Cracked crocodile!How many types can you recognize more than 660 foreign invasion species?

Wen ｜ Feng Zhao

A "strange fish" became an Internet celebrity.

Recently, a news of a news of a lake and a crocodile cricket in Ruzhou City, Henan Province rushed to the hot search. The live video was surveyed by more than 30 million netizens -in recent years, with my country's commodity trade and personnel exchanges. The spread of invasive species is more diverse and concealed. Once they find a suitable living environment, they will affect the local ecology and damage the sustainable development of agriculture, forestry, animal husbandry and fishing. A crocodile is one of them.

What effective measures should be taken to curb the damage to ecological environment and agriculture, forestry, animal husbandry and fishing?

Dry 200,000 cubic meters of lake water for the monster fishing fish

This summer, when the citizens of Ruzhou, Henan, when they played in the central park of the city, they found that there was a huge "black shadow" swimming in the lake. This strange fish was dark and nearly one meter, which was very abrupt in the translucent lake water. Later, more and more people noticed it.

Thinking of fewer and fewer fish and shrimp in the lake in the past few months, citizens speculated that it might be related to this fish, so it initiated a report to the park management department and the forestry department. Subsequently, the park managers excreted the fishing team and tried to capture with fishing nets, but it was not successful. As a last resort, the park managers had to take nearly a month and dry more than 200,000 cubic meters of lakes, so that this rare local strange fish, the crocodile, surfaced.

Screenshot of CCTV News: Capture Crappers

Subsequently, many places reported the trace of crocodile crickets: Shenzhen Viewing Pond in Guangdong, and the crocodile crickets twice in the artificial lake; less or less ornamental fish in the release pond in Quanzhou, Fujian, captured a length of 1.2 meters long, weighing 25 meters, 25 weighing 25 Jack of crocodile crickets; the four crocodile crickets in the waters of Kunming, Yunnan have been successfully caught; the fish pond near Donghu Lake in Xining, Qinghai has lost more than 1,500 pounds of fish in half a year. The boy was playing by the pool, and was bitten by three fingers by the crocodile.

In fact, as early as 2006, there were reports from the foundation of crocodiles in the waters of Guangdong. What kind of fish is this?

The killer in the water carries three "magic weapons" with you

Seeing the word "字", many people's first reactions are the delicious yellow croaks on the table. However, the crocodile town crickets are far away from the yellow cricket. Not only does it look like a snake, but also has thick scales, long kisses, and hard teeth. Essence

The kiss and teeth of the crocodile cricket

The crocodile crickets are native to North America. According to fossil analysis, they can be traced back to 100 million years ago. The generation of earth rulers who can "die" is because of the three "magic weapons" that they carry with them:

One is that the scales are as hard as iron. These scales have about one coin's thickness, so that large carnivorous animals are unable to lower mouth and difficult to deal with;

The second is that the fish eggs are toxic. The toxic substances extracted from half of the fish can put a lobster down. Even if the eggs of the crocodile can not poison a pool of fish, it is enough to make the predator not eat it;

The third is unique breathing. Crusadus can not only breathe with the cheeks, but also obtain oxygen with crickets. Even if you leave the water, you can maintain your life for a long time.

The crocodile cricket has a strong breeding ability and has almost no natural enemies. It is easy to cause devastating damage to local fish, known as "killer in the water".

However, in the past century, with the activities of human beings, the original freshwater area where crocodile crickets had survived were used to cultivate artificially. Candidate Crippy Crusades were considered to be a natural enemy of artificially breeding freshwater fish. As a result, it was endangered.

So, how does this large fish that cannot be mixed in the "hometown" enter my country?

Introducing China to destroy the aquatic ecosystem

When humans realize the need for species diversity and protect them in a timely manner, so that crocodile can not be removed from the earth.

The main ornamental varieties of the bird's family: spots, quarrels

During the protection process, people moved their eyes to the entire bird's family, such as slender and beautiful spots, and the black spots with golden bottoms of Mexican. Since then, the bird's family has become a pet from the freshwater area and has become a pet in the human fish tank.

It is recognized now that as a "ornamental fish", crocodile tadpoles entered China through illegal smuggling.

Later, due to the escaping and unscrupulous living farms, the witness records in the wild water body increasingly increased -this is like letting the tiger return to the mountain. After leaving the native land, due to the lack of checks and balances of the American crocodile and crocodile turtle, once the crisp cymbals have obtained large -scale reproduction of large -scale reproduction, It will prey in a large amount of local freshwater fish, causing the fish to disappear and the biological chain break; fish and shrimp dead after predation will contaminate the water quality, and it is even more unsuitable for other fish to reproduce.

Therefore, aquatic experts have reminded everyone many times to not release them blindly.

From the perspective of consumption, although the viscera and fish eggs of crocodiles are highly toxic, the fish has not found harmful substances, and theoretically eats fishy fish. However, the U.S. government has repeatedly suggested that fishermen should not eat to prevent poisoning. After entering China, with the changes in the living environment, it is difficult to evaluate how many harmful microorganisms and parasites carry this old and strong creature.

Therefore, it is recommended not to easily "be full of mouth".

Prevention and control problems with more than 660 biological invasion of creatures

my country is one of the countries with the worst harm to foreign invasion species.

The "2020 China Ecological Environmental Status Bulletin" shows that there have been more than 660 foreign invasive species, of which 71 of them have caused or have potential threats to the natural ecosystem.

For Fushou snails originally in China, the snails will bite rice leaf to reduce production, and feces will contaminate water quality. Because a large number of parasites are carried in the body, the seemingly fat Fushou snails cannot become the food on the table -there is no ripe snail meat. If you eat lightly, you will have diarrhea, and the nervous system will be harmful. It is difficult to enter. Brazilian turtle

Brazilian turtles produced in North America are raised by many families as pets. However, due to family abandonment, release, and breeding escape, Brazilian turtles in my country have increased geometrically, which seriously affects the survival of local turtles -they are also the culprits of Salmonella spread.

The large African snail native to eastern Africa can endanger hundreds of crops and not only have strong reproductive ability, but also the middle host of many people and animal parasites and pathogen bacteria. It is extremely harmful to eat, and even touch may be infected.

African snail

The Qing Daofu native to South America introduced China as an ornamental fish in the 1980s. They not only survived in harsh environments, but also had strong tolerance for high -acid and alkali water. They could survive even after being dried. Because Qing Daofu belongs to external skeletal fish, 80%of the body is bones, and there are almost no natural enemies.

Luo Feiyu, introduced from Thailand and Vietnam in the 1950s, was more popular in the Chinese market, but it became an invasive species in the wild. This is because the water quality of the wild fish in the wild is poor. The heavy metal ions in the water accumulate in the Luo Fei fish body, which leads to the wild Luo Fei fish that no one is willing to fish. After a large number of reproduction, local fish are suppressed.

Once foreign plants are brought into the country, it will easily cause diffusion.

Canadian yellow flower

After the purple stems are attached to the entry of automobile tires, they quickly spread in the southwest, and they are toxic, and mammals such as insects and cattle and sheep are not allowed. Plants compete for nutrition and secrete harmful substances, causing the surrounding plants to wither and die gradually; yellow -top chrysanthemums native to South America have more than 1,200 inflorescences, which can produce hundreds of thousands of seeds. North China Farmers and Nursers have caused serious threats.

Among the aquatic plants, Phoenix Lotus (commonly known as water gourd), which is originally produced in Brazil. In the 1960s, it was introduced to my country as a pig feed. A water gourd can breed 250,000 in 90 days, and it has now spread a quarter of the water areas of Fujian. The flood of the water gourd caused the water body to become black and smelly, and a large number of aquatic plants died.

Revolutionary grass

The native to South America (commonly known as the revolutionary grass), which is native to South America, is eating and drought, and the reproduction is rapid. Aquatic revolutionary grass will block the channel and grow full of ponds, leading to hypoxia; revolutionary grass in the dry field will affect crop growth and compete for nutrients and space.

Formulate method classification and effective governance of species

At present, although the crocodile crickets have not yet been officially included in the "List of Chinese Foreign Invasion Species", they have been mentioned many times in documents on response to foreign invasion species.

Water hyacinth

In January 2021, the Ministry of Agriculture and Rural Ministry, the Ministry of Natural Resources, the Ministry of Ecology and Environment, the Customs Administration, and the State Forestry and Cao Bureau jointly issued the "Further Strengthening the Prevention and Control Work Plan for Foreign Species", which clearly mentioned the "strengthening the aquatic foreign species breeding link Supervision, promote the comprehensive governance of migrants such as water gourds, Fushou snails, and crocodile crickets.

Since the beginning of this year, the Ministry of Agriculture and Rural Affairs has conducted national census on 10 migrant aquatic creatures, including crocodile crickets. "The Ministry of Agriculture and Rural Affairs has set the crocodile crumper as a foreign invasion of species, but it has to be investigated for two years to issue a new list of new invasive species." Said Shi Jun, a senior agronomist at the Guangxi Aquatic Research Institute.

The "Administrative Measures for Foreign Invasion Species" formally implemented in August this year clearly stipulates that any unit or individual shall not introduce, release or discard foreign species without approved. If it is not approved and is introduced, released, or discarded foreign species without authorization, the relevant departments of the people's government at or above the county level shall order foreign species that will be arrested, retrieved or discarded in accordance with their duties, and shall be fined 10-50,000 yuan.

Fushou snail

"In the next step, it will accelerate the implementation of foreign invasion species in farmland, fishery waters, forests, grasslands, wetlands, and main entry ports to find out the number, distribution range, and harm of the types of foreign invasion species. Guide to prevent and control, clarify key periods, key areas and main measures, and take comprehensive measures to effectively control foreign invasion species. "The relevant person in charge of the Ministry of Agriculture and Rural Ministry said.

At the same time, we should increase its blow to smuggling trade, and to informs illegal entry from the source from the source; strengthen market supervision, seriously investigate and deal with the trading behavior of foreign invasion species, and trace the source of foreign invasive species; it is strictly forbidden to foreign Invasive types of types of objects, contact the wildlife protection department in time, and hand over foreign species that do not want to raise to professionals.

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