I have only heard the term "Sevruga" associated with very expensive Caviar so that would imply that Sevruga could be a Sturgeon.

An expensive Caspian Sea caviar.

Sturgeon

Caviar, the internal ovaries of the sturgeon fish, can be identified by the species of sturgeon that they are obtained from. Therefore the four kinds of caviar are Sterlet, Ossetra, Beluga, and Sevruga.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern --V--GA. That is, seven letter words with 3rd letter V and 6th letter G and 7th letter A. In alphabetical order, they are:

sevruga