The sturgeon is caught alive, a small incision is performed to remove the roe (eggs), the incision is then glued back together, and the fish is released back into the sea. The sturgeon is classified as an endangered species by the International Union for Conservation of Nature. They kill the fish and harvest the roe from any caviar that isn’t beluga.
Oh, my goodness! It’s draining. Picking up a spoonful of eggs from the seashore might take a whole day.
Packets of fish eggs are available. To get a notion, look at pictures of Shad roe preparation on the internet.