Many regions of China have characteristic aquatic products, and these characteristic aquatic products are an important part of the local ecological structure, but when some alien species enter, the threat to native species is quite large, sometimes don't look at some inconspicuous species, the persecution is greater.
Taihu silverfish must have been heard of, it is a specialty of Taihu Lake, in the market is particularly famous, but when other regions introduced it, it has become an "ecological killer".
Taihu silverfish as a specialty of Taihu Lake, in the Spring and Autumn Warring States period has been rich in the record, the development of the Kangxi years, it is often used as a tribute to the imperial court, which makes the Taihu Lake silverfish famous, many literati inkers are also specially to The Taihu Lake Wuxi, Suzhou, Huzhou and other places to taste the delicious taste of silver fish.
After entering new China, people's activities in using Taihu Lake were also increasing, and the catch of silver fish was also increasing day by day, and the new China at that time was due to lack of materials and food shortages. So these silverfish were mainly used for export, and the largest export country at that time was Japan. The Japanese people are looking at the rich nutrition of silver fish, and the flesh is delicate, no scales and no thorns, there is no fishy taste, plus Japan is a country that pays great attention to health, the calcium contained in each hundred grams of silver fish is as high as 760 mg, and the phosphorus is as much as 1000 mg, so it has the name of "fish ginseng" in Japan, and even a very exaggerated statement, a pound of silver fish is worth 20 kg of grain.
You should know that in the 70s, grain was still very scarce in China, and when it saw such a high value, various places also began to ponder whether they could introduce silver fish and create more foreign exchange for the local area. Because at that time, in addition to Japan, silver fish was also very popular in South Korea and some countries in Southeast Asia, so that there was also a silver fish economy, which led to the introduction of silver fish from all over the world.
Among them, the Nebula Lake in central Yunnan also introduced Taihu Silver Fish, when the introduction of Taihu Lake Silver Fish was only to pursue more economic benefits, because before yunnan Dianchi Lake because of the introduction of silver fish, only one species created 3500 tons of fishery production, but it should be known that the output of other fish in Dianchi Lake at that time was only 3000 tons. Therefore, there is also the practice of introducing Taihu silverfish from Nebula Lake.
Unexpectedly, the introduction of silverfish in Taihu Lake soon multiplied in a large number of nebula lakes, and by the late 1980s, it completely replaced the position of the traditional fish "top spot" in the local lake and became the most common fish species in heavy industry. The traditional fish of Nebula Lake have also quietly changed in this process, and the most native species of large head fish has been decreasing, even the local native crucian carp is also decreasing, and even some indigenous fish have reached the crisis of extinction. Some people even say that Taihu silverfish is simply an "ecological killer".
Why did the Taihu silverfish become such a situation after being introduced? This is because the lifespan of silverfish is only one year, when the broodstock give birth to juvenile fish will die quickly, generally after the first introduction will reach the first production peak in 2-3 years, after which it will be greatly reduced, or even zero production. Therefore, it is necessary to invest in juvenile fish again in the later stage, which is also a major reason why the production of Dianchi Lake is particularly large at that time. The eggs of the Taihu silverfish hatch earlier than the eggs of the native species, and when the gills of the silverfish begin to be active, the eggs of the native fish naturally become the food of the silverfish, which is why it will become an "ecological killer".
Not only Xingyun Lake, but also Dianchi Lake and Fuxian Lake have also experienced this situation, and the Amuta Fishery and Xingkai Lake in the north have also encountered the same situation because of the introduction of Taihu silverfish.
Although the Taihu silverfish has brought huge economic benefits to the local area, it is too much of a threat to the local water ecology, so when introducing a species, it must be carefully weighed.