noun
goldfish peddling; goldfish peddler
Refers to both the act of selling goldfish and the person who does it. The context usually makes the meaning clear.
昔、金魚売りが町を歩きながら金魚を売っていた。
Long ago, goldfish peddlers walked through towns selling goldfish.
夏祭りで金魚売りの屋台を見かけた。
I saw a goldfish-selling stall at the summer festival.