Species invasions occur in every country, such as China's water hyacinth, Australia's rabbit, The American wild boar, etc., so species invasion is a headache for many countries.
Although the mainland is one of the countries that have suffered more serious harm from the invasion of alien species, because the mainland has effectively managed these invasive species, it has not suffered as much loss as other countries, because every species that attempts to occupy China's territory has failed, but there is an invasive fish, which has been in the waters of the southern part of the mainland for 40 years and has not been recognized as an alien species.
The Merigara is considered a native species.
Wheat carp, referred to as wheat carp, is a kind of mud carp, likes warm water environment, mainly feeds on rotten plants, is not picky, grows fast, and has strong environmental adaptability, which can survive normally in reservoirs, lakes, ponds and rivers.
Because of its delicious meat, high nutritional value, with a certain economic value, and the mainland in 1982 from India introduced, and has been widely promoted and cultured, is currently in the mainland ponds are cultured, but also Hainan, Fujian, Yunnan and other places of important economic fish species, but no one thought that the original wheat carp now occupies the lower reaches of the Pearl River basin.
Because the Waters of the Pearl River have a suitable fish living environment, known as the paradise of fish, so in the Pearl River there are rich fish resources, including foreign invasion of wheat carp, in such a suitable living environment, the number of wheat carp has been developed at a high speed, even the mainland native fish are willing to bow to the wind, but also considered to be the mainland native fish - grass carp, in the Pearl River "mixed" like a fish in the water.
Mainland native fish and exotic wheat carp.
As one of the "four big fish" in the mainland, grass carp is widely distributed, and it is very similar in appearance to wheat carp, so many people are stupid to distinguish between grass carp and wheat carp, but if you observe it subtly, there are still many differences between the two.
First of all, in terms of body size, the grass carp native to the mainland is obviously a little larger, although the growth rate of wheat carp is very fast, but in the fish, the size is not small, but its weight is generally more than 20 kg, and our grass carp the heaviest can exceed 50 kg;
The second is the difference in the back, the back of the wheat carp is more bulging than the back of the mainland grass carp, and the color is also different, the back of the wheat carp is dark gray, the grass carp is tea yellow; and the color of the fish eye, the wheat carp is red, and the grass carp is monotonous black and white. The most obvious difference in the appearance of the two fish is that the body is in the same position, the color is different, and the living habits of the two fish are also different, such as grass carp likes to be cold, and wheat carp likes to be warm.
If you have never heard of wheat carp, then when you see it, you will naturally think of it as grass carp, but the economic value of grass carp is higher than that of wheat carp, so there has been a phenomenon of passing off wheat carp as grass carp in the market.
Alien invasions are terrible.
Each place on the earth has a different climatic environment, which also creates different ecosystems, and the formation of these ecosystems takes a long time, generally in units of 10,000 years, of which the surviving species are also preserved after many rounds of survival of the fittest, forming an interdependent and mutually contained stable ecosystem.
Once there is an invasion of alien species, it will seize the habitat and food of the same species, break the local ecosystem, threaten the survival of native organisms, such as the Brazilian turtle flood, not only compete with the native turtle for food, but also over-eat native fish and shrimp, fish eggs, etc., seriously endangering native organisms, directly causing serious damage to local biodiversity, so species invasion is considered to be one of the main reasons for the loss of biodiversity.
Nowadays, with frequent human activities, alien species invasion events occur frequently in various parts of the world, taking the mainland as of June 5, 2020, the mainland has found more than 660 kinds of invasive alien species, of which 71 species may cause serious harm to the continent, in short, species invasion events, must attract global attention.