Up to now, there are so many countries in the world, and no country dares to say that it can properly deal with this problem, because these alien species do not have specific natural enemies, so it is difficult for them to be restricted from reproducing.
In this regard, some netizens may feel that they can solve it by eating. Indeed, many alien species that come to the mainland are served on the table because of their delicious and nutritious meat, and even some alien species need to be artificially bred to meet the needs of the market, but are alien species so easy to deal with?
Alien species that may be familiar to everyone include Brazilian tortoise, crayfish, tilapia, bamboo shoot fish, rohu, scavengers, alligator gar and so on.
Among them, crayfish and tilapia have corresponding breeding bases in China, which are representatives of the need to rely on breeding to meet market demand, but it still exists in the natural waters of many places in the mainland and has caused great harm.
Among them, crayfish have the habit of burrowing, and they have caused serious damage to the terraced fields of Yunnan, and the local villagers have tried their best to exterminate them.
As for tilapia, the mainland exports hundreds of millions of tons every year.
At the same time, in addition to these relatively well-known alien species, there are also some that we usually don't know much about, such as the exotic fish species zander that I want to talk to you about today.
In mid-February 2021, a fisherman caught a number of "strange fish" with slender bodies, sharp teeth, and pointed and long mouths while fishing in the Yellow River.
In late April 2021, when a fisherman from Shandong was fishing in a local river, he caught a few "pointed perch", because this fish has similar characteristics to perch, but their heads are relatively slender.
But
Zander, also known as Shidao black, small dogfish, toothfish, white barramundi, etc., is a perch of the perch family, with the appearance characteristics of the perch, but its body will be more slender than the perch, and it is also the same as other perch, the meat is delicate and delicious, and there are no intermuscular spines, and it has good nutritional value.
Zander is native to the central part of Europe, is the main economic species of perch, is also an important species of freshwater aquaculture, has a good breeding economy, so the mainland introduced zander from Russia in 1960, mainly into the Ili River, Balkhash Lake and Irtysh River system in Xinjiang.
In 1992, the mainland mastered the artificial breeding technology of zander perch, which also promoted a major process of zander in artificial breeding, and in 1993, zander began to be introduced into Shandong, Hubei, Beijing, Tianjin and other provinces and cities in the mainland.
In the process of captive farming, it is often difficult to avoid breeding escapes, which also gives zander the opportunity to enter natural waters, counting from their entry into the continent, it has been more than 60 years since today, is it because of their own defects?
As a predatory fish species, zander mainly feeds on other fish in the water body, belongs to the top of the freshwater food chain, and there are no fierce creatures like crocodiles in the natural waters of the mainland, so only the squid may be able to prey on it in freshwater, but the food source of the squid is very rich, and they do not need to only stare at the zander perch.
At the same time, zander has a very fast growth rate, the annual zander can reach a body size of about 500g, and the zander can better protect itself when it grows up, and the 2-year-old zander can reach sexual maturity, and they can lay 30~400,000 fish eggs at one time.
Since there is no specific natural predator, and at the same time it is so "able to live", and it is widely cultivated in many places on the mainland, and has entered natural waters for many years, why has zander not reached the "height" of tilapia?
What do you think about this?
Dear friends, the arrival of alien species, on the one hand, may indeed enrich the dining table of our people, but also contribute to a certain breeding economy, but their potential harm can not be underestimated.
Do you think there is a possibility that this kind of take is delicious and nutritious?