1. In the Stardew Valley game, caviar requires sturgeon roe. Breeding sturgeon will produce caviar. Put the sturgeon into the pond. Depending on the pond level, it will range from 3 to 10. Fish, if the pond is not full, will give birth first. When it is full, it will produce roe. It is harvested once a day or so. After receiving the roe, it is put into canning bottles to make caviar.

2. After the fish is thrown into the fish pond, the number of fish is limited, usually 3 at the beginning, and will reproduce automatically later. When the fish pond is full, an exclamation point will appear above it. That is the fish asking for fish pond tasks. Each time the fish pond task is completed, the number of fish ponds will increase accordingly, until 10.