Piranha, also known as Piranha Pomfret, this fish from the Amazon River in South America recently "hot" very much. Known as the "water wolves" piranhas in Guangzhou, Nanning and other places in the pet market soon after the appearance of experts warned: piranhas once flow into a certain watershed to reach a certain size, they may be a large number of "massacre" in the water of other fish, to the local ecological balance to bring about a serious crisis, resulting in a serious crisis of the ecological balance. This will bring a serious crisis to the ecological balance of the area and cause incalculable losses. Relevant provinces, municipalities and ministries have issued notices on the collection or destruction of piranhas, and Beijing has imposed a fine of 50,000 yuan for each piranha sold. The State Administration of Fisheries and Fishing Harbor Supervision issued another urgent notice today, asking fisheries administrative authorities around the country to investigate piranha strictly. Experts are worried that the already frequent invasions of alien species will once again be staged in China. What is invasive alien species? Park Chengshou explained that invasive alien species has two meanings, first, the species must be foreign, non-native; second, the alien species can settle in the local natural or man-made ecosystem, reproduce and spread on their own, and ultimately significantly affect the local ecological environment and damage local biodiversity. Invasive alien species can disrupt the naturalness and integrity of landscapes, destroy ecosystems, jeopardize plant and animal diversity, and affect genetic diversity. To address the issue of invasive alien species, mankind has now adopted more than 40 international conventions, protocols and guidelines, and more concordats are in the works. Park Chengshou said, pomfret is an exotic species, but it will not destroy China's biodiversity in the end still need to research departments to carry out a lot of investigation and research to come to a conclusion, but the invasion of foreign species is indeed China's biosafety of the enemy. Our vast territory makes us vulnerable to invasive species, and most alien species from all over the world may find suitable habitats in our country. Invasive alien species include plants, animals and microorganisms. Experts have pointed out that invasive alien species can now be found in almost all ecosystems in China, including forests, agricultural areas, waters, wetlands, grasslands and urban residential areas, with aquatic ecosystems being the most serious. At present, there are about 37 invasive alien animal species and 90 invasive alien plant species in China. Invasive alien species have caused considerable harm to China's ecological environment, biodiversity, society and economy. The cactus genus from America introduced at the end of the Ming Dynasty formed dominant communities in the coastal areas of South China and the dry and hot river valleys of Southwest China, where the original natural vegetation landscape has been difficult to see. The invasion of exotic pests and diseases has led to serious disasters. The pine mealybug, native to Japan, invaded the south of China in the early 1980s, and by the end of 1990, 130,000 square kilometers of pony-tailed pine forests had withered. ...... Experts from the Biodiversity Working Group of China's Council for International Cooperation on Environment and Development (CICED) once published an article that said that, perhaps in order to make a profit from agricultural profit from agricultural production, or perhaps a belief that the public prefers flower varieties from some distant part of the globe ...... Some people introduce non-native species into new habitats for economic purposes, but before doing so, they ignore the side effects of the introduced species. This panel of experts also points out that exotic species are introduced for economic gain, but end up with staggering inputs. There are already more than 50,000 exotic species in the U.S. While harmful invasive species make up only a small portion of this population, the negative impacts they cause are staggering. Each year, 700,000 square kilometers of wildlife habitat in the United States are encroached upon by exotic weeds, and the economic losses due to invasive species amount to $123 billion annually.