Caviar has always been expensive, but now that the methods for harvesting it from fish without killing them the fish become very valuable in their own right, because they are producing the next crop.
The producers have selected the world renowned Trovan microchips for their reliability. They are implanted in the 'shoulder' area, well away from the caviar! This is a different site from where we implant koi.
This means that the caviar produced can be tracked back to the individual fish.