Catfish is dirty because the living environment of wild catfish is dirty. They can grow in water with poor water quality and even live in sewers. They will eat some dirty food, such as rotten food and even some rubbish. Moreover, there is a layer of mucus on their body surface, which feels sticky and gives people a dirty feeling. However, this statement is not accurate Because the water quality and food are clean and not dirty when cultured artificially.

First, catfish Why dirty catfish is a common fish, which is distributed all over China and is a famous food with good taste. However, some people think that catfish is very dirty, and even call it "the dirtiest fish in the world". The main reason is that the living environment of catfish is dirty. Catfish have strong viability. They don't have high requirements for the surrounding environment and can live in a very harsh environment. Catfish can grow even in a very dirty environment, even in a stinking ditch. Another reason is that catfish may eat unclean food, rotten food and even garbage.

Moreover, from the appearance, catfish is a scaleless fish, with some mucus on its body surface and looks dirty. These reasons are all important reasons why they are dirty. Recently, however, many catfish are raised artificially. They will live in relatively clean water, and farmers will change water regularly. Moreover, they eat normal food, not rotten food or garbage. These catfish are not dirty.

Second, why is catfish called trash fish? The reason why catfish is dirty has been introduced above. Catfish also has a name called "miscellaneous fish", which is basically consistent with their dirty reasons. First of all, because of their living environment, many catfish live in a very bad environment and the water quality is very dirty. It can almost be said that they live in garbage dumps, which is one of the important reasons why they are called trash fish. Another important reason is the food of catfish. Catfish are not picky eaters. They will eat dirty food, rotten food and even garbage, which is one of the reasons why they are called trash fish. Because they eat everything, some catfish have exceeded the standard in heavy metal monitoring.