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How a sturgeon massage can produce caviar without killing the fish
How a sturgeon massage can produce caviar without killing the fish

Caviar is one of the most prized foods in the world, but it's far from sustainable. German marine biologist Angela Kohler is looking to change that with a new form of sustainable caviar. Kohler has developed a way to extract caviar from a fish without killing it. Most caviar comes from sturgeon, a fish that is typically raised for 10 years or more before it is killed to take its roe. Sturgeon happens to be listed on the International Union for Conservation of Nature's red list of threatened species as the most threatened group of animals.  Kohler has patented a way to massage the eggs out of the sturgeon. First, ultrasound is used to view the eggs. A signaling protein is...

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