Caviar tag to save Caspian sturgeon

摘要

Farmed sturgeon on special diets could undermine the market for illegal caviar and help save the species from extinction.rnInternational regulations introduced this year mean only caviar from farmed sturgeon can be traded legally. But as there is no way to tell if caviar is farmed or "wild", the new rules offer scant hope for sturgeon in the Caspian Sea, where overfishing has reduced their numbers by 90 per cent in the past two decades. Until recently, the Caspian supplied 90 per cent of the world's caviar.