‘金鱼’ literally means ‘gold fish’ — combining 金 (jīn), meaning ‘gold’ or ‘golden’, and 鱼 (yú), meaning ‘fish’. It refers specifically to the ornamental freshwater fish bred from wild carp, known for its bright orange, red, yellow, or spotted coloration and distinctive body shapes. Unlike wild fish, goldfish are domesticated pets commonly kept in bowls, aquariums, or outdoor ponds.

The term is used exclusively for this species and carries no metaphorical or idiomatic meanings in modern standard Chinese. It appears frequently in contexts related to pet care, childhood memories, traditional Chinese gardens, and art — where goldfish symbolize prosperity and good fortune. While the characters individually have broader meanings, together they form a fixed compound noun with no variation in word order or internal structure.