The difference between pond turtle and catfish is: 1. Difference between families and genus 1. Catfish belongs to the genus Catfish of the family Catfish. 2. But the Tangchun belongs to the genus Catfish in the family Catfishidae. 2. Differences in mouths 1. An important feature of catfish is that their mouths are very large. 2. The mouth of the pond carp is not as big as that of the catfish, and is relatively normal in size. 3. Differences in beards 1. Adult catfish generally only have 4 beards. 2. But the adult pond turtle has 8 beards. 4. Differences in fish fins 1. There are no fins on the back of catfish. 2. The pond turtle has fins on its back. 5. Differences in living environment 1. Catfish has relatively high requirements for the surrounding living environment and likes to live in clean waters. 2. The pond carp does not have as high requirements for the surrounding living environment as the catfish, and they sometimes grow in relatively polluted water.