Catfish are often found to live in sewage, muddy water, smelly water and dregs water. In fact, this also shows the adaptability and disease resistance of catfish. Especially in places where other fish can't be preserved, the strange "outshine others" of catfish gives people a dirty impression. Catfish is a carnivorous animal, and it can eat carrion and even feces. Therefore, many animals in nature, such as the old, the weak, the sick and even the dead bodies, carrion and feces, can be used as food for catfish. But being able to eat doesn't mean eating only. On the contrary, catfish in nature mostly feed on small fish, shrimp and insects, but it is still difficult to escape people's characterization of its "filth".
Catfish looks "ugly", and subjectively people are more likely to associate it with "horrible" and "disgusting". "Scaleless fish" or some fine-scaled fish usually have more liquid, but it is just a shelter liquid, which has similar effect to large fish phosphorus. This is common to such creatures, and it is special without feeling catfish.
But as far as itself is concerned, catfish itself has few thorns, delicious meat, rich nutrition, appetizing and easy digestion. Every100g of fish contains 64.1g and protein14.4g of water, and contains a variety of minerals and trace elements, which is especially suitable for the elderly, children, people with weak health and malnutrition. There is a folk saying that catfish is lactagogue, so families with mothers often buy catfish. So it is biased to say that catfish is "trash fish". In fact, catfish is a common ingredient in many countries and regions of the world.