With the development of China's economy, China's foreign exchange has become more and more common, followed by more and more exotic species in China. Some exotic species have entered China with humans unintentionally. For example, the seeds of some plants will attach to human clothes and then become invasive species, or follow human vehicles to China. Some of them were intentionally introduced by China, and some of them caused great harm and became invasive species, such as Ampullaria gigas. At first, it was introduced as an artificially cultured aquatic product, but it was finally found to contain a large number of parasites, so it was forbidden to be cultivated and sold, but Pomacea canaliculata began to flood in the wild in China.

But not every alien species will have a great negative impact. There are many alien species that are harmless, but there are many benefits. For example, the mosquito-eating fish is such an exotic species. It is very small and basically has no edible value, but it can devour mosquito larvae, so it has been introduced by countries all over the world. In addition, many fish have been introduced to China, which is a good thing for foodies in China and can satisfy their appetite. The fish to be introduced today was found in the Yellow River valley. It looks strange, but experts say it is a good thing that this fish appears in the Yellow River.

This kind of fish looks a bit strange, unlike local fish. It has a reddish-brown longitudinal pattern along the side line, just like a rainbow. This kind of fish is about 30 cm long, with dark green or brown back and snowflake spots on its fins. Many fishermen have never seen this kind of fish, but later they took it to ask experts in this field, only to know that this kind of fish is called rainbow trout and is an "outsider". It originated in the United States and was later introduced to North Korea.

Rainbow trout is one of the most precious fish in the world. It tastes very good, the meat is tender, there is no thorn, there is no fishy smell, it is easy to cook, and the taste is extremely delicious. It tastes like chicken and is nutritious. It is called the treasure of fish. In the international market, rainbow trout is also very expensive, which is one of the reasons why experts say this is a happy event. The price of rainbow trout is not low, and so is this fisherman. It is a good thing that rainbow trout appears in the Yellow River basin, because the living conditions of rainbow trout are very harsh, and it cannot survive in areas with poor water quality. The appearance of rainbow trout in the Yellow River naturally means that the water quality of the Yellow River has improved, which is certainly a good thing.

Rainbow trout is a very friendly alien species. It has a mild personality and will not cause great harm to local fish. Moreover, it has high requirements for water quality, so it will naturally not be submerged. On the contrary, it can be regarded as a water quality tester. If rainbow trout appears in any water area, it basically proves that the water quality in this area is very good, so for many places. The arrival of rainbow trout is naturally very popular, and experienced fishermen are even more delighted with the arrival of rainbow trout. If you can catch more such fish a day, you can make a lot of money.