According to Everydaylife.globalpost.com, once a jar or tin of fresh caviar is opened, air enters and create the perfect environment for dangerous bacteria to grow and multiply.
If you are serving caviar, keep in mind that perishable foods keep for only two hours unrefrigerated, and one hour if the temperatures in the serving area are 90 F or above, before they need to be discarded. Refrigerated within this time frame, caviar keeps for two to three days, provided the container is resealed and stored in the bottom drawer of the refrigerator, under a bag of ice.
Some caviar can be stored frozen for up to a year, and some others really should never be frozen at all, but should only be kept refrigerated. Caviar should be consumed on the same day that the tin is opened. Whenever possible the caviar should be kept cold over crushed ice.
If the caviar cannot be consumed in the first day, flatten the caviar in the tin and cover with a sheet of plastic wrap. Gently press the plastic wrap down over the caviar to remove air pockets and store in the refrigerator surrounded by crushed ice.
Unopened containers of fresh caviar should also be stored in the refrigerator with crushed ice. Stored in this manner, the caviar should last two to three months. Unopened pasteurized caviar tins typically hold for six months on the shelf. If caviar has been frozen, very slowly return it to a thawed state by keeping it in the refrigerator over ice for a day or two.
If you want to buy some caviar but are a little worried about caviar shelf life, here’s a list of the more popular varieties of caviar with their corresponding shelf life times;
Beluga – 3-4 months
Imperial – 3-4 months
Osetra – 3-4 months
Sevruga – 3-4 months
Atlantic Sturgeon – 3-4 months
White Sturgeon – 3=4 months – delete can be frozen part
Siberian – 3-4 months – delete can be frozen part
Paddlefish – 3 months – delete can be frozen part
Salmon – 2-3 months – put “can be frozen up to 1 year”
Trout – 2-3 months – put can be frozen up to 1 year
Whitefish – 2-3 months – put can be frozen up to 1 year
Note: This list assumes refrigerated storage is at temperatures between 0 Celsius to 2 Celsius. (Most fridges are set at higher temperatures)
Here are some great tips on how to serve caviar and how to store caviar, before and after it is opened featured at Greatpartyrecipes.com.