Summer is coming, because eating crayfish needs to wear gloves to peel, and it is not convenient to play with the attributes of mobile phones (mainly delicious), it has become a social essential food in this season. But recently, a hot search came to the top of the list, saying that crayfish belong to invasive species, which is absolutely the biggest insult to food!
Today, crayfish are on the top of hot search again
However, the reason for crayfish's hot search is that it is listed as the second serious invasive species in the list of invasive species from outside Yunnan Province (2019 Edition). This is also the first provincial list of invasive species in China.
Food people did not expect, the price is not cheap, summer night essential crayfish, unexpectedly was listed as an invasive species, this can be regarded as' the history of the most miserable invasive species'
Compared with other invasive species, such as Blattella Americana, Pomacea canaliculata, bullfrog, crayfish is undoubtedly the most 'miserable': 'you people eat them every day, and the price is soaring. Do you want me to invade? "
Netizens have also signed up to help eliminate 'invasive species':
Many netizens also said that the main reason why crayfish have not been eliminated is that the price is too high
However, you may think simply that invasive species can not be 'wiped out' by eating. Crayfish has great destructive power on other aquatic species and dams, affecting the ecological environment.
Procambarus clarkii (crayfish) is native to northeastern Mexico and central and South America. It was introduced into China in the 1930s and 1940s, and gradually spread to Beijing, Tianjin, Hebei, Hunan, Yunnan and other parts of the country through artificial breeding and natural diffusion. The invasion of Procambarus clarkii has brought serious impact on the ecological environment and national economy of China, resulting in the loss of biodiversity in the introduced area, and competing with indigenous species for food, habitat and other resources, which seriously threatens the survival of indigenous species.
It is not news that crayfish has become an invasive species. As early as 2010, crayfish was listed in the list of China's second batch of alien invasive species designated by the Ministry of environmental protection and the Chinese Academy of Sciences.
On May 7, 2013, China News Agency reported an incident of crayfish invading the channel of Dianchi Lake in Kunming, Yunnan Province
Due to the continuous rainstorm in Kunming, a large number of crayfish appeared in Panlong River of Kunming. Crayfish not only invaded the important rivers into Dianchi Lake, but also "wormed out" the terraces in Yuanyang, Yunnan.
It is understood that crayfish can harm indigenous species by preying on local animals and plants, carrying and spreading pathogenic sources, etc. at the same time, its burrowing habit has a destructive effect on water conservancy projects, which may seriously lead to Levee breaking, flood and other dangerous situations.
Du Lina, who once participated in the project of the Kunming Institute of zoology of the Chinese Academy of Sciences on the comprehensive investigation of the distribution range and population of crayfish in Dianchi Lake Basin, said: 'the invasion of crayfish in Dianchi Lake can be traced back to 2000. A villager in Jinning, Kunming, brought crayfish back from Wuhan to breed them, and then discarded them in Dianchi Lake because of the increase in the number of crayfish. In 2006, crayfish had been distributed throughout Dianchi Lake, including Tanglangchuan. It is mainly distributed in Caohai, the south of Dianchi Lake and the West Bank of Dianchi Lake
Du also told China news agency that the invasion of crayfish will seriously threaten the survival of Some Endemic Fishes in Dianchi Lake, or lead to their extinction.
However, "ecological killer" crayfish is difficult to completely eliminate. Du Lina said frankly: 'there is no effective way to control crayfish. We can only control their living range by cutting off and fencing. On the contrary, a large number of artificial fishing will expand the living space of the crayfish population, thus stimulating the crayfish to accelerate their breeding. "
Therefore, we should not think that invasive species can be solved by eating them. After all, we have eaten crayfish for so many years, but we have not eaten them out
Asian carp flooding in the United States, hairy crabs rampant in Germany, oyster flooding in Denmark, millions of crabs rampant in Cuba... In order to control carp flooding, Americans are willing to use power grids, dams and other 'big moves'. Australia even wants to inject herpes virus into Koi, but the effect is not as good as expected.
Therefore, the invasion of alien species is a serious matter. The eaters should not catch a large number of fish by themselves, so as to 'eliminate the harm' for nature!