Can a fish survive in a sewer? The answer is yes, and there is more than one. In our country, there are two typical fish that can survive in sewers: the mosquito fish and the catfish. We first simply feed the fish, as early as 1913, Taiwan, China, for the first time from the United States to introduce a fish, introduced for the purpose of mosquitoes, it was once popular, eaten fish, eat fish, also because it has a disproportionate called "big belly", eat fish is very popular, because the early 20th century, it was called the United States of America "anti-mosquito hero".

Later, in the 1920s, the mosquito fish was introduced from Taiwan to southern China, and since then, the mosquito fish has settled in China. However, through scientific research, the mosquito fish is not as the United States said, "mainly to mosquito larvae for food", but mainly to the plankton for food (most commonly copepods and branchiostoma), for mosquito larvae, which is only second. However, in the context of the world have introduced, no one paid attention to eat fish is really the master of the mosquito, so the adaptability of the mosquito fish is very strong, feeding ability is very complex, breeding ability is very strong mosquito fish has successfully entered the country's wild water bodies, and began to slowly squeeze similar ecological position of the fish's living space, become an "invasive species".

Even today, they can still be found in wild water and even in sewers in some areas. As early as January 2014, Qianjiang Evening News reported that mosquito fish are the most resilient economic fish, able to adapt to very harsh environments, including "extremely dirty" sewers: In downtown Wenzhou, a municipal garden construction company was dredging a sewer pipe in a residential area when it suddenly cleaned up five live catfish, the size of which varied little, the largest of which was a catfish. There is no difference, the largest of them is 80 centimeters long and weighs about 4 kilograms.

Catfish live in two main types of water: fishponds and natural water bodies. In both types of water, catfish prefer to live in the middle and lower layers. However, if you look closely at the manhole covers in cities, you'll notice that sewer, electric and storm water are separate pipes. Electricity pipes usually don't carry water, while sewage generally has a separate system that needs to be put into a wastewater treatment center to meet discharge standards.