hong Kong Special Administrative Region Government website, saying that in order to continuously enhance Hong Kong's development momentum and effectively resolve people's livelihood concerns, land and housing are important and urgent issues that need to be addressed. In accordance with the instructions of the Chief Executive, we have set up two working groups to promote land and housing supply in all aspects, in order to streamline procedures, strengthen the overall coordination of cross-departmental work, further speed up, improve efficiency, and increase volume, speed up land and housing construction, and promote diversified development.

③ The administrative penalty decision on Alibaba, Tencent and others was announced. Recently, the State Administration for Market Regulation made administrative penalty decisions on 28 cases of illegal implementation of concentration of operators without reporting in accordance with the law in accordance with the Anti-Monopoly Law of the People's Republic of China. Among them, there are 5 cases related to Alibaba and 12 cases related to Tencent Holdings.

④ "White mud ants" invaded Qingdao waters in large numbers. Hu Dashan, a fisherman at Qingdao Jiaozhou Yinghai Wharf, caught more than 1,200 kilograms of starfish, "white mud ants" and other pests in his own breeding area. Two-thirds of his more than 5,000 mu of clam seedlings were devoured by these pests, which means a loss of millions of yuan.

⑤ Many scenic spots and museums in Xi'an have resumed opening today, and many commercial complexes have resumed dine-in services and full operations. The Qin Shihuang Mausoleum Museum, Xi'an Forest of Steles Museum, Shaanxi History Museum and other tourist attractions have announced that they will resume receiving tourists today. In addition, many commercial complexes in Xi'an have announced that they will resume dine-in services and full operations from July 10.

⑥ A new recombinant swine flu virus has been discovered in China. Recently, a study pointed out that in China, the H9N2 avian flu virus is infecting pigs and recombining with the swine flu virus. Based on existing research, this virus strain has the potential to spread to humans and animals.