Does anyone know what kind of fish this is?

Koi fish, originally an advanced ornamental fish, has great ornamental value and is deeply loved by people. Originally refers to the colorful carp, which has been deeply loved by the rich since ancient times. And this kind of animal is mostly raised by rich people, which in turn makes it richer and luckier.

Koi fish's life span is very long, ranging from 60 to 70 years old (according to legend, there is a 200-year-old koi fish), which means good luck. According to legend, it can bring good luck to the owner and is a popular feng shui fish and ornamental pet.