Mussels are naturally spawning objects introduced in the Shipwrecked DLC. They appear as clusters of three oval shadows in the Shallow Ocean 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.
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 Mussels will spawn randomly to replace those consumed. They can also be planted by the player by crafting a Mussel Bed.
The Mussel Bed is a craftable Item introduced in the Shipwrecked DLC. It is found in the Food Tab, requires a Science Machine to prototype, and a Mussel and a Coral to craft. It allows the player to plant new Mussel Beds in the Shallow Ocean.
- The ability to plant new Mussel Beds was added to the Shipwrecked DLC more than a year after its official completion in the Home Sea Home update, after being tested in a beta branch for several months.
- The texture used for underwater Mussels is actually a slightly modified version of the Nightmare Fuel's texture.
- As of the Hang Ten! update, Mussels attached to a Mussel Stick do not perish. The player can use this to their advantage, saving Mussels in the event of food shortages.