A tricycle in China carrying fish pods filled with gold fish was seen in Nanjing in 2011. The golden creatures were sold for a few yuan each, depending on their size and relative rarity. Buyers carry their new pet home in a small plastic bag. They can also buy fish food.
Selling goldfish and other small animals off tricycles was common in China until 2018 or so. Today, these paddle pet shops are a rarity in the big cities, but they are still common in the countryside. The seller in Nanjing was in a popular spot doing good business. I remember seeing many kids buying goldfish, and some of the tanks were already empty when I took the picture.