Yes, caviar can be kosher. In order to be considered kosher, caviar must come from a fish that has fins and scales and must be processed in accordance with Jewish dietary laws. The most common type of fish used for kosher caviar is the sturgeon, which is a large, prehistoric fish that is found in the Caspian and Black Sea regions.
To be considered kosher, the sturgeon must be caught and prepared in a specific way. The fish must be killed in a humane manner, and the caviar must be processed under the supervision of a rabbi to ensure that it meets all of the requirements for kosher food. The equipment used to process the caviar must also be cleaned and sterilized according to Jewish dietary laws.
In addition to sturgeon, there are other types of fish that can be used to make kosher caviar, such as salmon, whitefish, and paddlefish. However, the process for preparing these types of caviar may be different from the process used for sturgeon caviar, and they may not be considered as valuable or prestigious as sturgeon caviar.
Overall, whether caviar is kosher or not depends on the specific fish species used to make it and the method of processing. It's always important to check the label or to speak with the manufacturer or retailer to determine if a particular caviar product is kosher.