Mussels are a fish food item found in shallow Ocean in the Shipwrecked DLC. They appear as clusters of three oval shadows that the player can move towards in a Boat. In order to harvest them, the player can craft a Mussel Stick and wait a minimum of one day, then the Mussel Stick will be coated in Mussels. When harvested, this results in one, three, or six Mussels, depending on how long the player left the stick in the Mussel Bed. The Mussel Bed and stick are consumed by this. They can be used as an ingredient in Crock Pot recipes.
Alternatively, the player can sail over the Mussel Bed using a Trawl Net attached to the boat. This will consume the Mussel Bed and place 1 Mussel in the Trawl Net.
New Mussel Beds will spawn randomly to replace those consumed.
- When examining underwater Mussels, Wilson will say "I wonder if they're from Brussels." Which may be a reference to Men at Work - Down Under or Belgian actor Jean-Claude Van Damme, known as the "Muscles from Brussels".
- While anywhere from one to six Mussels can be harvested, the stick will always show three Mussels clinging to the stick regardless of how many can be collected.
- As of the Hang Ten! update, Mussels attached to the stick do not perish. The player can use this to their advantage, saving Mussels in the event of food shortages.
- The texture used for underwater Mussels is actually a slightly modified version of the Nightmare Fuel's texture.