Store mussels overnight properly to keep them alive. You can extend the life of mussels by storing them properly overnight. The shellfish need to stay alive until you cook them, or they will spoil. ... After you prepare the mussels, they can be stored in an airtight container in the refrigerator or freezer.

How long can you keep fresh mussels in the fridge?

Cover the mussels with a clean damp cloth or paper towel, it's important not to store the shellfish in water. Place into the fridge and store for up to 2 - 5 days (I actually recommend to consume within 2 for best taste, however!) Check on the Mussels daily and drain any build up of water.

Can you leave mussels in water overnight?

Soak in the refrigerator for several hours or overnight, changing the water at least once. Do not use fresh water, it will kill the mussels. ... Mussels will keep for 2 to 3 days, however, they are best when cooked as soon as possible.