There’s one type of oyster that’s indigenous to the San Francisco Bay, and that’s the Olympia oyster (Ostrea lurida). It’s named after Olympia, Washington, though these small, tangy oysters can be found up and down the west coast from Alaska all the way down into central Mexico. Olympias — or Olys for short — can still be found in the San Francisco Bay today. But scientists say pollution from agricultural runoff is too high for commercial fishing.