This guide will let you know how to sell fish in The Sims 4.
1. First, you will need to go to a canal to catch a fish using fishing tools.
2. After that, wait some moments till you catch a fish then open the inventory and select the fish you want to sell.
3. Click on the tickmark when asked to sell this item. The amount will be credited to your sim account after that. You can also sell a stack of items at once.