1, food is pollution-free. Catfish mainly feed on plants, such as aquatic plants and algae. Rich nutrition and no pollution. On the contrary, grass carp feed on small fish and shrimp, and the food contains harmful substances such as pesticides and heavy metals, so grass carp will be polluted.

2. The living environment is clean. Catfish live in clear rivers and lakes, the water quality is relatively clean, and catfish has less muddy smell. In contrast, grass carp's habitat is dirty, even living near the city's sewage treatment plant. Environmental pollution will affect the cleanliness of grass carp.